The impacts of invasive rodents on island invertebrates

The widespread invasive rodents Rattus norvegicus, R. rattus, R. exulans and Mus musculus have been implicated in the decline and extinction of hundreds of island endemic vertebrates, but their effects on island invertebrates are less well-known. Here I present the first global review of the subject...

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Bibliographic Details
Published in:Biological Conservation
Main Author: St Clair, James J. H.
Format: Article in Journal/Newspaper
Language:English
Published: 2011
Subjects:
Invertebrate
NORWAY RATS
MUS-MUSCULUS
INTERTIDAL COMMUNITIES
ZEALAND MAMMALOGY 1990-2000
Rattus
Weta
Trophic cascade
PLACOSTYLUS-AMBAGIOSUS
FERAL HOUSE MICE
PRINCE-EDWARD-ISLANDS
INTRODUCED RODENTS
Invasive species
RATS RATTUS-NORVEGICUS
Mus
Rodents
New Zealand
SUB-ANTARCTIC MARION
Antarctic
Norway
Antarc*
Prince Edward Islands
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/the-impacts-of-invasive-rodents-on-island-invertebrates(00eb4774-41d9-4a46-bb8f-a808fe1f1076).html
https://doi.org/10.1016/j.biocon.2010.10.006
Description
Summary:The widespread invasive rodents Rattus norvegicus, R. rattus, R. exulans and Mus musculus have been implicated in the decline and extinction of hundreds of island endemic vertebrates, but their effects on island invertebrates are less well-known. Here I present the first global review of the subject, which confirms that large-bodied invertebrates are most at risk from these rodents, and that although a disproportionate number of studies (69%) are from New Zealand, rodent-invertebrate impacts are geographically widespread. Mechanisms of impact are both direct (mediated by predation) and indirect (involving intermediary species). Some studies also suggest knock-on effects on ecosystem properties, and given the diverse ecological functions of invertebrates (as detritivores, primary consumers, predators, prey and pollinators). I suggest that an understanding of the interactions between invasive rodents and invertebrates in island ecosystems is essential for effective conservation management. Currently many reported impacts are unquantified, come from uncontrolled and unreplicated designs, or rely on time-series with inadequate baseline data. In addition to basic improvements in study design, this review highlights a need for studies which investigate mechanisms of impact, or impacts across trophic levels. (C) 2010 Elsevier Ltd. All rights reserved.

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