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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：稳定同位素分析表明，巴西热带河口的两种斯诺克鱼类（Centropomidae）的营养资源分配

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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：我们使用碳的稳定同位素分析（δC-13）调查了巴西东北部的四个热带河口的营养小生境和两种斯诺克物种（Centropomus undecimalis）和胖斯诺克（C. parallelus）的资源分配）和氮气（δN-15）。 2015年在所有河口的干燥和雨季期间收集了鱼类标本，主要是幼鱼，基础资源和主要消费者，这些标本在系统规模，地貌形态，出海通道和人为压力方面表现出差异。研究了鱼体长，河口和季节等因素对同位素比的潜在影响。无论种类如何，都发现鱼的大小和N-15值呈正相关。我们的结果表明，斯诺克犬可以被视为次要消费者，并且在大多数河口中都具有接近的营养位。在最大的河口（Catuama和圣克鲁斯）内，营养层的重叠更为明显，而与海洋的连接受到限制的较小系统在这两个物种之间（Suape和Sirinhaem）的同位素生态位重叠较低。此外，在较大的河口中，受到邻近沿海水域的较强影响，斯诺克地区的斯图克三角洲C-13和δN-15值变化较大。尽管我们无法检测到明显的季节性影响，但在雨季期间发现了更大的同位素重叠。尽管生活史特征缺乏内在差异，但在这些环境中，两种以幼虫为主的物种在营养方面也具有相似的优势。

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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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