Inter and intra-estuary variability in ingress, condition and settlement of the American eel Anguilla rostrata: implications for estimating and understanding recruitment.
Inter and intra-estuary variability in ingress, condition and settlement of the American eel Anguilla rostrata: implications for estimating and understanding recruitment.
复制标题
美洲鳗鲡的进入、状况和定居的河口间和河口内变化：对估计和理解补充的影响。
DOI：
10.1111/j.1095-8649.2009.02252.x
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发表时间：
2009
影响因子：
2
通讯作者：
K. Able
中科院分区：
文献类型：
--
作者：
M. Sullivan;M. Wuenschel;K. Able
这项研究的目的是量化鳗鱼在相邻流域内和相邻流域之间的空间和时间变异性，以帮助阐明调节年度补充的机制。由于单一固定地点经常被用来评估年度招聘，跨多个地点的年度内招聘动态往往仍未得到解决。为了解决这个问题，每周部署浮游生物网和鳗鱼收集器，在一个入境季节对新泽西州两个河口12个地点的早期鳗鱼轮虫丰度进行概括性量化。在入海口收集的早期玻璃鳗的数量随着时间的推移在河口内和河口之间有适度的变化，并表明月相和水温之间存在微弱的相关性。玻璃鳗的相对状况虽然变化很大，但在进入季节后显著下降，并表明较低的状况有在下河口定居的趋势。从收集者那里获取的玻璃鳗鱼和早期鳗鱼的累积(每个收集者1到1500个轮虫)在河口下部的位置随时间变化很大，在河口之间只产生微弱的相关性。相比之下，后期鳗鱼的发育，加上上游地点的大规模殖民，在河口之间和河口内高度同步，取决于水温达到约10-12摄氏度。在进入季节的平均情况下，跨河口的成对地点之间的丰度估计非常一致，表明河口间的变异性程度很低。然而，在一个河口内，丰度估计因所处位置的不同而有很大差异。这些结果和方法对于早期鳗鱼调查的规划和解释以及对入口的动态性质和不同招募的空间尺度的理解具有重要意义。
The objective of this study was to quantify spatial and temporal variability of anguillid glass eel ingress within and between adjacent watersheds in order to help illuminate the mechanisms moderating annual recruitment. Because single fixed locations are often used to assess annual recruitment, the intra-annual dynamics of ingress across multiple sites often remains unresolved. To address this question, plankton nets and eel collectors were deployed weekly to synoptically quantify early stage Anguilla rostrata abundance at 12 sites across two New Jersey estuaries over an ingress season. Numbers of early-stage glass eels collected at the inlet mouths were moderately variable within and between estuaries over time and showed evidence for weak lunar phase and water temperature correlations. The relative condition of glass eels, although highly variable, declined significantly over the ingress season and indicated a tendency for lower condition A. rostrata to colonize sites in the lower estuary. Accumulations of glass eels and early-stage elvers retrieved from collectors (one to >1500 A. rostrata per collector) at lower estuary sites were highly variable over time, producing only weak correlations between estuaries. By way of contrast, development into late-stage elvers, coupled with the large-scale colonization of up-river sites, was highly synchronized between and within estuaries and contingent on water temperatures reaching c. 10-12 degrees C. Averaged over the ingress season, abundance estimates were remarkably consistent between paired sites across estuaries, indicating a low degree of interestuary variability. Within an estuary, however, abundance estimates varied considerably depending on location. These results and methodology have important implications for the planning and interpretation of early-stage anguillid eel surveys as well as the understanding of the dynamic nature of ingress and the spatial scales over which recruitment varies.
影响因子：
3.3
作者：
Kim, Heeyong;Kimura, Shingo;Sasaki, Hideharu
通讯作者：
Sasaki, Hideharu