U.S. GLOBEC: Reproductive, Growth and Mortality Rates of Calanus and Pseudocalanus on Georges Bank

在乔治岸浅水混合良好的峰顶水域和东北峰及南翼较深水域，观察到Calanus finmarchicus和pseudoalanus spp.的丰度和产量有很大差异。该项目将调查以下假设：冬季，控制缅因湾的水和浮游动物平流到河岸不同地区的不同物理过程，以及河岸不同地区目标桡足类物种的生长和死亡模式的差异，调节了它们在春季和初夏达到的种群规模。作为美国GLOBEC西北大西洋野外研究项目的一部分，该项目第二阶段将重点研究Calanus finmarchicus和pseudoalanus spp.的产蛋量、生长和死亡率。该项目将确定：(1)根据在大规模调查期间用泵取样收集的nauplii和早期桡足动物的分布推断，在冬季/春季在乔治海岸招募Calanus和pseudoalanus；(2)优势桡足类产卵率和产蛋率的空间、季节和年际变化；(3)卵活力、卵和幼体死亡率、幼体发育率的空间、季节和内部变化；(4)卵和无性体的死亡率是否与潜在捕食者的丰度相关。＊＊＊

9613596 Ohman The abundance and production rates of Calanus finmarchicus and Pseudocalanus spp. have been observed to differ greatly between the shallow well-mixed crest waters of Georges Bank and the deeper waters of the northeast peak and the southern flank. This project will investigate the hypothesis that differing physical processes which control the advection of water and zooplankton from the Gulf of Maine onto different regions of the bank during the winter, and differences in growth and mortality patterns of the target copepod species within the different regions of the bank, regulate the population sizes they attain during the spring and early summer. As part of the U.S. GLOBEC Northwest Atlantic Field Studies, Phase 2 program this project will focus on egg production, growth, and mortality of Calanus finmarchicus and Pseudocalanus spp.. This project will determine: (1) the recruitment of Calanus and Pseudocalanus on Georges Bank during the winter/spring period, as inferred from the distribution of nauplii and early copepodites collected with pump samples during the broad scale surveys; (2) the spatial, seasonal and interannual variation in egg production and birth rates for the dominant copepod species; (3) the spatial, seasonal and internal variations in egg viability, egg and naupliar mortality rates, and naupliar development rates; and (4) whether egg and naupliar mortality rates are correlated with abundances of potential predators. ***