Collaborative Research: U.S. GLOBEC: NEP Phase IIIb-CGOA: Links between climate and planktonic food webs

该项目的组织主题是阿拉斯加沿海海湾（CGoA）浮游生物群落的两种食物网模式：小细胞为主（原核生物，皮科和纳米鞭毛虫）或大细胞为主（主要是链状硅藻）;这些模式是由物理和生物条件决定的，既有自下而上的，也有自上而下的;并且每种模式对GLOBEC靶生物的产生具有不同的后果，一个系统主要支持大型桡足类，另一个系统主要支持微生物食物网和粘液网喂养浮游动物（幼虫类和翼足类）是幼鲑鱼的主要猎物。跨学科团队将综合GLOBEC NEP收集的物理，化学和生物数据，以解决环境强迫（包括气候变化）和生态系统状态之间联系的核心概念模型。研究计划分为三个相互作用的综合部门：（1）描述CGoA研究区域的水生食物网。(2)提供对每个实地年（1998-2004年）中气候变化影响区状况的综合看法，并使用长期环境数据集将这些状况置于多十年气候背景下。(3)联合收割机将每年的环境描述与食物网结构/和功能关系结合起来，以便：（a）描述初级和次级生产的年际变化;（B）调查驱动这些变化的可能机制;（c）确定对目标生物的影响：新哲水蚤属，磷虾和幼粉鲑。箱，统计和1-D生态系统模型将被用来解决一系列的这些问题的气候-食物网linkings.Broader影响：控制的机制的理解，每一个CGoA生态系统的两个国家和鲑鱼的后果将有助于基于生态系统的渔业管理，特别是粉红鲑鱼。我们的综合提案将确定直接的机制，如温度升高，淡水排放，分层和风应力，气候与生态系统状态和鲑鱼生产的联系。详细的理解，将来自这种综合可能允许推导出简单的指数，预测生态系统的状态。位于苏厄德的阿拉斯加海洋生物中心的展览经理确认有兴趣开发一个教育展示，展示CGoA的食物网结构，以及这与包括粉红鲑鱼在内的更高营养级的成功/生产的关系。

The organizing theme of this project are the two food-web modes of the planktonic community of the Coastal Gulf of Alaska (CGoA): small cell-dominated (prokaryotes, pico- and nanoflagellates) or large cell-dominated (primarily chain diatoms); that these modes are dictated by physical and biological conditions, both bottom-up and top-down; and that each mode has different consequences for the production of GLOBEC target organisms, with one system primarily supporting large copepods and the other system primarily supporting the microbial food web and the mucous-net feeding zooplankton (larvaceans and pteropods) that are prime prey for juvenile salmon. The interdisciplinary team will synthesize the physical, chemical, and biological data collected by GLOBEC NEP to address this central conceptual model of the linkages between environmental forcing (including climate change) and ecosystem state.The research plan is organized into three interacting sectors of synthesis: (1) Describe the planktonic food web in the CGoA study region. (2) Provide an integrated view of conditions in the CGoA during each of the field years (1998-2004), and place these conditions in a multi-decadal climate context using longer-term environmental data sets. (3) Combine the environmental description for each year with food web structural/ and functional relationships to: (a) describe interannual variations in primary and secondary production; (b) investigate probable mechanisms driving these variations; and (c) determine the consequences for target organisms: Neocalanus spp., euphausiids and juvenile pink salmon. Box, statistical and 1-D ecosystem models will be employed to address a range of these questions about climate-food web linkages.Broader Impacts: Understanding of mechanisms controlling each of the two states of the CGoA ecosystem and the consequences for salmon will contribute to ecosystem based fishery management, especially for pink salmon. Our synthesis proposal will identify direct mechanisms, such as increased temperature, freshwater discharge, stratification and wind stress, by which climate is linked to ecosystem state and to salmon production. The detailed understanding that will come from this synthesis may allow derivation of simple indices for prediction of ecosystem state. The Exhibits Manager at the Alaska SeaLife Center in Seward has confirmed interest in developing an educational display showing the food web structure of the CGoA and how this relates to the success/production of higher trophic levels, including pink salmon.