Trends in Ecology & Evolution
OpinionFine-grain modeling of species’ response to climate change: holdouts, stepping-stones, and microrefugia
Section snippets
A small revolution in climate-change biology
Mounting evidence from paleoecology suggests that small pockets of vegetation occupying microrefugia played a pivotal role in plant responses to rapid climate change during the transition from the Last Glacial Maximum (LGM) [1]. Pioneering work suggests that microclimates will have a similar role under future, human-induced climate change 2, 3. Modeled estimates of range shifts, population dynamics, and extinctions may all need to be reassessed in light of such fine-grain effects, with
Organism–environment interactions at fine scales
Environmental factors, including air and surface temperature, precipitation, radiation, and wind speed, interact with organismal phenotypes to create complex mosaics of temperature and water balance [6]. The interaction of multiple environmental factors can cause unexpected biotic responses to climate change, such as plants moving downhill in response to cold-air pooling [7]. Differences in microhabitat affinity can influence the strength of species interactions [8].
Environmental interactions
How do we talk about it?
‘Microrefugia’ is a term borrowed from paleoecology that describes isolated populations surviving in unusual microclimates relative to the surrounding landscape [19] or the places in which such populations persist [20]. As we describe below, the population-centered definition is more useful for analysis of the future. Such populations may help a species endure a period of unfavorable climate 19, 20, 21, or a glacial or interglacial climate excursion [1].
However, future climates are likely to be
What scale is appropriate?
Identifying holdouts, stepping-stones, and microrefugia requires models of future climate and models of biological response. Climate models are needed that can resolve microclimates capable of harboring small populations, areas as little as a few tens of square meters for insects and understory plants, to hundreds of square meters for dominant tree species. Biological models are needed to resolve the intersection of the environmental niche requirements of species with microclimates, the ability
Conservation consequences
Conservation planners need to be aware that microrefugia are unlikely under all but a few future climate scenarios, so that planning for holdouts and stepping-stones should be the major focus of protected areas and species plans. Continuing climate change produces fading holdouts, whereas climate reversal produces persistent microrefugia. All RCP scenarios project continuing climate change without reversal, except for a few RCP2.6 simulations (Figure 2). This indicates that microrefugia will be
What's next?
Next-generation models are emerging that can address the effects of dispersal, species interactions, population dynamics, and disturbance on holdouts and stepping-stones. LANDIS-II [50] and BioMove [51], for example, provide flexible, modular model architecture that allows users to vary spatial and temporal grain and extent and to select custom extensions to simulate a range of mechanistic detail, depending on the study objective. Climatic effects on fire regimes can be simulated, and species
Acknowledgement
We gratefully acknowledge funding support from the National Science Foundation Macrosystems Biology program NSF #EF 1065864 and the insights and comments of our collaborators in that project, Frank Davis, Janet Franklin, Alex Hall, Kelly Redmond, Alan Flint, Helen Regan, Lynn Sweet, and John Dingman. The work was also supported by NSF grant EF-1065638.
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