Department of Biology, Kalamazoo College, 1200 Academy St., Kalamazoo, MI, 49006, USA.
Department of Biology, Kalamazoo College, 1200 Academy St., Kalamazoo, MI, 49006, USA.
J Therm Biol. 2020 Dec;94:102784. doi: 10.1016/j.jtherbio.2020.102784. Epub 2020 Nov 17.
Many populations have evolved in response to laboratory environments (lack of predators, continual food availability, etc.). Another potential agent of selection in the lab is exposure to constant thermal environments. Here, we examined changes in growth, critical thermal maximum (CT), and food consumption under constant (25 °C) and fluctuating (22-28 °C and 19-31 °C) conditions in two populations of fathead minnows, Pimephales promelas: one that has been kept in a laboratory setting for over 120 generations (~40 years) and a corresponding wild one. We found that under thermal fluctuations, domesticated fathead minnows grew faster than their wild counterparts, but also exhibited lower thermal tolerance. Food consumption was significantly higher in the lab population under the constant and large fluctuation thermal treatments. Our results suggest that the lab population has adjusted to the stable conditions in the laboratory and that we should carefully apply lessons learned in the lab to wild populations.
许多种群已经进化以适应实验室环境（缺乏捕食者、持续的食物供应等）。实验室中选择的另一个潜在因素是暴露于恒定的热环境中。在这里，我们研究了两种胖头鱼（Pimephales promelas）种群在恒定（25°C）和波动（22-28°C 和 19-31°C）条件下生长、临界热最大值（CT）和食物消耗的变化：一种在实验室环境中保存了超过 120 代（~40 年），另一种则是相应的野生种群。我们发现，在热波动下，驯化的胖头鱼比野生胖头鱼生长得更快，但也表现出较低的热耐受性。在恒温处理和大波动处理下，实验室种群的食物消耗明显更高。我们的结果表明，实验室种群已经适应了实验室的稳定条件，我们应该谨慎地将实验室中获得的经验应用于野生种群。
