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

Title data

Harter, David ; Thiv, Mike ; Weig, Alfons ; Jentsch, Anke ; Beierkuhnlein, Carl:
Spatial and ecological population genetic structures within two island-endemic Aeonium species of different niche width.
In: Ecology and Evolution. Vol. 5 (2015) Issue 19 . - pp. 4327-4344.
ISSN 2045-7758
DOI: https://doi.org/10.1002/ece3.1682

Project information

Project title:
Project's official titleProject's id
Open Access PublizierenNo information
Deutsche ForschungsgemeinschaftBE 2192/11-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER131266
Keywords: Aeonium; ISSR
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography > Chair Biogeography - Univ.-Prof. Dr. Carl Beierkuhnlein
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Disturbance Ecology > Professorship Disturbance Ecology - Univ.-Prof. Dr. Anke Jentsch
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Disturbance Ecology
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 570 Life sciences, biology
Date Deposited: 24 Sep 2015 06:09
Last Modified: 13 Feb 2017 12:11
URI: https://eref.uni-bayreuth.de/id/eprint/19544