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首页> 外文期刊>Marine biology >Food webs supporting fish over subtropical mudflats are based on transported organic matter not in situ microalgae
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Food webs supporting fish over subtropical mudflats are based on transported organic matter not in situ microalgae

机译：在亚热带泥滩上支撑鱼类的食物网是基于运输的有机物而非原位微藻

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摘要

We tested the importance of in situm icro-phytobenthos (MPB) and transported material (seagrass, seagrass epiphytic algae, mangroves, saltmarsh succulents and saltmarsh grass in adjacent habitats) as ultimate sources of carbon to fish caught over mudflats. We measured δ~(13)C values of these 6 autotrophs and 22 fish species in the subtropical waters of Moreton Bay, Queensland, Australia. All fish δ~(13)C values lay in the enriched half of the range for autotrophs. We modelled the distribution of feasible contributions of each autotroph to fishes, and then pooled the contributions for autotrophs with similar isotope values. Carbon from the suite of autotrophs having enriched isotope values (seagrass, epiphytes, saltmarsh grass) provided much of the carbon to fishes: 90-100% of carbon for 3 species, 70-90% for 13 species, and 50-70% for 5 species. For the one other species, the contribution of these autotrophs was lower (30-50%), and for this species the contribution of in situ MPB might be as much as about 50%. We could not, however, separate the MPB contribution from that of mangroves and saltmarsh succulents, which was also low for most species. Organic matter from seagrass meadows is clearly important at the base of food webs for fish on adjacent unvegetated mudflats. We are uncertain whether the apparent contribution of saltmarsh grass is real or a spurious result due to the similarity in isotope values of this autotroph and seagrass. This suite of fish caught over mudflats is supported by food webs relying predominantly on carbon from adjacent habitats and not in situ MPB.
机译：我们测试了在种植环境中，作为环境中碳的最终来源的重要性，其中的环境是植物中的古细菌底栖动物（MPB）和运输的物质（海草，海草附生藻类，红树林，盐沼肉质植物和盐沼草）。我们在澳大利亚昆士兰州莫顿湾亚热带水域中测量了这6种自养生物和22种鱼类的δ〜（13）C值。所有鱼类的δ〜（13）C值都位于自养生物范围的一半。我们对每个自养生物对鱼类的可行贡献进行了建模，然后汇总了具有相似同位素值的自养生物的贡献。来自具有丰富同位素值（海草，附生植物，盐沼草）的自养生物套件中的碳为鱼类提供了大部分碳：3种物种中90％至100％的碳，13种物种70％至90％的碳和50％至70％的碳。 5种。对于另一个物种，这些自养生物的贡献较低（30-50％），而对于这个物种，原位MPB的贡献可能高达约50％。但是，我们无法将MPB的贡献与红树林和盐沼多肉植物的贡献分开，后者对大多数物种而言也很低。海藻草地上的有机物显然是相邻无植被泥滩上鱼类食物网的基础。由于这种自养生物与海草的同位素值相似，我们不确定盐沼草的表观贡献是真实的还是虚假的结果。覆盖在滩涂上的这组鱼得到食物网的支持，食物网主要依靠来自相邻生境而不是原位MPB的碳。

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  • 来源
    《Marine biology》 |2005年第2期|p.363-371|共9页
  • 作者

    Andrew J. Melville; Rod M. Connolly;

  • 作者单位

    Centre for Aquatic Processes & Pollution, and School of Environmental & Applied Sciences, Griffith University, PMB 50, Gold Coast Mail Centre, QLD, 9726 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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