A novel approach to quantify and locate potential microrefugia using topoclimate, climate stability, and isolation from the matrix

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dc.contributor.author Ashcroft, MB
dc.contributor.author Gollan, JR
dc.contributor.author Warton, DI
dc.contributor.author Ramp, D
dc.date.accessioned 2012-10-12T03:33:19Z
dc.date.issued 2012-06
dc.identifier.citation Global Change Biology, 2012, 18 (6), pp. 1866 - 1879
dc.identifier.issn 1354-1013
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/18112
dc.description.abstract Ecologists are increasingly recognizing the conservation significance of microrefugia, but it is inherently difficult to locate these small patches with unusual climates, and hence they are also referred to as cryptic refugia. Here we introduce a new methodology to quantify and locate potential microrefugia using fine-scale topoclimatic grids that capture extreme conditions, stable climates, and distinct differences from the surrounding matrix. We collected hourly temperature data from 150 sites in a large (200 km by 300 km) and diverse region of New South Wales, Australia, for a total of 671 days over 2 years. Sites spanned a range of habitats including coastal dune shrublands, eucalypt forests, exposed woodland ridges, sheltered rainforest gullies, upland swamps, and lowland pastures. Climate grids were interpolated using a regional regression approach based on elevation, distance to coast, canopy cover, latitude, cold-air drainage, and topographical exposure to winds and radiation. We identified extreme temperatures on two separate climatic gradients: the 5th percentile of minimum temperatures and the 95th percentile of maximum temperatures. For each gradient, climatic stability was assessed on three different time scales (intra-seasonal, intra-annual and inter-annual). Differences from the matrix were assessed using a moving window with a 5 km radius. We averaged the Z-scores for these extreme, stable and isolated climates to identify potential locations of microrefugia. We found that our method successfully predicted the location of communities that were considered to occupy refugia, such as rainforests that have progressively contracted in distribution over the last 2.5 million years, and alpine grasslands that have contracted over the last 15 thousand years. However, the method was inherently sensitive to the gradient selected and other aspects of the modelling process. These uncertainties could be dealt with in a conservation planning context by repeating the methodology with various parameterizations and identifying areas that were consistently identified as microrefugia. © 2012 Blackwell Publishing Ltd.
dc.language eng
dc.relation.isbasedon 10.1111/j.1365-2486.2012.02661.x
dc.title A novel approach to quantify and locate potential microrefugia using topoclimate, climate stability, and isolation from the matrix
dc.type Journal Article
dc.description.version Published
dc.parent Global Change Biology
dc.journal.volume 6
dc.journal.volume 18
dc.journal.number 6 en_US
dc.publocation UK en_US
dc.identifier.startpage 1866 en_US
dc.identifier.endpage 1879 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.for 0502 Environmental Science and Management
dc.personcode 113573
dc.personcode 114443
dc.percentage 50 en_US
dc.classification.name Environmental Science and Management en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Climate change
dc.description.keywords Climatic variability
dc.description.keywords Cryptic refugia
dc.description.keywords Landscape scale
dc.description.keywords Microclimate
dc.description.keywords Topoclimatic grids
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - Environmental Science
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of the Environment (ID: 344)

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