Publications

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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 ...19806768901
trichobilharzia physellae (digenea: schistosomatidae) from endemic waterfowl on the high plains of texas.adult trichobilharzia physellae were recovered from the liver and mesenteric veins of green-winged teal, anas creca, blue-winged teal, a. discors, and pintail, a. acuta, breeding on the high plains of texas. wild ducks naturally-infected with these schistosomes were emaciated with mild to severe atrophy of the breast musculature. the liver was considerably enlarged, pale and somewhat friable. numerous viable and dead t. physellae were recovered from the cut surface. on histologic examination, vi ...19827097873
tetrameres (petrowimeres) striata in ducks.tetrameres (petrowimeres) striata is an uncommon and incompletely described nematode from north american and eurasian waterfowl. specimens collected from mallards (anas platyrhynchos) from the playa lakes region (plr) in western texas (usa), the mottled duck (a. platyrhynchos fulvigula) in florida (usa), the mallard in the amur river basin of eastern russia and the blue-winged teal (anas discors) from western texas (usa) provide the basis for redescription of t. (p.) striata. this species is dif ...19947933277
avian influenza viruses and paramyxoviruses in wintering and resident ducks in texas.cloacal swabs were collected from teal (anas crecca, anas cyanoptera, anas discors), mottled duck (anas fulvigula) and northern pintail (anas acuta) in brazoria county, texas, usa, during february 2001, mottled ducks during august 2001, and blue-winged teal (a. discors) during february 2002. prevalence of avian influenza virus (aiv) infections during each sampling period were 11, 0, and 15%, respectively. the hemagglutinin (h) subtypes h2 and h7 were detected in both years, while the h8 subtype ...200516244076
avian influenza surveillance in hunter-harvested waterfowl from the gulf coast of texas (november 2005-january 2006).the objectives of our study were to determine prevalence of avian influenza viruses (aiv) on wintering grounds on the texas gulf coast, usa, and to compare real-time reverse-transcriptase polymerase chain reaction (rrt-pcr) and virus isolation for detection of aiv in cloacal swabs from wild waterfowl. cloacal swabs were collected from hunter-harvested waterfowl from november 2005 to january 2006 at four wildlife management areas. seven aiv were isolated from four species of ducks: green-winged t ...200818436675
assessing helminth community structure and patterns in gizzard helminths of blue-winged teal (anas discors).helminth community structure (prevalence and abundance) and patterns (associations and distributions) of gizzard worms were examined in blue-winged teal (anas discors) migrating through south texas to their wintering grounds (n = 50) and as they migrated back to their breeding grounds (n = 50). three species of nematodes (amidostomum acutum, epomidiostomum uncinatum, and streptocara crassicauda) and 1 species of cestode (gastrotaenia cygni) were recovered, representing 1,164 helminth individuals ...201323574150
optimizing surveillance for south american origin influenza a viruses along the united states gulf coast through genomic characterization of isolates from blue-winged teal (anas discors).relative to research focused on inter-continental viral exchange between eurasia and north america, less attention has been directed towards understanding the redistribution of influenza a viruses (iavs) by wild birds between north america and south america. in this study, we genomically characterized 45 viruses isolated from blue-winged teal (anas discors) along the texas and louisiana gulf coast during march of 2012 and 2013, coincident with northward migration of this species from neotropical ...201625056712
blood parasites of blue-winged teal ( anas discors ) from two migratory corridors, in the southern usa.we collected 180 blue-winged teal ( anas discors ) in september and october 2002 from florida, us (n=100, representing the eastern migratory corridor) and the louisiana-texas, us, border (n=80, representing the western migratory corridor) and examined for blood parasites using thin heart-blood smears. leucocytozoon simondi, haemoproteus nettionis, and microfilariae were found in 16, 23, and 27 birds, respectively. prevalence of l. simondi and h. nettionis did not vary by migratory corridor, but ...201627285417
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