Evidence for resource partitioning in weakfishes from a coastal upwelling ecosystem

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science Pub Date : 2024-09-20 DOI:10.1016/j.rsma.2024.103829

Arthur B. Bauer , Nigel E. Hussey , Luciano G. Fischer

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引用次数: 0

Abstract

Resource partitioning plays an important role in supporting species coexistence. In a coastal upwelling ecosystem two weakfish species, Cynoscion guatucupa and C. jamaicensis co-occur and are key commercial species. The present study aimed to provide a comprehensive assessment of the feeding ecology of both species, including to; (i) quantitatively assess diet, (ii) evaluate ontogenetic and seasonal diet variations, and (iii) estimate dietary overlap in the context of competition or resource partitioning, using an integrated approach combining stomach content (SCA) and stable isotope analyses (SIA). Our results revealed that both C. guatucupa and C. jamaicensis prey mainly on pelagic fish and shrimp with ontogenetic and seasonal changes in diet detected. Weakfishes consume a large proportion of similar prey throughout the year and high isotopic niche overlap confirmed the SCA results. Despite the similar use of food resources by both species, the availability and abundance of prey promoted by seasonal upwellings and the possible spatial segregation between C. guatucupa and C. jamaicensis may promote their co-occurrence in an upwelling ecosystem. Due to their commercial value and fisheries importance in the southwestern Atlantic, these results contribute insights to support sustainable fisheries management.

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沿岸上升流生态系统中弱鱼类资源分配的证据

资源分配在支持物种共存方面发挥着重要作用。在一个沿岸上升流生态系统中，有两种弱鱼，Cynoscion guatucupa 和 C. jamaicensis，它们是主要的商业物种。本研究旨在采用胃内容物（SCA）和稳定同位素分析（SIA）相结合的综合方法，对这两个物种的摄食生态学进行全面评估，包括：（i）定量评估食性；（ii）评估本体和季节性食性变化；以及（iii）估计竞争或资源分配背景下的食性重叠。我们的研究结果表明，C. guatucupa和C. jamaicensis主要捕食中上层鱼类和虾类，并发现它们的食性随个体发育和季节而变化。弱鱼全年都会捕食大量相似的猎物，高度的同位素生态位重叠证实了 SCA 的结果。尽管两种鱼类对食物资源的利用相似，但季节性上升流促进了猎物的可获得性和丰度，以及C. guatucupa和C. jamaicensis之间可能存在的空间隔离，可能会促进它们在上升流生态系统中的共生。由于它们在西南大西洋的商业价值和渔业重要性，这些结果有助于支持可持续渔业管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Regional Studies in Marine Science Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

3.90

自引率

4.80%

发文量

336

审稿时长

69 days

期刊介绍： REGIONAL STUDIES IN MARINE SCIENCE will publish scientifically sound papers on regional aspects of maritime and marine resources in estuaries, coastal zones, continental shelf, the seas and oceans.