منابع مشابه
The Great American Biotic Interchange in birds.
The sudden exchange of mammals over the land bridge between the previously isolated continents of North and South America is among the most celebrated events in the faunal history of the New World. This exchange resulted in the rapid merging of continental mammalian faunas that had evolved in almost complete isolation from each other for tens of millions of years. Yet, the wider importance of l...
متن کاملNorth American Birds and West Nile Virus
Whether tempter sent, or whether tempest tossed thee here ashore, Desolate, yet all undaunted, on this desert land enchanted— On this home by horror haunted—tell me—tell me I implore! " Is there—is there balm in Gilead?—tell me—tell me I implore! " Edgar Allan Poe " The Raven " " N ot far from the house sat a great wooden raven mounted on a rather low pole; his wings were flattened to his sides...
متن کاملThe Helminth Parasites of Birds , Iii : Dicrocoeliid Trematodes from North American Birds
During the past several years we have examined, for helminth parasites, more than 700 specimens of wild birds, which represent 14 orders, 40 families, and 134 species. Although the avian hosts came from various localities throughout the southeastern section of the United States, the greater concentrations were collected from State College, Miss. ; Athens and Augusta, Ga. ; Highlands, N. C. ; Re...
متن کاملEcological correlates of geographical range occupancy in North American birds
Aim The degree to which a species is predictably encountered within its range varies tremendously across species. Understanding why some species occur less frequently within their range than others has important consequences for conservation and for analyses of ecological patterns based on range maps. We examined whether patterns in geographical range occupancy can be explained by species-level...
متن کاملSpatial Autocorrelation and Local Disappearances in Wintering North American Birds
I examined the degree to which population sizes of North American wintering birds exhibit spatial synchrony (autocorrelation) and local disappearances based on 30 yr of Christmas Bird Counts. The primary goal of these analyses was to determine whether processes expected in metapopulations, including low spatial synchrony, frequent local disappearances, and colonization leading to population res...
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ژورنال
عنوان ژورنال: Science
سال: 1908
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.27.683.182