Collaborative Research: GLOBEC 2000: Feeding, Growth, Condition and Energetics of Juvenile Pink Salmon

该项目的目标是确定阿拉斯加北方海湾的粉红鲑鱼在海上的头几个月如何受到浮游生物生产系统变化的影响。这将通过一个包括实地取样、实验室分析和建模的综合项目来完成。粉红鲑鱼在春季进入海洋沃茨后，在夏季和秋季占据大陆架的表面沃茨。在此期间，它们生长迅速，它们的摄食从夏季的小型浮游动物转变为秋季的大型浮游动物。该项目将记录猎物使用和可用性的时间和空间变化，它将通过测量粉红鲑鱼的状况来评估货架环境的影响，并将使用空间明确的觅食/生物能量模型来了解观察到的摄食，生长和状况模式。孵化场的起源，确定热耳石标记的鱼，将特别感兴趣的，作为海洋生存的每一个孵化场队列将提供一年后，这些鱼进入海洋environment.Spatial和pink鲑鱼饮食和表面浮游动物的时间和空间的变化将通过实验室分析现场样品，并根据饮食转移到更大的猎物将被确定的猎物选择性的计算。将计算标准长度/重量条件测量值，并通过量热法测量鲑鱼的能量含量。将研究条件、生长和环境之间的关系。大陆架上的生境质量将通过空间明确模型进行评估，该模型包括觅食和生物能量组成部分，可产生特定重量的生长潜力估计值。生物能量模型也将用于估计粉红鲑鱼的每日口粮和季节性消费。本研究将直接有助于实现GLOBEC计划的目标，即了解高营养级物种的生产如何与海洋条件的变化相联系。人们普遍认为，果阿鲑鱼的产量取决于鲑鱼的生长。详细描述饮食，猎物的可用性，温度和鱼类状况的空间和时间变化将大大提高我们对海洋环境和鲑鱼生产之间的联系的理解。

The goal of this project is to determine how pink salmon in the northern Gulf of Alaska are affected by variation in the plankton production system during their first months at sea. This will be accomplished through an integrated project that includes field sampling, laboratory analyses and modeling. Pink salmon occupy surface waters of the continental shelf in the summer and fall after entering marine waters in the spring. In that period they grow rapidly and their feeding changes from small zooplankton in the summer to large zooplankton in the fall. This project will document temporal and spatial variation in prey use and availability, it will assess the effects of the shelf environment by measuring condition of pink salmon, and it will use spatially- explicit foraging/bioenergetic modeling to understand observed patterns in feeding, growth and condition. Fish of hatchery origin, identified by thermal otolith marks, will be of particular interest, as the marine survival of each hatchery cohort will be available a year after those fish enter the marine environment.Spatial and temporal variation in pink salmon diets and surface zooplankton will be described through laboratory analyses of field samples, and the basis for diet shifts to larger prey will be determined by calculations of prey selectivity. Standard length/weight condition measures will be calculated, and the energy content of salmon will be measured by calorimetry. The relationship between condition, growth and the environment will be examined. Habitat quality over the continental shelf will be assessed with spatially explicit models with foraging and bioenergetic components that produce weight- specific estimates of growth potential. Bioenergetic modeling will also be used to estimate daily ration and seasonal consumption by pink salmon. The relationship between diets of pink salmon and other planktivorous fishes will be assessed.This research will contribute directly to accomplishment of the GLOBEC program goal of understanding how production of upper trophic level species is linked to variation in oceanographic conditions. It is widely accepted that production of salmon in the GOA is determined by planktonic production. Detailed descriptions of spatial and temporal variation in diet, prey availability, temperature, and fish condition will substantially enhance our understanding of the connections between the marine environment and salmon production.