Cryptic diversity within two widespread diadromous freshwater fishes (Teleostei: Galaxiidae)

Charlotte Jense; Mark Adams; Tarmo A Raadik; Jonathan M Waters; David L Morgan; Leon A Barmuta; Scott A Hardie; Bruce E Deagle; Christopher P Burridge

doi:10.1002/ece3.11201

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Cryptic diversity within two widespread diadromous freshwater fishes (Teleostei: Galaxiidae)

Journal article

Open access

Peer reviewed

Cryptic diversity within two widespread diadromous freshwater fishes (Teleostei: Galaxiidae)

Charlotte Jense, Mark Adams, Tarmo A Raadik, Jonathan M Waters, David L Morgan, Leon A Barmuta, Scott A Hardie, Bruce E Deagle and Christopher P Burridge

Ecology and evolution, Vol.14(5), e11201

2024

DOI: https://doi.org/10.1002/ece3.11201

PMID: 38799386

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Abstract

gene flow

geographical barriers

imperilled

colonisation

species boundaries

Galaxias

delineation

Identification of taxonomically cryptic species is essential for the effective conservation of biodiversity. Freshwater-limited organisms tend to be genetically isolated by drainage boundaries, and thus may be expected to show substantial cryptic phylogenetic and taxonomic diversity. By comparison, populations of diadromous taxa, that migrate between freshwater and marine environments, are expected to show less genetic differentiation. Here we test for cryptic diversity in Australasian populations (both diadromous and non-diadromous) of two widespread Southern Hemisphere fish species, and . Both mtDNA and nuclear markers reveal putative cryptic species within these taxa. The substantial diversity detected within may be explained by its strong climbing ability which allows it to form isolated inland populations. In island populations, similarly show deeper genetic divergence than those of , which may be explained by the greater abundance of larvae in the sea allowing more ongoing dispersal. Our study highlights that even widespread, 'high-dispersal' species can harbour substantial cryptic diversity and therefore warrant increased taxonomic and conservation attention.

Details

Title: Cryptic diversity within two widespread diadromous freshwater fishes (Teleostei: Galaxiidae)
Authors/Creators: Charlotte Jense - University of Tasmania
Mark Adams - The University of Adelaide
Tarmo A Raadik - Arthur Rylah Institute for Environmental Research
Jonathan M Waters - University of Otago
David L Morgan - Murdoch University
Leon A Barmuta - University of Tasmania
Scott A Hardie - University of Tasmania
Bruce E Deagle - Commonwealth Scientific and Industrial Research Organisation
Christopher P Burridge - University of Tasmania
Publication Details: Ecology and evolution, Vol.14(5), e11201
Publisher: John Wiley & Sons Ltd.
Identifiers: 991005668368607891
Murdoch Affiliation: Centre for Sustainable Aquatic Ecosystems
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.64 Phylogenetics & Genomics; 3.64.71 Genetic Diversity
Web Of Science research areas: Ecology; Evolutionary Biology
ESI research areas: Environment/Ecology