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首页> 外文期刊>Estuarine Coastal and Shelf Science >Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis
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Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

机译：稳定同位素分析证明了巴西热带河口中两种怠速鱼类（Centropomidae）的营养资源分区

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摘要

We investigated the trophic niches and the resource partitioning of two snook species, the common (Centropomus undecimalis) and the fat snook (C. parallelus), in four tropical estuaries of the northeastern Brazil, using stable isotope analyses of carbon (delta C-13) and nitrogen (delta N-15). Fish specimens, mainly juveniles, basal resources and a primary consumer were collected in 2015 during dry and rainy seasons in all estuaries, which exhibited differences in system size, geomorphologic shapes, levels of sea access and anthropic pressures. Potential effect of factors like fish body length, estuary and seasonality on isotope ratios were investigated. Positive relationships between the size of fish and delta N-15 values were found, regardless the species. Our results indicated that snooks can be characterized as secondary consumers and have close trophic niches in most estuaries. Trophic overlaps were more pronounced within the largest estuaries (Catuama and Santa Cruz), whereas smaller systems that have restricted connections to the sea presented low isotopic niche overlap between both species (Suape and Sirinhaem). Moreover, a higher variability of delta C-13 and delta N-15 values in snooks was found in larger estuaries undergoing stronger influences from coastal adjacent waters. Although we were not able to detect clear seasonal effects, greater isotopic overlaps were found during the rainy season. Despite the lack of intrinsic differences in life history traits, both species, dominated by juveniles, shared similar trophic niches in these environments.
机译：我们调查了营养不良的利基和两种鼾声，共同的（Centropomus Undecimalis）和脂肪冲动（C.Parkstus）的资源分区，在巴西东北部的四个热带河口中，使用稳定的同位素分析（Delta C-13 ）和氮（δn-15）。在所有河口的干旱和雨季期间，2015年收集了鱼类，主要是青少年，基础资源和主要消费者，这表现出系统规模，地貌形状，海上接入水平和人类压力的差异。研究了鱼体长度，河口和同位素比率季节性等因素的潜在影响。无论物种如何，都会发现鱼和δn-15值之间的阳性关系。我们的结果表明，Snooks可以被称为二级消费者，并且在大多数河口中都有密切的营养利基。在最大的河口（Catuama和Santa Cruz）内更加明显的营养性重叠更加明显，而对海洋的限制的较小系统呈现出低同位素的利基重叠在两个种类（Suape和Sirinhaem）之间。此外，在沿海邻近水域的较强影响的较大影响的较大河口中发现了ΔC-13的更高可变性和斯诺克斯中的ΔN-15值。虽然我们无法检测到明确的季节性效果，但在雨季期间发现了更大的同位素重叠。尽管生活历史特征缺乏内在差异，但两种物种都被少年占据了少年，在这些环境中共享了类似的营养利用。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2019年第15期|106287.1-106287.11|共11页
  • 作者

    Gonzalez Julio Guazzelli; Menard Frederic; Le Loch Francois; de Andrade Humber Agrelli; Viana Andrea Pontes; Ferreira Valdimere; Fredou Flavia Lucena; Lira Alex Souza; Munaron Jean-Marie; Fredou Thierry;

  • 作者单位

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil;

    Aix Marseille Univ Univ Toulon CNRS IRD MIO UM110 Marseille France;

    IRD Lab Sci Environm Marin UMR 6539 CNRS UBO F-29280 Plouzane France;

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil;

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil|Univ Fed Oeste Para UFOPA Ave Mendonca Filho 2946 BR-68040050 Santarem PA Brazil;

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil;

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil;

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil;

    IRD Lab Sci Environm Marin UMR 6539 CNRS UBO F-29280 Plouzane France;

    Univ Fed Rural Pernambuco UFRPE Dept Recursos Pesqueiros & Aquicultura Rua Dom Manuel Medeiros S-N BR-52171900 Recife PE Brazil;

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  • 正文语种 eng
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  • 关键词

    Brackish water fish; Trophic relationships; Carbon; Nitrogen; Centropomus;

    机译：咸水鱼;营养不良关系;碳;氮;中心;

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