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首页> 外文期刊>The Open Fish Science Journal >Exploring the Biological Basis of Age-Specific Return Variability of Chinook Salmon (Oncorhynchus tshawytscha) From the Robertson Creek Hatchery, British Columbia Using Biological or Physical Oceanographic Explanatory Variables
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Exploring the Biological Basis of Age-Specific Return Variability of Chinook Salmon (Oncorhynchus tshawytscha) From the Robertson Creek Hatchery, British Columbia Using Biological or Physical Oceanographic Explanatory Variables

机译：使用生物或物理海洋学解释变量探索不列颠哥伦比亚省罗伯逊克里克孵化场的奇努克鲑鱼（Oncorhynchus tshawytscha）的特定年龄回报变异的生物学基础

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We used information about hatchery rearing and release practices for 173 releases of age 0+ smolts between 1982 and 2012, as well as time series of early marine prey biomass and predator abundance/biomass, to investigate the biological basis of age-specific return variability of chinook salmon (Oncorhynchus tshawytscha) from the Robertson Creek Hatchery. We used survival rate as the response variable and considered the rate to be an apparent one because it is the product of the survival and maturation rates. Results of multiple regression analyses (adjusted R2 ranging between 0.43 and 0.59) showed that Pacific mackerel (Scomber japonicus) and Steller sea lion (Eumetopias jubatus) abundances accounted consistently for all of the explained variation in age-specific survival rate. We suggest that the persistence of the early marine (predation) effect with age shows that there is no effect of hatchery practice on age at maturity. Apparent survival rate variation was not explained when we used conventional physical oceanographic measurements (temperature, salinity, Pacific Decadal Oscillation Index, Northern Oscillation Index, Arctic Oscillation Index, Aleutian Low Pressure Index, Bakun Upwelling Index, timing of spring transition) in our analyses.
机译：我们使用了有关1982年至2012年间173种0+岁以上软体动物孵化场的孵化场饲养和释放实践的信息，以及早期海洋猎物生物量和捕食者丰富度/生物量的时间序列，以调查特定年龄段的回报的可变性的生物学基础。罗伯逊溪孵化场的奇努克鲑鱼（Oncorhynchus tshawytscha）。我们使用生存率作为响应变量，并认为该率是显而易见的，因为它是生存率和成熟率的乘积。多元回归分析的结果（调整后的R2介于0.43和0.59之间）表明，太平洋鲭鱼（Scomber japonicus）和斯特勒海狮（Eumetopias jubatus）的丰度一致地解释了所有特定年龄存活率的变化。我们建议，随着年龄的增长，早期海洋（捕食）效应的持续性表明，孵化场实践对成熟年龄没有影响。当我们在分析中使用常规物理海洋学测量（温度，盐度，太平洋十进制涛动指数，北部涛动指数，北极涛动指数，阿留申低压指数，巴孔上升指数，春季过渡时间）时，没有解释明显的生存率变化。

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