Chill coma temperatures appear similar along a latitudinal gradient, in contrast to divergent chill coma recovery times, in two widespread ant species
Chill coma temperatures appear similar along a latitudinal gradient, in contrast to divergent chill coma recovery times, in two widespread ant species
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在两种广泛分布的蚂蚁中，冷昏迷温度沿纬度梯度相似，而冷昏迷恢复时间不同
DOI：
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发表时间：
2014
影响因子：
2.8
通讯作者：
Andrey Maysov
中科院分区：
文献类型：
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作者：
Andrey Maysov
广泛分布的外温动物种群表现出与当地气候相对应的不同抗寒性。而有效的体温调节外温细胞可以避免抗寒性的分化。两种蚂蚁，以前被证明，甚至在他们的巢夏季平均温度的纬度差异，被用来测试这一假设，通过比较三个遥远的种群（从50°，60°和67°N）的抗寒性的温度依赖性。这两个物种的栖息地偏好不同，其中一个（Myrmica rubra）比另一个（M. ruginodis）。因此，对它们的抗寒性作了三种不同的预测：沿着纬度梯度，两种鸟的抗寒性可能相似（由于巢/栖息地内的温度调节），或仅M. rubra（由于栖息地之间的温度调节），或分歧，至少在M。Rubra（无体温调节作用）。在这两个物种的人群中，无论是差异还是纬度的变化趋势，在寒冷昏迷温度统计学显着后11个月的标准条件下，有或没有冷硬化。相反，恢复时间显着不同的种群在这两个物种，虽然其纬度趋势是强烈的曲线：在M。在红芥中，中间种群恢复最慢; ruginodis，它倾向于最快。22个月后，除了M。ruginodis在寒冷昏迷温度方面表现出显著的纬度线性趋势（没有显著的种群差异）。因此，温度调节，无论是在栖息地内和栖息地之间，显然确实保持寒冷昏迷温度相似。恢复率表现出分歧，但其曲线趋势表明与祖先种群所经历的气候。
Populations of widely distributed ectotherms demonstrate different cold resistance corresponding to the local climate. However, efficiently thermoregulating ectotherms could avoid divergence in cold resistance. Two species of ants, previously shown to even out latitudinal differences of mean summer temperatures in their nests, were used to test this hypothesis by comparing the temperature dependence of cold resistance in three distant populations (from 50°, 60° and 67°N). The species differ in habitat preferences, one (Myrmica rubra) being less stenotopic than the other (M. ruginodis). Therefore, three different predictions were made about their cold resistance: along the latitudinal gradient, it might be similar within the two species (because of thermoregulation within nests/habitats) or similar only in M. rubra (as a result of thermoregulation among habitats), or divergent at least in M. rubra (no effect of thermoregulation). Among populations of both species, neither differences nor latitudinal trends in chill coma temperature were statistically significant after 11 months of standard conditions, with or without cold hardening. In contrast, recovery time significantly differed among populations in both species, although its latitudinal trends were strongly curvilinear: in M. rubra, the intermediate population tended towards the slowest recovery, and in M. ruginodis, it tended towards the fastest. After 22 months, the patterns remained the same, except that M. ruginodis showed a significant linear latitudinal trend in chill coma temperature (with no significant populational differences). Hence, thermoregulation, both within and among habitats, apparently does keep chill coma temperatures similar. Recovery rate demonstrates divergence, but its curvilinear trends suggest a connection with climates experienced by ancestral populations.