Implications of spawning migration patterns of the giant mud crab Scylla serrata (Forskål, 1775) on opportunities for larval dispersal

IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Estuarine Coastal and Shelf Science Pub Date : 2024-10-29 DOI:10.1016/j.ecss.2024.109008
William Dantas Charles , Christopher Aiken , Julie Robins , Adam Barnett , Nicole Flint
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Abstract

Connectivity is an essential driver for aquatic species distribution, genetic variability and stock structure. The giant mud crab (Scylla serrata) is a coastal portunid commonly associated with estuaries and mangrove systems. This species has been observed to undertake a seaward spawning migration, as the larval development is known to be more successful under the stable environmental conditions typically found in marine waters. The larvae return to the coastal areas through advection, where they are recruited and enter the estuaries after metamorphosing into the first instar. Here, we used numerical modelling to test hypotheses regarding probabilities of larval settlement of the giant mud crab and the effect of the distance offshore from which females release the eggs. Our scenarios considered the biological characteristics of larvae and oceanographic conditions for six locations for mud crabs along a complex coastline - the Queensland east coast, Australia. The models suggest that all locations tend to self-supply, and to exchange mud crab larvae with other regions, but in different magnitudes. The spawning distance offshore considerably affects larval distribution and settlement. The main drivers for larval advection in areas within the continental shelf are wind patterns and coastal currents, while offshore along the Australian continental slope, the main drivers are ocean currents. Self-recruitment is predominant, although we also observed a significant degree of connectivity between each location and the surrounding coastline. Short spawning migrations benefit self-recruitment in all scenarios, but long offshore migrations favour connectivity among different locations. This source/sink balance seems to depend on the local oceanographic features. Nevertheless, offshore spawning by the giant mud crab has the potential to provide for successful recruitment in a variety of environmental contexts. This study provides novel predictions of the probabilities of larval settlement for mud crab populations considering ocean advection that can be applied to different contexts.

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大泥蟹(Scylla serrata)(Forskål,1775 年)产卵迁移模式对幼虫扩散机会的影响
连通性是水生物种分布、遗传变异和种群结构的重要驱动力。大泥蟹(Scylla serrata)是一种常见于河口和红树林系统的沿海梭子蟹。据观察,该物种进行向海产卵洄游,因为众所周知,在海洋水域通常稳定的环境条件下,幼体发育更为成功。幼体通过平流返回沿海地区,在那里被招募,变态为第一龄幼体后进入河口。在这里,我们利用数值模拟来检验有关大泥蟹幼体沉降概率的假设,以及雌蟹离岸产卵距离的影响。我们的方案考虑了幼体的生物学特征和澳大利亚昆士兰东海岸六个地点的海洋条件。模型表明,所有地点都倾向于自给自足,并与其他地区交换泥蟹幼体,但交换的程度不同。离岸产卵距离在很大程度上影响着幼体的分布和定居。风型和沿岸流是大陆架内地区幼体移动的主要驱动力,而沿澳大利亚大陆坡的近海地区,主要驱动力是洋流。虽然我们也观察到每个地点与周围海岸线之间存在着很大程度的联系,但自我招募占主导地位。在所有情况下,短时间的产卵洄游都有利于自我招募,但长时间的离岸洄游则有利于不同地点之间的联系。这种源/汇平衡似乎取决于当地的海洋特征。尽管如此,巨型泥蟹的离岸产卵有可能在各种环境条件下为成功招募提供条件。考虑到海洋平流,本研究对泥蟹种群幼体定居的概率进行了新的预测,并可应用于不同的环境。
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来源期刊
CiteScore
5.60
自引率
7.10%
发文量
374
审稿时长
9 months
期刊介绍: Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.
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