U.S. GLOBEC Phytoplankton and Protozoa in the Diets of Copepods and Larval Cod on Georges Bank

该项目是美国- globec西北大西洋项目支持下的多学科、多研究者项目的一个组成部分。整个计划，在本提案的序言中描述，建议研究生活史和重要的生理速率，导致鳕鱼，黑线鳕和他们的食物资源在乔治海岸的招募。具体而言，本项目旨在定量和定性地描述乔治河岸的纳米和微型浮游生物捕食区，并测量大西洋鳕鱼（Gadus morhua）的早期生活史阶段对纳米和微型浮游生物（即大小为2- 200um的植物和动物猎物）的消耗，以及其主要猎物之一的桡足动物（Calanus finmarchicus）的所有桡足动物生活史阶段。在不同条件下的水柱混合和分层。消费者的摄食率将在船上实验中直接测量，使用天然猎物组合。杂食性取食对消费者的直接影响将在原地猎物场和物理状态（混合与分层）的背景下解释。最终，消费者饮食中植物和动物猎物的影响将在其他调查人员对消费者分布、条件、生活史参数和生产进行测量的背景下协同解决。＊＊＊

9313679 Sieracki This project represents one component of a multidisciplinary, multi-investigator program under the aegis of the U.S.-GLOBEC Northwest Atlantic initiative. The overall program, described in the Prologue to this proposal, proposes to study the life histories and vital physiological rates leading to recruitment of cod, haddock, and their food resources on Georges Bank. Specifically, this project seeks to describe quantitatively and qualitatively the nano- and micro- plankton prey fields on Georges Bank and to measure consumption of nano- and microplankton organisms (i.e. plant and animal prey 2-200 um in size) by early life history stages of Atlantic cod, Gadus morhua, and by all copepodid life history stages of one of its major prey species, the calanoid copepod, Calanus finmarchicus, under various conditions of water column mixing and stratification on Georges Bank. Ingestion rates of consumers will be measured directly in shipboard experiments using natural prey assemblages. The proximate influence of omnivorous feeding on the consumers will be interpreted in the context of the in situ prey field and physical regime (mixing versus stratification). Ultimately, the influence of plant versus animal prey in consumer diet will be addressed collaboratively in the context of measurements made by other investigators of consumer distribution, condition, life history parameters and production. ***