The Origins and Diversification of the Exceptionally Rich Gemsnakes (Colubroidea: Lamprophiidae: Pseudoxyrhophiinae) in Madagascar.

Autor: Burbrink FT; Department of Herpetology, The American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA., Ruane S; Department of Biological Sciences, 206 Boyden Hall, Rutgers University-Newark, 195 University Ave, Newark, NJ 07102, USA., Kuhn A; Department of Herpetology, The American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA.; Department of Biology, The Graduate School and University Center, The City University of New York, 365 Fifth Ave., New York, NY 10016, USA., Rabibisoa N; Mention Sciences de la Vie et de l'Environnement, Faculté des Sciences, de Technologies et de l'Environnement, Université de Mahajanga, Campus Universitaire d'Ambondrona, BP 652, Mahajanga 401, Madagascar., Randriamahatantsoa B; Mention Sciences de la Vie et de l'Environnement, Faculté des Sciences, de Technologies et de l'Environnement, Université de Mahajanga, Campus Universitaire d'Ambondrona, BP 652, Mahajanga 401, Madagascar., Raselimanana AP; Mention: Zoologie et Biodiversité Animale, Faculté des Sciences, Université d'Antananarivo, BP 906, Antananarivo 101, Madagascar., Andrianarimalala MSM; Mention: Zoologie et Biodiversité Animale, Faculté des Sciences, Université d'Antananarivo, BP 906, Antananarivo 101, Madagascar., Cadle JE; Department of Biology, East Georgia State College, Swainsboro, GA 30401, USA., Lemmon AR; Department of Scientific Computing, Florida State University, Dirac Science Library, Tallahassee, FL 32306-4102, USA., Lemmon EM; Department of Biological Science, Florida State University, 319 Stadium Drive, Tallahassee, FL 32306-4295, USA., Nussbaum RA; Division of Reptiles and Amphibians, Museum of Zoology, Research Museums Center, 3600 Varsity Drive, University of Michigan, Ann Arbor, MI 48108, USA., Jones LN; Department of Biology, University of Washington, Seattle, WA 98195-1800, USA., Pearson R; Centre for Biodiversity & Environment Research, Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK., Raxworthy CJ; Department of Herpetology, The American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA.
Jazyk: angličtina
Zdroj: Systematic biology [Syst Biol] 2019 Nov 01; Vol. 68 (6), pp. 918-936.
DOI: 10.1093/sysbio/syz026
Abstrakt: Processes leading to spectacular diversity of both form and species on islands have been well-documented under island biogeography theory, where distance from source and island size are key factors determining immigration and extinction resistance. But far less understood are the processes governing in situ diversification on the world's mega islands, where large and isolated land masses produced morphologically distinct radiations from related taxa on continental regions. Madagascar has long been recognized as a natural laboratory due to its isolation, lack of influence from adjacent continents, and diversification of spectacular vertebrate radiations. However, only a handful of studies have examined rate shifts of in situ diversification for this island. Here, we examine rates of diversification in the Malagasy snakes of the family Pseudoxyrhophiinae (gemsnakes) to understand if rates of speciation were initially high, enhanced by diversification into distinct biomes, and associated with key dentition traits. Using a genomic sequence-capture data set for 366 samples, we determine that all previously described and newly discovered species are delimitable and therefore useful candidates for understanding diversification trajectories through time. Our analysis detected no shifts in diversification rate between clades or changes in biome or dentition type. Remarkably, we demonstrate that rates of diversification of the gemsnake radiation, which originated in Madagascar during the early Miocene, remained steady throughout the Neogene. However, we do detect a significant slowdown in diversification during the Pleistocene. We also comment on the apparent paradox where most living species originated in the Pleistocene, despite diversification rates being substantially higher during the earlier 15 myr.
(© The Author(s) 2019. Published by Oxford University Press, on behalf of the Society of Systematic Biologists. All rights reserved. For permissions, please email: journals.permissions@oup.com.)
Databáze: MEDLINE
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