Trophic Consistency of Benthic Invertebrates Among Diversified Vegetational Habitats in a Temperate Coastal Wetland of Korea as Determined by Stable Isotopes

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Date: Mar. 2015
From: Estuaries and Coasts(Vol. 38, Issue 2)
Publisher: Springer
Document Type: Report
Length: 265 words

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Byline: Hyun Je Park (1), Jung Hyun Kwak (1), Chang-Keun Kang (1) Keywords: Stable isotopes; Trophic structure; Microphytobenthos; Intertidal flat; Salt marsh Abstract: The relative importance of different organic matter sources to macrobenthic consumers was investigated at two vegetational habitats (Phragmites australis and Suaeda japonica) and at a bare intertidal flat in Suncheon Bay in May and August 2010, using stable carbon and nitrogen isotope tracers. The [delt[a].sup.13]C of consumers was much narrower in range than that of potential food sources (microphytobenthos, marsh plants, and riverine and marine particulate organic matter), and values were similar between sites. However, cluster analysis based on the consumer's isotope values showed that they are divided according to functional groups rather than habitat type and taxonomical group, suggesting that the exploitation of different dietary sources depends on feeding strategy. Except for two suspension feeders and nonselective deposit feeders at the Phragmites bed, most consumers had similar [delt[a].sup.13]C to those of microphytobenthos. An isotopic mixing model calculation revealed the consistent importance of microphytobenthos to the nutrition of benthic invertebrates among wetland habitats in different seasons. In contrast, very little contribution of marsh plant-derived organic matter to consumer nutrition was detected at all sites. Furthermore, our results suggest that the summer monsoon event does not lead to a seasonal shift in dietary sources of consumers in this coastal wetland system. Author Affiliation: (1) School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, Republic of Korea Article History: Registration Date: 15/05/2014 Received Date: 01/08/2013 Accepted Date: 13/05/2014 Online Date: 06/06/2014 Article note: Communicated by Carolyn A. Currin

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Gale Document Number: GALE|A398972344