The selection process from larval to juvenile stages of anchovy (Engraulis encrasicolus) in the Bay of Biscay investigated by Lagrangian simulations and comparative otolith growth
The selection process from larval to juvenile stages of anchovy (Engraulis encrasicolus) in the Bay of Biscay investigated by Lagrangian simulations and comparative otolith growth
复制标题
DOI：
10.1046/j.1365-2419.2003.00245.x
复制
发表时间：
2003-09-01
影响因子：
2.6
通讯作者：
Lazure, P
中科院分区：
文献类型：
--
作者：
Allain, G;Petitgas, P;Lazure, P
使用耳石生长重复幼虫调查（5月至7月）和青少年调查（9月）在1999年进行的产卵和育苗场比斯开湾（东北大西洋）收集的数据之间的关系进行了调查的增长和生存。本文介绍了阅读的幼虫和少年耳石的方法，重建青少年和幼虫之间的空间和时间的对应关系，使用拉格朗日模拟，并比较重建的子队列之间的耳石生长率。每周在三维流体动力学模型的网格上释放虚拟浮标，并跟踪其轨迹。通过选择从其孵化周开始到采样日期采样位置最小距离结束的轨迹来确定个体的起源。选择具有相同时空来源的幼虫和青少年，并假定其属于相同的子队列。存活的青少年表现出更快的增长速度，在其幼虫期比池的幼虫，他们估计来自，这支持生长选择性生存的想法。讨论了其他解释（运输和齿轮选择）。在耳石生长模式的变化也表明了较高的少年增长比在海洋沃茨的货架休息。
The relation between growth and survival was investigated using the otolith growth data collected during repeated larval surveys ( May - July) and a juvenile survey ( September) undertaken in 1999 on anchovy spawning and nursery grounds in the Bay of Biscay ( NE Atlantic). The paper describes the methodology for reading the larval and juvenile otoliths, for reconstructing the correspondence in space and time between juveniles and larvae using Lagrangian simulations, and for comparing the otolith growth rates among the reconstructed sub-cohorts. Virtual buoys were released weekly on the grid of a three-dimensional hydrodynamic model and their trajectories were tracked. The origin of an individual was determined by selecting the trajectory beginning on its hatching week and ending at the minimum distance of its sampling location on the sampling date. Larvae and juveniles with the same spatio-temporal origin were selected and supposed to belong to the same sub-cohorts. The surviving juveniles showed faster growth rates during their larval period than the pool of larvae they were estimated to originate from, which supports the idea of growth-selective survival. Alternative interpretations ( transport and gear selectivity) are discussed. Variations in otolith growth pattern also suggest a higher juvenile growth over the shelf break than in oceanic waters.