Disentangling density-dependent effects on egg production and survival from egg to recruitment in fish
Disentangling density-dependent effects on egg production and survival from egg to recruitment in fish
复制标题
解开密度依赖性对产蛋量和从卵到鱼补充存活的影响
DOI：
10.1111/faf.12381
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发表时间：
2019
影响因子：
6.7
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Takasuka;A.;Yoneda;M.;Oozeki;Y.
了解密度依赖效应是实现自我调节生物资源（如鱼类资源）可持续管理的关键。传统上，基于产卵种群生物量和总产蛋量之间的比例关系，密度依赖性对鱼类种群丰度的影响被认为发生在从孵化到招募的整个过程中。本文以沙丁鱼（Sardinops melanotictus, Clupeidae）和凤尾鱼（Engraulis japonicus, Engraulidae）为模型物种，研究了产蛋过程中种内和种间密度依赖的存在如何改变了目前对鱼类生活史中密度依赖过程的理解。对于沙丁鱼来说，产蛋过程中存在很强的种内密度依赖效应，但不存在密度依赖效应，或者即使存在密度依赖效应，也足以被从孵化到招募的环境因素所掩盖。相反，对于凤尾鱼，种间密度依赖效应发生在产卵中。在孵化后的生存中，凤尾鱼经历了比目前认识到的更强的种内密度依赖效应。这一分析可能推翻目前对生活史中密度依赖效应的理解，突出了个体质量和种群丰度以及模式物种之间的差异。我们建议基于对各自物种生活史中密度依赖效应的修订理解，重新考虑渔业管理和招募研究的基础。
Understanding of density‐dependent effects is key to achieving sustainable management of self‐regulating biological resources such as fish stocks. Traditionally, density‐dependent effects on population abundance in fish have been considered to occur from hatching to recruitment, based on the paradigm of proportionality between spawning stock biomass and total egg production. Here, we demonstrate how the existence of intraspecific and interspecific density dependence in egg production changes the current understanding of density‐dependent processes in the life history of fish, by disentangling density‐dependent effects on egg production and survival from egg to recruitment, using sardine (Sardinops melanostictus, Clupeidae) and anchovy (Engraulis japonicus, Engraulidae) as model species. For sardine, strong intraspecific density‐dependent effects occurred in egg production, but no density‐dependent effects occurred or if any they were weak enough to be masked by environmental factors from hatching to recruitment. In contrast, for anchovy, interspecific density‐dependent effects occurred in egg production. In the survival after hatching, anchovy experienced stronger intraspecific density‐dependent effects than currently recognized. This analysis could overturn the current understanding of density‐dependent effects in the life history, highlighting contrasts between the effects on individual quality and population abundance and between the model species. We propose to reconsider the basis of fisheries management and recruitment studies based on the revised understanding of density‐dependent effects in the life history of the respective species.