Assessing how environmental heterogeneity influences gene flow and adaptive evolution in terrestrial vertebrate species: Towards behavioral landscape genetics

Authors and Affiliations: 

Femke J. Pflüger & Niko Balkenhol

Dept. of Forest Zoology & Forest Conservation

University of Goettingen

Buesgenweg 3

37077 Goettingen

Germany

Abstract: 

A current emphasis of landscape genetics lies in assessing how landscape resistance affects dispersal movements and realized gene flow. This approach emphasizes the transient phase of dispersal, but neglects the stages of departure and settlement. Here, we outline how landscape characteristics other than matrix resistance can directly and indirectly shape spatial patterns of genetic variation by influencing the dispersal behavior of animals living in complex environments. These landscape-genetic relationships can arise through (i) density-dependent emi- and immigration behavior that is affected by local habitat quality and carrying capacity, (ii) post-dispersal settlement behavior that depends on natal habitat preference induction (NHPI), and (iii) mate-choice in response to parasite-mediated selection that differs spatially with varying environmental conditions. We outline how such landscape-genetic relationships can be analyzed statistically, and how considering them could further increase the utility of landscape genetics for research in conservation (e.g., corridor design), ecology (e.g., predicting species distribution under climate change), and evolution (e.g., local adaptation, speciation). Finally, we discuss the importance of understanding the underlying behavioral mechanism when interpreting statistical results obtained in landscape genetics, and highlight future research avenues that combine genetic data with detailed information on individual movement and reproduction to fully assess the interplay between environmental heterogeneity, genetic variation, and the eco-evolutionary dynamics of wildlife populations.

References: 
  1. Altwegg, R., et al. (2012) Density-dependent dispersal and the speed of range expansions. Diversity and Distributions 19, 60-68
  2. Baguette, M., et al. (2013) Individual dispersal, landscape connectivity and ecological networks. Biological reviews of the Cambridge Philosophical Society, 310-326
  3. Balkenhol, N. et al. (2009) Identifying future research needs in landscape genetics: where to from here? Landscape Ecology 24: 455–463.
  4. Baratti, M., et al. (2012) MHC genotype predicts mate choice in the ring-necked pheasant Phasianus colchicus. Journal of evolutionary biology 25, 1531-1542
  5. Bonte, D., et al. (2012) Costs of dispersal. Biological reviews of the Cambridge Philosophical Society 87, 290-312
  6. Davis, J.M., and Stamps, J.a. (2004) The effect of natal experience on habitat preferences. Trends in ecology & evolution 19, 411-416
  7. Froeschke, G., et al. (2010) Effects of precipitation on parasites burden along a natural climatic gradient in southern Africa - implications for possible shifts in infestation patterns due to global changes. Oikos 119, 1029-1039
  8. Horskins, K., et al. (2006) Corridors and connectivity: when use and function do not equate. Landscape Ecology 21, 641-655
  9. Matthysen, E. (2012) Muticausality of dispersal: a review. In Dispersal ecology and evolution (Clobert, J., et al., eds), 3-18, Oxford University Press
  10. Pilot, M., et al. (2012) Dietary differentiation and the evolution of population genetic structure in a highly mobile carnivore. PloS one 7, e39341
  11. Spear, S.F., et al. (2010) Use of resistance surfaces for landscape genetic studies: considerations for parameterization and analysis. Molecular ecology 19, 3576-3591
  12. Zeller, K.a., et al. (2012) Estimating landscape resistance to movement: a review. Landscape Ecology 27, 777-797