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Utilization of carbon sources in a northern Brazilian mangrove ecosystem

机译：巴西北部红树林生态系统中碳源的利用

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Carbon and nitrogen stable isotope ratios (~13C and ~15N) and trophic level (TL) estimates based on stomach content analysis and published data were used to assess the contribution of autotrophic sources to 55 consumers in an intertidal mangrove creek of the Curuc,a estuary, northern Brazil. Primary producers showed δ~13C signatures ranging between -29.2 and -19.5‰, and δ~15N from 3.0 to 63‰. The wide range of the isotopic composition of carbon of consumers (-28.6 to -17.1‰) indicated that different autotrophic sources are important in the intertidal mangrove food webs. Food web segregation structures the ecosystem into three relatively distinct food webs: (i) mangrove food web, where vascular plants contribute directly or indirectly via POM to the most ~13C-depleted consumers (e.g. Ucides cordatus and zooplanktivorous food chains); (ii) algal food web, where benthic algae are eaten directly by consumers (e.g. Uca maracoani, mullets, polychaetes, several fishes); (iii) mixed food web where the consumers use the carbon from different primary sources (mainly benthivorous fishes). An IsoError mixing model was used to determine the contributions of primary sources to consumers, based on δ~13C values. Model outputs were very sensitive to the magnitude of trophic isotope fractionation and to the variability in ~13C data. Nevertheless, the simplification of the system by a priori aggregation of primary producers allowed interpretable results for several taxa, revealing the segregation into different food webs.
机译：碳含量和氮稳定同位素比（〜13C和〜15N）和基于胃含量分析和营养水平（TL）的估计值被用于评估Curuc潮间带红树林中自养来源对55个消费者的贡献。巴西北部河口。初级生产者的δ〜13C签名范围为-29.2至-19.5‰，δ〜15N的范围为3.0至63‰。消费者的碳同位素组成范围很广（-28.6至-17.1‰）表明，不同的自养来源在潮间带红树林食物网中很重要。食物网的隔离将生态系统分为三个相对不同的食物网：（i）红树林食物网，其中维管植物通过POM直接或间接地为13 C消耗最严重的消费者（例如，脐带虫和食动动物的食物链）做出贡献； （ii）藻类食物网，消费者直接食用底栖藻类（例如，Uca maracoani，鱼，多毛cha，几种鱼）； （iii）混合食品网，其中消费者使用来自不同主要来源（主要是杂食鱼类）的碳。 IsoError混合模型用于基于δ〜13C值确定主要来源对消费者的贡献。模型输出对营养同位素分级的大小和〜13C数据的变化非常敏感。然而，通过优先生产者的先验聚集简化了系统，使得若干分类单元的结果可解释，揭示了分离成不同食物网的情况。

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