Macroinvertebrate diet in intertidal seagrass and sandflat communities: A study using C, N, and S stable isotopes
Macroinvertebrate diet in intertidal seagrass and sandflat communities: A study using C, N, and S stable isotopes
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潮间带海草和沙坪群落中大型无脊椎动物的饮食：使用 C、N 和 S 稳定同位素的研究
DOI：
10.1080/00288330.2006.9517450
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发表时间：
2006
影响因子：
1.6
通讯作者：
C. Hurd
中科院分区：
文献类型：
--
作者：
D. Leduc;P. Probert;Russell Frew;C. Hurd
摘要利用稳定同位素对海草群落食物网的研究大多是在潮下生境中进行的。我们使用碳、氮和S稳定同位素来描述夏季末和冬季在新西兰南部潮间带和滩涂群落中发现的优势大型无脊椎动物的食性。摩羯座的ä13C和ä34S值的范围很宽(>；5‰)，这突出了考虑初级生产者同位素特征的空间和时间变异性的重要性。摩羯座Z的ä15N值范围相对较小(<；L‰)。基于ä13C和ä15N特征的混合模型表明，在海草场地抽样的大多数消费者的饮食中，摩羯座Z是潜在的重要贡献者(24%-99%)，而在沙坪场地，微型底栖动物主导了相同消费者的饮食。主要的例外是双壳类，它的食物主要(高达85%)含有石榴石和多管藻。在两个地点都有。S同位素的使用被证明是有限的，因为很难对微型底栖动物进行采样，而且消费者可能会从非饮食来源获得34S枯竭的硫。混合模型还表明，在8月份(冬末)比3月份(夏末)，摩羯座Z.Capricorni对捕食者食物的贡献更大。
Abstract Most seagrass community food‐web studies using stable isotopes have been carried out in subtidal habitats during one sampling event. We used C, N, and S stable isotopes to characterise the diet of the dominant macroinvertebrates found in intertidal Zostera capricorni and sandflat communities of southern New Zealand in late summer and winter. The range of ä13C and ä34S values for Z. capricorni was wide (>5‰), which highlights the importance of accounting for spatial and temporal variability in primary producer isotopic signatures. The range of ä15N values for Z. capricorni was comparatively small (<l‰). Mixing models based on ä13C and ä15N signatures suggested that Z. capricorni was a potentially important contributor (24–99%) to the diet of most consumers sampled at the seagrass site, whereas microphytobenthos dominated the diet of the same consumers at the sandflat site. The main exception was the bivalve Austrovenus stutchburyi, which had a diet consisting mostly (up to 85%) of Ulva and Polysiphonia spp. at both sites. S isotopes proved to be of limited use owing to the difficulty of sampling microphytobenthos and to potential non‐dietary sources of 34S‐depleted sulfur to consumers. Mixing models also suggested that Z. capricorni contributed more to the diet of deposit feeders in August (late winter) than in March (late summer).