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Tracking shifting range margins using geographical centroids of metapopulations weighted by population density

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  • Watts, Michael J.
  • Fordham, Damien A.
  • Akçakaya, H. Resit
  • Aiello-Lammens, Matthew E.
  • Brook, Barry W.

Abstract

Spatially explicit metapopulation models are being used with increasing frequency to forecast changes in species’ abundance in response to future climate and other environmental changes. However, to date, they have not quantified shifts in the margins of the metapopulation range – an important dynamic for understanding species responses to climate change. Here we describe a method for calculating shifts in a metapopulation's range-margin based on the geographical centroid of spatially distributed patches, where the population abundance of each patch or each landscape grid cell is used to weight its geographical (X–Y) coordinate. We evaluated our approach against a detailed virtual example and two real-world applications (threatened mountain hare in Britain and invasive European rabbits in Australia). We also investigated smoothing techniques to better portray overall trends in range changes through time. These procedures were implemented in a new user-friendly software tool, which can process the output file of the popular RAMAS Metapop software. We develop a scenario analysis to show how our weighted-centroid approach can be used to recommend species management options that are most important to long-term population viability (e.g., to choose between increasing connectivity, habitat quality or translocation) under different demographic scenarios. We show that calculating a smoothed time series of weighted centroids from a spatially explicit metapopulation model provides: (i) a useful way to identify the demographic momentum, or momentum of population shift, of the metapopulation (rather than just spatial aggregation or individual-patch behaviour) of a species through geographic space in response to climate change; and (ii) an informative metric of range movement that complements predictions of change in range area or total population size, and extirpation or founding of patches.

Suggested Citation

  • Watts, Michael J. & Fordham, Damien A. & Akçakaya, H. Resit & Aiello-Lammens, Matthew E. & Brook, Barry W., 2013. "Tracking shifting range margins using geographical centroids of metapopulations weighted by population density," Ecological Modelling, Elsevier, vol. 269(C), pages 61-69.
    • Handle: RePEc:eee:ecomod:v:269:y:2013:i:c:p:61-69
    DOI: 10.1016/j.ecolmodel.2013.08.010
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    References listed on IDEAS

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    1. Chris D. Thomas & Alison Cameron & Rhys E. Green & Michel Bakkenes & Linda J. Beaumont & Yvonne C. Collingham & Barend F. N. Erasmus & Marinez Ferreira de Siqueira & Alan Grainger & Lee Hannah & Lesle, 2004. "Extinction risk from climate change," Nature, Nature, vol. 427(6970), pages 145-148, January.
    2. Chris D. Thomas & Jack J. Lennon, 1999. "Birds extend their ranges northwards," Nature, Nature, vol. 399(6733), pages 213-213, May.
    3. Scott R. Loarie & Philip B. Duffy & Healy Hamilton & Gregory P. Asner & Christopher B. Field & David D. Ackerly, 2009. "The velocity of climate change," Nature, Nature, vol. 462(7276), pages 1052-1055, December.
    4. D. A. Fordham & H. R. Akçakaya & B. W. Brook & A. Rodríguez & P. C. Alves & E. Civantos & M. Triviño & M. J. Watts & M. B. Araújo, 2013. "Adapted conservation measures are required to save the Iberian lynx in a changing climate," Nature Climate Change, Nature, vol. 3(10), pages 899-903, October.
    5. John Harte & Annette Ostling & Jessica L. Green & Ann Kinzig, 2004. "Climate change and extinction risk," Nature, Nature, vol. 430(6995), pages 34-34, July.
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    Cited by:

    1. Pilowsky, Julia A. & Manica, Andrea & Brown, Stuart & Rahbek, Carsten & Fordham, Damien A., 2022. "Simulations of human migration into North America are more sensitive to demography than choice of palaeoclimate model," Ecological Modelling, Elsevier, vol. 473(C).

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