نتایج جستجو برای: swans and ducks 52 and rails
تعداد نتایج: 16840755 فیلتر نتایج به سال:
The degree to which vertebrate herbivores exploitatively compete for the same food plant may depend on the level of compensatory plant growth. Such compensation is higher when there is reduced density-dependent competition in plants after herbivore damage. Whether there is relief from competition may largely be determined by the life-history stage of plants under herbivory. Such stage-specific ...
the following null hypothesis was proposed: there is no significant difference between the efl students listening comprehension development receiving pictorial cues and those receiving no cuse. to test the null hypothesis, 52 male and femal freshmen students of medicine studing at iran university of medical scinces were randomly selected from a total population of 72 students. to ensure that th...
In 2010, an H5N1 highly pathogenic avian influenza virus (HPAIV) was isolated from feces of apparently healthy ducks migrating southward in Hokkaido, the northernmost prefecture of Japan. The H5N1 HPAIVs were subsequently detected in domestic and wild birds at multiple sites corresponding to the flyway of the waterfowl having stopovers in the Japanese archipelago. The Hokkaido isolate was genet...
We examined whether host traits influenced the occurrence of avian influenza virus (AIV) in Anatidae (ducks, geese, swans) at wintering sites in California's Central Valley. In total, 3487 individuals were sampled at Sacramento National Wildlife Refuge and Conaway Ranch Duck Club during the hunting season of 2007-08. Of the 19 Anatidae species sampled, prevalence was highest in the northern sho...
In Japan, no influenza epidemics have been recognized in domestic fowls since the last fowl plague outbreak caused by H7N7 influenza virus in chickens in 1924-1926. On the other hand, influenza viruses of different subtypes have been isolated from wild ducks, geese, and swans. Antigenic and genetic analyses of H3 influenza viruses isolated from migratory ducks captured on the Pacific flyway in ...
The spread of the Highly Pathogenic Avian Influenza (HPAI) sub-type H5N1 has been an issue of international concern. This spread presents a serious threat to domestic poultry and a potentially serious risk to human health. It is also an issue which could potentially have consequences for populations of wild birds and other animal species of conservation concern. As wildfowl (ducks, swans and ge...
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