High-salinity water use of euryhaline catfish Genidens genidens revealed by otolith microchemistry

IF 1.6 4区环境科学与生态学 Q3 ECOLOGY Austral Ecology Pub Date : 2024-07-26 DOI:10.1111/aec.13573

Thaís Rodrigues Maciel, Enzo Moreno, Barbara Maichak de Carvalho, Nathan Miller, Marcelo Vianna, Esteban Avigliano

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Abstract

Migratory patterns of the catfish Genidens genidens in four estuaries along the Brazilian Atlantic coast are reconstructed from otolith Sr/Ca, a salinity proxy, to test estuarine-dependency. To facilitate interpretation of this proxy in otolith core-to-edge profiles, a Sr/Ca Reference Value for High Salinity (RVHS_Sr/Ca) of 4.88 mmol/mol was established experimentally, from fish specimens reared in water with a salinity level (33 psu) between estuarine and high salinity (marine) water. All wild specimens exhibited otolith Sr/Ca values higher than RVHS_Sr/Ca, suggesting that G. genidens utilizes environments with marine salinity. Our results reveal highly variable environmental histories, with at least five major habitat usage patterns. Most distinctive among these, we find that (a) fish from Paranaguá Estuarine Complex (PEC) exhibit high intraindividual heterogeneity; (b) most fish (57%) from Guanabara Bay (GB) exhibit prolonged exposure to very high salinities, often exceeding 36.5 psu levels found in some shelf sectors; and (c) some fish from Paraiba do Sul River, GB and PEC exhibit Sr/Ca values below RVHS_Sr/Ca consistent with estuarine residence. These results suggest that G. genidens is not strictly estuarine-dependent.

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通过耳石微化学揭示极卤鲶鱼 Genidens genidens 对高盐度水的利用

根据耳石 Sr/Ca（一种盐度替代值）重建了巴西大西洋沿岸四个河口的鲶鱼 Genidens genidens 的洄游模式，以检验河口依赖性。为便于解释耳石核心到边缘剖面中的这一替代值，通过实验从在盐度水平（33 psu）介于河口水和高盐度（海洋水）之间的水中饲养的鱼类标本中建立了 4.88 mmol/mol 的 Sr/Ca 高盐度参考值（RVHSSr/Ca）。所有野生标本的耳石 Sr/Ca 值都高于 RVHSSr/Ca，这表明 G. genidens 利用的是海洋盐度环境。我们的研究结果揭示了高度多变的环境历史，至少有五种主要的栖息地使用模式。其中最独特的是，我们发现：（a）来自巴拉那瓜河口复合生态系统（PEC）的鱼类表现出高度的个体内异质性；（b）来自瓜纳巴拉湾（GB）的大多数鱼类（57%）表现出长期暴露在非常高的盐度下，通常超过某些陆架区域的 36.5 psu 水平；以及（c）来自南帕拉伊巴河、GB 和 PEC 的一些鱼类表现出低于 RVHSSr/Ca 的 Sr/Ca 值，这与河口栖息地一致。这些结果表明，G. genidens 并不完全依赖河口。

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来源期刊

Austral Ecology 环境科学-生态学

CiteScore

2.90

自引率

6.70%

发文量

117

审稿时长

12-24 weeks

期刊介绍： Austral Ecology is the premier journal for basic and applied ecology in the Southern Hemisphere. As the official Journal of The Ecological Society of Australia (ESA), Austral Ecology addresses the commonality between ecosystems in Australia and many parts of southern Africa, South America, New Zealand and Oceania. For example many species in the unique biotas of these regions share common Gondwana ancestors. ESA''s aim is to publish innovative research to encourage the sharing of information and experiences that enrich the understanding of the ecology of the Southern Hemisphere. Austral Ecology involves an editorial board with representatives from Australia, South Africa, New Zealand, Brazil and Argentina. These representatives provide expert opinions, access to qualified reviewers and act as a focus for attracting a wide range of contributions from countries across the region. Austral Ecology publishes original papers describing experimental, observational or theoretical studies on terrestrial, marine or freshwater systems, which are considered without taxonomic bias. Special thematic issues are published regularly, including symposia on the ecology of estuaries and soft sediment habitats, freshwater systems and coral reef fish.