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Harter DE, Thiv M, Weig A, et al. Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width. Ecol Evol. 2015;5(19):4327-44doi: 10.1002/ece3.1682.
Harter, D. E., Thiv, M., Weig, A., Jentsch, A., & Beierkuhnlein, C. (2015). Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width. Ecology and evolution, 5(19), 4327-44. https://doi.org/10.1002/ece3.1682
Harter, David E V, et al. "Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width." Ecology and evolution vol. 5,19 (2015): 4327-44. doi: https://doi.org/10.1002/ece3.1682
Harter DE, Thiv M, Weig A, Jentsch A, Beierkuhnlein C. Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width. Ecol Evol. 2015 Sep 14;5(19):4327-44. doi: 10.1002/ece3.1682. eCollection 2015 Oct. PMID: 26664682; PMCID: PMC4667834.
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Ecol Evol. 2015 Sep 14;5(19):4327-44. doi: 10.1002/ece3.1682. eCollection 2015 Oct.

Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width.

Ecology and evolution

David E V Harter, Mike Thiv, Alfons Weig, Anke Jentsch, Carl Beierkuhnlein

Affiliations

  1. Biogeography BayCEER University of Bayreuth Bayreuth Germany.
  2. State Museum of Natural History Stuttgart Stuttgart Germany.
  3. DNA Analytics and Ecoinformatics BayCEER University of Bayreuth Bayreuth Germany.
  4. Disturbance Ecology BayCEER University of Bayreuth Bayreuth Germany.

PMID: 26664682 PMCID: PMC4667834 DOI: 10.1002/ece3.1682

Abstract

The Crassulacean genus Aeonium is a well-known example for plant species radiation on oceanic archipelagos. However, while allopatric speciation among islands is documented for this genus, the role of intra-island speciation due to population divergence by topographical isolation or ecological heterogeneity has not yet been addressed. The aim of this study was to investigate intraspecific genetic structures and to identify spatial and ecological drivers of genetic population differentiation on the island scale. We analyzed inter simple sequence repeat variation within two island-endemic Aeonium species of La Palma: one widespread generalist that covers a large variety of different habitat types (Ae. davidbramwellii) and one narrow ecological specialist (Ae. nobile), in order to assess evolutionary potentials on this island. Gene pool differentiation and genetic diversity patterns were associated with major landscape structures in both species, with phylogeographic implications. However, overall levels of genetic differentiation were low. For the generalist species, outlier loci detection and loci-environment correlation approaches indicated moderate signatures of divergent selection pressures linked to temperature and precipitation variables, while the specialist species missed such patterns. Our data point to incipient differentiation among populations, emphasizing that ecological heterogeneity and topographical structuring within the small scales of an island can foster evolutionary processes. Very likely, such processes have contributed to the radiation of Aeonium on the Canary Islands. There is also support for different evolutionary mechanisms between generalist and specialist species.

Keywords: Gene flow barriers; island biogeography; isolation by distance; isolation by ecology; landscape genetics; niche width

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