期刊
MARINE ENVIRONMENTAL RESEARCH
卷 131, 期 -, 页码 134-145出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2017.09.018
关键词
Phragmites australis beds; Trophic structure; Macrobenthos; Stable isotopes; Intertidal wetland; Dike
资金
- Long-term change of structure and function in marine ecosystems of Korea - Ministry of Oceans and Fisheries, Korea
This study characterized trophic structures of the macrobenthic food webs in two contrasting estuarine wetlands, with and without a dike, on the southern coast of Korea, based on the delta C-13 and delta N-15 values of dominant macrobenthic consumers. The pelagic algal biomasses were similar in the upper Phragmites australis-covered and lower bare intertidal habitats partitioned by the dike, but the microphytobenthos (MPB) biomasses were extremely low in the Phragmites bed. The consumer delta C-13 values were more negative and their isotopic niche width was much narrower in the upper than in the lower habitat at the diked site. These dissimilar spatial patterns between sites suggest a simplified food-web structure, which reflects the reduced availability of MPB in the upper habitat in the dike-impacted site. Overall, our findings suggest that restriction of the tides by dike construction induces local changes in basal resource availability and faunal composition, leading to macrobenthic community trophic reorganization. (C) 2017 Elsevier Ltd. All rights reserved.
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