C. Barrier , S. Ternengo , O. El Idrissi , L. Piacentini , N. Barrier , C. Lett , V. Pasqualini , E.D.H. Durieux
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To investigate the trajectories of larval dispersal of this sea urchin in the Northwestern Mediterranean Sea, we combined a Lagrangian model (Ichthyop) with a hydrodynamic model (MARS3D). This study covered the years 2010–2018 and aimed to quantify the connectivity between the preferred habitats of the sea urchin (seagrasses and rocky substrates). The present study explores seasonal variations in dispersal routes and habitat connectivity relationships for two spawning scenarios identified in the literature (spring and autumn). The results enable us to identify dispersal routes, and their regularity over time. They highlight a consistent connection between Sardinia, Corsica, and the coastlines of the Ligurian and Tyrrhenian Seas, indicating a lack of genetic structuring within the edible sea urchin population in this area, particularly in Corsica. The connectivity matrices confirm the observed dispersal trajectories and highlight certain areas of significant and enduring local retention over time. The results also reveal minimal seasonal variability. Conversely, interannual variability appears pronounced, particularly in relation with trends in the warming of surface waters in the Mediterranean, which seem to impact the dispersal routes taken by <em>P. lividus</em> larvae. Lastly, a connectivity map was created to explore spatial resource management perspectives, aiming to identify frequent connections over an extended time period and assign varying levels of intensity to them. 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This study covered the years 2010–2018 and aimed to quantify the connectivity between the preferred habitats of the sea urchin (seagrasses and rocky substrates). The present study explores seasonal variations in dispersal routes and habitat connectivity relationships for two spawning scenarios identified in the literature (spring and autumn). The results enable us to identify dispersal routes, and their regularity over time. They highlight a consistent connection between Sardinia, Corsica, and the coastlines of the Ligurian and Tyrrhenian Seas, indicating a lack of genetic structuring within the edible sea urchin population in this area, particularly in Corsica. The connectivity matrices confirm the observed dispersal trajectories and highlight certain areas of significant and enduring local retention over time. The results also reveal minimal seasonal variability. 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引用次数: 0
摘要
由于地中海各国对食用海胆(Paracentrotus lividus)的需求量很大,因此食用海胆具有重要的经济意义。这种棘皮动物通过其吃草行为调节海藻和海草的动态,从而发挥着重要的生态作用。海胆的丰度在时间和空间上都是可变的,但目前在地中海可能正在减少,并可能受到全球变化的负面影响。因此,更全面地了解海胆幼虫在一个较长时期内的扩散模式,有助于我们了解海胆的动态与种群连通性之间的关系。为了研究地中海西北部海胆幼虫的扩散轨迹,我们将拉格朗日模型(Ichthyop)与水动力模型(MARS3D)相结合。该研究涵盖 2010-2018 年,旨在量化海胆偏好栖息地(海草和岩石底质)之间的连通性。本研究针对文献中确定的两种产卵情况(春季和秋季),探讨了扩散路线和栖息地连接关系的季节性变化。研究结果使我们能够确定散布路线及其随时间变化的规律性。它们强调了撒丁岛、科西嘉岛以及利古里亚海和第勒尼安海海岸线之间的连通性,表明该地区(尤其是科西嘉岛)的食用海胆种群缺乏遗传结构。连通性矩阵证实了观察到的扩散轨迹,并突出显示了某些地区随着时间的推移存在显著而持久的局部保留。研究结果还显示,季节变化极小。相反,年际变化似乎很明显,特别是与地中海表层水变暖的趋势有关,这似乎会影响到 P. lividus 幼虫的扩散路线。最后,我们绘制了一张连通性地图,以探索空间资源管理的前景,目的是确定在一个较长的时间段内经常发生的连通性,并为其分配不同程度的强度。这种方法可以为幼虫连接的不同沿海地区的资源管理问题提供指导。
Edible Sea urchin (Paracentrotus lividus) larval dispersal and connectivity modelling in the northwestern Mediterranean Sea
The edible sea urchin (Paracentrotus lividus) is of significant economic importance due to high demand for its consumption in various Mediterranean countries. This echinoderm plays a crucial ecological role by regulating the dynamics of seaweed and seagrass through its grazing behaviour. The abundance of sea urchin is variable in time and space, but it is currently potentially declining in the Mediterranean Sea, and likely to be negatively affected by global change. Therefore, gaining a more comprehensive understanding of sea urchin larval dispersal patterns over an extended period could contribute to our understanding of how their dynamics relate to population connectivity. To investigate the trajectories of larval dispersal of this sea urchin in the Northwestern Mediterranean Sea, we combined a Lagrangian model (Ichthyop) with a hydrodynamic model (MARS3D). This study covered the years 2010–2018 and aimed to quantify the connectivity between the preferred habitats of the sea urchin (seagrasses and rocky substrates). The present study explores seasonal variations in dispersal routes and habitat connectivity relationships for two spawning scenarios identified in the literature (spring and autumn). The results enable us to identify dispersal routes, and their regularity over time. They highlight a consistent connection between Sardinia, Corsica, and the coastlines of the Ligurian and Tyrrhenian Seas, indicating a lack of genetic structuring within the edible sea urchin population in this area, particularly in Corsica. The connectivity matrices confirm the observed dispersal trajectories and highlight certain areas of significant and enduring local retention over time. The results also reveal minimal seasonal variability. Conversely, interannual variability appears pronounced, particularly in relation with trends in the warming of surface waters in the Mediterranean, which seem to impact the dispersal routes taken by P. lividus larvae. Lastly, a connectivity map was created to explore spatial resource management perspectives, aiming to identify frequent connections over an extended time period and assign varying levels of intensity to them. This approach can provide guidance with regard to resource management issues for different coastal areas that can be connected by larvae.
期刊介绍:
The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.