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Presence of invasive Gambusia alters ecological communities and the functions they perform in lentic ecosystems

journal contribution
posted on 2017-03-10, 00:00 authored by C Hinchliffe, T Atwood, Quinn Ollivier, E Hammill
By acting as novel competitors and predators, a single invasive species can detrimentally affect multiple native species in different trophic levels. Although quantifying invasive effects through single-species interactions is important, understanding their effect on ecosystems as a whole is vital to enable effective protection and management. This is particularly true in fr eshwater ecosystems, where invasive species constitute the single greatest threat to biodiversity. Poeciliid fishes of the genus Gambusia are among the most widespread invasive species on earth. In the present study of lentic ecosystems (i.e. lakes), we first showed that Gambusia alter zooplankton community composition and size distribution, likely through size-selective predation. Second, we demonstrate that benthic macroinvertebrate communities significantly differ between sites with and without invasive Gambusia. The presence of Gambusia appears to reduce leaf-litter decomposition rates, which is likely an indirect effect of reductions in detritivore abundances. Reductions in decomposition rates found in the present study suggest that through trophic cascades, invasive Gambusia is able to indirectly alter ecosystem functions. The study has highlighted that the widespread effects of invasive aquatic species are able to permeate through entire ecosystems, being more pervasive than previously recognised.

History

Journal

Marine and Freshwater Research

Volume

68

Issue

10

Pagination

1867 - 1876

Publisher

C S I R O Publishing

Location

Clayton, Vic.

ISSN

1323-1650

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2017, CSIRO