Genetic signature of Last Glacial Maximum regional refugia in a circum-Antarctic sea spider
Soler Membrives, Anna (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Linse, Katrin (Natural Environmental Research Council, Cambridge)
Miller, Karen J. (Australian Institute of Marine Science)
Arango, Claudia P. (Queensland Museum)

Fecha:	2017
Resumen:	The evolutionary history of Antarctic organisms is becoming increasingly important to understand and manage population trajectories under rapid environmental change. The Antarctic sea spider Nymphon australe, with an apparently large population size compared with other sea spider species, is an ideal target to look for molecular signatures of past climatic events. We analysed mitochondrial DNA of specimens collected from the Antarctic continent and two Antarctic islands (AI) to infer past population processes and understand current genetic structure. Demographic history analyses suggest populations survived in refugia during the Last Glacial Maximum. The high genetic diversity found in the Antarctic Peninsula and East Antarctic (EA) seems related to multiple demographic contraction-expansion events associated with deep-sea refugia, while the low genetic diversity in the Weddell Sea points to a more recent expansion from a shelf refugium. We suggest the genetic structure of N. australe from AI reflects recent colonization from the continent. At a local level, EA populations reveal generally low genetic differentiation, geographically and bathymetrically, suggesting limited restrictions to dispersal. Results highlight regional differences in demographic histories and how these relate to the variation in intensity of glaciation-deglaciation events around Antarctica, critical for the study of local evolutionary processes. These are valuable data for understanding the remarkable success of Antarctic pycnogonids, and how environmental changes have shaped the evolution and diversification of Southern Ocean benthic biodiversity.
Nota:	Altres ajuts: This study was funded by the Australian Department of the Environment and Energy through the Australian Antarctic Division, Australian Antarctic Science grant no. AA3010 to C.P.A. The Census of Antarctic Marine Life (CAML) provided financial support for networking and access to collections (CAML coordination grant no. 34 to C.P.A).
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Nymphon australe ; Phylogeography ; Southern Ocean ; DNA barcoding ; Population structure
Publicado en:	Royal Society Open Science, Vol. 4 (october 2017) , ISSN 2054-5703

DOI: 10.1098/rsos.170615
PMID: 29134072

16 p, 1.3 MB

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