Mulhollem Joshua J, Suski Cory D, Wahl David H
Kaskaskia Biological Station, Illinois Natural History Survey, 1235 County Rd. N., Sullivan, IL, 61951, USA,
Fish Physiol Biochem. 2015 Aug;41(4):833-42. doi: 10.1007/s10695-015-0050-0. Epub 2015 Apr 14.
Due to concerns of global climate change, additional research is needed to quantify the thermal tolerance of species, and how organisms are able to adapt to changes in thermal regime. We quantified the thermal tolerance and thermal stress response of a temperate sportfish from two different thermal environments. One group of largemouth bass (Micropterus salmoides) inhabited thermally enhanced reservoirs (used for power plant cooling), with water temperatures typically 2-5°C warmer than nearby reservoirs. We tested fish for chronic thermal maxima and reaction to an 8°C heat shock using three common physiological indices of stress. We observed no evidence of differences between groups in thermal maxima. We observed no differences in thermal maxima between fish from artificially warmed and natural systems. Our results disagree with research, suggesting differences due to adaptation to different thermal environments. We speculate that behavioral modifications, lack of adequate time for genetic divergence, or the robust genetic plasticity of largemouth bass explain the lack of difference between treatment groups.
由于对全球气候变化的担忧，需要开展更多研究来量化物种的热耐受性，以及生物体如何适应热环境的变化。我们量化了来自两种不同热环境的温带游钓鱼类的热耐受性和热应激反应。一组大口黑鲈（Micropterus salmoides）栖息在热增强型水库（用于发电厂冷却）中，其水温通常比附近水库高2-5°C。我们使用三种常见的应激生理指标，测试了鱼类的慢性热最大值以及对8°C热休克的反应。我们没有观察到两组在热最大值方面存在差异的证据。我们也没有观察到来自人工增温系统和自然系统的鱼类在热最大值上有差异。我们的结果与一些研究结果不同，那些研究表明适应不同热环境会产生差异。我们推测，行为改变、缺乏足够的时间进行遗传分化，或者大口黑鲈强大的遗传可塑性，解释了处理组之间缺乏差异的原因。
