Large-scale connectivity of the sandy beach clam Mesodesma mactroides along the Atlantic coast of South America, and climate change implications
Large-scale connectivity of the sandy beach clam Mesodesma mactroides along the Atlantic coast of South America, and climate change implications
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DOI：
10.1016/j.marenvres.2022.105591
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发表时间：
2022-03-05
影响因子：
3.3
通讯作者：
Defeo，Omar
中科院分区：
文献类型：
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作者：
Meerhoff，Erika;Combes，Vincent;Defeo，Omar
黄色的蛤蜊Mesodesma mactroidesis是一种冷水物种，代表西南大西洋（SAO）的桑迪，它是海洋变暖最严重的热点之一。该地区受拉普拉塔河（RdlP）的影响，这是一个限制其幼虫交换的动物地理障碍。我们调查了黄蛤幼虫的连接模式，使用个人为基础的模型（IBM）。IBM将3D流体动力学模型的输出与蛤子模型相结合，该模型考虑了盐度和温度对浮游幼虫死亡率的影响。整个RdlP河口的连接只发生在春季释放的幼虫在一个强大的拉尼娜事件。死亡率由于淡水排除幼虫运输整个RdlP，而幼虫死亡率由温暖的沃茨减少连接，导致自我招聘在大多数地区。这个热点的变暖加速可能会进一步限制SAO种群之间的幼虫连接，对这一受威胁的物种产生保护影响。
The yellow clamMesodesma mactroidesis a cool-water species that typifies sandy beaches of the Southwestern Atlantic Ocean (SAO), which embraces one of the strongest ocean warming hotspots. The region is influenced by the Rio de la Plata (RdlP), which represents a zoogeographic barrier that restricts its larval exchange. We investigated yellow clam larval connectivity patterns using an individual based model (IBM). The IBM combined outputs from a 3D hydrodynamic model with a clam submodel that considered salinity- and temperature-dependent mortality for the planktonic larvae. Connectivity across the RdlP estuary occurred only for larvae released in spring during a strong La Niña event. Mortality due to freshwater precluded larval transport across the RdlP, whereas larval mortality induced by warmer waters reduced connectivity, leading to self-recruitment in most areas. Warming acceleration in this hotspot could further restrict larval connectivity between populations in the SAO, with conservation implications for this threatened species.