04/12/2024
Three-quarters of Australia’s freshwater fish species are found nowhere else. A team of 52 Australian freshwater fish experts undertook the first comprehensive assessment of these unique fishes, examining extinction risks and drivers of decline, before reviewing existing conservation measures.
Paywall - https://www.sciencedirect.com/science/article/abs/pii/S0006320724004051
Sci-comm post - https://theconversation.com/troubled-waters-how-to-stop-australias-freshwater-fish-species-from-going-extinct-242950
The authors of this study found that more than one-third of Australia's freshwater fish are at risk of extinction, including 35 species not even listed as threatened. Dozens of species could become extinct over the next decade.
"The study also reveals Australia has been putting its eggs in the wrong basket for conservation by taking actions that don’t address immediate threats, such as pest species and changes in stream flows. Our research points to more effective solutions if governments are willing to step-up their efforts."
Factsheet from Biodiversity Council (AU) - Preventing extinctions of Australian freshwater fishes: A national assessment - https://biodiversitycouncil.org.au/resources/factsheet-preventing-extinctions-of-australian-freshwater-fishes
𝗥𝗲𝘀𝗲𝗮𝗿𝗰𝗵 𝗧𝗶𝘁𝗹𝗲
Troubled waters in the land down under: Pervasive threats and high extinction risks demand urgent conservation actions to protect Australia's native freshwater fishes
𝗖𝗶𝘁𝗮𝘁𝗶𝗼𝗻
Mark Lintermans, Maiko Lutz, Nick S. Whiterod, Bernd Gruber, Michael P. Hammer, Mark J. Kennard, David L. Morgan, Tarmo A. Raadik, Peter Unmack, Steven Brooks, Brendan C. Ebner, Dean Gilligan, Gavin L. Butler, Glenn Moore, Culum Brown, Rob Freeman, Adam Kerezsy, Chris M. Bice, Matthew C. Le Feuvre, Stephen Beatty, Angela H. Arthington, John Koehn, Helen K. Larson, Rhys Coleman, Rupert Mathwin, Luke Pearce, Zeb Tonkin, Andrew Bruce, Tom Espinoza, Pippa Kern, Jason A. Lieschke, Keith Martin, John Sparks, Daniel J. Stoessel, Scotte D. Wedderburn, Hugh Allan, Pam Clunie, Bernie Cockayne, Iain Ellis, Scott Hardie, Wayne Koster, Karl Moy, David Roberts, David Schmarr, Joanne Sharley, David Sternberg, Sylvia Zukowski, Chris Walsh, Brenton Zampatti, James J. Shelley, Catherine Sayer, David G. Chapple, Troubled waters in the land down under: Pervasive threats and high extinction risks demand urgent conservation actions to protect Australia's native freshwater fishes, Biological Conservation, Volume 300, 2024, 110843, ISSN 0006-3207, https://doi.org/10.1016/j.biocon.2024.110843.
𝗔𝗯𝘀𝘁𝗿𝗮𝗰𝘁
We conducted the first comprehensive global assessment of the extinction risk of Australia's native freshwater fishes.
Using International Union for Conservation of Nature (IUCN) criteria, 37 % (88 species) of the 241 assessed species were threatened (Critically Endangered, Endangered or Vulnerable), with one being Extinct. Lepidogalaxiidae and Neoceratodontidae had the highest level of threat (100 %, both single species families), followed by Galaxiidae (78 % of 40 species), Percichthyidae (62 % of 22 species) and Melanotaeniidae (53 % of 19 species). Northern Australia supported greater species richness, while a concentration of threatened species occurred in the more human-populated areas across southern and eastern drainage divisions, including South West Coast (55 % of species assessed as threatened), Tasmania (54 %) and South East Coast (Victoria) (45 %). Most threatened freshwater fishes qualified for listing based on their restricted geographic ranges (Criterion B: 70 % of all assessments; Criterion D2: 7 %) although population size reduction (Criterion A) was identified in 21 % of species assessments.
Key threats to species included invasive and other problematic native species, genes and diseases (92 % of threatened, Near Threatened or Data Deficient species), natural system modifications (82 %), and climate change and severe weather (54 %). Despite the high level of extinction risk, implemented conservation measures for threatened species are presently very limited. A further 17 species were assessed as Near Threatened.
This study highlights the imperilled nature of Australian native freshwater fishes and emphasises that targeted conservation measures are urgently needed to avoid imminent extinctions.
𝗣𝗵𝗼𝘁𝗼 𝗖𝗿𝗲𝗱𝗶𝘁
Mapping freshwater fish extinction risk reveals fish are in danger right around Australia. M. Lintermans, N. Whiterod and J. Dielenberg, CC BY-SA.
Copyright © 2024 the Author(s). Published in Biological Conservation journal. This paper is released under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. https://creativecommons.org/licenses/by/4.0/