endoparasites of black-bellied whistling ducks in southern texas.endoparasites detected in the black-bellied whistling duck (dendrocygnaautumnalis) include one nasal mite, four nematodes, three trematodes, five cestodes, and two acanthocephalans. each of these represents a new host record. overall, 47% of the birds were parasitized with an average of 12 helminths per infected bird. helminths were significantly more common in juveniles than in adults; more females than males were parasitized, but the difference was not statistically significant. no correlation ...19751167612
experimental inoculation of three arboviruses in black-bellied whistling ducks (dendrocygna autumnalis).wild-caught, immature black-bellied whistling ducks (dendrocygna autumnalis) were inoculated with eastern equine encephalitis (eee), st. louis encephalitis (sle), or western equine encephalitis (wee) virus. susceptibility, duration and titer of viremia, and antibody response to these arboviruses were determined. birds from all inoculated groups became viremic. higher virus titers occurred in the eee group but overall mean titers were not significantly different among experimental groups. all bir ...19921474647
cloacal flora isolated from wild black-bellied whistling ducks (dendrocygna autumnalis) in laguna la nacha, mexico.cloacal swabs from 110 adult black-bellied whistling ducks trapped at laguna la nacha, tamaulipas, mexico, were cultured to determine the prevalence of normal and potentially pathogenic bacteria. twenty-five gram-negative enterobacteria and four gram-positive cocci were isolated. the most common isolates included escherichia coli (54%), staphylococcus spp. (29%), streptococcus spp. (22%), aeromonas hydrophila (15%) enterobacter cloacae (14%), and micrococcus sp. (14%). the implications of whistl ...19921627117
ingested lead shot in northern red-billed whistling ducks (dendrocygna autumnalis) and northern pintails (anas acuta) in sinaloa, mexico. 19873820422
visual sensitivity in the black-bellied tree duck (dendrocygna autumnalis), a crepuscular species. 19744814764
peracute sodium toxicity in free-ranging black-bellied whistling duck ducklings.from 23 to 25 july 2002, 98-103 newly hatched black-bellied whistling ducks (dendrocygna autumnalis) were observed alive at an inland saline lake (la sal vieja) in willacy county, texas (usa). seventy-one (71%) died after showing signs indicative of sodium toxicity within 5 hr of entering the water; some died within minutes. six carcasses were sent to the united states geological survey, national wildlife health center (madison, wisconsin, usa) for analysis, and brain sodium levels of all duckli ...200415465728
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
lead gunshot pellet ingestion and tissue lead levels in wild ducks from argentine hunting hotspots.lead poisoning in waterfowl due to ingestion of lead pellets is a long recognized worldwide problem but poorly studied in south america, particularly in argentinean wetlands where duck hunting with lead gunshot is extensive. in 2008, we found high pellet ingestion rates in a small sample of hunted ducks. to expand our knowledge on the extent of lead exposure and to assess health risks from spent shot intake, during 2011 and 2012 we sampled 415 hunter-killed ducks and 96 live-trapped ducks. we de ...201424314629
description and molecular characterization of haemoproteus macrovacuolatus n. sp. (haemosporida, haemoproteidae), a morphologically unique blood parasite of black-bellied whistling duck (dendrocygna autumnalis) from south america.during a surveillance programme on avian influenza in wild birds in the east of colombia, 42% of examined wild black-bellied whistling ducks (dendrocygna autumnalis) were infected with undescribed haemoproteus sp., which macrogametocytes possess one or several huge (2.5 μm in largest diameter) conspicuous roundish vacuoles, a unique character of avian haemoproteids. this parasite is named haemoproteus (parahaemoproteus) macrovacuolatus and described here using data on the morphology of its gamet ...201424908432
black-bellied whistling duck (dendrocygna autumnalis) brain cholinesterase characterization and diagnosis of anticholinesterase pesticide exposure in wild populations from mexico.rice is the main crop in the subbasin of the fluvial lagoon system of palizada river (flspr) in the state of campeche, mexico. the pesticides used to control pests of this crop mainly are carbofuran, chlorpyrifos, and glyphosate. black-bellied whistling duck (dendrocygna autumnalis) is an ecologically and economically important species in the area. this duck is consumed by local inhabitants throughout the year, despite its potential exposure to pesticides. due to its feeding habits, abundance, a ...200515719990
thalassornectes dendrocygnae new species (acari:hypoderatidae) from the black-bellied whistling-duck (aves:anseriformes; dendrocygnidae).a new species of hypoderatid deutonymph is described from the subcutaneous adipose tissues of the black-bellied whistling-duck, dendrocygna autumnalis (l.), from texas. thalassornectes dendrocygnae n. sp. is most similar to thalassornectes rwandae fain from the white-backed duck, thalassornis leuconotos eyton, in africa. the new species is distinguished by a complete genital apodeme, the interrupted pattern of midventral cuticular sclerotization between coxal fields ii and iii, the dense cuticul ...19968667396
comparison of scotopic sensitivity in diurnal (anas platyrhynchos) and crepuscular (dendrocygna autumnalis) ducks.scotopic visual adaptation curves were obtained from 4 mallard ducks. a curve of best fit was used to compare the mallards' mean adaptation curve to the curve previously reported for the black-bellied tree duck, a crepuscular species. the curves did not differ significantly in either their slopes or base levels (thresholds). the mallards curve had a rod-cone "break" at approximately 25 min. this break is evident in the scotopic curve for pigeons, but is absent from the black-bellied tree ducks' ...19751171123
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