Diel vertical migration and seamount stepping stones promote species connectivity from coastal to offshore insular systems in the Tropical Southwestern Atlantic

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Everton Giachini Tosetto, Christophe Lett, Sigrid Neumann-Leitão, Ariane Koch-Larrouy, Nicolas Barrier, Alex Costa da Silva, Julie Salvetat, Arnaud Bertrand
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Abstract

The recruitment of marine species in isolated oceanic island systems can be challenged by prevailing currents, as exemplified by the Tropical Southwestern Atlantic. In this region, the Fernando de Noronha ridge hosts several seamounts, the Rocas Atoll and the Fernando de Noronha Archipelago, which are home to great marine biodiversity. However, along the ridge, the central branch of the South Equatorial Current (cSEC), flowing westward, poses a challenge to the recruitment of organisms toward Fernando de Noronha. To unveil critical insights into the intricate processes shaping biodiversity in these insular ecosystems, we use a dispersal Lagrangian tool to explore the role of diel vertical migration (DVM) to depth strata influenced by the South Equatorial Undercurrent (SEUC), which flows eastward bellow the cSEC, in shaping species dispersal and metacommunity dynamics. Our results show that while not a direct journey, the DVM into SEUC-influenced strata increases the possibility that the seamounts and the Rocas Atoll act as stepping stones between the continental shelf and Fernando de Noronha. Propagules of organisms originating primarily from the continental shelf are transported to the western seamounts of the ridge. Upon reaching the western seamounts, organisms can find suitable habitats to recruit. The progeny of these communities that migrate to SEUC-influenced strata have the opportunity to reach suitable habitats at the Rocas Atoll and the Eastern seamounts, ultimately connecting to the Fernando de Noronha archipelago. These results provide scientific fundaments for the development of a functional network of marine protected areas in the Tropical Southwestern Atlantic.

Abstract Image

昼夜垂直迁移和海山阶石促进了热带西南大西洋沿海到近海岛屿系统的物种连通性
在孤立的大洋岛屿系统中,海洋物种的繁殖可能会受到盛行洋流的挑战,热带西南大西洋就是一个例子。在这一地区,费尔南多-德诺罗尼亚海脊上有几座海山、罗卡斯环礁和费尔南多-德诺罗尼亚群岛,是海洋生物多样性的家园。然而,沿着海脊向西流动的南赤道洋流(cSEC)中心支流对生物向费尔南多-德诺罗尼亚岛的迁移构成了挑战。为了揭示影响这些岛屿生态系统生物多样性的复杂过程,我们使用了一种扩散拉格朗日工具来探索受南赤道暗流(SEUC)影响的深度层的昼夜垂直迁移(DVM)在影响物种扩散和元群落动态中的作用。我们的研究结果表明,DVM 进入受 SEUC 影响的地层虽然不是一个直接的旅程,但却增加了海山和罗卡斯环礁作为大陆架和费尔南多-德诺罗尼亚之间的垫脚石的可能性。主要来自大陆架的生物繁殖体被运送到海脊的西部海山。到达西部海山后,生物可以找到合适的栖息地进行繁殖。迁移到受 SEUC 影响的地层的这些群落的后代有机会到达罗卡斯环礁和东部海山的合适栖息地,最终与费尔南多-德诺罗尼亚群岛相连接。这些结果为在热带西南大西洋建立海洋保护区功能网络提供了科学依据。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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