| Autor: |
Stocks, Jerom R., Ellis, Iain M., van der Meulen, Dylan E., Doyle, Jonathon I., Cheshire, Katherine J. M. |
| Zdroj: |
Marine & Freshwater Research; 2022, Vol. 73 Issue 2, p159-177, 19p |
| Abstrakt: |
Understanding the impacts of extreme events is essential to effective fisheries management. During the summer of 2018–19 millions of native fish died in Lower Darling– Baaka River adjacent to Menindee, New South Wales, Australia. Hypoxia during a period of protracted low flow, triggered by climatic events, was responsible for the fish kills. From June 2019 to March 2020, further broader-scale fish kills occurred throughout ~600 km of the Darling– Baaka River as disconnected refuge pools contracted and water quality deteriorated. This study examined the status of the remnant fish populations, compared the fish assemblage of the Menindee fish death reach with an unaffected reach and monitored change of the fish community over 18 months after the initial fish kills. Significantly lower abundances of Murray cod (Maccullochella peelii), bony herring (Nematalosa erebi), carp gudgeon (Hypseleotris spp.) and freshwater prawn (Macrobrachium australiense) were captured within the Menindee fish death reach compared with the unaffected reach. Varied responses were observed in species abundances within the affected reach in the 18 months after the initial fish kills, attributed to the various life-history traits and reproductive strategies. The results presented highlight a fish community in continued stress. Continued monitoring will guide and track the effectiveness of recovery management interventions in the region. Millions of native fish died in mass fish kill events from 2018 to 2020 in the Darling– Baaka River, Australia. This study examined the impacts of these fish kills and short-term changes in the fish community after the initial fish deaths. Differences in species abundance, diversity and size composition illustrate the dramatic extent of the effect of the fish kills on the fish community. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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