Effects of Biotic and Abiotic Factors on Growth and Relative Survival of Young American Shad, Alosa sapidissima, in the Connecticut River
Effects of Biotic and Abiotic Factors on Growth and Relative Survival of Young American Shad, Alosa sapidissima, in the Connecticut River
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生物和非生物因素对康涅狄格河美国鲥鱼 (Alosa sapidissima) 生长和相对存活率的影响
DOI：
10.1139/f85-205
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发表时间：
1985
影响因子：
2.4
通讯作者：
T. Savoy
中科院分区：
文献类型：
--
作者：
V. Crecco;T. Savoy
在5 d队列中，我们检验了浮游动物丰度、河流流量和康涅狄格河温度的时间波动对美洲鲥鱼（Alosa sapidissima）幼虫和幼鱼的生存和生长速度的影响。在早期（5月21日~ 6月15日）的鱼群中，刚孵化的幼鱼和幼鱼的相对存活率较低，但在后期（6月21日~ 7月6日）的鱼群中，当河水流量低、温度高、浮游动物密度高时，幼鱼的相对存活率迅速上升。通过计算矢状耳石上的每日环数和通过反算技术确定的年龄特异性长度增量来估计幼鱼和幼鱼的年龄。幼鱼群体特异性生长率随浮游动物密度的增加而线性增加，随河流温度的升高和流量的减少而渐近增加。相比之下，在5 d队列中，幼鱼的生长速率与水温和流量没有显著的线性或非线性关系。
We examined the hypothesis that temporal oscillations in zooplankton abundance, river flows, and temperatures in the Connecticut River affect the survival and growth rates of larval and juvenile American shad, Alosa sapidissima, among 5-d cohorts. The relative survival rates between newly hatched shad larvae and juveniles were low among early cohorts (May 21 – June 15), but rose rapidly among later cohorts (June 21 – July 6) when river flows were low and temperatures and zooplankton densities were high. Age of larval and juvenile shad was estimated by counting daily rings on sagittal otoliths and age-specific length increments determined by backcalculation techniques. Cohort-specific growth rates of larval shad increased linearly with rising zooplankton densities, and asymptotically with rising river temperatures and declining flows. By contrast, juvenile growth rates among 5-d cohorts showed no significant linear or nonlinear relationships to water temperatures and flows.