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首页> 外文期刊>Estuarine Coastal and Shelf Science >Identification of trophic interactions within an estuarine food web (northern New Zealand) using fatty acid biomarkers and stable isotopes
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Identification of trophic interactions within an estuarine food web (northern New Zealand) using fatty acid biomarkers and stable isotopes

机译：使用脂肪酸生物标记物和稳定同位素鉴定河口食物网（新西兰北部）内的营养相互作用

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Fatty acid biomarkers and stable isotope signatures were used to identify the trophic dynamics of a mangrove/seagrass estuarine food web at Matapouri, northern New Zealand. Specific fatty acids were used to identify the preferred food sources (i.e., mangroves, seagrass, phytoplank-ton, macroalgae, bacteria, and zooplankton) of dominant fauna (i.e., filter feeders, grazing snails, scavenger/predatory snails, shrimp, crabs, and fish), and their presence in water and sediment samples throughout the estuary. The diets of filter feeders were found to be dominated by di-noflagellates, whereas grazers showed a higher diatom contribution. Bacteria associated with organic debris on surface sediments and brown algal (Hormosira banksii) material in the form of suspended organic matter also accounted for a high proportion of most animal diets. Animals within higher trophic levels had diverse fatty acid profiles, revealing their varied feeding strategies and carbon sources. The stable isotope (δ~(13)C and δ~(15)N) analyses of major primary producers and consumers/predators revealed a trend of ~(15)N enrichment with increasing trophic level, while δ~(13)C values provided a generally good description of carbon flow through the food web. Overall results from both fatty acid profiles and stable isotopes indicate that a variety of carbon sources with a range of trophic pathways typify this food web. Moreover, none of the animals studied was dependent on a single food source. This study is the first to use a comprehensive fatty acid biomarker and stable isotope approach to investigate the food web dynamics within a New Zealand temperate mangrove/seagrass estuary. This quantitative research may contribute to the currently developing management strategies for estuaries in northern New Zealand, especially for those perceived to have expanding mangrove fringes.
机译：脂肪酸生物标志物和稳定的同位素特征被用于确定新西兰北部马塔普里的红树林/海草河口食物网的营养动力学。使用特定的脂肪酸来识别优势动物（例如滤食动物，放牧蜗牛，清除剂/掠食性蜗牛，虾，蟹，虾，蟹，虾等）的首选食物来源（即红树林，海草，浮游植物，大型藻类，细菌和浮游动物）。和鱼类），以及它们在整个河口的水和沉积物样本中的存在。发现过滤喂食器的饮食以双鞭毛虫为主，而放牧者显示出较高的硅藻贡献。在大多数动物饲料中，与表面沉积物上的有机碎片相关的细菌和悬浮有机物形式的褐藻（Hormosira bankii）材料也占很大比例。营养水平较高的动物具有不同的脂肪酸谱，揭示了其不同的喂养策略和碳源。主要初级生产者和消费者/捕食者的稳定同位素（δ〜（13）C和δ〜（15）N）分析显示，随着营养级增加，〜（15）N富集趋势增加，而δ〜（13）C值增加提供了对通过食物网的碳流的总体描述。脂肪酸谱和稳定同位素的总体结果表明，具有各种营养途径的多种碳源是该食物网的典型代表。此外，所研究的动物均不依赖单一食物来源。这项研究是首次使用全面的脂肪酸生物标记物和稳定同位素方法研究新西兰温带红树林/海草河口内食物网的动态。这项定量研究可能有助于当前正在制定的新西兰北部河口管理战略，特别是对于那些认为红树林边缘正在扩大的河口管理战略。

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