Probable Epizootic Chlamydiosis in Wild California (Larus californicus) and Ring-Billed (Larus delawarensis) Gulls in North Dakota
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منابع مشابه
Probable epizootic chlamydiosis in wild California (Larus californicus) and ring-billed (Larus delawarensis) gulls in North Dakota.
During the summer of 1986, more than 400 California gulls (Larus californicus) and ring-billed gulls (Larvus delawarensis), primarily fledglings, died on an island in Lake Sakakawea near New Town, North Dakota (USA). Mortality was attributed largely to chlamydiosis. Necropsy findings in nine carcasses included splenomegaly (n = 9), hepatomegaly (n = 4), and pericarditis (n = 1). Livers from thr...
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Environmental and behavioral factors have long been assumed to affect variation in avian field metabolic rate (FMR). However, due to the difficulties in measuring continuous behavior of birds over prolonged periods of time, complete time-activity budgets have rarely been examined in relation to FMR. Our objective was to determine the effect of activity (measured by detailed time-activity budget...
متن کاملComparing the retinal structures and functions in two species of gulls (Larus delawarensis and Larus modestus) with significant nocturnal behaviours
Ring-billed gulls (Larus delawarensis) and gray gulls (Larus modestus) are two species active both by day and night. We have investigated the retinal adaptations that allow the diurnal and nocturnal behaviours of these two species. Electroretinograms and histological analyses show that both species have a duplex retina in which cones outnumber rods, but the number of rods appears sufficient to ...
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RECENT•.3⁄4 much attention has been paid to sexual dimorphism in birds in relation to niche utilization. Storer (1966) shows that in three species of accipiters the smaller males take smaller prey on the average than do the females, and he suggests intraspecific competition may be partly responsible for maintaining and increasing the dimorphism, although other basic adaptive functions may also ...
متن کاملBacteroidales diversity in ring-billed gulls (Laurus delawarensis) residing at Lake Michigan beaches.
This study investigated the occurrence and diversity of Bacteroidales fecal bacteria in gulls residing in the Great Lakes region. Members of this bacterial order have been widely employed as human and bovine host-specific markers of fecal pollution; however, few studies have focused on gulls, which can be a major source of fecal indicator bacteria and pathogens at beaches. We found a low but co...
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ژورنال
عنوان ژورنال: Journal of Wildlife Diseases
سال: 1995
ISSN: 0090-3558
DOI: 10.7589/0090-3558-31.3.424