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Effect of exotic cordgrass Spartina alterniflora on the eco-exergy based thermodynamic health of the macrobenthic faunal community in mangrove wetlands

文献类型： 外文期刊

作者： Chen, Quan 1 ; Zhao, Qian 5 ; Chen, Pimao 1 ; Lu, Hongfang 6 ;

作者机构： 1.Chinese Acad Fishery Sci, Key Lab Marine Ranch Technol, Guangzhou 510300, Guangdong, Peoples R China

2.Minist Agr & Rural Affairs, Sci Observing & Expt Stn South China Sea Fishery, Guangzhou 510300, Guangdong, Peoples R China

3.Guangdong Prov Key Lab Fishery Ecol & Environm, Guangzhou 510300, Guangdong, Peoples R China

4.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, 231 West Xingang Rd, Guangzhou 510300, Guangdong, Peoples R China

5.South China Agr Univ, Coll Forestry & Landscape Architecture, Guangzhou 510642, Guangdong, Peoples R China

6.Chinese Acad Sci,

关键词： Ecosystem health; Thermodynamic indicator; Biological invasion; Mollusks

期刊名称：ECOLOGICAL MODELLING （ 影响因子：2.974； 五年影响因子：3.264 ）

ISSN： 0304-3800

年卷期： 2018 年 385 卷

页码：

收录情况： SCI

摘要： The health of natural ecosystems, including mangrove wetlands, is being severely challenged by biological invasions worldwide. For a holistic evaluation of ecosystem health, researchers have commonly measured the ecoexergy of the system in question. Mangrove wetlands depend on their macrobenthic fauna and are threatened by the exotic cordgrass Spartina alternifiora, particularly in South China. However, the effect of S. alternifiora on the health status of macrobenthic faunal community in such wetlands is still unclear. In this study in Zhanjiang, China, eco-exergy was measured to compare the health status of macrobenthic faunal communities in (1) an Ayicennia marina monoculture vs. an S. alternifiora-invaded A. marina stand (an A. marina and S. alterniflora mixture) and in (2) an unvegetated shoal vs. an S. akemiliora-invaded shoal that had rapidly become an S. alternifiora monoculture. Macrobenthic faunal community eco-exergy and biomass but not specific eco-exergy were lower in S. alterniflora-invaded mangrove habitats than in non-invaded ones. In terms of eco-exergy, mollusks were the dominant group in all habitats, and were mainly responsible for the decrease in eco-exergy in the invaded habitats. Differences in the eco-exergy of the macrobenthic faunal community in S. alterniflora-invaded habitats were mainly associated with differences in sediment physicochemical properties and vegetation characteristics in general and with the greater plant density in invaded habitats in particular. The results indicate that the health of the macrobenthic faunal community in mangrove wetlands has been reduced by S. alterniflora invasion and the conservation of ecosystem health in mangrove wetlands will require eradication of S. alterniflora.

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