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首页> 外文期刊>Chelonian conservation and biology >Daily and Seasonal Basking Behavior in Two South American Freshwater Turtles, Trachemys dorbigni and Phrynops hilarii
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Daily and Seasonal Basking Behavior in Two South American Freshwater Turtles, Trachemys dorbigni and Phrynops hilarii

机译：两只南美淡水龟Trachemys dorbigni和Phrynops hilarii的每日和季节性取暖行为

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摘要

Many species of reptiles maintain their body temperature behaviorally in a narrow range, even in the presence of considerable environmental temperature variation, by choosing microhabitats with different temperatures. In freshwater turtles, thermoregulation is generally achieved by aerial basking, even though they perform all other vital activities such as food consumption and reproduction in the water. Therefore, time budgets related to basking should be constrained and individuals should maximize the energy per unit time during basking, potentially by increasing basking frequency at noon during colder months and increasing use of basking when water temperature decreases. We analyzed basking behavior during the austral summer to study the effects of season, water temperature, and time of day in 2 South American freshwater turtles: Trachemys dorbigni (black-bellied slider) and Phrynops hilarii (Hilaire's side-necked turtle). We found that water temperature negatively affected basking frequency in both species differently; basking by T. dorbigni occurred on a diel cycle while basking by P. hilarii occurred on a seasonal level. Both species showed a bell-shaped basking frequency during the day, with more individuals basking at noon than in the morning and afternoon. However, only P. hilarii showed a significant seasonal effect on basking, with basking frequency decreasing in summer. These results suggest the thermoregulatory role of basking behavior in 2 austral turtle species and its trade-off with other vital activities.
机译：通过选择具有不同温度的微生境，许多爬行动物即使在环境温度变化很大的情况下，也能在很窄的范围内保持体温。在淡水龟中，即使它们进行了所有其他重要活动，例如食物的消耗和水中的繁殖，也通常通过空中取暖来实现温度调节。因此，应限制与取暖有关的时间预算，个人应在取暖期间最大程度地增加单位时间内的能量，这可能是通过在较冷的月份中午增加取暖频率并在水温降低时增加取暖的使用来实现的。我们分析了南半球夏季的晒太阳行为，以研究季节，水温和一天中的时间对两只南美淡水龟的影响：Trachemys dorbigni（黑腹滑块）和Phrynops hilarii（Hilaire的侧颈龟）。我们发现，水温对两个物种的取暖频率有不同的负面影响。 T. dorbigni取暖发生在diel周期，而hilarii取暖发生在季节性水平。两种物种在白天都呈现出钟形的晒太阳频率，中午晒太阳的人多于早晨和下午。然而，只有P. hilarii对取有明显的季节性影响，夏季summer取频率降低。这些结果表明在两种南方海龟物种中取暖行为的温度调节作用及其与其他重要活动的权衡。

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