| Autor: |
M. J. Largen, M. Tandy, D. J. Feener, J. P. Bogart |
| Rok vydání: |
1985 |
| Předmět: |
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| Zdroj: |
Monitore Zoologico Italiano. Supplemento. 20:211-267 |
| ISSN: |
0374-9444 |
| Popis: |
SUMMARY Geographic morphological variation of Bufo kerinyagae Keith, 1968 and Bufo regularis Reuss, 1834 (Anura Bufonidae) related to ecological conditions has been studied using bivariate and multiple regression analyses. B. kerinyagae exhibits variation in body size which is negatively correlated with altitude and mean annual rainfall and positively correlated with mean annual temperature. This pattern may have been produced by natural selection acting to lessen rate of loss of body water in drier environments by affecting surface to volume ratios. It may also reflect faster growth rates at higher temperatures. B. regularis shows clinal variation of body size that is positively correlated with mean annual temperature and mean annual rainfall but not directly related to altitude. This too may represent growth rates related to different primary and secondary productivities of localities with their different temperatures. It could also represent an adaptive strategy favoring small body size in drier areas ... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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