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首页> 外文期刊>Canadian Journal of Zoology >Minimal overwintering temperatures of red-sided garter snakes (Thamnophis sirtalis parietalis): a possible cue for emergence?
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Minimal overwintering temperatures of red-sided garter snakes (Thamnophis sirtalis parietalis): a possible cue for emergence?

机译：红袜带蛇（Thamnophis sirtalis parietalis）的最低越冬温度：是否可能出现？

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摘要

Red-sided garter snakes (Thamnophis sirtalis parietalis (Say in James, 1823)) in Manitoba, Canada, undergo 8 months of continuous winter dormancy prior to spring emergence. As in other ectothermic species, increases in ground temperature may be the cue for emergence from winter dormancy in these populations. To test this hypothesis, we measured body temperatures during winter dormancy by surgically implanting small temperature loggers into 32 female red-sided garter snakes before they entered their native hibernaculum. The following spring, we recaptured seven of the snakes implanted with temperature loggers. Body temperature declined gradually from mid-September (14.7 +- 0.24 deg C, mean +-SE) to early April (1.1 +-0.16 deg C, mean +- SE) duringwinter dormancy, reaching minimal values approximately 1 month prior to spring emergence. Body temperatures of emerging snakes ranged from 0.5 deg C during early spring to 6.3 deg C during late spring (3.4 +- 0.84 deg C, mean +- SE). These results do notsupport the hypothesis that an increase in ground temperature (and hence body temperature) is necessary for emergence from winter dormancy. We suggest that critically low temperatures (i.e., 0.5-1 deg C) are a Zeitgeber entraining an endogenous circannual cycle that regulates snake emergence. These results offer new insight into the mechanisms regulating seasonal emergence from winter dormancy.
机译：加拿大曼尼托巴省的红袜带蛇（Thamnophis sirtalis parietalis（Say in James，1823））在春季出现之前经历了连续8个月的冬季休眠。与其他外热物种一样，这些人群中冬季休眠可能会导致地温升高。为了验证这一假设，我们在冬季休眠期间测量了体温，方法是将小型温度记录仪通过外科手术植入32条雌性红袜带蛇中，然后再进入本地冬眠。第二年春天，我们重新捕获了七只植入温度记录器的蛇。在冬季休眠期间，体温从9月中旬（14.7±-0.24摄氏度，平均+ -SE）到4月初（1.1±-0.16摄氏度，平均+ -SE）逐渐下降，在春季出现之前约1个月达到最小值。新兴蛇的体温范围从早春的0.5摄氏度到春末的6.3摄氏度（3.4±0.84摄氏度，平均值±SE）。这些结果不支持这样的假设，即从冬季休眠中出来需要增加地温（进而升高体温）。我们建议临界低温（即0.5-1摄氏度）是Zeitgeber夹带的内生性周期性循环，可调节蛇的出现。这些结果提供了新的洞察力，以调节冬季休眠后季节性出现的机制。

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