title: Archipelago colonization by ecologically dissimilar amphibians: evaluating the expectation of common evolutionary history of geographical diffusion in co-distributed rainforest tree frogs in islands of Southeast Asia.
abstract: Widespread, co-distributed species with limited relative dispersal abilities represent compelling focal taxa for comparative phylogeography. Forest vertebrates in island archipelagos often exhibit pronounced population structure resulting from limited dispersal abilities or capacity to overcome marine barriers to dispersal. The exceptionally diverse Old World tree frogs of the family Rhacophoridae have colonized the forested island archipelagos of Southeast Asia on multiple occasions, entering the islands of Indonesia and the Philippines via a "stepping stone" mode of dispersal along elongate island chains, separated by a series of marine channels. Here we evaluate the prediction that two tightly co-distributed Philippine rhacophorids colonized the archipelago during concomitant timescales and in the same, linear, "island-hopping" progression. We use a new multilocus dataset, utilize dense genetic sampling from the eastern arc of the Philippines, and we take a model-based phylogeographic approach to examining the two species for similar topological patterns of diversification, genetic structure, and timescales of diversification. Our results support some common mechanistic predictions (a general south-to-north polarity of colonization) but not others (timescale for colonization and manner and degree of lineage diversification), suggesting differing biogeographic scenarios of geographical diffusion through the archipelago and unique and idiosyncratic ecological capacities and evolutionary histories of each species.
authors.affiliation: Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045-7561, USA. Electronic address: paumichserg@hotmail.com.
authors.forename: Paulette
authors.initials: P
authors.lastname: Gonzalez
authors.affiliation: Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045-7561, USA; Department of Biological Science, Tunghai University, Taichung, Taiwan. Electronic address: ycsu@ku.edu.
authors.forename: Yong-Chao
authors.initials: YC
authors.lastname: Su
authors.affiliation: Sam Noble Museum and Department of Biology, University of Oklahoma, Norman, OK 73073-7029, USA. Electronic address: camsiler@ou.edu.
authors.forename: Cameron D
authors.initials: CD
authors.lastname: Siler
authors.affiliation: Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045-7561, USA. Electronic address: ajbarley@ku.edu.
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Barley
authors.affiliation: Father Saturnino Urios University, 8600 Butuan City, Philippines. Electronic address: mbsanguila@urios.edu.ph.
authors.forename: Marites B
authors.initials: MB
authors.lastname: Sanguila
authors.affiliation: Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045-7561, USA; Herpetology Section, Zoology Division, National Museum of the Philippines, Rizal Park, Padre Burgos Avenue, Manila, Philippines. Electronic address: arvin.diesmos@gmail.com.
authors.forename: Arvin C
authors.initials: AC
authors.lastname: Diesmos
authors.affiliation: Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045-7561, USA; Herpetology Section, Zoology Division, National Museum of the Philippines, Rizal Park, Padre Burgos Avenue, Manila, Philippines. Electronic address: rafe@ku.edu.
authors.forename: Rafe M
authors.initials: RM
authors.lastname: Brown
mesh_terms: D000818:Animals; D001001:Anura / Q000235:genetics*; D017753:Ecosystem; D010679:Philippines; D010802:Phylogeny; D058974:Phylogeography; D017422:Sequence Analysis, DNA
keywords: Frilled Tree Frog; Kurixalus appendiculatus; Mindanao tree frog; Old World tree frogs; Philippines; Rhacophorus bimaculatus