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
field investigations of winter transmission of eastern equine encephalitis virus in florida.studies investigating winter transmission of eastern equine encephalitis virus (eeev) were conducted in hillsborough county, florida. the virus was detected in culiseta melanura and anopheles quadrimaculatus in february 2012 and 2013, respectively. during the winter months, herons were the most important avian hosts for all mosquito species encountered. in collections carried out in the summer of 2011, blood meals taken from herons were still common, but less frequently encountered than in winte ...201425070997
temporal analysis of feeding patterns of culex erraticus in central blood meals in seven mosquito species previously shown to be infected with eastern equine encephalitis virus at a site in the tuskegee national forest in southcentral alabama were investigated. of 1374 blood meals derived from 88 different host species collected over 6 years from these seven mosquito species, 1099 were derived from culex erraticus. analysis of the temporal pattern of cx. erraticus meals using a runs test revealed that the patterns of feeding upon avian and mammalian hosts f ...201121395423
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
host reproductive phenology drives seasonal patterns of host use in mosquitoes.seasonal shifts in host use by mosquitoes from birds to mammals drive the timing and intensity of annual epidemics of mosquito-borne viruses, such as west nile virus, in north america. the biological mechanism underlying these shifts has been a matter of debate, with hypotheses falling into two camps: (1) the shift is driven by changes in host abundance, or (2) the shift is driven by seasonal changes in the foraging behavior of mosquitoes. here we explored the idea that seasonal changes in host ...201121408172
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
acanthocephalans from crabs in the southeastern u.s., with the first intermediate hosts known for arhythmorhynchus frassoni and hexaglandula corynosoma.cystacanths of hexaglandula corynosoma were discovered in the fiddler crabs uca spinicarpa and uca rapax collected in mississippi and florida. adults were present in yellow-crowned night herons, nyctanassa violacea, collected in florida. cystacanths are very similar to adults, varying only in size and state of development. this is the first record of h. corynosoma from the united states and the first record of an intermediate host for any species of the genus. cystacanths of arhythmorhynchus fra ...200212053984
behavioral, morphological and physiological correlates of diurnal and nocturnal vision in selected wading bird species.we examined in selected wading bird species if diurnal or nocturnal foraging and the use of visual or tactile feeding strategies could be correlated with retinal structure and function. the selected species were the yellow-crowned night heron (nycticorax violaceus), a crepuscular and nocturnal forager, the great blue heron (ardea herodias), a mainly crepuscular, but also diurnal and nocturnal feeder, the roseate spoonbill (ajaia ajaja), a mainly crepuscular feeder which forages more at night tha ...199910473901
synhimantus (synhimantus) magnipapillatus n. sp. (nematoda, acuarioidea) from the yellow-crowned night-heron, nyctanassa violacea cayennensis (gmelin) (aves, ardeidae).synhimantus (synhimantus) magnipapillatus n. sp., mainly considering the outstanding size of the cervical papillae and the delicate structure of the cephalic cordons, is not related to any other species of the genus, except for s. (s.) laticeps, concerning the similarities regarding the spicules, that justify their comparison.20068734948
[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
redescription of chabaudacuaria multispinosa (pérez vigueras, 1938) n. g., n. comb. (nematoda: spirurida: acuariidae) based on specimens from ardea herodias l. and nyctanassa violacea (l.) (ardeidae) in florida.chabaudacuaria n. g. is erected, as monotypic, for c. multispinosa (pérez vigueras, 1938) n. comb. (spirurida: acuariidae) [syns cheilospirura multispinosa pérez vigueras, 1938; acuaria multispinosa (pérez vigueras, 1938) yamaguti, 1961]. this species, a parasite of various ardeid birds, is redescribed by means of light and scanning electron microscopy based on material from great blue herons ardea herodias l. and yellow-crowned night herons nyctanassa violacea (l.) in florida, usa. chabaudacuar ...201222983796
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