| Publication Type: | Journal Article |
| Year of Publication: | 2009 |
| Authors: | K. A. Young, Stephenson, J., Terreau, A., Thailly, A. F., Gajardo, G., C. de Leaniz, G. |
| Journal: | Biological InvasionsBiological Invasions |
| Volume: | 11 |
| Pagination: | 1955-1961 |
| Keywords: | AQUACULTURE, ATLANTIC SALMON, CHILE, COMPETITION, DIVERSITY, EXOTIC, EXOTIC SPECIES, EXOTICS, FISH, FISH COMMUNITY, GALAXIIDS, GROWTH, GROWTH RATE, INTERSPECIFIC COMPETITION, INVASION, INVASIONAL MELTDOWN, INVASIVE, JUVENILE, NATIVE, NATIVE SPECIES, ONCORHYNCHUS, ONCORHYNCHUS MYKISS, RAINBOW TROUT, RESISTANCE, SALMO, SALMO SALAR, SALMON, SALMONID, SALMONIDS, SPECIES DIVERSITY, SPECIES-DIVERSITY, STREAM, STREAM FISH, TREATMENT, TROUT |
| Abstract: | We used an invaded stream fish community in southern Chile to experimentally test whether the diversity of exotic species affects their competitive impact on a native species. In artificial enclosures an established invasive, rainbow trout, Oncorhynchus mykiss, and a potential invader, Atlantic salmon, Salmo salar, reduced the growth rate of native peladilla, Aplochiton zebra, by the same amount. In enclosures with both exotic salmonids, the growth rates of all three species were the same as in single exotic treatments. While neither species identity nor diversity appeared to affect competitive interactions in this experiment, the impact of salmonid diversity may vary with the type of interspecific interaction and/or the species identity of the exotics. Our experiment links two prominent concepts in invasion biology by testing whether the result of invasional meltdown, an increase in the diversity of exotic species, affects their impact through interspecific competition, the mechanism invoked by the biotic resistance hypothesis. Keywords Exotic species diversity - Interspecific competition - Salmonids - Galaxiids - Stream enclosure experiment - Aquaculture |
| Reprint Edition: | IN FILE |