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Influence of climate-induced biogeographic range shifts on mudflat ecological functioning in the subtropics

Caswell, Bryony A.; Dissanayake, Navodha G.; Frid, Christopher L.J.

Authors

Navodha G. Dissanayake

Christopher L.J. Frid



Abstract

A growing volume of evidence shows that the broad-scale biogeographic redistribution of species is occurring in response to increasing global temperatures. The present study documents poleward movements of up to eight species of nominally ‘tropical’ macroinvertebrates (molluscs, polychaetes, crustaceans and foraminifera) from intertidal mudflats on the south east coast of Australia. The speed of movement was comparable with that for Australian marine fauna generally, but was particularly fast for worms and molluscs (~70–300 km decade−1) and may be facilitated by the southward flowing East Australia Current. Further, two temperate taxa appear to have extended their ranges northwards. Changes in species biogeographic ranges raises questions surrounding the response of ecological processes within the altered and novel species combinations, including processes that underpin valuable ecosystem services. Using biological traits analysis to investigate how the observed species range changes might have impacted mudflat ecosystem functioning, and to predict the possible impacts of further poleward movements of tropical taxa. Our models suggest the changes to date, and those likely to occur in the near future, are within the envelope whereby ecological functioning is maintained by functional compensation and redundancy within the mudflat assemblage. However, in the most extreme scenario the replacement of temperate by tropical taxa resulted in major changes in ecological functioning with potential impacts on nutrient cycling and C-cycling, undermining the potential of these mudflats to continue to deliver critical ecosystem services. The widespread nature of biogeographic range shifts and the value of coastal systems should add further weight to calls for global action to mitigate global temperature change.

Journal Article Type Article
Publication Date May 31, 2020
Journal Estuarine, Coastal and Shelf Science
Print ISSN 0272-7714
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 237
Pages 106692
APA6 Citation Caswell, B. A., Dissanayake, N. G., & Frid, C. L. (2020). Influence of climate-induced biogeographic range shifts on mudflat ecological functioning in the subtropics. Estuarine, coastal and shelf science, 237, 106692. https://doi.org/10.1016/j.ecss.2020.106692
DOI https://doi.org/10.1016/j.ecss.2020.106692
Keywords Climate change; Ecosystem services; Infauna; Functional compensation; Biological traits; Novel assemblages
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S0272771419304871?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: Influence of climate-induced biogeographic range shifts on mudflat ecological functioning in the subtropics; Journal Title: Estuarine, Coastal and Shelf Science; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ecss.2020.106692; Content Type: article; Copyright: © 2020 Elsevier Ltd. All rights reserved.
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