The impact of invasion of <i>Spartina alterniflora</i> on the food webs of estuarine salt marshes

SHANG Xu; GUAN Wei-bing; ZHANG Guo-sen; ZHANG Jing

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SHANG Xu, GUAN Wei-bing, ZHANG Guo-sen, ZHANG Jing. The impact of invasion of Spartina alterniflora on the food webs of estuarine salt marshes[J]. Haiyang Xuebao, 2009, 31(1): 132-142.

Citation:

SHANG Xu, GUAN Wei-bing, ZHANG Guo-sen, ZHANG Jing. The impact of invasion of Spartina alterniflora on the food webs of estuarine salt marshes[J]. Haiyang Xuebao, 2009, 31(1): 132-142.

SHANG Xu, GUAN Wei-bing, ZHANG Guo-sen, ZHANG Jing. The impact of invasion of Spartina alterniflora on the food webs of estuarine salt marshes[J]. Haiyang Xuebao, 2009, 31(1): 132-142.

Citation:

SHANG Xu, GUAN Wei-bing, ZHANG Guo-sen, ZHANG Jing. The impact of invasion of Spartina alterniflora on the food webs of estuarine salt marshes[J]. Haiyang Xuebao, 2009, 31(1): 132-142.

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The impact of invasion of Spartina alterniflora on the food webs of estuarine salt marshes

1.
School of Environmental Science and Public Health, Wenzhou Medical College, Zhejiang 325035, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
College of Marine Science, Shanghai Ocean University, Shanghai 200090, China
3.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2008-08-18
Rev Recd Date: 2009-01-12

Abstract

Abstract

Salt marsh has now been extensively concerned for its important role in estuarine and coastal eco-systems,and the rapid expanding of invaded Spartina alterniflora is also regarded as a serious problem in the Changjiang Estuary and even all the coast al region of southeast China. However,it is still difficult to evaluate the impact of the invasion of S. alterniflora on the native ecosystem for lacking of know ledge about the food web structures of salt marshes here. The relative trophic contributions of primary producers in the salt marshes of the Changjiang Estuary have been estimated by IsoSource and clustering analysis based on measurement of carbon and nitrogen stable isotopes of the dominate producers and consumers. The results indicate that the food web here is mostly supported by microphytobenthos(MPB)and native terrestrial C3 vascular plants,while the contribution of invaded C4 plants S. alterniflora is minor and its δ¹³C enriched production can only be utilized specifically by one gastropod in summer. The proportion of S. alterniflora in the total production of salt marshes in the Changjiang Estuary will increase during its rapid expanding,so that influence the structure and function of food web here "bottom-up" from the trophic base.
- Changjiang Estuary,
- salt marsh,
- foodweb,
- Spartina alterniflora,
- stable isotope,
- IsoSource

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