Linking ETM physics, zooplankton prey, and fish early-life histories to striped bass Morone saxatilis and white perch M. americana recruitment
Linking ETM physics, zooplankton prey, and fish early-life histories to striped bass Morone saxatilis and white perch M. americana recruitment
复制标题
将 ETM 物理、浮游动物猎物和鱼类早期生命史与条纹鲈 Morone saxatilis 和白鲈 M. americana 的招募联系起来
DOI：
10.3354/meps260219
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发表时间：
2003
影响因子：
2.5
通讯作者：
E. Houde
中科院分区：
文献类型：
--
作者：
E. North;E. Houde
在河口浊度最大（ETM）区域内的早期生活史阶段的运输和保留可能是溯河产卵的条纹鲈鱼Morone saxatilis和白色鲈鱼M的招募成功的重要组成部分。美国。在1998年5月3日和1999年5月2日的5次航行中，对切萨皮克湾河口上游的物理和生物特征进行了空间分辨调查，对这一假设进行了评价。在特定深度模式的幼虫丰度和浮游动物猎物的影响因素进行了评估，相对于盐度，温度和总悬浮固体（TSS）。虽然在河口上游的物理条件不同的邮轮和年，幼虫和潜在的猎物分布的空间格局是一致的，并跟踪盐锋和ETM位置的变化。统计分析表明，相对于ETM的位置解释了卵、卵黄囊幼虫和幼虫猎物浓度的显著变化，而猎物浓度解释了摄食幼虫浓度的显著变化。运输到ETM地区可能发生在鸡蛋（条纹鲈鱼）和卵黄囊幼虫（白色鲈鱼）阶段，并导致早期饲养幼虫在高猎物浓度区的保留。在ETM地区的物理条件显着不同之间的低淡水流量年（1999年）和高流量年（1998年），条纹鲈鱼和白色鲈鱼后卵黄囊幼虫的丰度显着低于1999年。招聘变异性与产卵种群生物量相关性较差，但产卵招聘模型，包括春季淡水流量解释了额外的41%（条纹鲈鱼）和30%（白色鲈鱼）的招聘变异。淡水流量的年度变化可以通过改变ETM区域的物理和生物特征来控制幼虫的存活和招募。
Transport to and retention of early-life history stages within the estuarine turbidity max- imum (ETM) region may be an important component of recruitment success of the anadromous striped bass Morone saxatilis and the white perch M. americana. This hypothesis was evaluated with spatially resolved surveys of the physical and biological characteristics of the upper Chesapeake Bay estuary during 5 cruises, 3 in May 1998 and 2 in May 1999. Gradients in depth-specific patterns of larval abundance and zooplankton prey were evaluated with respect to salinity, temperature and total suspended solids (TSS). Although physical conditions in the upper estuary differed between cruises and years, the spatial patterns in distribution of larvae and potential prey were consistent and tracked changes in salt front and ETM locations. A statistical analysis suggested that location relative to the ETM explained a significant amount of variability in concentrations of eggs, yolk-sac larvae, and larval prey, and that prey concentrations accounted for a significant amount of variability in con- centrations of feeding larvae. Transport to the ETM region probably occurs during the egg (striped bass) and yolk-sac larva (white perch) stages and results in retention of early-stage feeding larvae in a zone of high prey concentrations. Physical conditions in the ETM region differed markedly between a low freshwater-flow year (1999) and a high flow year (1998), and abundances of striped bass and white perch post-yolk-sac larvae were significantly lower in 1999. Recruitment variability was poorly correlated with spawning stock biomass, but spawner-recruitment models that incorporated spring freshwater discharge explained an additional 41% (striped bass) and 30% (white perch) of the variability in recruitment. Annual changes in freshwater flow could control larval survival and recruitment by modifying the physical and biological characteristics of the ETM region.