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首页> 外文期刊>Estuarine Coastal and Shelf Science >Food web structure in a near-pristine mangrove area of the Australian Wet Tropics
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Food web structure in a near-pristine mangrove area of the Australian Wet Tropics

机译：澳大利亚湿热带近原始红树林地区的食物网结构

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Carbon and nitrogen isotopic composition was used to identify the main sources of carbon and describe the main trophic pathways in Deluge Inlet, a near-pristine mangrove estuary in tropical north Queensland, Australia. Producers' δ~(13)C varied from -28.9‰ for mangroves to -18.6‰ for seagrass. Animals were also well separated in δ~(13)C (-25.4‰ to -16.3‰ for invertebrates and -25.2‰ to -17.2‰ for fish), suggesting considerable differences in ultimate sources of carbon, from a substantial reliance on mangrove carbon to an almost exclusive reliance on seagrass. In general, invertebrates had lower δ~(15)N than fish, indicating lower trophic levels. Among fish, δ~(15)N values reflected well the assumed trophic levels, as species from lower trophic levels had lower δ~(15)N than species from higher trophic levels. Trophic levels and trophic length were estimated based on δ~(15)N of invertebrate primary consumers (6.1‰), with results suggesting a food web with four trophic levels. There was also evidence of a high level of diet overlap between fish species, as indicated by similarities in δ~(13)C for fish species of higher trophic levels. Stable isotope data was also useful to construct a general model for this food web, where five main trophic pathways were identified: one based on both mangrove and microphytobenthos, one on plankton, two on both microphytobenthos and seagrass, and one based mainly on seagrass. This model again suggested the presence of four trophic levels, in agreement with the value calculated based on the difference in δ~(15)N between invertebrate primary consumers and top piscivores.
机译：碳和氮的同位素组成用于识别碳的主要来源，并描述了澳大利亚昆士兰州北部热带地区近原始的红树林河口Deluge Inlet的主要营养途径。生产者的δ〜（13）C从红树林的-28.9‰到海草的-18.6‰不等。动物在δ〜（13）C中也被很好地分离（无脊椎动物为-25.4‰至-16.3‰，鱼类为-25.2‰至-17.2‰），这表明由于对红树林碳的高度依赖，最终碳源存在很大差异。几乎完全依赖海草。通常，无脊椎动物的δ〜（15）N比鱼类低，表明营养水平较低。在鱼类中，δ〜（15）N值很好地反映了假定的营养水平，因为营养水平较低的物种比营养水平较高的物种具有较低的δ〜（15）N。根据无脊椎动物主要消费者的δ〜（15）N（6.1‰）估算营养水平和营养长度，结果表明食物网具有四个营养水平。也有证据表明，鱼类之间的饮食重叠水平很高，营养水平较高的鱼类的δ〜（13）C相似性表明。稳定的同位素数据对于构建该食物网的通用模型也很有用，其中确定了五个主要的营养途径：一个基于红树林和微底栖动物，一个基于浮游生物，两个基于微生底和海草，另一个主要基于海草。该模型再次表明存在四个营养级，这与基于无脊椎动物主要消费者和最高食肉动物之间的δ〜（15）N差异所计算的值相符。

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