Historical biogeography of the Gondwanan freshwater genus Boeckella (Crustacea): timing and modes of speciation in the Southern Hemisphere
Author
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Maturana, Claudia S.
Author
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Rosenfeld, Sebastián
Author
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Biersma, Elisabeth M.
Author
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Segovia, Nicolás
Author
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González Wevar, Claudio A.
Author
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Díaz, Angie
Author
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Naretto, Javier
Author
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Duggan, Ian C.
Author
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Hogg, Ian D.
Author
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Poulin, Elie Albert
Author
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Convey, Peter
Author
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Jackson, Jennifer A.
Admission date
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2021-12-22T16:37:56Z
Available date
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2021-12-22T16:37:56Z
Publication date
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2021
Cita de ítem
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Diversity and Distributions 2021;27:2330–2343
es_ES
Identifier
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10.1111/ddi.13405
Identifier
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https://repositorio.uchile.cl/handle/2250/183364
Abstract
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Aim We investigated evolutionary relationships and biogeographical patterns within the genus Boeckella to evaluate (1) whether its current widespread distribution in the Southern Hemisphere is due to recent long-distance dispersal or long-term diversification; and (2) the age and origin of sub-Antarctic and Antarctic Boeckella species, with particular focus on the most widely distributed species: Boeckella poppei. Location South America, sub-Antarctic islands, maritime Antarctica, continental Antarctica and Australasia. Methods To reconstruct phylogenetic patterns of Boeckella, we used molecular sequence data collected from 12 regions and applied Bayesian and Maximum Likelihood analyses using multiple loci. We also estimated divergence times and reconstructed ancestral ranges using two different models of species evolution. Results Phylogenetic analyses and divergence time estimates suggested that Boeckella originated on the Gondwanan supercontinent and initially split into two main clades during the late Cretaceous (ca. 80 Ma). The first clade diversified in Australasia, and the second clade is currently distributed in South America, various sub-Antarctic islands and Antarctica. Dispersal from South America to the Kerguelen and Crozet archipelagos occurred during the Eocene/Oligocene (B. vallentini) and in the late Pliocene (B. brevicaudata), while South Georgia and the maritime Antarctic were likely colonized during the late Pleistocene (B. poppei). Main conclusions Boeckella has a Gondwanan origin, with further diversifications after the physical separation of the continental landmasses. Extant populations of Boeckella from the Scotia Arc islands and Antarctic Peninsula originated from South America during the Pleistocene, suggesting that original Antarctic Gondwanan lineages did not survive repeated glacial cycles during the Quaternary ice ages. A continuous decline in the species accumulation rate is apparent within the genus as the early Eocene, suggesting that Boeckella diversification may have decreased due to progressive cooling throughout the Cenozoic era.
es_ES
Patrocinador
dc.description.sponsorship
British Antarctic Survey
Comision Nacional de Investigacion Cientifica y Tecnologica NE/P003079/1
21140632
21150317
PIA APOYO CCTE AFB170008
PIA CONICYT ACT172065
Universidad de Magallanes PR-06-CRN-18
Carlsberg Foundation CF18-0267
Institut chilien de l'Antarctique DG_03-16
DT_04-16
es_ES
Lenguage
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en
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Publisher
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Wiley
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Type of license
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Attribution-NonCommercial-NoDerivs 3.0 United States