Recruitment Processes in Estuarine Fishes: Pattern, Scale, and Ontogenetic Trends

这个项目是一个为期五年的项目，旨在调查切萨皮克湾两种河口鱼类早期生存和生长速率的变化。据推测，在生命早期发生的过程产生了通常发生在海洋和河口鱼类种群中的补充变异和丰度波动。研究的目的是确定鱼卵和幼虫的生存和生长速率的时空格局和变异尺度。在发展过程中个体发生的作用和发展趋势也将被强调。将研究两种生活史截然不同的物种，湾凤尾鱼和美洲白鲈。海湾凤尾鱼在切萨皮克湾的主流水域产卵，而白鲈的产卵则局限于潮汐支流。因此，这两个物种的动力学分别依赖于分散或保留机制。生命早期阶段的动力学特性将在局部和区域尺度上进行调查，并将包括对地形和水文（例如锋面，最大浊度带）如何影响生存潜力的详细检查。野外调查、漂流中观、实验室实验和基于个体的建模方法都将包括在内。＊＊＊

9521512 Houde This project is a five-year program to investigate variability in survival and growth rates during the early lives of two species of estuarine fishes in Chesapeake Bay. Processes operating during early life are hypothesized to generate recruitment variability and the fluctuations in abundance that typically occur in marine and estuarine fish stocks. Objectives of the research are to determine the temporal and spatial patterns, and the scales of variability in survival and growth rates of fish eggs and larvae. The role of ontogeny and trends in stage- specific survivorship during development also will be emphasized. Two species with contrasting life histories, the bay anchovy Anchoa mitchilli and the white perch Morone Americana, will be studied. Bay anchovy spawns throughout the mainstream of the Chesapeake Bay, while spawning by white perch is confined to tidal tributaries. consequently, the dynamics of the two species are dependent upon dispersive or retentive mechanisms, respectively. The dynamics properties of early life stages will be investigated at local and regional scales, and will include detailed examination of how features and hydrography (e.g. fronts, maximum turbidity zone) affect potential for survival. Field surveys, drifting mesocosms, laboratory experiments, and individual-based modeling approaches all will be included. ***