US GLOBEC: Egg Production, Growth, and Mortality, and the Role of Frontal Processes in Copepod Population Dynamics on Georges Bank

9806566 Ohman U.S. GLOBEC第一和第二阶段的结果表明，芬兰哲水蚤和伪哲水蚤的丰度和生产率。在乔治浅滩的浅混合良好的波峰沃茨和东北峰和南翼的较深的沃茨之间差异很大。 Ohman博士及其同事认为，这种较小规模的时间和空间变异性受生命率（招募，生长和死亡）和GB上的前沿过程（收敛，前沿之间的汇率）的变化控制。 他们将通过以下具体目标来解决这些问题：（1）作为浮游动物大规模调查的一部分，确定冬季/春季期间乔治银行的哲水蚤，伪哲水蚤和其他桡足类无节幼体丰度的时空变化。(2)测定优势桡足类物种（哲水蚤和拟哲水蚤）的产卵量、生长率、生理状况和死亡率的空间、季节和年际变化。(3)确定丰度，个体生长率和目标桡足类物种的生理条件，以及其他浮游动物物种的丰度，在精细的空间尺度在4月下旬至5月上旬的顶部南侧潮汐混合锋。(4)向建模和综合小组提供关于桡足类分布、补充、生长和死亡率的数据。该项目由四个单独的组成部分组成，合并为一个提案。 这些组成部分是：（2）哲水蚤、伪哲水蚤和其他优势桡足类产卵率的测定;（3）哲水蚤和伪哲水蚤的生长率测定;（4）哲水蚤和伪哲水蚤的卵和无节幼体死亡率的估算。 泵调查将在每次大规模调查巡航期间进行，而后三个部分将在每次工艺巡航期间进行，尽管大规模调查雌性丰度数据将用于整个银行的产卵量估计。

9806566Ohman U.S. GLOBEC Phase I and II results showed that the abundance and production rates of Calanus finmarchicus and Pseudocalanus spp. differ greatly between the shallow well-mixed crest waters of Georges Bank and the deeper waters of the northeast peak and the southern flank. Dr. Ohman and associates suggest that this smaller scale temporal and spatial variability is controlled by variations in vital rates (recruitment, growth and mortality) and frontal processes on GB (convergences, exchange rates across fronts). They will address these questions through the following specific objectives: (1) Determine spatial and temporal changes in abundance of nauplii of Calanus, Pseudocalanus, and of other copepods on Georges Bank during the winter/spring period as a part of the zooplankton broad-scale survey. (2) Determine the spatial, seasonal and inter-annual variation in egg production, growth rates, physiological condition and mortality for the dominant copepod species including Calanus and Pseudocalanus. (3) Determine abundance, individual growth rates, and physiological condition of the target copepod species, as well as the abundance of other zooplankton species, over fine spatial scales across the crest-southern flank tidal mixing front during late April-early May. (4) Provide the modeling and synthesis groups with data on copepod distribution, recruitment, growth and mortality rates. This project is composed of four separate components which have been combined in one proposal. These components are: (1) the broad-scale pump survey, (2) the egg laying rate measurements of Calanus, Pseudocalanus, and other dominant copepods (3) the growth rate measurements of Calanus and Pseudocalanus, and (4) the estimation of egg and naupliar mortality of Calanus and Pseudocalanus. The pump survey will take place during each of the broad scale survey cruises while the latter three components will be carried out during each of the process cruises although broad scale survey female abundance data will be used in bank-wide egg production estimates.