期刊
ECOLOGY
卷 96, 期 8, 页码 2077-2092出版社
WILEY
DOI: 10.1890/14-1996.1
关键词
bite force; body shape; diet; Greece; insularity; island biogeography; island gigantism; Lacertidae; Podarcis gaigeae; population divergence; predation; Skyros wall lizard
类别
资金
- Wenner-Gren Foundation
- Lennanders Stiftelse
- Royal Physiographic Society
- Helge Ax:son Johnsons stiftelse
- Lars Hiertas Minne
- Langmanska kulturfonden
- The Royal Swedish Academy of Sciences
- Swedish Research Council
Although rapid evolution of body size on islands has long been known, the ecological mechanisms behind this island phenomenon remain poorly understood. Diet is an important selective pressure for morphological divergence. Here we investigate if selection for novel diets has contributed to the multiple independent cases of island gigantism in the Skyros wall lizard (Podarcis gaigeae) and if diet, predation, or both factors best explain island gigantism. We combined data on body size, shape, bite force, and realized and available diets to address this. Several lines of evidence suggest that diet has contributed to the island gigantism. The larger islet lizards have relatively wider heads and higher bite performance in relation to mainland lizards than would be expected from size differences alone. The proportions of consumed and available hard prey are higher on islets than mainland localities, and lizard body size is significantly correlated with the proportion of hard prey. Furthermore, the main axis of divergence in head shape is significantly correlated with dietary divergence. Finally, a model with only diet and one including diet and predation regime explain body size divergence equally well. Our results suggest that diet is an important ecological factor behind insular body size divergence, but could be consistent with an additional role for predation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据