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

合作研究：GLOBEC 2000：粉红鲑鱼幼鱼的饲养、生长、状况和能量

• 批准号: 0104622
• 负责人: Lewis Haldorson
• 金额: $ 76万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104622&HistoricalAwards=false
• 关键词: Collaborative; Research; GLOBEC; 2000; Feeding

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.

这个项目的目标是确定阿拉斯加湾北部的粉红鲑鱼在出海的头几个月里是如何受到浮游生物生产系统变化的影响的。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。粉鲑在春季进入海水后，夏秋两季占据大陆架表层水域。在这一时期，它们生长迅速，它们的食物从夏季的小型浮游动物转变为秋季的大型浮游动物。该项目将记录猎物利用和可得性的时空变化，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/生物能量模型来理解观察到的喂养、生长和条件模式。通过热耳石标记识别的孵化场来源的鱼将特别令人感兴趣，因为每个孵化场队列的海洋存活率将在这些鱼进入海洋环境一年后提供。将通过对野外样本的实验室分析来描述粉红鲑鱼饮食和表层浮游动物的时空变化，并通过对猎物选择性的计算来确定饮食向较大猎物转移的基础。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具有觅食和生物能量成分的空间明确模型进行评估，这些模型可以产生特定重量的生长潜力估计。生物能量模型还将用于估计粉红鲑鱼的每日定量和季节性消费量。将评估粉红鲑鱼和其他浮游生物食性鱼类之间的关系。这项研究将直接有助于实现GLOBEC计划的目标，即了解营养上层物种的生产如何与海洋条件的变化相关联。人们普遍认为，果阿地区的鲑鱼产量是由浮游生物产量决定的。详细描述饮食、猎物可得性、温度和鱼类状况的时空变化将大大提高我们对海洋环境和鲑鱼产量之间联系的理解。