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[discovery of natural foci of newcastle disease virus in the ussr].in examination of colonial birds in the volga delta in the astrakhan region (188 bioassays from 229 birds) and in the komandorskie islands of the kamchatka region (244 bioassays from 208 birds) in 1974, 15 strains of newcastle disease virus (ndv) were isolated (8 strains from 7 birds and 7 strains from 12 birds, respectively). the strains were isolated from egretta alba and ardea cinerea, and phalacracorax carbo in the astrakhan region and from lunda cirrhata and uria aalge in the komandorskie i ...1977906443
mercury in eggs of aquatic birds, lake st. clair--1973.eggs from four species of aquatic birds inhabiting waterways of the lake st. clair region were collected in 1973 and analyzed for mercury. species analyzed were mallard ducks (anas platyrhynchos), common terns (sterna hirundo), black-crowned night herons (nycticorax nycticorax), and great egrets (casmerodius albus). mallard eggs contained relatively low residue levels, less than 0.05-0.26 ppm, and common tern eggs contained the highest residues, ranging up to 1.31 ppm. mercury levels in the eggs ...1976940735
viremia in young herons and ibis infected with venezuelan encephalitis virus.fifty-seven of 61 nestling, 8- to 30-day-old herons of three species (black-crowned night heron, great egret, and snowy egret), developed viremia lasting one to three days following subcutaneous inoculation with small doses of endemic or epidemic strains of venezuelan encephalitis virus from mexico, guatemala or venezuela. two epidemic strains from guatemala or venezuela stimulated levels of viremia similar to those following infection with enzootic strains. great egrets, striated and boat-bille ...1976998614
primary immunoglobulin response of herons to infection with venezuelan encephalitis virus.seven to nine days after inoculation with a replicating antigen, venezuelan encephalitis virus, hemagglutination-inhibiting antibodies were present in plasma of 18 to 20 black-crowned night herons (bcnh), 14 of 15 great egrets (ge) , and 7 of 7 snowy egrets (se). 19s (immunoglobulin m) precedes 7s (immunoglobulin g) antibodies in all but one bird of six ge, six se, and six bcnh. 19s antibodies were detected for only 2 to 4 weeks post-inoculation. the induction period for both types of antibody w ...19751112617
[trematode infections in the small intestine of egretta alba modesta in kangwon-do].we surveyed 12 migrating large egrets, egretta alba modesta, for their infection status with intestinal trematodes, from june to september, 1990. all of them were infected with one or more flukes. total 5 species were identified. their infection rates and total numbers of worms were metagonimus sp. 67% and 1,412, centrocestus armatus 67% and 2,306, echinochasmus japonicus 50% and 99, strigea falconis 83% and 635, and a diplostomid fluke 33% and 36. the number of worms in a bird was in the range ...19911786249
brain cholinesterase activity of nestling great egrets, snowy egrets and black-crowned night-herons.inhibition of brain cholinesterase (che) activity in birds is often used to diagnose exposure or death from organophosphorus or carbamate pesticides. brain che activity in the young of altricial species increases with age; however, this relationship has only been demonstrated in the european starling (sturnus vulgaris). brain che activity of nestling great egrets (casmerodius albus) collected from a colony in texas (usa) increased significantly with age and did not differ among individuals from ...19892761008
eustrongylides sp. epizootic in young common egrets (casmerodius albus).in may 1985, epizootic mortality was reported in common egrets (casmerodius albus) on avery island, louisiana. subsequent investigation revealed that more than 400 birds died. severe peritoneal nematodiasis (eustrongylides sp.) was found on postmortem examination. a nearby breeding rookery on the same island was apparently unaffected. reasons for this selective mortality are presented. three other reports of epizootic mortality due to eustrongylides sp. have been reported. this is the first repo ...19883382371
distribution of heavy metals and their age-related changes in the eastern great white egret, egretta alba modesta, in korea. 19863707203
heavy metal distribution in organs and tissues of the eastern great white egret egretta alba modesta. 19854074945
experimental infection of contracaecum multipapillatum (nematoda: anisakinae) from mexico in the domestic cat.juveniles of contracaecum multipapillatum infected the mayan cichlid (cichlasoma urophthalmus) and adults infected the olivaceous cormorant (phalacrocorax olivaceus) and the great egret (casmerodius albus) in the coastal lagoon at celestun, state of yucatan, mexico. all are new host records, and, even though the geographic locality record of mexico for the species has not been published, unidentified but presumably conspecific specimens have been reported from there. when juveniles of c. multipa ...19948064526
[the relationship between mosquito vectors and aquatic birds in the potential transmission of 2 arboviruses].the authors studied for two years the role of the chicks of aquatic birds in the arboviral cycles in coastal lagoons in central panama in order to determine the relation between culex (melanoconion) ocossa and mansonia (mansonia) dyari mosquitoes in the transmission and dissemination of the viruses of saint louis encephalitis (sle) and venezuelan equine encephalitis (vee). mosquitoes were captured every fifteen days on two consecutive nights to isolate the virus, using light traps (cdc) and bait ...19938101009
sarcocystis sp. in wading birds (ciconiiformes) from florida.sarcocysts were found in striated muscle of 21 adult wading birds among 145 examined grossly and 70 examined histologically (calculated prevalence = 24%), and in none of 332 immature wading birds examined from florida (usa). six of 12 species of ciconiforms were infected (ardea herodias, casmerodius albus, egretta caerulea, nyctanassa violacea, butorides striatus, eudocimus albus). cysts were filamentous, usually extended the entire length of the muscle fiber, and were visible grossly in 33% of ...19948151820
heavy metal and selenium levels in feathers of young egrets and herons from hong kong and szechuan, china.several species of herons and egrets frequently nest in colonies in areas where humans also concentrate. since the birds feed on intermediate-sized fish that themselves concentrate pollutants, they can be used not only to assess the levels of contaminants in avian tissues but as indicators of contaminants in the environment. the concentration of heavy metals and selenium in the breast feathers of fledgling black-crowned night herons nycticorax nycticorax and chinese pond herons ardeola bacchus f ...19938215588
the epizootiology of eustrongylidosis in wading birds (ciconiiformes) in florida.a total of 2,167 individuals representing 15 species of wading birds was examined for infection with the nematode eustrongylides ignotus in florida (usa). ten of the species were infected with the greatest prevalences occurring in great blue herons (ardea herodius) (33%), great egrets (casmerodius albus) (22%), and snowy egrets (egretta thula) (19%). among nestlings, prevalences increased with age. this parasite was estimated to cause at least 80% mortality among nestling ciconiiforms at one col ...19938487373
pathogenesis of eustrongylides ignotus (nematoda: dioctophymatoidea) in ciconiiformes.natural (n = 157) and experimental (n = 5) infections with the nematode eustrongylides ignotus are described for ciconiforms collected in florida (usa). larvae perforated the ventriculus in 3 to 5 hr and caused hemorrhage and bacterial peritonitis that sometimes progressed to a fibrous peritonitis with extensive adhesions. severity of the disease was related inversely to the age of the bird and directly to the number of parasites involved. some infections in adult birds were resolved. as a conse ...19938487374
carbofuran poisoning in herons: diagnosis using cholinesterase reactivation techniques.exposure to the carbamate insecticide carbofuran was detected using brain cholinesterase (che) reactivation techniques in heron carcasses collected from a potential pesticide exposure incident. great egrets (nycticorax nycticorax), great blue herons (ardea herodias), and black-crowned night herons (casmerodius albus) were exposed to carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate) either by dermal exposure while wading or through ingestion of contaminated food items. carcasse ...19958583636
ascocotyle (a.) nunezae n. sp. (digenea: heterophyidae) from yucatan, mexico.a new heterophyid species, ascocotyle (ascocotyle) nunezae n. sp., is described from adults found in the intestine of naturally infected heron, casmerodius albus (type host), from the coastal lagoon of celestún. yucatan, mexico, and a domestic chick (gallus gallus), experimentally infected with metacercariae from cichlasoma octofasciatum. the new species is characterized mainly by the number (32-37) and arrangement of circumoral spines, which form i complete row of 25-27 circumoral spines and 6- ...19979057711
risk, mercury levels, and birds: relating adverse laboratory effects to field biomonitoring.there is an abundance of field data on levels of mercury in a variety of organisms and there are a number of studies that demonstrate the adverse effects of mercury on laboratory animals, but few studies examine the relationship between the two. thus it is often difficult to determine the ecological relevance of mercury concentrations found in nature, or to predict the ecosystem consequences of current levels. in this paper we review the levels in tissues that are associated with adverse effects ...19979417847
effects of mercury on health and first-year survival of free-ranging great egrets (ardea albus) from southern florida.the objectives of this study were to determine whether elevated mercury (hg) concentrations have a negative impact on the health and survival of nestling and juvenile free-ranging great egrets (ardea albus) from southern florida. during 1994, when health and survival was monitored in a cohort of young birds with naturally variable concentrations of hg, packed cell volume was positively correlated with blood hg concentrations, and high hg concentration in blood was not related to the probability ...199910473794
methylmercury accumulation in tissues and its effects on growth and appetite in captive great egrets.to test the hypothesis that fledging wading birds would be more at risk from mercury toxicosis than younger nestlings, captive great egret nestlings were maintained as controls or were dosed from 1- to 14-wk-old with 0.5 or 5 mg methylmercury chloride/kg wet weight in fish. birds dosed with 5 mg/kg suffered from subacute toxicosis at wk 10-12. growing feather concentrations were the most closely correlated with cumulative mercury consumed per weight. blood concentrations of mercury increased mor ...200010941725
histologic, neurologic, and immunologic effects of methylmercury in captive great egrets.captive great egret (ardea albus) nestlings were maintained as controls or were dosed with methylmercury chloride at low (0.5), and high doses (5 mg/kg, wet weight) in fish. low dosed birds were given methylmercury at concentrations comparable to current exposure of wild birds in the everglades (florida, usa). when compared with controls, low dosed birds had lower packed cell volumes, dingy feathers, increased lymphocytic cuffing in a skin test, increased bone marrow cellularity, decreased bursa ...200010941726
contracaecum multipapillatum (nematoda: anisakidae) from egretta alba (aves: ardeidae) and comments on other species of this genus in argentina.during a parasitological survey of aquatic birds in mar chiquita coastal lagoon (buenos aires province, argentina), specimens of contracaecum raillet & henry, 1912 sp. were found in the esophagus and stomach of the great egret egretta alba (gmelin, 1789) (aves: ardeidae). the nematodes were identified as contracaecum multipapillatum (drasche, 1882) on the basis of the following features: ratio of ventricular appendage length to esophagus length, ratio of intestinal caecum length to esophagus len ...200010958460
chlorinated hydrocarbons and biomarkers of exposure in wading birds and fish of the lower rio grande valley, texas.during 1997 we evaluated reproductive success in colonial water birds nesting in the lower rio grande valley (lrgv), texas, and correlated success with concentrations of contaminants in eggs. we also measured steroid hormones and gonadosomatic index (gsi) as biomarkers of endocrine effects in common carp (cyprinus carpio). nest and fledging success of green herons (butorides virescens) and great egrets (ardea alba) were similar to those found in other parts of north america; however, nesting suc ...200111116345
a screening level probabilistic risk assessment of mercury in florida everglades food webs.a screening level probabilistic assessment of risks was performed on three species of piscivorous wildlife at the top of everglades aquatic food webs: the american alligator (alligator mississippiensis), the great egret (egretta alba), and the raccoon (procyon lotor varius). ranges of dietary exposure concentrations (and probability distribution functions) were derived for two general areas of the everglades: shark slough and the southcentral everglades (highly contaminated with hg), and the nor ...200011139184
persistent organochlorine pollutants in eggs of colonial waterbirds from galveston bay and east texas, usa.eggs of neotropic cormorants (phalacrocorax brasilianus), black-crowned night herons (nycticorax nycticorax), and great egrets (ardea alba) nesting on several locations in galveston bay (tx, usa) and at two control sites outside the bay were collected during april-may 1996 and analyzed for chlorinated pesticides, pcbs, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans. additionally, concentrations of 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (tcdd-eqs) were determined by ...200111349863
mercury in eggs and feathers of great egrets (ardea albus) from the florida everglades.great egret (ardea albus) eggs and nestling feathers were collected for total mercury (thg) and methylmercury (mehg) analysis from two colonies in the florida everglades in 1999 and 2000. thg was present in all eggs at a mean concentration of 0.39 +/- 0.19 microg/g fresh weight (n = 33, range = 0.08-0.86 microg/g). egg-thg levels did not differ significantly between colonies or years. mehg concentration in eggs was 0.35 +/- 0.18 microg/g fresh weight (n = 20, range = 0.05-0.82 microg/g,), and on ...200111598788
wading birds as bioindicators of mercury contamination in florida, usa: annual and geographic variation.mercury contamination in wetland biota is often dynamic, difficult to predict, and costly to track. in this paper, we present results from a six-year study of growing feathers of piscivorous birds as monitors of wetland hg exposure in florida, usa, wetlands. between 1994 and 2000, we collected feathers of growing great egret (ardea alba) nestlings from colonies in the freshwater everglades of southern florida, and during 1998, feathers were collected from chicks of both great egrets and white ib ...200211804050
morphology of gnathostoma spp. isolated from natural hosts in sinaloa, mexico.gnathostomosis is an emerging public health problem in sinaloa, mexico, where an increasing number of human cases have been diagnosed since 1989. the present study was carried out to determine the presence of the parasite in other natural hosts from the area. birds, fish, opossums and raccoons were captured from local dams and lagoons. the flesh from bird and fish specimens was ground and examined under a 100 w light bulb. larvae were processed for light and electron microscopy. a total of 368 a ...200212107456
cestodes of the family dilepididae (cestoda:cyclophyllidea) from fish-eating birds in mexico: a survey of species.a survey of adults of dilepidid tapeworms (cyclophyllidea) from piscivorous birds from mexico is presented on the basis of the taxonomic evaluation of freshly collected and voucher specimens. the following species are reported (first records from mexico marked with an asterisk): cyclustera capito (rudolphi, 1819); *c. ibisae (schmidt & bush, 1972); *dendrouterina ardeae rausch, 1955; *d. herodiae fuhrmann, 1912; *d. papillifera (fuhrmann, 1908); glossocercus auritus (rudolphi, 1819); *neogryporh ...200212143788
the life cycle of clinostomum complanatum rudolphi, 1814 (digenea, clinostomidae) on the floodplain of the high paraná river, brazil.the life cycle of the digenetic trematode clinostomum complanatum was studied on the floodplain of the high paraná river, brazil. sampling was done between june 1999 and june 2000. the mollusc biomphalaria peregrina was the first intermediate host with a prevalence of infection of 0.75%. the fish loricariichthys platymetopon, hoplosternum littorale, parauchenipterus galeatus, hoplias malabaricus and loricaria sp. were second intermediate hosts, with the prevalence varying from 2.45% ( h. malabar ...200312658465
[study on the trematode parasites of the birds in korea]authors carried out an investigation of the helminthic parasites of the wild birds in korea. most wild birds were collected from kyoung sang do, kyoung kee do and seoul area from september 1970 to march 1973. a total of 70 wild birds, 19 species were examined, which comprised as follows; 10 anas platyrhynchus, 10 anas fulicata, 4 anas poeciolorhyncha zonorhyncha, 8 anser albifrone albifrone, 5 anser cygonopsis cygnoid, 10 aythya fuligula, 6 gallicrex cinerea, 2 porgana fusca, 2 phisianum calichi ...197312913486
natural infection of a great egret (casmerodius albus) with eastern equine encephalitis virus.in july 2001, a great egret (casmerodius albus) was found dead in charlton county, georgia (usa) and submitted to the southeastern cooperative wildlife disease study (the university of georgia, athens, georgia). histopathologic findings included severe hepatic necrosis and necrosis of sheathed arterioles. eastern equine encephalitis (eee) virus was isolated from brain and heart using vero cells and was identified using a standard micro-neutralization test and reverse transcription polymerase cha ...200314567234
organochlorine contamination in bird's eggs from the danube delta.in this study we report the levels of organochlorine compounds in eggs of aquatic birds from the danube delta, a major european wetland. the eggs were collected in 1997 and belonged to the following species: the mallard (anas platyrhynchos), the greylag goose (anser anser), the mute swan (cygnus olor), the coot (fulica atra), the glossy ibis (plegadis falcinellus), the spoonbill (platalea leucorodia), the little egret (egretta garzetta), the night heron (nycticorax nycticorax), the grey heron (a ...200015092913
a historical record of mercury contamination in southern florida (usa) as inferred from avian feather tissue.during the late 1980s, the upper trophic-level biota of the everglades (fl, usa) was recognized as being highly contaminated with mercury (hg). however, the timing and pattern of that increase is poorly known, and no information is available about mercury contamination in everglades wildlife prior to 1974. we measured methylmercury concentrations in feathers of white ibises (n = 33), great egrets (n = 7), anhingas (n = 21), and great blue herons (n = 12) from museum specimens collected from 1910 ...200415376533
first report of adult specimens of sphincterodiplostomum musculosum (digenea, diplostomidae).sphincterodiplostomum musculosum dubois, 1936 (diplostomidae, diplostominae) was originally described on the basis of specimens collected from the intestine of agami heron, agamia agami (gmelin) (ardeidae), in mato grosso, brazil. the original description of this species was brief because it was based on a few immature specimens. the purpose of this paper is to describe the detailed morphological study of several adult specimens of s. musculosum obtained from the intestine of the great egret, ar ...200616126453
nesting ardeid colonies are not a focus of elevated west nile virus activity in southern california.a large nesting colony of ardeid birds at the finney-ramer wildlife refuge in imperial county, california, did not appear to be a focus of west nile virus (wnv) amplification during the summer of 2004. blood samples taken during june and july from 155 nestlings of four species of ardeid birds (cattle egrets, black-crowned night herons, great egrets, and snowy egrets) and five nestling double-crested cormorants yielded a single wnv isolation from a 3-week-old cattle egret. antibody was detected b ...200516187895
subchronic effects of methylmercury on plasma and organ biochemistries in great egret nestlings.in recent years, high concentrations of mercury have been found in wading birds in florida, usa. great egret (ardea alba) chicks (2 weeks old) were dosed orally daily with the equivalent of 0, 0.5, or 5 microg/g hg as methylmercury chloride in the diet for up to 12 weeks. weakness of the legs or paralysis occurred in all high-dosed birds. geometric mean blood hg concentrations were 0.17, 10.3, and 78.5 microg/g (wet wt), respectively. mercury concentrations for organs (microg/g wet wt), includin ...200516445088
avian tuberculosis in naturally infected captive water birds of the ardeideae and threskiornithidae families studied by serotyping, is901 rflp typing, and virulence for poultry.avian tuberculosis was detected in one flock of 38 water birds of the families ardeideae (n = 20) and threskiornithidae (n = 18). mycobacterium avium subsp. avium (maa, serotype 1, genotype is901+ and is1245+) was more often (p = 0.01) detected in tissue and/or faecal samples in 18 (90.0%) birds form the ardeideae family: little egret (egretta garzetta), buff-backed heron (bubulcus ibis), great white egret (egretta alba), and bittern (botaurus stellaris) in comparison to two (11.1%) birds from t ...200717056210
polychlorinated dibenzo-p-dioxins and dibenzofurans in eggs of eight avian species from dongting lake, china.concentrations of polychlorinated dibenzo-p-dioxins (pcdds) and dibenzofurans (pcdfs) were determined in eggs of eight avian species collected from dongting lake of china to assess residue levels, accumulation patterns, and toxic potential in different avian species. concentrations of total 2,3,7,8-substituted pcdd/fs were in the range of 10.8-182pgg(-1) lipid weight. eggs of great egret and lesser pied kingfisher contained higher levels of pcdd/fs than eggs of other species, indicating the spec ...200717582463
a case of chondrosarcoma in a free-flying great egret.a free-flying great egret (ardea alba) captured in gifu, central japan, in may 2006 had a large mass on the right carpal joint. the tumor was diagnosed as chondrosarcoma by histopathologic examination.200717699097
siblicidal aggression and resource monopolization in birds.in texas, great egret casmerodius albus chicks attack younger nestmates, often fatally (siblicide). by contrast, the young of neighboring great blue herons ardea herodias seldom strike or kill siblings. these interspecific differences seem related to prey size: only fish provided by egret parents are small enough for chicks to monopolize (a process facilitated by aggression). experimentally cross-fostered heron chicks raised on small prey by egret parents became siblicidal, but the reverse proce ...198417810292
[complex environmental and virological monitoring in the primorye territory in 2003-2006].the paper presents the results of monitoring of viruses of western nile (wn), japanese encephalitis (je), tick-borne encephalitis (tbe), geta, influenza a, as well as avian paramicroviruses type i (virus of newcastle disease (nd)) and type 6 (apmv-6) in the primorye territory in 2003-2006. totally throughout the period, specific antibodies to the viruses were detected by neutralization test in wild birds (7.3%, wn; 8.0%, geta; 0.7% batai; 2.8%, alpine hare (lepus timidus); by hemagglutination-in ...200718041224
species differences in the sensitivity of avian embryos to methylmercury.we injected doses of methylmercury into the air cells of eggs of 26 species of birds and examined the dose-response curves of embryo survival. for 23 species we had adequate data to calculate the median lethal concentration (lc(50)). based on the dose-response curves and lc(50)s, we ranked species according to their sensitivity to injected methylmercury. although the previously published embryotoxic threshold of mercury in game farm mallards (anas platyrhynchos) has been used as a default value ...200918421496
waterbirds (other than laridae) nesting in the middle section of laguna cuyutlán, colima, méxico.laguna de cuyutlán, in the state of colima, mexico, is the only large coastal wetland in a span of roughly 1150 km. despite this, the study of its birds has been largely neglected. between 2003 and 2006 we assessed the waterbirds nesting in the middle portion of laguna cuyutlán, a large tropical coastal lagoon, through field visits. we documented the nesting of 15 species of non-laridae waterbirds: neotropic cormorant (phalacrocorax brasilianus), tricolored egret (egretta tricolor), snowy egret ...200818624252
ecological risk of methylmercury in everglades national park, florida, usa.dramatic declines in mercury levels have been reported in everglades biota in recent years. yet, methylmercury (mehg) hot spots remain. this paper summarizes a risk assessment of mehg exposure to three piscivorous wildlife species (bald eagle, haliaeetus leucocephalus; wood stork, mycteria americana; and great egret, ardea albus) foraging at a mehg hot spot in northern everglades national park (enp). available data consisted of literature-derived life history parameters and tissue concentrations ...200818679795
[interpretation of the epizootic outbreak among wild and domestic birds in the south of the european part of russia in december 2007].the paper presents the results of interpreting the epizootic outbreak etiologically associated with high-virulent influenza virus a/h5n1 among domestic and wild birds in the zernogradsky and tselinsky districts of the rostov region. epizooty was characterized by a high infection rate in the synanthropic birds of a ground-based complex. rt-pct revealed influenza virus a/h5 in 60% of pigeons and crows and in around 20% of starlings, and in 10% of tree sparrows. fifteen viral strains from chickens ...200818756811
avian leucosis (lymphoid) in an egret (egretta alba). 197218777374
perfluorooctane sulfonate and other fluorochemicals in waterbird eggs from south china.to our knowledge, this is the first study reporting concentrations of perfluorinated compounds (pfcs) in waterbird eggs in south china. concentrations of 11 pfcs (pfos, pfhxs, pfbs, pfosa, pfdoda, pfunda, pfda, pfna, pfoa, pfhpa, pfhxa) were measured in night heron, great egret, and little egret eggs from south china (hong kong, xiamen, quanzhou). pfos was found to be the dominant pfc in the waterbird eggs. total concentrations of the 11 pfcs in waterbird eggs ranged from 27.0 ng/g ww (great egr ...200819031916
feather mercury concentrations and physiological condition of great egret and white ibis nestlings in the florida everglades.mercury contamination in the florida everglades has reportedly played a role in the recent decline of wading birds, although no studies have identified a mechanism leading to population-level effects. we assessed feather mercury levels in great egret (ardea alba; n=91) and white ibis (eudocimus albus; n=46) nestlings at breeding colonies in the florida everglades during a year (2006) with excellent breeding conditions (characterized by hydrology leading to concentrated prey) and a year with belo ...200919217646
experimental bolbophorus damnificus (digenea: bolbophoridae) infections in piscivorous birds.in order to determine potential definitive hosts of the digenetic trematode, bolbophorus damnificus, two american white pelicans (pelecanus erythrorhynchos), two double-crested cormorants (phalacrocorax auritus), two great blue herons (ardea herodias), and two great egrets (ardea alba) were captured, treated with praziquantel, and fed channel catfish (ictalurus punctatus) infected with b. damnificus metacercariae. patent infections of b. damnificus, which developed in both american white pelican ...200919617478
contracaecum gibsoni n. sp. and c. overstreeti n. sp. (nematoda: anisakidae) from the dalmatian pelican pelecanus crispus (l.) in greek waters: genetic and morphological evidence.two new species of contracaecum railliet & henry, 1912, previously referred to as c. multipapillatum sp. a and c. multipapillatum sp. b by nascetti et al. (1990) from the dalmatian pelican pelecanus crispus (l.) in the ambracian gulf off greece, are described as c. gibsoni n. sp. and c. overstreeti n. sp., respectively. morphological analysis and the differential diagnosis of genetically recognised male specimens of c. gibsoni and c. overstreeti with respect to c. multipapillatum (von drasche, 1 ...201020157795
investigation of great egret (casmerodius albus) breeding success in hara biosphere reserve of iran.study of great egret breeding success was carried out for the first time in hara biosphere reserve of iran. since great egret is considered as wading bird as well as wetland-dependent species which is located on top of the food chain in this ecosystem, its breeding study is an appropriate means for evaluating food supply fluctuations and environmental threatening factors by comparison of different years. on the other hand, great egret is considered a suitable indicator to examination of biologic ...201021049287
chewing lice (phthiraptera) species on wild birds in cappadocia region, turkey.objective: this study was performed on 70 injured wild birds belonging to 7 different species in the cappadocia region between 2005 and 2009. all birds were inspected for ectoparasites and 29 of 70 (41.4%) birds were found to be infested by at least one chewing louse species. methods: all lice were cleared in 10% koh, mounted in canada balsam on slides and identified under a light microscope. results: the lice were identified as laemobothrion maximum, craspedorrhynchus platystomus, degeeriella f ...201021391187
new primers for sex identification in the chinese egret and other ardeid species.using the universal p2/p8 primers, we were able to obtain the gene segments of chromo-helicase-dna binding protein (chd)-z and chd-w from ten species of ardeid birds including chinese egret (egretta eulophotes), little egret (e. garzetta), eastern reef egret (e. sacra), great egret (ardea alba), grey heron (a. cinerea), chinese pond-heron (ardeola bacchus), cattle egret (bubulcus ibis), black-crowned night-heron (nycticorax nycticorax), cinnamon bittern (ixobrychus cinnamomeus) and yellow bitter ...201121429119
polychlorinated biphenyls and organochlorine pesticides in local waterbird eggs from hong kong: risk assessment to local waterbirds.the contamination status of the marine environment in hong kong was studied by measuring concentrations of organochlorine (oc) pollutants (i.e., hexachlorobenzene, aldrin, dieldrin, endrin, mirex, total heptachlor, total chlordane, total ddts, total pcbs, and total toxaphenes) in the eggs of selected waterbird species from different locations around the city: little egret (egretta garzetta) and chinese pond heron (ardeola bacchus) from mai po village, great egret (ardea alba) and black-crowned n ...201121440927
use of the superpopulation approach to estimate breeding population size: an example in asynchronously breeding birds.many populations of animals are fluid in both space and time, making estimation of numbers difficult. much attention has been devoted to estimation of bias in detection of animals that are present at the time of survey. however, an equally important problem is estimation of population size when all animals are not present on all survey occasions. here, we showcase use of the superpopulation approach to capture-recapture modeling for estimating populations where group membership is asynchronous, ...201121661545
[postnatal growth patterns in eight species of herons and egrets (ciconiiformes: ardeidae)].avian postnatal growth has received considerable attention and its ecological implications have been deeply analyzed. in this current paper, i describe the patterns of culmen and tarsus growth, as well as of weight gain patterns in eight species of herons and egrets (aves: ardeidae) found in the birama swamp in eastern cuba. between 1998 and 2006,714 nestlings of the following species were measured every two days: butorides virescens, bubulcus ibis, egretta thula, e. tricolor, e. caerulea, e. ru ...201121721238
reconstructing genetic mating systems in the absence of parental information in colonially breeding waterbirds.dna-based studies have demonstrated that avian genetic mating systems vary widely, with many species deviating from long-assumed monogamy by practicing extra-pair paternity and conspecific brood parasitism. colonially breeding waterbirds provide interesting models in which to investigate this question because they show nesting habits proposed to promote alternative reproductive strategies. however, little is known about the genetic mating systems of this group of birds, mainly due to difficultie ...201121740559
polychlorinated dibenzo-p-dioxins (pcdds), polychlorinated dibenzofurans (pcdfs), dioxin-like polychlorinated biphenyls (pcbs) and polybrominated diphenyl ethers (pbdes) in waterbird eggs of hong kong, china.concentrations of pcdd/fs, pcbs and pbdes were measured in 56 egg samples collected from waterbirds of different species (great egret, little egret, night heron and chinese pond heron) from different regions of hong kong (ho sheung heung, mai po village and mai po lung village) during 2000 and 2006. dominance of 2,3,4,7,8-pecdf indicates a signature associated with commercial usage of pcbs. although no significant variations were observed within- and between-site in the levels of pcdd/fs, coplan ...201222024097
helminth communities of two species of piscivorous birds, ardea alba (linnaeus) and nyctanassa violacea (gmelin) (ciconiiformes: ardeidae), in two coastal lagoons from guerrero state, mexico.the composition and species richness in helminth communities of two species of heron, ardea alba and nyctanassa violacea, in two coastal lagoons from guerrero, mexico were examined. nineteen species of helminth (7,804 individuals) were identified in 43 adult birds: 15 digeneans, 1 acanthocephalan, 1 cestode, and 2 nematodes. eight species co-occurred in herons of both species and lagoons. the prevalence values of seven species and the mean abundance of five species varied significantly between s ...201222314783
surveillance of avian influenza viruses in migratory birds in egypt, 2003-09.migratory (particularly aquatic) birds are the major natural reservoirs for type a influenza viruses. however, their role in transmitting highly pathogenic avian influenza (hpai) viruses is unclear. egypt is a "funnel" zone of wild bird migration pathways from central asia and europe to eastern and central africa ending in south africa. we sought to detect and isolate avian influenza viruses in migratory birds in egypt. during september 2003-february 2009, the us naval medical research unit numb ...201222740532
host preference of the arbovirus vector culex erraticus (diptera: culicidae) at sonso lake, cauca valley department, colombia.culex erraticus (dyar & knab) is a competent vector of eastern equine encephalitis virus and subtype ic venezuelan equine encephalitis virus, and both st. louis encephalitis virus and west nile virus have been isolated from field-collected specimens. previous bloodmeal analysis studies have shown this species to be a generalist, feeding on a variety of mammals, birds, reptiles, and amphibians. this behavior can bridge arboviral transmission across different vertebrate groups. our study examined ...201223025191
temporal trends (1989-2011) in levels of mercury and other heavy metals in feathers of fledgling great egrets nesting in barnegat bay, nj.there is an abundance of data for levels of metals from a range of species, but relatively few long-term time series from the same location. in this paper i examine the levels of arsenic, cadmium, chromium, lead, manganese, mercury and selenium in feathers from fledgling great egrets (ardea alba) collected at nesting colonies in barnegat bay, new jersey from 1989 to 2011. the primary objectives were to test the null hypotheses that (1) there were no temporal differences in metal levels in feathe ...201323434313
landscape factors and hydrology influence mercury concentrations in wading birds breeding in the florida everglades, usa.the hydrology of wetland ecosystems is a key driver of both mercury (hg) methylation and waterbird foraging ecology, and hence may play a fundamental role in waterbird exposure and risk to hg contamination. however, few studies have investigated hydrological factors that influence waterbird hg exposure. we examined how several landscape-level hydrological variables influenced hg concentrations in great egret and white ibis adults and chicks in the florida everglades. the great egret is a visual ...201323707869
pathogenicity of clinostomum complanatum (digenea: clinostomidae) in piscivorous birds.the present study is focused on the pathogenicity of a parasitic digenea, clinostomum complanatum among dead piscivorous birds, collected after mass mortalities in northern iran. a total of 126 birds (15 species) were examined for parasitic infections. birds of four species belong to the family ardeidae were found to be infected with immature and mature worms. c. complanatum was more prevalent in ardea purpurea followed by nycticorax nycticorax, egretta alba and egretta garzetta. pathological st ...201323876333
large scale mortality of nestling ardeids caused by nematode infection.during the summer of 1976, an epornitic of verminous peritonitis caused by eustrongylides ignotus resulted in large scale mortality of young herons and egrets on pea patch island, delaware. mortality was highest (84%) in snowy egret nestlings ( egretta thula ) and less severe in great egrets ( casmerodius albus ), louisiana herons ( hydranassa tricolor ), little blue herons ( florida caerulea ), and black crowned night herons ( nycticorax nycticorax ). most deaths occured within the first 4 week ...197724228957
organochlorines and selenium in california night-heron and egret eggs.exceptionally high concentrations of dde were found in black-crowned night-heron (nycticorax nycticorax) (geometric mean 8.62 μg g(-1) wet wt.) and great egret (casmerodius albus) (24.0 μg g(-1)) eggs collected from the imperial valley (salton sea), california in 1985. dde concentrations in 14 of the 87 (16%) randomly selected night-heron eggs from six colonies (two in san francisco bay, three in the san joaquin valley, and one at salton sea) were higher than those associated with reduced reprod ...199024243431
microhabitat use by three species of egret (pelecaniformes, ardeidae) in southern brazil.in the present study, we examined the role of different habitat components and their relationship with microhabitat use by three species of egret: cocoi heron (ardea cocoi), great egret (ardea alba), and cattle egret (bubulcus ibis), in wetlands of southern brazil. ardea alba and a. cocoi were not habitat-specific (e.g. vegetation cover and flooding level). conversely, b. ibis was associated with drier microhabitats. relative air humidity and air temperature were the main variables which correla ...201324789395
physiological condition of juvenile wading birds in relation to multiple landscape stressors in the florida everglades: effects of hydrology, prey availability, and mercury bioaccumulation.the physiological condition of juvenile birds can be influenced by multiple ecological stressors, and few studies have concurrently considered the effects of environmental contaminants in combination with ecological attributes that can influence foraging conditions and prey availability. using three temporally distinct indices of physiological condition, we compared the physiological response of nestling great egrets (ardea alba) and white ibises (eudocimus albus) to changing prey availability, ...201425184221
metal levels in eggs of waterbirds in the new york harbor (usa): trophic relationships and possible risk to human consumers.health professionals are interested in evaluating the risks that heavy metals pose to eco-receptors and humans. the objective of this study was to examine levels of mercury (hg), lead (pb), cadmium (cd), and other contaminants in waterbirds nesting in the new york harbor in 2012 to determine (1) whether there were species and locational differences, and (2) whether consumption of eggs posed a health risk to predators or humans. for arsenic (as), pb, hg, and selenium (se), species contributed mor ...201525424617
composition, structure and pattern of helminth assemblages associated with central european herons (ardeidae).helminths parasitizing the ardeid birds are poorly understood, and the majority of studies are limited to checklists and records of novel host-parasite interactions. here we analyzed the prevalence, intensity and diversity of the helminth component communities associated with an extensive cohort of the five most common czech herons (ardea cinerea, ardea alba, nycticorax nycticorax, botaurus stellaris and ixobrychus minutus) collected in the years 1962-2013. comparison with ukrainian datasets sup ...201525449288
potential for great egrets (ardea alba) to transmit a virulent strain of aeromonas hydrophila among channel catfish (ictalurus punctatus) culture ponds.aeromonas hydrophila is a gram-negative, rod-shaped, facultative, anaerobic bacterium that is ubiquitous in freshwater and slightly brackish aquatic environments and infects fish, humans, reptiles, and birds. recent severe outbreaks of disease in commercial channel catfish (ictalurus punctatus) aquaculture ponds have been associated with a highly virulent a. hydrophila strain (vah), which is genetically distinct from less-virulent strains. the epidemiology of this disease has not been determined ...201525984772
linking dynamic habitat selection with wading bird foraging distributions across resource gradients.species distribution models (sdm) link species occurrence with a suite of environmental predictors and provide an estimate of habitat quality when the variable set captures the biological requirements of the species. sdms are inherently more complex when they include components of a species' ecology such as conspecific attraction and behavioral flexibility to exploit resources that vary across time and space. wading birds are highly mobile, demonstrate flexible habitat selection, and respond qui ...201526107386
completion of the life cycle of tylodelphys mashonense (sudarikov, 1971) (digenea: diplostomidae) with dna barcodes and rdna sequences.the life cycle of tylodelphys mashonense (digenea: diplostomidae), whose metacercariae occur in the cranial cavity of the widely cultivated catfish clarias gariepinus, was resolved by the application of molecular markers. both coi barcodes and its sequences obtained from diplostomid-like cercariae infecting bulinus spp. from mindu dam, morogoro, matched those acquired from metacercariae from the catfish c. gariepinus, and those from adult t. mashonense from the grey heron ardea cinerea and the w ...201526122993
mercury concentrations in birds from two atmospherically contaminated sites in north texas, usa.mercury (hg) is a ubiquitous and highly toxic contaminant that can have negative effects on wildlife. only a few studies have measured hg concentrations in birds from the south central united states, and the potential threat of hg contamination to birds in this region is largely unknown. in the present study, we assess hg concentrations in blood and feathers from five bird species [eastern bluebird (sialis sialis), carolina wren (thryothorus ludovicianus), wood duck (aix sponsa), great egret (ar ...201526137900
[egg size variation in egrets and herons (aves: ardeidae) nesting in birama's swamp, cuba].intraclutch egg size variation in birds depends on many ecological factors and on the evolutive history of each species. in wading birds, a trend to smaller eggs with laying order has been described, but comparative reports are scarce. in this study, egg size variation patterns were described for nine egrets and heron species nesting in birama' swamp, cuba. the patterns were described using external dimensions of 3142 eggs from 1875 nests of butorides virescens, bubulcus ibis, ardea alba, nyctic ...201526299128
determining habitat quality for species that demonstrate dynamic habitat selection.determining habitat quality for wildlife populations requires relating a species' habitat to its survival and reproduction. within a season, species occurrence and density can be disconnected from measures of habitat quality when resources are highly seasonal, unpredictable over time, and patchy. here we establish an explicit link among dynamic selection of changing resources, spatio-temporal species distributions, and fitness for predictive abundance and occurrence models that are used for shor ...201527069617
dna barcoding and phylogenetic relationships of ardeidae (aves: ciconiiformes).the avian family ardeidae comprises long-legged freshwater and coastal birds. there has been considerable disagreement concerning the intrafamilial relationships of ardeidae. mitochondrial cytochrome c oxidase subunit i (coi) was used as a marker for the identification and phylogenetic analysis of avian species. in the present study, we analyzed the coi barcodes of 32 species from 17 genera belonging to the family ardeidae. each bird species possessed a barcode distinct from that of other bird s ...201627706576
scanning electron microscopic study on the tongues of seven avian species.the dorsal lingual surface of the grey crowned crane (balearica regulorum), american flamingo (phoenicopterus rubber), great egret (ardea alba), mallard (anas platyrhynchos), himalayan monal (lophophorus impejanus), black-necked stilt (himantopus mexicanus) and green macaw (ara militaris) were examined by scanning electron microscopy. in the grey crowned crane, the surface of the lingual apex was relatively rough. many openings of the lingual glands in both lateral regions of the lingual body we ...201627904021
mercury distribution along the food chain of a wetland ecosystem at sanjiang plain, northeast china.concentrations of total mercury (t-hg) and methylmercury (mehg) in a wetland food chain were determined at majuan island of the sanjiang plain in china. four tissues (muscle, liver, kidney and brain) of three waterbird species (great cormorant, grey heron and great egret), muscle tissues of fish (grass carp, crucian carp and longnose gudgeon), insects (predacious diving beetle), aquatic plants (ditch reed) and soil were analyzed. the mean concentrations of t-hg were 0.392 ± 0.237 mg/kg for tissu ...201727999881
clinostomum album n. sp. and clinostomum marginatum (rudolphi, 1819), parasites of the great egret ardea alba l. from mississippi, usa.members of the genus clinostomum leidy, 1856, colloquially known as yellow grubs, are cosmopolitan parasites of piscivorous birds, freshwater snails, fish and amphibians. in the southeastern united states, piscivorous birds present a continuous challenge for producers of farm-raised catfish. ciconiiform birds are common hosts of clinostomum spp. in north america and are endemic on most commercial catfish operations. the great egret ardea alba l. is an avian predator often found foraging on comme ...201728062984
advantages and disadvantages of egret and heron brood reduction.data from great egrets and great blue herons were used to test a fundamental assumption of lack's brood-reduction hypothesis, that mortality is brood-size dependent. this was confirmed for the largest brood sizes (4 and 3), which, in egrets, also have the highest sib-fighting rates. broods of one, however, experienced paradoxically high mortality, especially early in the season. the hypothesis is advanced that parents desert unprofitably small broods when sufficient time remains for production o ...198628556322
rejection of the synonymization of pegosomum saginatum (ratz, 1898) ratz, 1903 with pegosomum asperum (wright, 1879) ratz, 1903.the pegosomum ratz, 1903 are digenean parasites of piscivorous birds. they exhibit few morphological autapomorphies and some of their identification features (number of collar spines) can be altered before or during fixation. several re-classifications within the genus were suggested, but they have never been supported by molecular analyses. we addressed the synonymization of species within pegosomum asperum/saginatum complex suggested by dubinin, dubinina and saidov. we analyzed one nuclear (it ...201728720349
hematological indices of injury to lightly oiled birds from the deepwater horizon oil spill.avian mortality events are common following large-scale oil spills. however, the sublethal effects of oil on birds exposed to light external oiling are not clearly understood. we found that american oystercatchers (area of potential impact n = 42, reference n = 21), black skimmers (area of potential impact n = 121, reference n = 88), brown pelicans (area of potential impact n = 91, reference n = 48), and great egrets (area of potential impact n = 57, reference n = 47) captured between 20 june 20 ...201829024020
free-ranging synanthropic birds (ardea alba and columba livia domestica) as carriers of salmonella spp. and diarrheagenic escherichia coli in the vicinity of an urban zoo.the presence of free-ranging urban birds is a risk factor for transmitting pathogens to captive animals and humans alike, including salmonella spp. and diarrheagenic escherichia coli. cloacal swabs from 156 synanthropic great egrets (ardea alba) and feral pigeons (columba livia domestica) that inhabit the surroundings of an urban zoo were processed for the identification of salmonella spp. and diarrheagenic e. coli pathotypes. bacterial species identification and genotypic characterization emplo ...201829261025
proximate and ultimate roles of food amount in regulating egret sibling aggression.in facultatively siblicidal bird species, the amount of food delivered by parent birds to their young ("food amount") has been assumed to be both an important proximate and ultimate cause of fatal aggression. the proximate "food amount hypothesis" (fah) contends that sibling aggression will vary inversely with the quantity of food delivered by the parents, presumably mediated by chick hunger. at the ultimate level, food shortages are expected to influence whether the combined effects of aggressi ...198729357167
productivity of waterbirds in potentially impacted areas of louisiana in 2011 following the deepwater horizon oil spill.the deepwater horizon oil spill (2010) could have affected the behavior and productivity of birds nesting along the gulf of mexico. this research examined the productivity of several species of colonial waterbirds in 2011 in la colonies that were classified according to the m252 peak scat shoreline map oiling designations (as of april 6 2011) within 2 km of each colony. colonies were classified as no oil, little oil, or medium to heavy oil. because of the uneven distribution of oil and variation ...201829427241
link between the adult and the metacercaria of clinostomum heluans braun, 1899 (trematoda: clinostomidae) through dna sequences, and its phylogenetic position within the genus clinostomum leidy, 1856.the phylogenetic position of clinostomum heluans braun, 1899 within the genus clinostomum leidy, 1856 is reported in this study based on sequences of the barcoding region of the mitochondrial cytochrome c oxidase subunit 1 gene (cox1). additionally, molecular data are used to link the adult and the metacercariae of the species. the metacercariae of c. heluans were found encysted infecting the cichlid fish australoheros sp. in minas gerais, brazil, whereas the adults were obtained from the mouth ...201829451846
potential of double-crested cormorants ( phalacrocorax auritus), american white pelicans ( pelecanus erythrorhynchos), and wood storks ( mycteria americana) to transmit a hypervirulent strain of aeromonas hydrophila between channel catfish culture ponds.aeromonas hydrophila is a gram-negative bacterium ubiquitous to freshwater and brackish aquatic environments that can cause disease in fish, humans, reptiles, and birds. recent severe outbreaks of disease in commercial channel catfish ( ictalurus punctatus) aquaculture ponds have been associated with a hypervirulent aeromonas hydrophila strain (vah) that is genetically distinct from less virulent strains. the epidemiology of this disease has not been determined. given that research has shown tha ...201829671715
effects of habitat suitability for vectors, environmental factors and host characteristics on the spatial distribution of the diversity and prevalence of haemosporidians in waterbirds from three brazilian wetlands.wetlands are ecosystems in which vectors of avian haemosporidians live and reproduce and where waterbirds join to breed in colonies. brazil has wetlands at different latitudes, which enables testing the influence of the ecological factors on the prevalence and diversity of haemosporidians. we identified avian haemosporidians in waterbird species in three wetlands and investigated the effects of vector habitat suitability, landscape and host characteristics on the diversity and prevalence of thes ...201829716645
clinostomum poteae n. sp. (digenea: clinostomidae), in the trachea of a double-crested cormorant phalacrocorax auritus lesson, 1831 and molecular data linking the life-cycle stages of clinostomum album rosser, alberson, woodyard, cunningham, pote & griffin, 2017 in mississippi, usa.clinostomum spp. (digenea: clinostomidae) are a group of trematodes commonly found in the buccal cavity and oesophagus of a variety of piscivorous birds. the metacercariae, colloquially known as "yellow grubs," have been reported from a diverse group of freshwater fishes worldwide. in the catfish farming region of the southeastern usa, piscivorous birds present a continuous challenge for aquaculturists in the form of fish depredation and the introduction of trematodes into these static, earthen ...201829855982
using bloodmeal analysis to assess disease risk to wildlife at the new northern limit of a mosquito species.the historically southeastern mosquito species culex erraticus has over the last 30 years undergone a marked expansion north. we evaluated this species' potential to participate in local disease cycles in the northeastern usa by identifying the vertebrate sources of blood in cx. erraticus specimens from new jersey. we found that the majority of bloodmeals (92.6%) were derived from birds, followed by 6.8% from mammals (of which half were human), and a single amphibian bloodmeal from a spring peep ...201830242538
spatial patterns of mercury contamination and associated risk to piscivorous wading birds of the south central united states.piscivorous birds are top predators in aquatic ecosystems and are vulnerable to mercury (hg) exposure and associated adverse health effects. in some areas of north america, the health risk posed to piscivorous birds by hg contamination has not been characterized because concentrations of hg in bird tissues have not been extensively monitored. when data on hg in tissues of piscivorous birds are not available, the concentration of hg in the blood of piscivorous birds can be estimated from the conc ...201930367697
mercury concentration in nestling feathers better predicts individual reproductive success than egg or nestling blood in a piscivorous bird.piscivorous birds are at high risk of mercury exposure in aquatic food webs, and their reproductive success is sensitive to methylmercury exposure. although effects are convincingly shown in a handful of lab studies, sublethal effects at environmentally relevant concentrations in the field, where there is a range of other natural stressors, are not well delineated. part of that uncertainty arises because mercury concentration (hereafter, [hg]) in adult tissues used to assess hg risk can be influ ...201930626179
non-lethal sampling of avian indicators reveals reliable geographic signals of mercury despite highly dynamic patterns of exposure in a large wetland.mercury is a global contaminant with special relevance for aquatic food webs, where biomagnification can result in strong effects on apex predators. non-lethal sampling of tissues such as blood and feathers is often used to assess mercury risk and spatiotemporal variability of mercury exposure on avian populations. however, the assumption that samples from individuals within a population are representative of local mercury exposure underpins those approaches. while this assumption may be justifi ...201930708320
variation in nestling feather mercury concentrations at individual, brood, and breeding colony levels: implications for sampling mercury in birds.nestling feathers are often used to monitor and estimate hg exposure in birds. decision-making and results of studies on effects of exposure to hg depend on adequate estimation of [hg] at the studied level, which in turn is sensitive to variation in [hg] in sampling units. however, there is little information on how feather [hg] varies within nestlings, between nest mates, or between broods. we sampled feathers from sibling great egret nestlings in three breeding colonies of the everglades where ...201930939314
fine scale characteristics of catfish aquaculture ponds influencing piscivorous avian species foraging use in the mississippi delta.piscivorous avian species are the main source of catfish depredation at aquaculture facilities in mississippi, resulting in the economic loss of millions of dollars every year. most notable of these avian species are the double-crested cormorant (phalacrocorax auritus), great blue heron (ardea herodias), and great egret (a. alba). understanding why these species select specific ponds can increase management efficiency directed at avian dispersal and provide insight into their decision making wit ...202032101563
migratory behaviour and survival of great egrets after range expansion in central europe.great egret ardea alba is one of few western palearctic species that underwent a rapid range expansion in the recent decades. originally breeding in central and eastern europe, the species has spread in northern (up to the baltic coast) and western (up to the western france) directions and established viable breeding populations throughout almost entire continent. we monitored one of the first great egrets colonies established in poland to infer migratory patterns and survival rates directly aft ...202032391202
blood supply and arteriography of the pelvic limb of the southern caracara (caracara plancus) and great egret (ardea alba).the aim of this study was to compare the arterial vascularization of the pelvic limb between southern caracara (caracara plancus) and great egret (ardea alba) by dissection and radiographic examinations. five specimens of caracaras (three males and two females), and seven great egrets (five males and two females) were used. barium sulphate and latex suspension were injected into the left ventricle of the birds. the radiographs were taken with the pelvic limbs in the ventrodorsal, dorsoplantar, m ...202032537833
ultraviolet-assisted oiling assessment improves detection of oiled birds experiencing clinical signs of hemolytic anemia after exposure to the deepwater horizon oil spill.while large-scale oil spills can cause acute mortality events in birds, there is increasing evidence that sublethal oil exposure can trigger physiological changes that have implications for individual performance and survival. therefore, improved methods for identifying small amounts of oil on birds are needed. because ultraviolet (uv) light can be used to identify thin crude oil films in water and on substrate that are not visually apparent under normal lighting conditions, we hypothesized that ...202032785887
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