Island Birds
نویسندگان
چکیده
منابع مشابه
Predictable evolution toward flightlessness in volant island birds.
Birds are prolific colonists of islands, where they readily evolve distinct forms. Identifying predictable, directional patterns of evolutionary change in island birds, however, has proved challenging. The "island rule" predicts that island species evolve toward intermediate sizes, but its general applicability to birds is questionable. However, convergent evolution has clearly occurred in the ...
متن کاملEvolution of reproductive life histories in island birds worldwide.
Island environments typically share characteristics such as impoverished biotas and less-seasonal climates, which should be conducive to specific adaptations by organisms. However, with the exception of morphological studies, broad-scale tests of patterns of adaptation on islands are rare. Here, I examine reproductive patterns in island birds worldwide. Reproductive life histories are influence...
متن کاملRecent Records of Land Birds from South Farallon Island, California
In the summers of 1964 and 1965 I obtained specimens of 62 species of land birds on South Farallon Island, located in the Pacific Ocean about 30 miles west of San Francisco, California. Among these are 27 species comprising new records for South Farallon, and thus adding considerably to the list of 74 species of land birds previously known to have occurred on the island (see Townsend, 1885 ; Br...
متن کاملBiogeography of body size in Pacific island birds
Many insular vertebrates have undergone rapid and dramatic changes in body size compared to their mainland counterparts. Here we explore the relationship between two well known patterns of island body size the tendency for large-bodied species to dwarf and small-bodied species to get larger on islands, known as the ‘‘island rule’’, and the scaling of maximum and minimum body size of island asse...
متن کاملLittle evidence for sympatric speciation in island birds.
It has been suggested that the presence of sister species in small circumscribed areas, such as isolated lakes or islands, might imply that these species originated sympatrically. To investigate this possibility in birds, we searched for endemic, congeneric species on isolated islands in the ocean. Among 46 islands and small archipelagos chosen because they contain at least one species of endem...
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ژورنال
عنوان ژورنال: Nature
سال: 1969
ISSN: 0028-0836,1476-4687
DOI: 10.1038/221198a0