GLOBEC 2000: GOA: Copepod and Euphausiid Growth and Reproduction

GLOBEC 2000：GOA：桡足类和磷虾的生长和繁殖

• 批准号: 0105236
• 负责人: Russell Hopcroft
• 金额: --
• 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: 2001-01-15 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0105236&HistoricalAwards=false
• 关键词: GLOBEC; 2000; GOA; Copepod; Euphausiid

A fundamental goal of the GLOBEC program is to understand the secondary production of the coastal Gulf of Alaska (GOA) and how the success of higher trophic levels, specifically salmon, are affected by the variability in the magnitude of secondary production seasonally, inter-annually, and at the decadal scale. Because of the highly advective nature of the GOA, it is necessary to establish the relative importance of local versus imported production. The PIs will determine the rates of development, growth and egg production for the dominant copepod and euphausiid species in the coastal GOA. They will determine the in situ rates inshore and offshore by incubation techniques employing artificial cohorts (copepods) and individual females (both copepods and euphausiids). Incubation techniques are the only appropriate methods for this region due to its highly advective nature. The proposed research will put the in situ rates in perspective by determining their maximal rates under food- saturated conditions in the laboratory. The investigators also will estimate the extent to which secondary production is food-limited in the field by determining the functional relationships of development, growth and egg production to body size, temperature and food regimes. Food regimes will be assessed in terms of chlorophyll and particulate organic carbon, plus the abundance and biomass of autotrophic and heterotrophic protists. In collaboration with other researchers in the GLOBEC program, the implications of physical versus biological processes on the success of salmon recruitment will be established and predicted.

GLOBEC计划的一个基本目标是了解阿拉斯加湾沿岸(GOA)的次生生产量，以及较高营养级的成功，特别是鲑鱼，是如何受到季节性、年际和十年尺度上次生生产量变化的影响的。由于GoA的高度对流性质，有必要确定本地生产与进口生产的相对重要性。PIs将决定沿海果阿主要的桡足类和真足类物种的发育、生长和产卵的速度。他们将通过利用人工群体(桡足类)和单个雌性动物(桡足类和真足类)的孵化技术来确定近岸和近海的就地速率。由于其高度平流的性质，孵化技术是该地区唯一合适的方法。这项拟议的研究将通过在实验室中确定食物饱和条件下的最大速率来正确看待原位速率。研究人员还将通过确定发育、生长和产蛋量与身体大小、温度和食物制度的功能关系，来估计田间二次生产受食物限制的程度。将根据叶绿素和颗粒有机碳以及自养和异养原生生物的丰度和生物量来评估食物状况。与GLOBEC计划中的其他研究人员合作，将建立和预测物理和生物过程对鲑鱼招募成功的影响。