Multiple Source Pools and Dispersal Barriers for Galápagos Plant Species Distribution

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dc.contributor.authorYeakley, J. Alan
dc.contributor.authorWeishampel, John F.
dc.date.accessioned2018-03-13T19:02:36Z
dc.date.available2018-03-13T19:02:36Z
dc.date.issued2000
dc.description.abstractWe reexamined geographic factors explaining the number of plant species on islands in the Galápagos Archipelago. We hypothesized that plant species richness (S) was related to the number of source pools and that plant species dispersal preferentially followed direct, oceanic pathways. To test different dispersal pathways from multiple source pools, the total number of islands within a given dispersal radius (i) was posed as the sum of the number of line-of-sight islands (Cᵢ) and of the number of islands without line-of-sight connection (Bᵢ). In partial regression analyses, controlling for nearest island area (A₂) and for recipient island elevation (E) and area (lnA), Cᵢ and Cᵢ × E were found to be positively correlated with S in the Galápagos for nearly all dispersal ranges from 10 km to 419 km (maximum inter-island separation). In contrast, Bᵢ × E was negatively correlated with S at the longest dispersal ranges. The connectivity index, Cᵢ, multiplied by elevation, E, explained more variation in S in the Galápagos than prior regression models using additive forms of E, lnA, A₂, and isolation from the central island. Using the variables Cᵢ × E and lnA, multiple-regression models explained >90% of the variance in both endemic and total plant species richness in the Galápagos Archipelago.en_US
dc.format.extent7 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/M29P2W77C
dc.identifier.citationJ. Alan Yeakley and John F. Weishampel 2000. Multiple Source Pools and Dispersal Barriers for Galápagos Plant Species Distribution. Ecology 81:893–898.en_US
dc.identifier.urihttp://hdl.handle.net/11603/7861
dc.language.isoen_USen_US
dc.publisherWileyen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Geography and Environmental Systems Department Collection
dc.rightsThis item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
dc.subjectGalapagos Islandsen_US
dc.subjectPlant diversityen_US
dc.subjectPhytogeographyen_US
dc.subjectplantsen_US
dc.subjectconnectivityen_US
dc.subjectendemic speciesen_US
dc.subjecttopographical elevationen_US
dc.subjectislandsen_US
dc.subjectspeciesen_US
dc.subjectextinct speciesen_US
dc.subjectmarine ecologyen_US
dc.titleMultiple Source Pools and Dispersal Barriers for Galápagos Plant Species Distributionen_US
dc.typeTexten_US

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