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

GLOBEC一期和二期结果表明，在乔治滩浅水混合良好的峰顶水域与东北峰和南翼较深水域，Calanus finmarchicus和pseudoalanus sp.的丰度和产量差异很大。Ohman博士及其同事认为，这种较小尺度的时间和空间变异是由生命速率（招募、生长和死亡率）和GB的锋面过程（收敛、锋面之间的汇率）的变化控制的。他们将通过以下具体目标来解决这些问题：(1)作为浮游动物大尺度调查的一部分，确定冬季/春季乔治河岸上Calanus、pseudoalanus和其他桡足类动物nauplii丰度的时空变化。(2)确定了黄鳝和拟黄鳝等优势桡足类产卵量、生长率、生理状况和死亡率的空间、季节和年际变化。(3)在4月下旬至5月初，在波峰-南侧潮汐混合锋的精细空间尺度上，确定目标桡足类物种的丰度、个体生长速率和生理状况，以及其他浮游动物物种的丰度。(4)为建模和合成组提供桡足动物分布、招募、生长和死亡率的数据。这个项目由四个独立的部分组成，它们被合并在一个提案中。这些组成部分是：(1)大尺度泵调查；(2)大尺度泵调查；(2)大尺度泵调查；(3)大尺度泵调查；(3)大尺度泵调查；(3)大尺度泵调查；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过程巡航期间进行，尽管大规模调查的雌性丰度数据将用于全银行的产蛋量估计。

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.