RT info:eu-repo/semantics/article
T1 Transferring and implementing the general dynamic model of oceanic island biogeography at the scale of island fragments: the roles of geological age and topography in plant diversification in the Canaries
A1 Otto, Rüdiger
A1 Whittaker, Robert J.
A1 Gaisberg, Markus von
A1 Stierstorfer, Christian
A1 Naranjo-Cigala, Agustín
A1 Steinbauer, Manuel J.
A1 Borregaard, Michael K.
A1 Arévalo, José Ramón
A1 Garzón Machado, Víctor
A1 Arco Aguilar, Marcelino José del
A1 Fernández-Palacios, José María
K1 Canary islands
K1 Endemic plants
K1 Environmental heterogeneity
K1 General dynamic model
K1 Island biogeography
K1 Island evolution
K1 Landscape diversity
K1 Oceanic islands
K1 Spatial autocorrelation
K1 Species richness patterns
AB Aim The general dynamic model (GDM) of oceanic island biogeography integratesrates of immigration, speciation and extinction in relation to a humpedtrajectory of island area, species carrying capacity and topographic complexitythrough time, based on a simplified island ontogeny. In practice, many islandshave more complex ontogenies, featuring surfaces of varying age. Here, weextend the GDM to apply at a local scale within islands, and test the predictionsanalytically within individual islands.Location El Hierro, La Palma and Tenerife (Canary Islands).Methods Following the GDM logic, we derive predictions for the distributionsand richness of single island endemics (SIEs) across island landscapes ofdifferent age. We test these predictions by means of generalized linear modelsand binominal tests using gridded species occurrence data for vascular plantSIE species and a set of climatic, topographic and terrain age variables. We alsoexamined phylogenetic divergence times for a subset of endemic lineages.Results Geological age, in interaction with slope, and topographic variables,best explained SIE richness at the landscape scale. About 70% of SIEs hadranges strongly biased to, or largely restricted to old terrain. Available phylogeneticdivergence times of SIEs of radiated plant lineages suggested an origin onthe older parts of the islands. Metrics of anthropogenic disturbance and habitatavailability were unrelated to the observed SIE pattern.Main conclusions Our findings support the hypothesis that SIEs haveevolved and accumulated on older and topographically complex terrain, whilecolonization processes predominate on the youngest parts. These results implythat evolutionary processes shape species distributions at the landscape scalewithin islands. This opens the perspective of extending the GDM framework tounderstand processes at a local scale within individual islands.
YR 2016
FD 2016
LK http://riull.ull.es/xmlui/handle/915/16997
UL http://riull.ull.es/xmlui/handle/915/16997
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 26-dic-2024