期刊
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
卷 21, 期 4, 页码 317-323出版社
WILEY-BLACKWELL
DOI: 10.1002/aqc.1199
关键词
exotic species; stable isotopes; food webs; competition; management
资金
- The Nature Conservancy
- The National Science Foundation [DEB-0074876]
1. Exotic species threaten native species worldwide, but their impacts are difficult to predict. 2. Stable isotope analysis was combined with field competition experiments to predict how an invasive African cichlid fish, Hemichromis guttatus, might affect native fish in the desert springs of Cuatro Cienegas, Mexico. 3. Stable isotope analysis suggested diet overlap between the invader and juvenile endemic cichlids, and field experiments verified that the invader reduces growth rates of the juvenile endemics through competition, but has smaller effects on adults. 4. Competition between juvenile endemic cichlids and the invader was asymmetric, with the exotic out-competing the native, suggesting the potential for competitive exclusion if the invasion is not stopped. 5. These results suggest that exotic removal programmes in Cuatro Cienegas should focus on removing/reducing populations of the exotic cichlid in habitats where juvenile native cichlids are concentrated. 6. This approach could help focus efforts to manage exotic species before populations of native species have crashed, when it is too late to intervene. Copyright (C) 2011 John Wiley & Sons, Ltd.
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