| Abstract: | Positive interactions among non-native species could greatly exacerbate the problem of
invasions, but are poorly studied and our knowledge of their occurrence is mostly limited
to plant-pollinator and dispersal interactions. We found that invasion of bullfrogs is
facilitated by the presence of co-evolved non-native fish, which increase tadpole survival
by reducing predatory macroinvertebrate densities. Native dragonfly nymphs in Oregon,
USA caused zero survival of bullfrog tadpoles in a replicated field experiment unless a
non-native sunfish was present to reduce dragonfly density. This pattern was also evident
in pond surveys where the best predictors of bullfrog abundance were the presence of
non-native fish and bathymetry. This is the first experimental evidence of facilitation
between two non-native vertebrates and supports the invasional meltdown hypothesis.
Such positive interactions among non-native species have the potential to disrupt
ecosystems by amplifying invasions, and our study shows they can occur via indirect
mechanisms. |
| Genre: | Article |
| ProdID: | 1016322 |
| Citation Author: | Adams, Michael J.; Pearl, Christopher A.; Bury, R. Bruce |
| Citation Contributing Office: | Forest and Rangeland Ecosystem Science Center |
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| Citation End Page: | 351 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Ecology Letters |
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| Citation Number Of Pages: | 9 |
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| Citation Phsyical Description: | p. 343-351 |
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| Citation Search Results Text: | Indirect facilitation of an anuran invasion by non-native fishes; 2003; Article; Journal; Ecology Letters; Adams, Michael J.; Pearl, Christopher A.; Bury, R. Bruce |
| Citation Start Page: | 343 |
| Citation Volume: | 6 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Indirect facilitation of an anuran invasion by non-native fishes; 2003; Article; Journal; Ecology Letters; Adams, Michael J.; Pearl, Christopher A.; Bury, R. Bruce |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://fresc.usgs.gov/products/papers/1187_Adams.pdf |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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