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Distribution of an alien aquatic snail in relation to flow variability, human activities and water quality

journal contribution
posted on 2003-06-01, 00:00 authored by E Schreiber, Gerry QuinnGerry Quinn, P Lake
1. Disturbance and anthropogenic land use changes are usually considered to be key factors facilitating biological invasions. However, specific comparisons of invasion success between sites affected to different degrees by these factors are rare.

2. In this study we related the large-scale distribution of the invading New Zealand mud snail (Potamopyrgus antipodarum) in southern Victorian streams, Australia, to anthropogenic land use, flow variability, water quality and distance from the site to the sea along the stream channel.

3. The presence of P. antipodarum was positively related to an index of flow-driven disturbance, the coefficient of variability of mean daily flows for the year prior to the study.

4. Furthermore, we found that the invader was more likely to occur at sites with multiple land uses in the catchment, in the forms of grazing, forestry and anthropogenic developments (e.g. towns and dams), compared with sites with low-impact activities in the catchment. However, this relationship was confounded by a higher likelihood of finding this snail in lowland sites close to the sea.

5. We conclude that P. antipodarum could potentially be found worldwide at sites with similar ecological characteristics. We hypothesise that its success as an invader may be related to an ability to quickly re-colonise denuded areas and that population abundances may respond to increased food resources. Disturbances could facilitate this invader by creating spaces for colonisation (e.g. a possible consequence of floods) or changing resource levels (e.g. increased nutrient levels in streams with intense human land use in their catchments).

History

Journal

Freshwater biology

Volume

48

Issue

6

Pagination

951 - 961

Publisher

Blackwell Scientific Publications

Location

Oxford, England

ISSN

0046-5070

eISSN

1365-2427

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2003, Blackwell Publishing Ltd.