Feeding methods, visual fields and vigilance in dabbling ducks (Anatidae)
نویسندگان
چکیده
منابع مشابه
Predicting resource partitioning and community organization of filter-feeding dabbling ducks from functional morphology.
Resource partitioning due to interspecific differences in phenotype is a key component of ecological and evolutionary theory, but the relationship between morphology and resource use is poorly understood for most species. In addition, ecologists often assume that morphological differences cause distinct resource preferences between species. Using mechanistic models that combine bill morphology ...
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—I compared nesting intervals during three consecutive years in five species of temperate-nesting dabbling ducks (Mallard [Anas platyrhynchos], Northern Pintail [Anas acuta], Northern Shoveler [Anas clypeata], Blue-winged Teal [Anas discors], Gadwall [Anas strepera]) and assessed whether differences existed in timing of refractoriness. Most nesting by females of all five species ended by the su...
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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...
متن کاملThe evolution of bill coloration and plumage dimorphism supports the transference hypothesis in dabbling ducks
Bright coloration in male birds is typically thought to be driven by sexual selection (female choice or male–male competition). Bird species often vary in the intensity of bright coloration, but few studies have addressed this cross-species variation. Potentially this variation could result from either variation in female preferences or in the relative costs of male traits. Species of dabbling ...
متن کاملCondition dependence of iridescent wing flash-marks in two species of dabbling ducks.
Growing empirical evidence supports the hypothesis of male mate choice for female ornaments which are thought to reflect individual quality and future breeding ability. While structural colors are clearly used in mate choice and pairing, the condition dependence of such traits is less obvious, particularly in females. We present spectral measurements of wing flash-marks in two species of dabbli...
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ژورنال
عنوان ژورنال: Functional Ecology
سال: 2002
ISSN: 0269-8463
DOI: 10.1046/j.1365-2435.2002.00652.x