Growth, mortality, and recruitment of larval Morone spp. in relation to food availability and temperature in the Hudson River
Growth, mortality, and recruitment of larval Morone spp. in relation to food availability and temperature in the Hudson River
复制标题
莫罗尼属幼虫的生长、死亡率和招募。
DOI：
10.1007/s10228-005-0318-y
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发表时间：
1999
影响因子：
1.2
通讯作者：
K. Arend
中科院分区：
文献类型：
--
作者：
K. Limburg;M. Pace;K. Arend
我们测量了条纹鲈鱼（Morone saxatilis）和白鲈（M. ameri- cana）幼虫的年龄和生长情况，并测试了生长和存活是否与动物园浮游生物丰度较高的季节性脉冲（“开花”）有关。两种鱼类的生长速度在浮游动物繁殖前最低，繁殖后最高。招募潜能指数（瞬时生长率G除以瞬时死亡率Z）在条纹鲈鱼的情况下与水温或浮游动物丰度没有明显的关系，但在白鲈的情况下与这两个因素都有关系。从同一年班级招募的条纹鲈鱼幼鱼的孵化日期的回顾性分析表明，与幼虫群分布相比，较晚、生长较快的群体代表性不足，而与密度较高的支海浮游动物波斯米纳·弗莱共同出现的群体代表性过高。将这些结果与其他系统的类似分析进行比较表明，生物对年级强度的控制可能在物理因素相对较弱的河口系统中占主导地位（Hudson），但在那些具有高物理变异性的系统中可能起相对较小的作用。幼鸟孵化日期应反映不同的存活率（假设取样相等）。这些措施也可用于人口的重复抽样，以跟踪特定年龄组的增长和死亡率（例如每周队列）。这些基于队列的比率之间的关系可以根据诸如食物供应、捕食和物理化学环境等变量进行分析。我们之前的文献表明，在哈德逊河潮汐区，条纹鲈鱼（Morone saxa- tilis）和白鲈（M. ameri- cana）的幼虫与浮游动物增加之前的幼虫相比，显示出潜在的能量优势（Limburg et al., 1997）。初夏浮游动物的大量增加（“水华”）是哈德逊河口的一个主要特征。在水华之前出生的幼虫暴露在浮游动物密度稀疏和温度较低的环境中，这两者都与死亡风险有关(Rogers and Westin, 1981; Chesney，
We measured age and growth of larval striped bass (Morone saxatilis) and white perch (M. ameri- cana) and tested whether growth and survival were enhanced in relation to a seasonal pulse ("bloom") of high zoo- plankton abundance. Growth rates were lowest before the zooplankton bloom and highest afterwards for both fish species. An index of recruitment po- tential (instantaneous growth rate, G, divided by instantaneous mortality rate, Z) did not relate clearly to either water temperature or to zooplankton abundance in the case of striped bass but did relate to both factors for white perch. Retrospective analysis of hatch dates in recruited juvenile striped bass from the same year class indicated that later, faster growing cohorts were un- der-represented when compared to the larval cohort distribution, and that co- horts that co-occurred with high densi- ties of the cladoceran zooplankton Bosmina freyi were over-represented. Comparison of these results with simi- lar analyses from other systems sug- gests that biotic controls on year-class strength may predominate in estuarine systems where physical factors are rela- tively damped (Hudson) but may play relatively minor roles in those systems with high physical variability. venile hatch dates should reflect the differential survival (assuming ad- equate sampling). These measures can also be used with repeated sam- plings of the population to track the growth and mortality of specific age classes (e.g. weekly cohorts) over time. Relationships between these cohort-based rates can be analyzed with respect to variables such as food availability, predation, and the physicochemical environment. We previously documented that larval striped bass (Morone saxa- tilis) and white perch (M. ameri- cana), which co-occurred with in- creases in crustacean zooplankton in the tidal Hudson River, showed a potential energetic advantage compared with larvae that preceded the zooplankton increase (Limburg et al., 1997). A major increase ("bloom") in zooplankton in early summer is a key feature of the Hudson estuary. Larvae occurring before the bloom are exposed to sparse zooplankton densities and low temperature, both of which are associated with mortality risks (Rogers and Westin, 1981; Chesney,