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首页> 外文期刊>Estuarine Coastal and Shelf Science >Food partitioning of leaf-eating mangrove crabs (Sesarminae): Experimental and stable isotope (~(13)C and ~(15)N) evidence
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Food partitioning of leaf-eating mangrove crabs (Sesarminae): Experimental and stable isotope (~(13)C and ~(15)N) evidence

机译：以食叶的红树林蟹（Sesarminae）的食物分配：实验性同位素和稳定同位素（〜（13）C和〜（15）N）证据

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The feasibility of mangrove leaves as a full diet for sesarmid crabs has been questioned for decades. Since these leaves are nitrogen-poor, sesarmids probably obtain nitrogen from other sources to sustain growth. The aim of this study was to assess the food partitioning of the sesarmid species Neoepisesarma versicolor with emphasis on nitrogen allocation. The preference for animal tissue when crabs were pre-fed diets of different nitrogen content was determined in the laboratory. Furthermore, the possible in situ diet composition of N. versicolor was established from carbon and nitrogen stable isotope signature (δ~(13)C and δ~(15)N) of freshly caught individuals and their potential food sources, using a concentration-dependent mixing model. N. versicolor showed significantly higher feeding preferences for fish meat when pre-fed leaf material without than with access to meat, indicating that this crab species can meet its nitrogen demand by ingesting animal tissue. The stable isotope mixing model based on in situ materials suggests that the diet of N. versicolor consists of ～60% leaves in terms of biomass, leaving ～40% for other sources such as animal tissue and benthic microorganisms. The biomass contribution from animal tissues, in form of e.g. other crustaceans and fish carcasses, was found to account for ～15%. Despite the relative low biomass fraction, animal food sources may contribute with up to half of the nitrogen in the diet of N. versicolor. The quantity of ingested sediment most likely exceeds that of animal tissues. However, due to the low concentration of assimilable microalgae and other microorganism, we propose that sediment associated sources are less important as a nitrogen source for N. versicolor than hitherto presumed.
机译：几十年来，人们一直质疑将红树林叶作为芝麻肉蟹全食的可行性。由于这些叶子的氮含量很低，因此，sesarmids可能会从其他来源获取氮来维持生长。这项研究的目的是评估斑节菜种新皮虾的杂种的食物分配，重点是氮的分配。在实验室中确定了当螃蟹预饲不同氮含量的饲料时对动物组织的偏好。此外，根据新鲜捕捞者的碳和氮稳定同位素特征（δ〜（13）C和δ〜（15）N）及其潜在的食物来源，可以通过以下方法建立杂色猪的原位饮食组成：依赖混合模型。当未喂食叶片材料时，杂色猪笼草对鱼肉的摄食偏好明显高于不接触肉类，这表明该蟹种可以通过摄取动物组织来满足其对氮的需求。基于原位物质的稳定同位素混合模型表明，杂色猪笼草的饮食中生物量占叶的约60％，动物组织和底栖微生物等其他来源的叶约占40％。动物组织对生物质的贡献，例如发现其他甲壳类和鱼尸体约占15％。尽管生物质含量相对较低，但动物食品来源可能会贡献多色猪笼草的氮含量的一半。摄入的沉积物数量很可能超过动物组织的数量。但是，由于同化微藻类和其他微生物的浓度低，我们认为与泥沙相关的来源作为杂色猪笼草的氮源比迄今推测的重要。

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