- Publication : 13 mai 2020
2 octobre 2020, 16h00 (diffusion en visioconférence).
The contribution of contemporary environments & a legacy of range expansion to the evolution of plant reproduction.
Link to seminar will be posted here
Department of Biology, University of Virginia, USA
Variation in plant mating systems is often thought to reflect local pollination environments. However, it may also be associated with historical processes, in particular range expansion. We evaluate a geographic pattern in mating system in Campanula americana, determining the explanatory value of contemporary pollinators and historical processes identified by patterns of genetic variation and load. We find a strong relationship between distance from glacial refugia and mating system, supporting the importance of historic factors in adaptive evolution. Studying mating systems in a phylogeographic framework permits an understanding of how current patterns of evolution may be contingent upon the past; this approach is increasingly relevant to predict the consequences of population fragmentation and range shifts associated with warming climates, areas addressed in ongoing research.
1 Prior, C. J., N. C. Layman, M. H. Koski, L. F. Galloway and J. W. Busch. 2020. Species range expansion involved colonization from two mid-latitude origins in a North American forest herb. Molecular Ecology, in press.
2 Koski, M. H. and L. F. Galloway. 2020. Temperature and historical colonization shape geographic variation in petal reflectance and coloration. Frontiers in Plant Science 11: 991.
3 Koski, M. H., C. J. Prior, N. C. Layman, J. W. Busch and L. F. Galloway. 2019. Selfing ability and drift load evolve with range expansion. Evolution Letters 3: 500-512.