Size-dependent thermal preferences in a pelagic fish
Size-dependent thermal preferences in a pelagic fish
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DOI：
10.1111/j.1600-0706.2009.18125.x
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发表时间：
2010-08-01
期刊：
影响因子：
3.4
通讯作者：
Yamamura, Orio
中科院分区：
文献类型：
--
作者：
Morita, Kentaro;Fukuwaka, Masa-aki;Yamamura, Orio
大鱼常栖息在比小鱼冷的沃茨。使用一个简单的生物能量模型，我们发现，最佳的生长温度应随着身体的大小。我们预测，这种机制将产生个体发育的变化，热偏好，然后测试我们的预测与太平洋鲑鱼，虹鳟属。在室内试验中，生长增量对初始大小的回归斜率随温度的升高而变陡，最适生长温度随个体大小的增加而降低。在实地观察中，较大和较老的鲑鱼居住在较冷的地区，而较小和较年轻的鲑鱼居住在温暖的地区。这些模式与温度对条件因子的大小依赖性影响一致，该参数在实验上被证明是最近生长性能的量度。温度最大化的条件因素是较低的较大的鱼。因此，个体对凉爽地区的热偏好的个体发育变化最大限度地提高了鱼类的生长性能，气候变暖对生长的负面影响被假设为更大的鱼更严重。
Large fish often inhabit colder waters than small fish. Using a simple bioenergetic model, we found that the optimal temperature for growth should decrease with increasing body size. We predicted that this mechanism would produce an ontogenetic change in thermal preference and then tested our predictions with Pacific salmon, Oncorhynchus spp. In a laboratory experiment, the slope of a regression of growth increment on initial size became steeper with increasing temperature, so that the optimal temperature for growth decreased with increasing body size. In field observations, larger and older salmon inhabited cooler areas, whereas smaller and younger salmon inhabited warmer areas. These patterns were consistent with a size-dependent effect of temperature on condition factor, a parameter shown experimentally to be a measure of the most recent growth performance. Temperatures for maximising condition factor were lower for larger fish. Thus, an ontogenetic change in individual thermal preference toward cooler areas maximises the growth performance of fish, and the negative effects of climate warming on growth are hypothesised to be more severe for larger fish.