منابع مشابه
Storms drive altitudinal migration in a tropical bird.
Although migration is a widespread and taxonomically diverse behaviour, the ecological factors shaping migratory behaviour are poorly understood. Like other montane taxa, many birds migrate along elevational gradients in the tropics. Forty years ago, Alexander Skutch postulated that severe storms could drive birds to migrate downhill. Here, we articulate a novel mechanism that could link storms...
متن کاملEnvironmental characteristics drive variation in Amazonian understorey bird assemblages
Tropical bird assemblages display patterns of high alpha and beta diversity and, as tropical birds exhibit strong habitat specificity, their spatial distributions are generally assumed to be driven primarily by environmental heterogeneity and interspecific interactions. However, spatial distributions of some Amazonian forest birds are also often restricted by large rivers and other large-scale ...
متن کاملDeep and wide valleys drive nested phylogeographic patterns across a montane bird community.
Montane species distributions interrupted by valleys can lead to range fragmentation, differentiation and ultimately speciation. Paleoclimatic fluctuations may accentuate or reduce such diversification by temporally altering the extent of montane habitat and may affect species differentially. We examined how an entire montane bird community of the Western Ghats--a linear, coastal tropical mount...
متن کاملPollinator shifts drive petal epidermal evolution on the Macaronesian Islands bird-flowered species.
Pollinator shifts are considered to drive floral trait evolution, yet little is still known about the modifications of petal epidermal surface at a biogeographic region scale. Here we investigated how independent shifts from insects to passerine birds in the Macaronesian Islands consistently modified this floral trait (i.e. absence of papillate cells). Using current phylogenies and extensive ev...
متن کاملOpposing mechanisms drive richness patterns of core and transient bird species.
Studies of biodiversity typically assume that all species are equivalent. However, some species in a community maintain viable populations in the study area, while others occur only occasionally as transient individuals. Here we show that North American bird communities can reliably be divided into core and transient species groups and that the richness of each group is driven by different proc...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1997
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay5167