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首页> 外文期刊>Estuarine Coastal and Shelf Science >Nutritional support of estuary perch (Macquaria colonorum) in a temperate Australian inlet: Evaluating the relative importance of invasive Spartina
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Nutritional support of estuary perch (Macquaria colonorum) in a temperate Australian inlet: Evaluating the relative importance of invasive Spartina

机译：温带澳大利亚入口的河口鲈（Macquaria Colonorum）的营养支持：评估侵袭性斯巴特那粉的相对重要性

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摘要

The invasive saltmarsh grass Spartina is widely considered a threat to the health of coastal ecosystems in south-eastern Australia, however, the ecological impacts of Spartina on estuarine communities are poorly understood. The largest infestation of Spartina in Victoria occurs in Anderson Inlet. The relative contribution of Spartina, vs. non-invasive autotrophs, to the nutrition of an estuarine fish, Macquaria colonorum was assessed using stable isotopes and gut content analyses. The δ~(13)C and δ~ (15)N compositions of autotrophs and M. colonorum varied spatially across the study area. Based on gut content analyses, adults and juveniles were between two and three trophic levels above autotrophs. Isosource modelling of δ~(13)C signatures, suggested several autotrophs contributed to the nutrition of M. colonorum with a combination of seagrass and Spartina likely important contributors, particularly for adults. Isotopic sulphur was subsequently used to distinguish between seagrass and Spartina. Modelling of δ~~(13)C and δ~(34)S signatures of M. colonorum and a subset of autotrophs again indicated a combination of seagrass and Spartina was likely a major contributor to nutritional support of M. colonorum. Given the limited areal extent of seagrass within Anderson Inlet, current Spartina eradication programs may compromise the nutritional support of M. colonorum.
机译：入侵性盐沼草Spartina被广泛认为是对澳大利亚东南部沿海生态系统健康的威胁，但是，人们对Spartina对河口群落的生态影响知之甚少。维多利亚州的斯巴迪娜（Spartina）侵扰最大，发生在安德森（Anderson）入口。使用稳定的同位素和肠道含量分析法评估了斯巴达纳与无创自养生物相对于河口鱼类Macquaria Colonorum营养的相对贡献。在整个研究区域中，自养生物和结肠粘菌的δ〜（13）C和δ〜（15）N组成在空间上变化。根据肠道含量分析，成年和少年的营养水平高于自养生物。 δ〜（13）C标记的等源模型表明，几种自养生物结合了海草和斯巴达（Spartina）可能是重要的贡献者，特别是对成年人而言，对结肠分支杆菌的营养做出了贡献。后来用同位素硫来区分海草和斯巴达纳。对结肠念珠菌的δ~~（13）C和δ〜（34）S签名以及部分自养生物的建模再次表明，海草和斯巴达虫的组合可能是结肠念珠菌的营养支持的主要贡献者。鉴于安德森湾内海草的面积有限，目前的斯巴蒂娜根除计划可能会损害结肠支原体的营养支持。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第3期|p.159-167|共9页
  • 作者

    J.S. Hindell; F.Y. Warry;

  • 作者单位

    Arthur Rylah Institute for Environmental Research, Department of Sustainability and Environment, P.O. Box 137, Heidelberg, Victoria 3084, Australia,Department of Zoology, University of Melbourne, Parkville 3010, Australia;

    rnArthur Rylah Institute for Environmental Research, Department of Sustainability and Environment, P.O. Box 137, Heidelberg, Victoria 3084, Australia,Department of Zoology, University of Melbourne, Parkville 3010, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    food webs; estuaries; stable isotope; seagrass; victoria; anderson inlet;

    机译：食物网;河口稳定同位素海草维多利亚安德森入口;

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