Copp, G.H., Templeton, M. and Gozlan, R. E., 2007. Propagule Pressure and the Invasion Risks of Non-Native Freshwater Fishes: A Case Study in England. Journal of Fish Biology, 71 (4), pp. 148-159.
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European countries in general, and England in particular, have a long history of introducing non-native fish species, but there exist no detailed studies of the introduction pathways and propagules pressure for any European country. Using the nine regions of England as a preliminary case study, the potential relationship between the occurrence in the wild of non-native freshwater fishes (from a recent audit of non-native species) and the intensity ( i.e. propagule pressure) and diversity of fish imports was investigated. The main pathways of introduction were via imports of fishes for ornamental use ( e.g. aquaria and garden ponds) and sport fishing, with no reported or suspected cases of ballast water or hull fouling introductions. The recorded occurrence of non-native fishes in the wild was found to be related to the time (number of years) since the decade of introduction. A shift in the establishment rate, however, was observed in the 1970s after which the ratio of established-to-introduced species declined. The number of established non-native fish species observed in the wild was found to increase significantly ( P < 0·05) with increasing import intensity (log<sub>10</sub> x + 1 of the numbers of fish imported for the years 2000–2004) and with increasing consignment diversity (log<sub>10</sub> x + 1 of the numbers of consignment types imported for the years 2000–2004). The implications for policy and management are discussed.
|Subjects:||Geography and Environmental Studies|
Science > Biology and Botany
|Group:||School of Applied Sciences > Centre for Conservation, Ecology and Environmental Change|
|Deposited By:||INVALID USER|
|Deposited On:||28 Nov 2008 20:59|
|Last Modified:||07 Mar 2013 14:59|
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