Literaturdatenbank
Literaturdatenbank |
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Iverson, J. B., Balgooyan, C. P., Byrd, K. K., & Lyddan, K. K. (1993). Latitudinal variation in clutch size and egg size in turtles. Canadian Journal of Zoology, 71(12), 2448–2461.
Added by: Sarina Wunderlich (23 Aug 2008 14:56:16 UTC) Last edited by: Beate Pfau (31 May 2009 11:38:03 UTC) |
| Resource type: Journal Article BibTeX citation key: Iverson1993b View all bibliographic details  |
Categories: General Keywords: Apalone, Apalone mutica, Apalone spinifera, Caretta, Caretta caretta, Cheloniidae, Chelydra, Chelydra serpentina, Chelydridae, Chrysemys, Chrysemys picta, Deirochelys, Deirochelys reticularia, Emydidae, Fortpflanzung = reproduction, Habitat = habitat, Kinosternidae, Kinosternon, Kinosternon flavescens, Kinosternon subrubrum, Lissemys, Lissemys punctata, Malaclemys, Malaclemys terrapin, Schildkröten = turtles + tortoises, Sternotherus, Sternotherus odoratus, Trachemys, Trachemys scripta, Trionychidae Creators: Balgooyan, Byrd, Iverson, Lyddan Collection: Canadian Journal of Zoology |
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| Abstract |
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Reproductive and body size data from 169 populations of 146 species (56% of those recognized), 65 genera (75%), and 11 families (92%) of turtles were tabulated to test for latitudinal variation in egg and clutch size. Body-size-adjusted correlation analysis of all populations (as well as within most families) revealed (i) a significant negative relationship (r super(2) = 0.26) between latitude and egg size, (ii) a significant positive relationship (r super(2) = 0.21) between latitude and clutch size, and (iii) no relationship between latitude and clutch mass. Phylogenetic contrast analyses corroborated these patterns. Clutch size was also negatively correlated with egg size across all populations as well as within most families. We evaluate the applicability to turtles of hypotheses postulated to explain such latitudinal patterns for other vertebrate groups. The observed pattern may be the result of latitudinal variation in selection on egg size and (or) clutch size, as well as on the optimal trade-off between these two traits.
Added by: Beate Pfau Last edited by: Beate Pfau |