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首页> 外文期刊>Ocean Dynamics >Modelling larval dispersal of the king scallop (Pecten maximus) in the English Channel: examples from the bay of Saint-Brieuc and the bay of Seine
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Modelling larval dispersal of the king scallop (Pecten maximus) in the English Channel: examples from the bay of Saint-Brieuc and the bay of Seine

机译：在英吉利海峡中模拟扇贝国王（Pecten maximus）的幼虫扩散：以圣布里厄湾和塞纳河湾为例

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The king scallop (Pecten maximus) is one of the most important benthic species of the English Channel as it constitutes the first fishery in terms of landings in this area. To support strategies of spatial fishery management, we develop a high-resolution biophysical model to study scallop dispersal in two bays along the French coasts of the English Channel (i.e. the bay of Saint-Brieuc and the bay of Seine) and to quantify the relative roles of local hydrodynamic processes, temperature-dependent planktonic larval duration (PLD) and active swimming behaviour (SB). The two bays are chosen for three reasons: (1) the distribution of the scallop stocks in these areas is well known from annual scallop stock surveys, (2) these two bays harbour important fisheries and (3) scallops in these two areas present some differences in terms of reproductive cycle and spawning duration. The English Channel currents and temperature are simulated for 10 years (2000–2010) with the MARS-3D code and then used by the Lagrangian module of MARS-3D to model the transport. Results were analysed in terms of larval distribution at settlement and connectivity rates. While larval transport in the two bays depended both on the tidal residual circulation and the wind-induced currents, the relative role of these two hydrodynamic processes varied among bays. In the bay of Saint-Brieuc, the main patterns of larval dispersal were due to tides, the wind being only a source of variability in the extent of larval patch and the local retention rate. Conversely, in the bay of Seine, wind-induced currents altered both the direction and the extent of larval transport. The main effect of a variable PLD in relation to the thermal history of each larva was to reduce the spread of dispersal and consequently increase the local retention by about 10 % on average. Although swimming behaviour could influence larval dispersal during the first days of the PLD when larvae are mainly located in surface waters, it has a minor role on larval distribution at settlement and retention rates. The analysis of the connectivity between subpopulations within each bay allows identifying the main sources of larvae which depend on both the characteristics of local hydrodynamics and the spatial heterogeneity in the reproductive outputs.
机译：扇贝国王（Pecten maximus）是英吉利海峡最重要的底栖物种之一，因为就该地区的着陆而言，它是第一批渔业。为了支持空间渔业管理策略，我们开发了高分辨率的生物物理模型来研究沿英吉利海峡法国海岸的两个海湾（即圣布里厄克海湾和塞纳河海湾）中的扇贝散布并量化相对水动力过程，温度依赖性浮游幼虫持续时间（PLD）和活跃游泳行为（SB）的作用。选择这两个海湾的原因有三个：（1）扇贝种群在年度扇贝种群调查中是众所周知的；（2）这两个海湾具有重要的渔业；（3）扇贝在这两个区域存在一些生殖周期和产卵持续时间方面的差异。使用MARS-3D代码模拟了10年（2000–2010）的英吉利海峡电流和温度，然后由MARS-3D的拉格朗日模块用于模拟运输。根据沉降和连通率下的幼虫分布对结果进行了分析。虽然两个海湾中的幼虫运输既取决于潮汐的剩余循环量，又取决于风流，但是这两个流体动力学过程的相对作用在两个海湾之间是不同的。在圣布里厄湾，幼虫扩散的主要模式是由于潮汐引起的，风只是幼虫斑块程度和局部滞留率变化的来源。相反，在塞纳河湾中，风流改变了幼体运输的方向和范围。与每个幼虫的热史相关的可变PLD的主要作用是减少分散的扩散，因此平均将本地保留率提高约10％。尽管在幼体主要位于地表水域的初期，游泳行为可能会影响幼体的扩散，但它对幼体在沉降和滞留率方面的分布影响较小。对每个海湾中亚种群之间的连通性进行分析，可以确定幼虫的主要来源，这些来源取决于当地水动力的特征和生殖输出中的空间异质性。

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