Does the choice of climate baseline matter in ecological niche modelling?

Roubicek, A.J., VanDerWal, J., Beaumont, L.J., Pitman, A.J., Wilson, P., and Hughes, L. (2010) Does the choice of climate baseline matter in ecological niche modelling? Ecological Modelling, 221 (19). pp. 2280-2286.

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Ecological niche models (ENMs) have multiple applications in ecology, evolution and conservation planning. They relate the known locations of a species to characteristics of its environment (usually climate) over its geographical range. Most ENMs are trained using standard 30-year (1961–1990) or 50-year (1951–2000) baselines to represent current climate conditions. Species occurrence records used as input to the models, however, are frequently collected from time periods that differ from those from which the climate is derived. Since climate variability can be significant within and outside baselines, and the distributions of some plants and animals (e.g., annual plants, insects) can adjust to environmental conditions on much shorter time scales, this mismatch between collection records and climatic baselines may affect the utility and accuracy of model outputs. We investigated how the choice of baseline periods influenced modelling efforts, anticipating that climate baselines derived from the same temporal period as the species records would yield improved ENMs. Ten simulated species’ distributions were modelled using an ENM (Maxent) for (a) occurrences and climates within the same temporal period, based on eighteen 10-year baselines within the 20th century and (b) all available samples and climate baselines from 1951–2000 and 1961–1990. Each model was projected onto all the available 10-year climate scenarios and compared to the models trained on the corresponding scenario. We show that temporal mismatches of species occurrences and climate baselines can result in significantly poorer distribution models. Such temporal mismatch may be unavoidable for many studies, but we emphasize here the need to match the time range of samples and climate data whenever possible.

Item ID: 16559
Item Type: Article (Research - C1)
ISSN: 1872-7026
Keywords: climate baseline; ecological niche model; Hellinger distance; I-statistic; model projections
Date Deposited: 06 May 2011 23:06
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060208 Terrestrial Ecology @ 70%
06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069902 Global Change Biology @ 30%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960501 Ecosystem Assessment and Management at Regional or Larger Scales @ 60%
96 ENVIRONMENT > 9603 Climate and Climate Change > 960303 Climate Change Models @ 40%
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