Compound-specific isotope analysis of amino acids reveals dependency on grazing rather than detritivory in mangrove food webs
Compound-specific isotope analysis of amino acids reveals dependency on grazing rather than detritivory in mangrove food webs
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氨基酸的化合物特异性同位素分析揭示了红树林食物网对放牧的依赖而不是对腐食性的依赖
DOI：
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发表时间：
2021
影响因子：
2.5
通讯作者：
Brian Fry
中科院分区：
文献类型：
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作者：
Y. Harada;Shing Yip Lee;R. M. Connolly;Brian Fry
细菌和真菌从红树林上掉落的腐叶被认为在大多数热带河口食物网的基础上起着重要作用。氨基酸化合物特异性同位素分析（CSIA-AA）使测量植物、细菌和真菌能量流向食物网的方法任务变得困难。在这里，我们使用CSIA-AA方法评估了红树林食物网底部氨基酸的生物合成起源。根据苯丙氨酸和谷氨酸的氮同位素估计，两种最常见的红树林动物——招潮蟹和芝麻蟹的营养位置接近2，这表明这些物种是食草动物，而不是微生物动物。与这一发现相一致的是，原子吸收剂中的碳同位素指纹图谱并不支持来自真菌和细菌的必需原子吸收剂的重要性，而是表明那些来自植物，特别是微藻的原子吸收剂的重要性。这些结果表明：(1)腐烂叶片的微生物矿化支持更容易被同化的微藻的产生；(2)细菌和真菌作为中间产物，也经常将植物来源的原子吸收到它们的生物量中。
Colonisation of decaying leaves fallen from mangrove trees by bacteria and fungi is thought to play an important role at the base of food webs in most tropical estuaries. Compoundspecific isotope analysis of amino acids (CSIA-AA) has enabled the previously difficult methodological task of measuring plant, bacterial and fungal energy flows to food webs. Here, we assessed the biosynthetic origins of amino acids at the base of a mangrove food web using the CSIA-AA approach. Trophic positions of the 2 most common mangrove fauna — fiddler crabs and sesarmid crabs — estimated from nitrogen isotopes in phenylalanine and glutamic acid ap proached 2, suggesting that these species are herbivores rather than microbivores. Consistent with this finding, carbon isotope fingerprints in AAs did not support the importance of essential AAs derived from fungi and bacteria but rather suggested the importance of those originating from plants, especially microalgae. These results suggest that (1) microbial mineralization of decaying leaves supports the production of more easily assimilated microalgae and (2) bacteria and fungi, as intermediates, also routinely incorporate plant-derived AAs into their biomass.
影响因子：
3.7
作者：
Geraldi, Nathan R.;Ortega, Alejandra;Duarte, Carlos M.
通讯作者：
Duarte, Carlos M.