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

小行星9521512 本计画为期五年，主要研究切萨皮克湾两种河口鱼类早期存活率与成长率之变异性。 在生命早期的过程中运作的假设，以产生招聘的变异性和波动的丰度，通常发生在海洋和河口鱼类种群。 研究的目的是确定时间和空间模式，以及鱼卵和仔鱼的存活率和生长率的变化尺度。 个体发育的作用和发展过程中特定阶段的生存趋势也将得到强调. 两个物种与对比的生活史，海湾Anchovy Anchoa mitchili和白色鲈鱼Morone美洲，将进行研究。 海湾鲈鱼产卵整个主流的切萨皮克湾，而产卵的白色鲈鱼仅限于潮汐支流。 因此，这两种物质的动力学分别取决于分散或保持机制。 将在当地和区域范围内调查早期生命阶段的动力学特性，并将详细研究特征和水文地理（例如锋面、最大浑浊带）如何影响生存潜力。 实地调查，漂流中生态系统，实验室实验，和基于个人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. ***