Optimum and maximum temperatures of sockeye salmon (Oncorhynchus nerka) populations hatched at different temperatures
Optimum and maximum temperatures of sockeye salmon (Oncorhynchus nerka) populations hatched at different temperatures
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DOI：
10.1139/cjz-2012-0300
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发表时间：
2013-05-01
影响因子：
1.4
通讯作者：
Farrell, A. P.
中科院分区：
文献类型：
--
作者：
Chen, Z.;Anttila, K.;Farrell, A. P.
温度耐受性和心率进行了比较九个红鲑鱼（Oncorhynchus nerka（Walbaum在Artedi，1792））人口，其卵孵化在10，14，和16摄氏度之前，饲养在一个共同的温度下孵化的所有幼鱼。临界最高温度（CTmax）在种群间和温度处理间差异显著。种群迁移距离越短，迁移和产卵温度越低，在孵化后90天的CTmax越高。然而，当在孵化后135-214天比较相似大小的鱼时，这种关系被逆转。CTmax在90天postthatch也呈正相关的体重，这在这个发展阶段的人口之间有明显的不同。随着生长，CTmax的群体差异从3.1 ℃降至1 ℃。升高的孵育温度也降低了CTmax。在14 ℃下孵育的种群中，最大心率的Arabius断点温度（ABT）不同。奇尔科湖种群栖息在海拔1.2公里处，在14摄氏度下孵育时，在所有温度下心率最高，但ABT在种群中最低。这项研究提供了明确的证据，红鲑鱼种群之间的温度耐受性和心脏容量，信息，增加了辩论种内方差是否是适应性的，或约束，或两者兼而有之的地方适应。
Temperature tolerance and heart rates were compared among nine sockeye salmon (Oncorhynchus nerka (Walbaum in Artedi, 1792)) populations, whose eggs were incubated at 10, 14, and 16 degrees C before rearing all hatchlings at a common temperature. Critical thermal maximum (CTmax) significantly differed among populations and temperature treatments. Populations with shorter migration distance and a lower migration and spawning temperature tended to have higher CTmax at 90 days posthatch. However, the relationship was reversed when fish of similar size were compared at 135-214 days posthatch. CTmax at 90 days posthatch was also positively related to body mass, which differed appreciably among populations at this development stage. With growth, the population differences in CTmax diminished from 3.1 to 1 degrees C. Elevated incubation temperature also decreased CTmax. Arrhenius breakpoint temperature (ABT) for maximum heart rate differed among populations incubated at 14 degrees C. The Chilko Lake population, which rear at 1.2 km above sea level, had the highest heart rate across all temperatures when incubated at 14 degrees C, but the lowest ABT among populations. This study provides clear evidence for the local adaptation among sockeye salmon populations with respect to temperature tolerance and cardiac capacity, information that adds to the debate on whether intraspecific variance is adaptive, or a constraint, or both.