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A long-term study (1949–2015) of the aftermaths of the deliberate experimental introduction of an invasive freshwater amphipod (crustacea) to a small Island

MacNeil, Calum and Campbell, Marnie 2018, A long-term study (1949–2015) of the aftermaths of the deliberate experimental introduction of an invasive freshwater amphipod (crustacea) to a small Island, Aquatic Invasions, vol. 13, no. 4, pp. 491-500, doi: 10.3391/ai.2018.13.4.07.

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Title A long-term study (1949–2015) of the aftermaths of the deliberate experimental introduction of an invasive freshwater amphipod (crustacea) to a small Island
Author(s) MacNeil, Calum
Campbell, Marnie
Journal name Aquatic Invasions
Volume number 13
Issue number 4
Start page 491
End page 500
Total pages 10
Publisher Regional Euro-Asian Biological Invasions Centre (REABIC)
Place of publication Helsinki, Finland
Publication date 2018-11
ISSN 1798-6540
1818-5487
Keyword(s) Amphipods
Crangonyx
deliberate introductions
Gammarus
propagule pressure
Summary The ability to track changing distributions and long-term interactions between native and introduced species provides insights into forecasting impacts of invaders. We used data from deliberate field introduction experiments of a freshwater Gammarus amphipod (Crustacea) to the rivers of a small British island, The Isle of Man. The deliberate introductions commenced in 1949 and re-sampling occurred in the ‘60s, ‘70s ‘80s, ‘90s, 2005 and finally in 2015. The findings generally confirmed the failure of introductions of Gammarus pulex into sites previously dominated by the native Gammarus duebeni celticus even with high propagule pressure in terms of numbers of individual invaders released and repeated introductions. Despite this, the island-wide 2015 survey revealed that G. d. celticus occurred in fewer sites and G. pulex in more sites than a decade earlier, indicating at this island-wide scale, the displacement of G. pulex by G. d. celticus seems to be continuing. In addition, one of the introduction sites, Arbory Stream which contained G. d. celticus from 1951–2005 contained only G. pulex in 2015, showing that even after six decades, assumptions cannot be made as to the limits of invader range expansion. Multivariate analysis of physico-chemical data from the 2015 island-wide survey revealed water quality as a crucial environmental gradient that influences the distributions of the native and invader species, with the former in higher organic water quality sites than sites with the invader or where invader and native co-occurred. The North American amphipod Crangonyx pseudogracilis had expanded its range since 2005, including invading low biological water quality sites previously devoid of both Gammarus spp.. Pollution from historic metal mining is implicated as a potential major factor excluding amphipods. This deliberate ecological experiment, through long-term monitoring, continues to provide insights into the factors determining the distributions of natives and invaders.
Language eng
DOI 10.3391/ai.2018.13.4.07
Indigenous content off
Field of Research 0501 Ecological Applications
0502 Environmental Science and Management
0602 Ecology
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2018, The Author(s)
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30140589

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.