Abstract
The freshwater isopod Paramphisopus palustris is ubiquitous and abundant in the groundwater-fed wetlands of the Swan Coastal Plain around Perth, Western Australia. Taxonomically, an additional variety (P. palustris fairbridgei) and species (P. montanus) are recognized from geographically outlying localities. Here a 486 bp fragment of cytochrome c oxidase subunit I (COI) mtDNA was sequenced in 68 individuals from 23 localities in order to evaluate the accepted taxonomy, to examine the evolutionary history of the species, and to identify lineages to prioritize conservation of wetlands already substantially modified. MtDNA showed individual populations to be largely distinct and differentiated. The 41 unique haplotypes formed seven independent, geographically defined networks. Phylogenetic analysis retrieved corresponding subclades, with three well-supported larger clades occurring (1) north of the Swan River, (2) south of the Swan River, and (3) in an area further south. A clear pattern of isolation by distance was detected suggesting an ancient serial founder event, with the pattern possibly persisting in the face of limited gene flow through priority effects. The possibility of incipient speciation, the monophyly of the recognized subspecies and the paraphyly of P. palustris with respect to P. montanus, suggest that the current taxonomy is invalid and requires re-examination. Divergences suggest a mid- to early Pliocene divergence of the major clades, with early Pliocene divergences among subclades probably driven by documented intense arid periods. Lineages are present in wetlands in geologically younger environments suggesting in situ survival and persistence. Seven Evolutionarily Significant Units were identified for the conservation of Paramphisopus, two of which are not currently represented in conservation reserves. With increased water demand and the negative impact of surrounding land-use, the current study provides a first phylogeographic assessment of conservation priorities for wetlands of the Swan Coastal Plain.
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Acknowledgements
This study was funded by Australian Biological Resources Study (ABRS) Participatory Program Grants (203-032 and 204-010), provided by the Department of the Environment and Heritage. The senior author was supported by a South African National Research Foundation Postdoctoral Scholarship for Research Abroad (GUN 2062031) and hosted by both the School of Animal Biology and the Centre of Excellence in Natural Resource Management, The University of Western Australia. The authors thank Dennis and Leisha Davis, Rebecca Dobbs, Geraldine Janicke, Anna Price and Ben Puglisi for providing assistance in the field, laboratory or in the preparation of the manuscript. The authors are grateful for the comments, discussion and suggestions provided by the population genetics group of the School of Animal Biology. We thank the editor and two anonymous reviewers whose comments vastly improved the manuscript.
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Gouws, G., Stewart, B.A. From genetic structure to wetland conservation: a freshwater isopod Paramphisopus palustris (Phreatoicidea: Amphisopidae) from the Swan Coastal Plain, Western Australia. Hydrobiologia 589, 249–263 (2007). https://doi.org/10.1007/s10750-007-0742-2
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DOI: https://doi.org/10.1007/s10750-007-0742-2