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

9806566Ohman美国GLOBEC第一阶段和第二阶段的结果表明，Finmarchicus和Pseudocalanus spp.的丰度和产量。乔治斯浅滩混合良好的浅水与东北峰顶和南翼较深的水域有很大的差异。Ohman博士及其同事提出，这种较小规模的时间和空间变异性由生命率(招募、生长和死亡)和GB上的额叶过程(汇聚、前线汇率)的变化控制。他们将通过以下具体目标解决这些问题：(1)作为浮游动物大范围调查的一部分，确定冬季/春季期间乔治斯岸上Calanus、Pseudocalanus和其他桡足类无节幼体的丰度的时空变化。(2)研究我国主要桡足类优势种--哲水蚤和伪足鼠的产卵量、生长率、生理状况和死亡率的空间、季节和年际变化。(3)在4月下旬至5月上旬，在细空间尺度上确定目标桡足类物种的丰度、个体生长速度和生理状况，以及其他浮游动物物种的丰度。(4)向模型组和综合组提供关于桡足类分布、补充、生长和死亡率的数据。这个项目由四个独立的组成部分组成，它们被合并到一个提案中。这些部分是：(1)大范围的抽水调查，(2)哲水鱼和伪足类的产卵率测量，(3)哲水鱼和伪足类的生长速度测量，(4)对哲水鱼和伪足鱼的卵和无节幼体死亡率的估计。抽水机调查将在每一次大范围调查巡航期间进行，后三部分将在每一次巡航过程中进行，尽管大范围调查雌性丰度数据将用于整个银行的鸡蛋产量估计。

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.