Climate extreme triggers cold-water community rescue

B. C. Ebner; J. Lobegeiger; J. Coe; S. Balcombe; D. Latimer; G. Pickering; J. C. Marshall

doi:10.1071/MF24046

RESEARCH ARTICLE (Open Access)

Previous Next Contents Vol 75(15)

Climate extreme triggers cold-water community rescue

B. C. Ebner

^A ^B ^* , J. Lobegeiger ^C , J. Coe ^D , S. Balcombe ^E , D. Latimer ^F , G. Pickering ^C and J. C. Marshall ^C ^F

+ Author Affiliations

- Author Affiliations

^A Centre for Tropical Water & Aquatic Ecosystem Research (TropWATER), James Cook University, Cairns, Qld, Australia.

^B New South Wales Department of Primary Industries, Grafton Fisheries Centre, Grafton, NSW 2460, Australia.

^C Department of Environment, Science and Innovation, Ecosciences Precinct, Block C, 41 Boggo Road, Dutton Park, GPO Box 2454, Brisbane, Qld 4001, Australia.

^D Jardini International, Brisbane, Qld, Australia.

^E Australian Rivers Institute, Griffith University, Nathan, Qld 4111, Australia.

^F Department of Regional Development, Manufacturing and Water, Level 3, 1 William Street, Brisbane, GPO Box 2247, Brisbane, Qld 4001, Australia.

^* Correspondence to: brendan.ebner@dpie.nsw.gov.au

Handling Editor: Paul Frazier

Marine and Freshwater Research 75, MF24046 https://doi.org/10.1071/MF24046

Submitted: 1 March 2024 Accepted: 29 August 2024 Published: 16 October 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

Mountain-top associated instream fauna with restricted ranges and limited dispersal capability are especially vulnerable to extinction under global warming and climate extremes.

Aims

Rescue and housing of multiple cold-water taxa on short timelines in reaction to extreme drought.

Methods

We undertook multi-species rescue (fishes: Gadopsis marmorata, n = 50; Galaxias olidus, n = 150; and a crayfish Euastacus sulcatus, n = 50) from the headwaters of the Condamine–Balonne catchment, temporarily holding animals in small (200 L) and large (1000 L) aquaria in single- and mixed-species contexts, at below 23°C.

Key results

Galaxias olidus was successfully kept in one of the small aquaria, but did not survive in mixed-species aquaria, partly being due to predation by other species. Euastacus sulcatus showed decreased survivorship at moulting (predation). Large Gadopsis marmorata (>100-mm total length, TL) was aggressive, whereas maintaining smaller individuals and using large aquaria served to dampen overall aggression levels.

Conclusions

Holding mixed taxa following field rescues requires attention to detail, including developmental-stage combinations within and across species, enclosure volume and availability of structure.

Implications

The simultaneous rescue of multiple co-occurring endemic taxa represents a promising aspect of research and adaptive management in the era of global climate change.

Keywords: bureaucracy, community rescue, drought, Euastacus, Gadopsis, Galaxias, moulting, predation, threatened species.

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