ORCID Profile
0000-0002-6010-7382
Current Organisations
The University of Canberra
,
University of Adelaide
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Publisher: Wiley
Date: 19-04-2020
DOI: 10.1111/JBI.13856
Publisher: Australian Museum
Date: 25-11-2020
Publisher: Authorea, Inc.
Date: 11-09-2023
Publisher: Wiley
Date: 22-06-2021
DOI: 10.1111/JFB.14701
Abstract: Flathead gobies (genus Glossogobius ) include c . 40 small‐ to medium‐sized benthic fishes found primarily in freshwater habitats across the Indo‐Pacific, having bio ersity value as well as cultural and economic value as food fishes, especially in developing countries. To help resolve considerable confusion regarding the identification of some of the larger‐growing Glossogobius species, a systematic framework was established using nuclear genetic markers, mitochondrial DNA barcoding and phenotypic evidence for a geographically widespread collection of in iduals from the waterways of tropical northern Australia. Species boundaries and distribution patterns were discordant with those previously reported, most notably for the tank goby Glossogobius giuris , which included a cryptic species. Genetic ergence was matched with accompanying unique visual characters that aid field identification. Additional taxonomic complexity was also evident, by comparison with DNA barcodes from international locations, suggesting that the specific names applicable for two of the candidate species in Australia remain unresolved due to confusion surrounding type specimens. Although flathead gobies are assumed to be widespread and common, this study demonstrates that unrealised taxonomic and ecological complexity is evident, and this will influence assessments of tropical bio ersity and species conservation. This study supports the need for taxonomic studies of freshwater fishes to underpin management in areas subject to significant environmental change.
Publisher: Magnolia Press
Date: 14-08-2023
DOI: 10.11646/ZOOTAXA.5330.1.1
Abstract: Many of Australia’s smaller marsupial species have been taxonomically described in just the past 50 years, and the Dasyuridae, a speciose family of carnivores, is known to harbour many cryptic taxa. Evidence from molecular studies is being increasingly utilised to help revise species boundaries and focus taxonomic efforts, and research over the past two decades has identified several undescribed genetic lineages within the dasyurid genus Planigale. Here, we describe two new species, Planigale kendricki sp. nov. (formerly known as ‘Planigale 1’) and P. tealei sp. nov. (formerly known as ‘Planigale sp. Mt Tom Price’). The two new species have broadly overlapping distributions in the Pilbara region of Western Australia. The new species are genetically distinct from each other and from all other members of the genus, at both mitochondrial and nuclear loci, and morphologically, in both external and craniodental characters. The new species are found in regional sympatry within the Pilbara but occupy different habitat types at local scales. This work makes a start at resolving the cryptic ersity within Planigale at a time when small mammals are continuing to decline throughout Australia.
Publisher: Springer Science and Business Media LLC
Date: 18-03-2019
DOI: 10.1038/S41598-019-40865-3
Abstract: Although hybridization between non-sibling species rarely results in viable or fertile offspring, it occasionally produces self-perpetuating or sexually-parasitic lineages in which ancestral genomes are inherited clonally and thus may persist as ‘ghost species’ after ancestor extinction. Ghost species have been detected in animals and plants, for polyploid and diploid organisms, and across clonal, semi-clonal, and even sexual reproductive modes. Here we use a detailed investigation of the evolutionary and taxonomic status of a newly-discovered, putative ghost lineage (HX) in the fish genus Hypseleotris to provide perspectives on several important issues not previously explored by other studies on ghost species, but relevant to ongoing discussions about their detection, conservation, and artificial re-creation. Our comprehensive genetic (allozymes, mtDNA) and genomic (SNPs) datasets successfully identified a threatened sexual population of HX in one tiny portion of the extensive distribution displayed by two hemi-clonal HX-containing lineages. We also discuss what confidence should be placed on any assertion that an ancestral species is actually extinct, and how to assess whether any putative sexual ancestor represents a pure remnant, as shown here, or a naturally-occurring resurrection via the crossing of compatible clones or hemi-clones.
Publisher: Cold Spring Harbor Laboratory
Date: 12-03-2023
DOI: 10.1101/2023.03.08.531828
Abstract: Anthropogenic climate change is forecast to drive regional climate disruption and instability across the globe. This issue is likely to be exacerbated within bio ersity hotspots, both due to the greater potential for species loss but also to the possibility that endemic lineages might not have experienced significant climatic variation in the past, limiting their evolutionary potential to respond to rapid climate change. We assessed the role of climatic stability on the accumulation and persistence of lineages in an obligate freshwater fish group endemic to a bio ersity hotspot. Southwest Western Australia (SWWA). Western pygmy perch ( Nannoperca vittata ) and little pygmy perch ( Nannoperca pygmaea ). We s led 33 in iduals from nine populations spanning the range of both study taxa to explore their phylogeographic history. Using a combination of genomic (ddRAD-seq) and environmental approaches, we investigated population ergence and phylogenetic relationships, delimited species and estimated changes in species distributions since the Pliocene. We identified two deep phylogroups comprising three ergent clusters, which showed no historical connectivity since the Pliocene. We conservatively suggest these represent three isolated species with additional intraspecific structure within one widespread species. All lineages showed long-term patterns of isolation and persistence owing to climatic stability. Our results highlighted the role of climatic stability in allowing the persistence of isolated lineages in the SWWA. This bio ersity hotspot is under compounding threat from ongoing climate change and habitat modification, which may further threaten previously undetected cryptic ersity across the region.
No related grants have been discovered for Mark Adams.