Big trouble for little fish: identifying Australian freshwater fishes in imminent risk of extinction

Lintermans, Mark, Geyle, Hayley M., Beatty, Stephen, Brown, Culum, Ebner, Brendan C., Freeman, Rob, Hammer, Michael P., Humphreys, William F., Kennard, Mark J., Kern, Pippa, Martin, Keith, Morgan, David L., Raadik, Tarmo A., Unmack, Peter J., Wager, Rob, Woinarski, John C.Z., and Garnett, Stephen T. (2020) Big trouble for little fish: identifying Australian freshwater fishes in imminent risk of extinction. Pacific Conservation Biology, 26 (4). pp. 365-377.

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Abstract

Globally, freshwater fishes are declining at an alarming rate. Despite much evidence of catastrophic declines, few Australian species are listed as threatened under national legislation. We aim to help redress this by identifying the Australian freshwater fishes that are in the most immediate risk of extinction. For 22 freshwater fishes (identified as highly threatened by experts), we used structured expert elicitation to estimate the probability of extinction in the next ,20 years, and to identify key threats and priority management needs. All but one of the 22 species are small (,150 mm total length), 12 have been formally described only in the last decade, with seven awaiting description. Over 90% of these species were assessed to have a .50% probability of extinction in the next ,20 years. Collectively, the biggest factor contributing to the likelihood of extinction of the freshwater fishes considered is that they occur in small (distributions #44 km2), geographically isolated populations, and are threatened by a mix of processes (particularly alien fishes and climate change). Nineteen of these species are unlisted on national legislation, so legislative drivers for recovery actions are largely absent. Research has provided strong direction on how to manage ,35% of known threats to the species considered, and, of these, ,36% of threats have some management underway (although virtually none are at the stage where intervention is no longer required). Increased resourcing, management intervention and social attitudinal change is urgently needed to avert the impending extinction of Australia’s most imperilled freshwater fishes.

Item ID: 65157
Item Type: Article (Research - C1)
ISSN: 2204-4604
Keywords: alien species, anthropogenic mass extinction crisis, biodiversity conservation, climate change, Delphi, IDEA, introduced species, threatening processes
Copyright Information: © CSIRO 2020
Funders: National Environmental Research Program
Projects and Grants: Threatened Species Recovery Hub and the Northern Australia Environmental Resources Hub
Date Deposited: 30 Nov 2020 21:58
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 100%
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