Intraspecific variation in plumage was used to test the null hypotheses that geographic variation of 280 species of elevationally-restricted Andean forest birds is independent of elevation and is not a function of patchy geographic distribution. Both null hypotheses were rejected. / At most taxonomic levels, geographic variation in plumage is positively correlated with both the mean of its elevational distribution and the size of its geographic range. Vertical amplitude of elevational distribution is not a significant predictor of geographic variation in plumage. Independently of these elevational correlates, patchily distributed species show significantly more geographic variation than continuously distributed species. / These results show that geographic variation and presumably on-going speciation phenomena are greater at higher elevations. The decreased species richness at high elevations may be attributable to a higher rate of extinction from catastrophic disturbance as well as to ecological factors that limit sympatry in newly-formed species. / Source: Dissertation Abstracts International, Volume: 44-11, Section: B, page: 3275. / Thesis (Ph.D.)--The Florida State University, 1983.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75232 |
| Contributors | GRAVES, GARY RUSSELL., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 133 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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