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首页> 外文期刊>Ethology >Early Activity Rates do not Predict Growth and Future Body Size of Juvenile Eastern Fence Lizards, Sceloporus undulatus
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Early Activity Rates do not Predict Growth and Future Body Size of Juvenile Eastern Fence Lizards, Sceloporus undulatus

机译：早期活动率不能预测幼年东部栅栏蜥蜴，Scoloporus undulatus的生长和将来的体型

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摘要

Selection favors larger body size in many taxa. In some species, larger individuals are more active and bolder than smaller conspecifics, but the nature of this relationship is unclear: Is body size a predictor or a consequence of behavior? Any effect of behavior on body size may be through its effect on competitive ability, suggesting that the presence of potential competitors could exaggerate or suppress this relationship. In this study, we tested whether an individual's activity rates early in life predict its future body size by measuring same-aged, sibling eastern fence lizards before (8d) and after (8wk) they significantly diverged in body size. We tested for an effect of conspecific presence (potential competition) on the relationship between early behavior and future body size by housing some lizards in sibling groups and others individually, using a split-clutch design. Our results reveal that individuals' activity rates do not significantly differ between 8d and 8wk of age. At 8wk (but not 8d) of age, more active siblings were also larger in both housing treatments; however, early activity rates did not predict body size later in development for either of these groups. Conversely, body size at hatching did predict size at 8wk. Although variation in activity rates exists prior to divergence in body size, and activity and body size are correlated later in development, our results suggest that higher activity rates are unlikely to be driving body size divergence in this species. Instead, very small differences in body size at hatching appear to be compounded over time and drive much more exaggerated differences in later body size.
机译：选择有利于许多类群中较大的体型。在某些物种中，较大的个体比较小的同种异体更为活跃和大胆，但是这种关系的性质尚不清楚：身体大小是行为的预测因素还是后果？行为对体型的任何影响都可能是通过其对竞争能力的影响，表明潜在竞争者的存在可能会夸大或抑制这种关系。在这项研究中，我们通过测量同龄，同级的东部篱笆蜥蜴在出生前（8d）和之后（8wk）的体型显着不同，来测试其生命早期的活动率是否可预测其未来的体形。我们使用分体离合设计，通过在同胞组中容纳一些蜥蜴，并在其他人中单独容纳其他蜥蜴，来测试同种存在（潜在竞争）对早期行为与未来体型之间关系的影响。我们的结果表明，在8d和8wk岁之间，个体的活动率没有显着差异。在8周龄（但不是8周龄）时，两种住房治疗中的活跃兄弟姐妹也都更大;但是，对于这两个人群，早期活动率均不能预测其后期的体型。相反，孵化时的体型确实预测了8周的体型。虽然活动率的变化先于体型差异存在，并且活动和体型在发育后期相关，但我们的结果表明，较高的活动率不太可能导致该物种的体型差异。取而代之的是，孵化时身体尺寸的微小差异会随着时间的流逝而加重，并在以后的身体尺寸中造成更大的差异。

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