Red-eared slider hatchlings (Trachemys scripta) show a seasonal shift in behavioral types.
Red-eared slider hatchlings (Trachemys scripta) show a seasonal shift in behavioral types.
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红耳龟幼龟（Trachemys scripta）的行为类型呈现季节性变化。
DOI：
10.1002/jez.2315
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Bowden,RachelM
中科院分区：
文献类型：
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作者：
Nichols,Haley;Carter,AmandaW;Paitz,RyanT;Bowden,RachelM
相关的和可重复的行为模式，称为行为类型，可以影响个人的健身。最有利的行为类型可以在可预测的环境中不同（例如，季节性），和母亲介导的影响可能会匹配孵化的行为环境。我们测量了翻正反应，一个行为类型的指标，从早期和晚期的季节离合器出现的青少年红耳滑龟（Trachemys scripta），以了解行为类型的生产是否在整个筑巢季节不同。有一个显着的季节效应，与早期赛季孵化更快地恢复比晚季孵化，我们探讨了两个潜在的潜在机制，母体雌激素和母体投资（例如，蛋黄分配）。我们给早期的季节蛋与雌激素混合物，以模仿晚季蛋，并测定雏翻正反应，但没有发现这种母亲的影响显着。我们通过测量蛋、幼雏和残留卵黄质量来评估母体投资。我们发现了一个季节性的蛋黄分配模式，早季鸡蛋有更多的蛋黄比晚季鸡蛋。早期的季节孵化使用更多的蛋黄的增长，而不是维护现有的组织，导致更大的孵化。有趣的是，在这两个季节中，接受较少母体蛋黄的孵化幼鱼似乎更有效地将蛋黄转化为组织，但我们发现与翻正行为没有直接相关性。我们表明，行为类型的患病率在整个筑巢季节各不相同，在海龟孵化的季节性表型创建相关套件，但似乎既不是母亲的雌激素或蛋黄投资直接导致这种行为的转变。
Correlated and repeatable patterns of behavior, termed behavioral types, can affect individual fitness. The most advantageous behavioral type may differ across predictable environments (e.g., seasonally), and maternally mediated effects may match hatchling behavior to the environment. We measured righting response, an indicator of behavioral type, of juvenile red‐eared slider turtles (Trachemys scripta) emerging from early and late season clutches to understand if the production of behavioral types differs across the nesting season. There was a significant effect of season, with early season hatchlings righting more quickly than late season hatchlings, and we explored two potential underlying mechanisms, maternal estrogens and maternal investment (e.g., yolk allocation). We dosed early season eggs with an estrogen mixture to mimic late season eggs and assayed hatchling righting response, but found no significant effect of this maternal effect. We assessed maternal investment by measuring egg, hatchling, and residual yolk masses. We found a seasonal pattern in yolk allocation, where early season eggs have more yolk than late season eggs. Early season hatchlings used more yolk for growth rather than maintenance of existing tissues, resulting in larger hatchlings. Interestingly, across both seasons, hatchlings that received less maternal yolk appeared to be more efficient at converting yolk to tissue, but we found no direct correlation with righting behavior. We demonstrate that the prevalence of behavioral types varies across the nesting season, creating correlated suites of seasonal phenotypes in turtle hatchlings, but it appears that neither maternal estrogens or investment in yolk directly underlie this shift in behavior.