Range‐wide population genetics study informs on conservation translocations and reintroductions for the endangered Murray hardyhead (<scp><i>Craterocephalus fluviatilis</i></scp>)

Thiele, Samantha; Adams, Mark A.; Hammer, Michael P.; Wedderburn, Scotte D.; Whiterod, Nick S.; Unmack, Peter J.; Sasaki, Minami; Beheregaray, Luciano B.

doi:10.1002/aqc.3408

Cited by 3 publications

(3 citation statements)

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“…The survey methodology established in the present study, combined with other techniques, such as environmental DNA that has been applied to the region previously (Shaw et al, 2016), can form the basis for assessing the reintroduction objectives. The demonstrated successful reintroduction of similarly imperilled small‐bodied fish species in the region, such as N. australis (Beheregaray et al, 2021) and C. fluviatilis (Thiele et al, 2020), and elsewhere (e.g. Oregon chub Oregonichthys crameri ; DeHaan et al, 2016), should serve as motivation for the restoration of N. obscura in the MDB.…”

Section: Discussionmentioning

confidence: 99%

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Occupancy modelling confirms the first extirpation of a freshwater fish from one of the world's largest river systems

Wedderburn

Whiterod²,

Vilizzi

2021

Aquatic Conservation

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Numerous human‐induced changes to freshwater ecosystems are implicated in the loss of biodiversity, including fish extinctions. Dams and weirs have profoundly altered the ecological character of the Murray–Darling Basin (MDB), one of the world's largest river systems, which discharges at the mouth of the River Murray in South Australia. These impacts are evident in the Ramsar‐listed final reaches of the river, where regulation, drought, and flow reductions over recent decades have led to the collapse of freshwater fish populations, including Yarra pygmy perch (Nannoperca obscura), which is Endangered on the International Union for Conservation of Nature Red List of Threatened Species. Nannoperca obscura occurs in several major catchments in south‐eastern Australia, but the genetically unique population in the MDB only inhabits wetlands near the terminus of the River Murray where wild populations were last recorded in 2008 approaching the end of a prolonged drought. This study involved repeated surveys targeting N. obscura to evaluate its occupancy in the MDB while accounting for imperfect detection. The surveys failed to find N. obscura despite regular detection of the closely related southern pygmy perch (Nannoperca australis), which provides a proxy for the congener. This study presents strong evidence that N. obscura is absent in the survey region, thereby inferring the first freshwater fish extirpation from the MDB. The outcomes of this study should prompt responses required to aid the species' population recovery and present a reliable approach to confirm the status of freshwater fishes for conservation management.

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Section: Discussionmentioning

confidence: 99%

“…Beheregaray et al, 2021) and C. fluviatilis(Thiele et al, 2020), and elsewhere (e.g. Oregon chub Oregonichthys crameri; DeHaan et al, 2016), should serve as motivation for the restoration of N. obscura in the MDB.…”

mentioning

confidence: 99%

Occupancy modelling confirms the first extirpation of a freshwater fish from one of the world's largest river systems

Wedderburn

Whiterod²,

Vilizzi

2021

Aquatic Conservation

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“…Effective population size and demographic rate estimation can be performed with microsatellites, e.g., in wild Atlantic sturgeon, Acipenser oxyrinchus oxyrinchus [ 250 ]. Translocations and reintroductions have been used to prevent the extinction of freshwater fish populations of the hardyhead, C. fluviatilis , in The Murray–Darling Basin in south-eastern Australia [ 203 ]. The guided artificial gene flow strategy was based on genetic analyses of 14 microsatellite loci and enabled the rescue of this species from extinction.…”

Section: Conservation Geneticsmentioning

confidence: 99%

Microsatellites as Molecular Markers with Applications in Exploitation and Conservation of Aquatic Animal Populations

Wenne

2023

Genes

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A large number of species and taxa has been studied for genetic polymorphism. Microsatellites have been known as hypervariable neutral molecular markers with the highest resolution power in comparison with any other markers. However, the discovery of a new type of molecular marker—single nucleotide polymorphism (SNP) has put the existing applications of microsatellites to the test. To ensure good resolution power in studies of populations and individuals, a number of microsatellite loci from 14 to 20 was often used, which corresponds to about 200 independent alleles. Recently, these numbers have tended to be increased by the application of genomic sequencing of expressed sequence tags (ESTs), and the choice of the most informative loci for genotyping depends on the aims of research. Examples of successful applications of microsatellite molecular markers in aquaculture, fisheries, and conservation genetics in comparison with SNPs have been summarized in this review. Microsatellites can be considered superior markers in such topics as kinship and parentage analysis in cultured and natural populations, the assessment of gynogenesis, androgenesis and ploidization. Microsatellites can be coupled with SNPs for mapping QTL. Microsatellites will continue to be used in research on genetic diversity in cultured stocks, and also in natural populations as an economically advantageous genotyping technique.

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Reply to the discussion by Gell and Finlayson (2023)

Bourman

Murray-Wallace

Wilson

et al. 2023

Australian Journal of Earth Sciences

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Range‐wide population genetics study informs on conservation translocations and reintroductions for the endangered Murray hardyhead (Craterocephalus fluviatilis)

Cited by 3 publications

References 91 publications

Occupancy modelling confirms the first extirpation of a freshwater fish from one of the world's largest river systems

Occupancy modelling confirms the first extirpation of a freshwater fish from one of the world's largest river systems

Microsatellites as Molecular Markers with Applications in Exploitation and Conservation of Aquatic Animal Populations

Reply to the discussion by Gell and Finlayson (2023)

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