首页> 外文会议>Symposium "Sustainability of the Arctic-Yukon-Kuskokwim Salmon Fisheries >Bioenergetic Ontogeny: Linking Climate and Mass-Specific Feeding to Life-Cycle Growth and Survival of Salmon
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Bioenergetic Ontogeny: Linking Climate and Mass-Specific Feeding to Life-Cycle Growth and Survival of Salmon

机译:生物能量植物组织化:将气候和群众饲养与三文鱼生存的饲料

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Size-selective mortality is a dominant variable regulating the dynamics of salmon populations. Body size, growth rate, and energy state during one life stage influence survival during that and subsequent life stages. Therefore, simultaneously examining allometric processes, foraging, and thermal constraints on growth within and among life stages can provide a powerful analytical framework for identifying critical periods and sizes during the life cycle of salmon, and for understanding the processes that contribute to the specific ecological bottlenecks confronting different species or stocks of salmon. A bioenergetics model was used to simulate generalized growth responses to a factorial combination of body size, daily feeding rate, and prey energydensity over a continuous range of temperatures (0-24°C). The results of these simulations indicated that: 1) smaller salmon benefit from higher potential scope for growth or activity than larger salmon, based on the different allometric relationships for maximum consumption, metabolism, and waste; 2) optimal temperatures for growth decfine with increasing body size; 3) optimal temperatures for growth also decline as daily rations decline; 4) thermal tolerances (temperature thresholds beyond which weight loss will occur) also shift to cooler temperatures for larger salmon and when ration sizes decline; 5) increasing the composite energy density of the diet can increase both optimal growth temperature, and thermal tolerance, especially at larger body sizes; 6) after spawners enter freshwater, the amount of energy and days available to migrate, and successfully spawn at a given upstream location was very sensitive to ambient river temperature, and the swimming speed required to reach the spawning grounds. When placed in the context of climate variabihty, seasonal shifts in temperature, and food availabihty, these simulations suggest that growth will be more frequently limited by feeding rate (prey availability) and prey quahty than by temperature, especially for smaller, younger life stages. Larger salmon should be more sensitive to temperature change, but reductions in optimal growth temperature and thermal tolerance would be magnified for all life stages, if either feeding rate or prey quality wereto be reduced. Given intense size-selective mortality during one or more early life stages, this simulation framework could be adopted to identify the key factors limiting growth to critical sizes during critical periods in the life cycle of specific salmon stocks.
机译:大小选择性死亡率是可支配的变量调节鲑鱼种群的动态。车身尺寸方面,增长速度和能量状态过程中和随后的生命阶段一个人生阶段影响生存过程。因此,同时检查异速生长过程,觅食,以及内和之间的生命阶段上生长热约束可以为鲑鱼的生命周期期间识别关键时期和尺寸提供强大的分析框架,并且对于理解向特定的生态瓶颈的过程面对鲑鱼的不同品种或股票。甲生物能学模型被用来在连续的温度范围内,以模拟广义生长反应到车身尺寸,日常饲养率和猎物energydensity的阶乘组合(0-24℃)。这些模拟的结果表明:1)从生长或活性大于鲑高电位范围的基础上,为最大消耗,代谢,和不同的异速生长关系较小鲑益处浪费; 2)对于随体尺寸增长decfine最佳温度; 3)最佳温度为增长也下降,因为每日口粮下降; 4)超出这将发生的重量损失的热容差(温度阈值)也转移到更低的温度对于较大的鲑鱼和当配给尺寸下降; 5)提高饮食的复合能量密度能增加两者的最佳生长温度,并热耐受性,特别是在较大的身体尺寸; 6)产卵进入淡水后,能源和天可用的量迁移,并成功产卵在给定的上游位置是至环境温度河非常敏感,并且所需的游泳速度达到产卵场。当放置在气候variabihty,在温度的季节变化,以及食品availabihty的上下文中,这些模拟表明,增长将通过进料速率(猎物可用性)和猎物quahty更频繁地限于比由温度,特别是对于较小的,较年轻的生命阶段。较大的鲑鱼应该是对温度变化较为敏感,但在最佳生长温度和耐热性的降低会被放大为所有生命阶段,如果wereto减少或者喂养率或猎物质量。考虑到在一个或多个早期生命阶段的激烈大小选择性死亡率,这种仿真框架可以通过识别过程中的具体鲑鱼种群的生命周期的关键时期限制增长的关键尺寸的关键因素。

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