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1 January 2018 Effects of Spartina alterniflora Invasion on the Diet of Mangrove Crabs (Parasesarma plicata) in the Zhangjiang Estuary, China
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Abstract

Gao, X.; Wang, M.; Wu, H.; Wang, W., and Tu, Z., 2018. Effects of Spartina alterniflora invasion on the diet of mangrove crabs (Parasesarma plicata) in the Zhangjiang Estuary, China.

Spartina alterniflora , an exotic invasive plant, has become the most serious threat colonizing mangrove areas in China in the past two decades. The diets of a dominant mangrove crab, Parasesarma plicata, in two mangrove habitats (Kandelia obovata forest and Avicennia marina forest) and adjacent S. alterniflora marsh in a subtropical mangrove estuary in Fujian, China, were investigated using stable isotopes, while a feeding experiment was carried out. The results showed that in the Avicennia forest, Parasesarma was herbivorous, feeding mainly on macroalgae. In the Kandelia forest, the contribution of mangrove leaves, macroalgae, and sediment to the diet of Parasesarma were about 75.5%, 24.2%, and 0.2%, respectively. While Parasesarma had a higher δ13C value and also a higher δ15N value in the Spartina marshes relative to the two mangrove habitats, suggesting that they were feeding on Spartina detritus as well as some small invertebrates. The feeding experiment showed that the δ13C value of Parasesarma after 90-day feeding only on Spartina leaves was very close to the δ13C value of the crab caught from the Spartina marshes, indicating that Spartina was the main carbon source. These results demonstrated that the invasion of Spartina has changed the main food resources of native crabs by providing food resources, which could affect the impact of crabs as ecological engineers and eventually affect the integrity and function of native ecosystems.

©Coastal Education and Research Foundation, Inc. 2018
Xueqin Gao, Mao Wang, Hao Wu, Wenqing Wang, and Zhigang Tu "Effects of Spartina alterniflora Invasion on the Diet of Mangrove Crabs (Parasesarma plicata) in the Zhangjiang Estuary, China," Journal of Coastal Research 34(1), (1 January 2018). https://doi.org/10.2112/JCOASTRES-D-17-00002.1
Received: 3 January 2017; Accepted: 7 March 2017; Published: 1 January 2018
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