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首页> 外文期刊>Marine ecology >Tracing carbon transfer and assimilation by invertebrates and fish across a tropical mangrove ecosystem using stable isotopes
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Tracing carbon transfer and assimilation by invertebrates and fish across a tropical mangrove ecosystem using stable isotopes

机译：利用稳定同位素追踪无脊椎动物和鱼类在热带红树林生态系统中的碳转移和同化

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Mangroves are highly productive ecosystems that exhibit a diverse range of habitats, including tidal creeks and flats, forest gaps and interior forest with varying understory light intensity, tidal dynamics, geomorphological settings, and overall biological production. Within mangrove ecosystems, invertebrates and fish feed on heterogeneous food sources, the occurrence of which is unevenly distributed across the system. This provides a basis for testing models of carbon transfer across mangrove ecosystems. We hypothesized that the carbon transfer and assimilation by fish and invertebrates will vary across the different mangrove habitats and that such variations can be predicted by their stable isotope compositions. We analysed delta C-13 and delta N-15 signatures of consumers and their potential organic carbon sources across a tropical mangrove ecosystem in Vietnam. The delta C-13 values of crabs and snails significantly decreased from the tidal flat to interior forest, indicating that variations in carbon transfer and assimilation occurred at small scales <30 m. Reduced variation in delta C-13 of suspension-feeding bivalves suggested that tidal water was a vector for large-scale transport of carbon across the mangrove ecosystem. An analysis of co-variance using habitat as a fixed factor and feeding habit and movement capacity of consumers as co-variates indicated that habitat and feeding types were major features that affected the delta C-13 values of invertebrates and fish. The findings demonstrate that carbon transfer and assimilation across mangrove ecosystems occur as a diverse combination of small (<30 m) and large (>30 m) scale processes.
机译：红树林是高生产力的生态系统，表现出多种多样的栖息地，包括潮汐小溪和滩涂，林间空地和室内林，林下光照强度，潮汐动力学，地貌环境和整体生物产量都不同。在红树林生态系统中，无脊椎动物和鱼类以异质食物为食，其发生在整个系统中分布不均。这为测试跨红树林生态系统的碳转移模型提供了基础。我们假设鱼和无脊椎动物的碳转移和同化将在不同的红树林生境中发生变化，并且这种变化可以通过其稳定的同位素组成来预测。我们分析了越南热带红树林生态系统中消费者的三角洲C-13和三角洲N-15签名及其潜在的有机碳源。从潮滩到内陆森林，螃蟹和蜗牛的δC-13值显着降低，表明在小于30 m的小尺度上发生了碳转移和同化的变化。悬浮饲料双壳类动物的δC-13差异减小表明潮汐水是跨红树林生态系统大规模运输碳的媒介。使用栖息地作为固定因素并以消费者的摄食习性和移动能力作为协变量的协方差分析表明，栖息地和摄食类型是影响无脊椎动物和鱼类三角洲C-13值的主要特征。研究结果表明，跨红树林生态系统的碳转移和吸收是小规模（<30 m）和大型（> 30 m）过程的多样化组合。

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