| observations on the sporogony of plasmodium circumflexum kikuth and plasmodium polare manwell in new brunswick. | | 1976 | 3278 |
| hematozoa of the anatidae of the atlantic flyway. ii. tthe maritime provinces of canada. | the prevalence of hematozoa (diagnosed from blood films) in a sample of 4200 anatids representing 14 species collected in new brunswick, nova scotia and prince edward island during the period 1969-1973 is given. thirty percent of the birds harboured hematozoa; the commonest blood parasite was haemoproteus (parahaemoproteus) nettionis (in 18% of the sample), followed by leucocytozoom simondi (in 14% of the sample). four species of plasmodium occurred in 5% of the sample-plasmodium circumflexum wa ... | 1975 | 806712 |
| plasmodium circumflexum: age as a factor in isodiagnosis in anatidae. | | 1975 | 1149870 |
| the prevalence of blood parasites in helmeted guineafowls, numida meleagris, in the kruger national park. | bloodsmears were taken from separate groups of five helmeted guineafowls, numida meleagris, shot at approximately monthly intervals at skukuza and near lower sabie in the kruger national park during the period august 1988 to august 1990. ninety-eight (86%) of 114 guineafowls had single or multiple infections of aegyptianella sp., haemoproteus pratasi, hepatozoon sp., leucocytozoon neavei, plasmodium circumflexum and trypanosoma numidae. the apparent seasonal prevalence of aegyptianella sp., h. p ... | 1991 | 1923376 |
| hematozoa of raptors from southern new jersey and adjacent areas. | blood smears from 259 birds of 12 species, representing four families of raptors, from new jersey, pennsylvania, delaware, and virginia were examined for blood parasites. infected birds constituted 59.1% of the total. birds were infected with one or more of the following genera of protozoa: leucocytozoon (43.2%); haemoproteus (21.6%); plasmodium (1.2%); and trypanosoma (1.2%). blood culture of 142 raptors of 11 species for trypanosoma revealed a prevalence of 41.5%. plasmodium circumflexum is re ... | 1985 | 3981737 |
| two new diving duck hosts for plasmodium circumflexum. | | 1973 | 4687479 |
| blood parasitemia in a south texas wintering waterfowl population. | eleven species of wintering waterfowl were trapped on the welder wildlife foundation, san patricio county, texas, between october, 1976 and may, 1977. blood films were made from 580 ducks. leucocytozoon simondi, haemoproteus nettionis, plasmodium circumflexum, and a microfilaria were found in three species. these blood parasites occurred in 70 lesser scaups (aythya affinis), 12 blue-winged teals (anas discors), and 3 ring-necked ducks (aythya collaris). there was no difference in the rates of i ... | 1980 | 6768901 |
| hematozoa of wood ducks (aix spons) in the atlantic flyway. | a total of 213 wood ducks (aix sponsa) from 24 localities in 12 states in the atlantic flyway was examined for blood parasites in 1976 and 1977. hematozoa were present in birds from every collection site from virginia northward to maine. only one infection was detected in birds from north carolina southward to florida. haemoproteus nettionis was the most common parasite, occurring in 56% of the northern wood ducks; leucocytozoon simondi (20%), plasmodium circumflexum (6%), and microfilariae (18% ... | 1980 | 6774111 |
| blood parasites of prairie anatids and their implication in waterfowl management in alberta and saskatchewan. | information on the blood parasites occurring in 3,866 anatids of 14 species collected from five locations in alberta and saskatchewan during 1976-80 is summarized. an overall prevalence of 26% with avian hematozoa was recorded. leucocytozoon simondi was the most frequently encountered parasite, occurring in 17% of the ducks; haemoproteus nettionis was observed in 11% of the birds while plasmodium circumflexum and microfilariae (probably of splendidofilaria fallisensis) occurred in only 2% and le ... | 1982 | 6813511 |
| blood parasites of trumpeter swans, olor buccinator (richardson), from alberta. | a total of 75 trumpeter swans (olor buccinator (richardson) from the grande prairie region of alberta was examined for hematozoa; 26 (34.6%) swans were infected with haemoproteus nettionis. a single infection of leucocytozoon simondi and two of plasmodium circumflexum also were recorded. local, second year (sy) and adult (ahy) female swans had closely similar rates of hematozoan infection; the sy and ahy male swans had substantially higher infection rates than other subgroups. | 1981 | 7241706 |
| hemograms and hematozoa of sharp-shinned (accipiter striatus) and cooper's hawks (accipiter cooperii) captured during spring migration in northern new york. | hemograms were determined for 26 cooper's (accipiter cooperii) and 55 sharp-shinned hawks (accipiter striatus) captured during spring migration (27 march to 12 may 1987) on the south shore of lake ontario, new york (usa). no significant differences were noted in packed cell volume and estimated total solids between the species. however, cooper's hawks had significantly higher total white blood cells counts and higher concentrations of heterophils, monocytes, and eosinophils. proportionally, lymp ... | 1995 | 8583640 |
| hematozoa of hatch-year common mergansers from michigan. | fifty-five hatch-year common mergansers (mergus merganser) were sampled for hematozoa from douglas lake (michigan, usa) on 17 july 1995. forty-one (75%) were infected with hematozoa. haemoproteus greineri and leucocytozoon simondi were common, infecting 28 (51%) and 26 (47%) common mergansers, respectively. plasmodium circumflexum infected two (4%) birds. the common merganser is a new host record for h. greineri and p. circumflexum. intensity data indicate possible negative interspecific interac ... | 2001 | 11310899 |
| [a brazilian strain of plasmodium circumflexum]. | | 1952 | 13012838 |
| observations on plasmodium circumflexum kikuth and p. vaughani novy and macneal from east pakistan. | | 1958 | 13539706 |
| plasmodium circumflexum in a manitoba duck. | | 1951 | 14908770 |
| the asexual life cycle of the avian malaria parasite, plasmodium circumflexum. | | 1939 | 17781202 |
| seasonal variation in plasmodium prevalence in a population of blue tits cyanistes caeruleus. | 1. seasonal variation in environmental conditions is ubiquitous and can affect the spread of infectious diseases. understanding seasonal patterns of disease incidence can help to identify mechanisms, such as the demography of hosts and vectors, which influence parasite transmission dynamics. 2. we examined seasonal variation in plasmodium infection in a blue tit cyanistes caeruleus population over 3 years using sensitive molecular diagnostic techniques, in light of beaudoin et al.'s (1971; journ ... | 2008 | 18312339 |
| isolation of plasmodium circumflexum from wild guineafowl (numida meleagris) and the experimental infection in domestic poultry. | a strain of plasmodium circumflexum isolated from wild guineafowl was highly pathogenic to turkeys. mortality in turkeys occurred in a biphasic pattern--at the peak of parasitaemia associated with severe anaemia and 7 to 18 days afer the peak associated with the presence of exoerythrocytic schizonts in the brain capillaries. in the acute cases the pathology findings were anaemia, icterus and splenomegaly; in the subacute cases severe splenomegaly, right ventricular hypertrophy and multifocal int ... | 1991 | 18680016 |
| passive immunity in avian malaria. | the effect of therapy with immune serum has been studied in thirty-two cases of plasmodium circumflexum infection, all of them produced by blood inoculation. eighteen of these cases never showed parasites, and seven others developed infections which were definitely milder than those of the controls. the therapeutic serum was in all cases obtained from chronic cases which had previously been superinfected to raise the immune titre. it seems justifiable to conclude that: 1. passive immunity can be ... | 1940 | 19870971 |
| plasmodium circumflexum (kikuth) in ruffed grouse in ontario. | | 1946 | 20996731 |
| dispersal in a patchy landscape reveals contrasting determinants of infection in a wild avian malaria system. | understanding exactly when, where and how hosts become infected with parasites is critical to understanding host-parasite co-evolution in natural populations. however, for host-parasite systems in which hosts or parasites are mobile, for example in vector-borne diseases, the spatial location of infection and the relative importance of parasite exposure at successive host life-history stages are often uncertain. here, using a 6-year longitudinal data set from a spatially referenced population of ... | 2014 | 24117384 |
| mhc supertypes confer both qualitative and quantitative resistance to avian malaria infections in a wild bird population. | major histocompatibility complex (mhc) genes are believed to play a key role in the genetic basis of disease control. although numerous studies have sought links between mhc and disease prevalence, many have ignored the ecological and epidemiological aspects of the host-parasite interaction. consequently, interpreting associations between prevalence and mhc has been difficult, whereas discriminating alleles for qualitative resistance, quantitative resistance and susceptibility remains challengin ... | 2013 | 23516242 |
| plasmodium circumflexum in a shikra (accipiter badius): phylogeny and ultra-structure of the haematozoa. | a wild-caught, juvenile shikra (accipiter badius) was evaluated for rehabilitation at the kasetsart university raptor rehabilitation unit (kurru) with a history of weakness. plasmodium sp. was observed by both light and electron microscopy in blood obtained on day 1 of evaluation. based on the appearance of erythrocytic meronts and gametocytes, the parasites were defined as plasmodium (giovannolaia) circumflexum. the sequence analysis of the mitochondrial cytochrome b gene from the plasmodia was ... | 2012 | 23094585 |
| description of the first cryptic avian malaria parasite, plasmodium homocircumflexum n. sp., with experimental data on its virulence and development in avian hosts and mosquitoes. | for over 100 years studies on avian haemosporidian parasite species have relied on similarities in their morphology to establish a species concept. some exceptional cases have also included information about the life cycle and sporogonic development. more than 50 avian plasmodium spp. have now been described. however, pcr-based studies show a much broader diversity of haemosporidian parasites, indicating the possible existence of a diverse group of cryptic species. in the present study, using bo ... | 2015 | 25449950 |
| fine-scale genetic structure in a wild bird population: the role of limited dispersal and environmentally based selection as causal factors. | individuals are typically not randomly distributed in space; consequently ecological and evolutionary theory depends heavily on understanding the spatial structure of populations. the central challenge of landscape genetics is therefore to link spatial heterogeneity of environments to population genetic structure. here, we employ multivariate spatial analyses to identify environmentally induced genetic structures in a single breeding population of 1174 great tits parus major genotyped at 4701 si ... | 2013 | 24299402 |
| investigation of avian haemosporidian parasites from raptor birds in turkey, with molecular characterisation and microscopic confirmation. | avian haemosporidians are common vector-borne blood parasites that have been reported in birds all over the world. investigations of avian haemosporidian parasites are conducted mainly on passerine birds. however, studies that focus on non-passerine avian hosts are important for our understanding of the true diversity, host specificity and genetic variability among these widespread parasites. in the present study, blood samples from a total of 22 raptor birds belonging to two orders, two familie ... | 2016 | 27507297 |
| molecular characterization of five widespread avian haemosporidian parasites (haemosporida), with perspectives on the pcr-based detection of haemosporidians in wildlife. | haemosporidians (haemosporida) are cosmopolitan in birds. over 250 species of these blood parasites have been described and named; however, molecular markers remain unidentified for the great majority of them. this is unfortunate because linkage between dna sequences and identifications based on morphological species can provide important information about patterns of transmission, virulence, and evolutionary biology of these organisms. there is an urgent need to remedy this because few experts ... | 2014 | 24728557 |