Invasion biology and ecological impacts of brown trout Salmo trutta in New Zealand

Invasion biology and ecological impacts of brown trout Salmo trutta in New Zealand Brown trout Salmo trutta were introduced to New Zealand in 1867. Successful establishment was broadly predictable in terms both of the characteristics of brown trout and of the receiving community. There is evidence of impacts of brown trout on the abundance of some native fish and invertebrates, and brown trout have been responsible for the local extinction and fragmentation of certain species. An intensive study of the Taieri River has revealed that several native galaxiid fishes are now restricted to headwaters above large waterfalls that prevent the upstream migration of brown trout. Brown trout may profoundly affect the functioning of stream communities, reducing the abundance of grazing invertebrates and altering their grazing behaviour so that algal biomass increases. A trophic cascade was predictable on the basis of the attributes of the invader and of the stream community. Brown trout seem to have been responsible for the evolution among invertebrates of novel anti-predator behaviours with far-reaching community consequences. The ecological and evolutionary consequences of the introduction of brown trout to New Zealand are probably reversible. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biological Conservation Elsevier

Invasion biology and ecological impacts of brown trout Salmo trutta in New Zealand

Biological Conservation, Volume 78 (1) – Oct 1, 1996

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Publisher
Elsevier
Copyright
Copyright © 1996 Elsevier Ltd
ISSN
0006-3207
D.O.I.
10.1016/0006-3207(96)00014-6
Publisher site
See Article on Publisher Site

Abstract

Brown trout Salmo trutta were introduced to New Zealand in 1867. Successful establishment was broadly predictable in terms both of the characteristics of brown trout and of the receiving community. There is evidence of impacts of brown trout on the abundance of some native fish and invertebrates, and brown trout have been responsible for the local extinction and fragmentation of certain species. An intensive study of the Taieri River has revealed that several native galaxiid fishes are now restricted to headwaters above large waterfalls that prevent the upstream migration of brown trout. Brown trout may profoundly affect the functioning of stream communities, reducing the abundance of grazing invertebrates and altering their grazing behaviour so that algal biomass increases. A trophic cascade was predictable on the basis of the attributes of the invader and of the stream community. Brown trout seem to have been responsible for the evolution among invertebrates of novel anti-predator behaviours with far-reaching community consequences. The ecological and evolutionary consequences of the introduction of brown trout to New Zealand are probably reversible.

Journal

Biological ConservationElsevier

Published: Oct 1, 1996

References

  • Exotic organisms: a dilemma for conservation biology
    Coblentz, B.E.
  • Restoring island ecosystems: the potential of parasites to control introduced mammals
    Dobson, A.P.
  • New Zealand freshwater fishes
    McDowall, R.M.
  • Competition for space between introduced brown trout Salmo trutta L., and a native galaxiid Galaxias vulgaris Stokell. in a New Zealand stream
    McIntosh, A.R.; Townsend, C.R.; Crowl, T.A.
  • Predation and the prey community of a headwater stream
    Schofield, K.; Townsend, C.R.; Hildrew, A.G.
  • Predation, competition and prey communities: a review of field experiments
    Sih, A.; Crowley, P.; McPeek, M.; Petranka, J.; Strohmeier, K.
  • The characters of successful invaders
    Williamson, M.; Fitter, A.

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