Evolutionary refugia and ecological refuges: key concepts for conserving Australian arid zone freshwater biodiversity under climate change
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Open Access
- 18 April 2013
- journal article
- review article
- Published by Wiley in Global Change Biology
- Vol. 19 (7), 1970-1984
- https://doi.org/10.1111/gcb.12203
Abstract
Refugia have been suggested as priority sites for conservation under climate change because of their ability to facilitate survival of biota under adverse conditions. Here, we review the likely role of refugial habitats in conserving freshwater biota in arid Australian aquatic systems where the major long-term climatic influence has been aridification. We introduce a conceptual model that characterizes evolutionary refugia and ecological refuges based on our review of the attributes of aquatic habitats and freshwater taxa (fishes and aquatic invertebrates) in arid Australia. We also identify methods of recognizing likely future refugia and approaches to assessing the vulnerability of arid-adapted freshwater biota to a warming and drying climate. Evolutionary refugia in arid areas are characterized as permanent, groundwater-dependent habitats (subterranean aquifers and springs) supporting vicariant relicts and short-range endemics. Ecological refuges can vary across space and time, depending on the dispersal abilities of aquatic taxa and the geographical proximity and hydrological connectivity of aquatic habitats. The most important are the perennial waterbodies (both groundwater and surface water fed) that support obligate aquatic organisms. These species will persist where suitable habitats are available and dispersal pathways are maintained. For very mobile species (invertebrates with an aerial dispersal phase) evolutionary refugia may also act as ecological refuges. Evolutionary refugia are likely future refugia because their water source (groundwater) is decoupled from local precipitation. However, their biota is extremely vulnerable to changes in local conditions because population extinction risks cannot be abated by the dispersal of individuals from other sites. Conservation planning must incorporate a high level of protection for aquifers that support refugial sites. Ecological refuges are vulnerable to changes in regional climate because they have little thermal or hydrological buffering. Accordingly, conservation planning must focus on maintaining meta-population processes, especially through dynamic connectivity between aquatic habitats at a landscape scale.Keywords
This publication has 70 references indexed in Scilit:
- Incorporating climate change adaptation into national conservation assessmentsGlobal Change Biology, 2011
- Evidence for population fragmentation within a subterranean aquatic habitat in the Western Australian desertHeredity, 2011
- Protecting the innocent: studying short-range endemic taxa enhances conservation outcomesInvertebrate Systematics, 2011
- Islands of water in a sea of dry land: hydrological regime predicts genetic diversity and dispersal in a widespread fish from Australia’s arid zone, the golden perch (Macquaria ambigua)Molecular Ecology, 2010
- Climate change and freshwater ecosystems: impacts across multiple levels of organizationPhilosophical Transactions B, 2010
- VIEWPOINT. Is the Australian subterranean fauna uniquely diverse?Invertebrate Systematics, 2010
- Phylogeographic insights into cryptic glacial refugiaTrends in Ecology & Evolution, 2008
- Birth of a biome: insights into the assembly and maintenance of the Australian arid zone biotaMolecular Ecology, 2008
- Molecular phylogeny and biogeography of spring-associated hydrobiid snails of the Great Artesian Basin, AustraliaMolecular Phylogenetics and Evolution, 2005
- Phylogeography of the widespread Australian freshwater prawn, Macrobrachium australiense (Decapoda, Palaemonidae)Journal of Biogeography, 2004