Genetic signature of Last Glacial Maximum regional refugia in a circum-Antarctic sea spider

• Other Authors: AADC (originator), AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: biota; oceans; CHELICERATES; EARTH SCIENCE; BIOLOGICAL CLASSIFICATION; ANIMALS/INVERTEBRATES; ARTHROPODS; BIOLOGICAL RECORDS; CLIMATE INDICATORS; PALEOCLIMATE INDICATORS; POPULATION DYNAMICS; BIOSPHERE; ECOLOGICAL DYNAMICS; SPECIES/POPULATION INTERACTIONS; NYMPHON AUSTRALE; PYCNOGONIDS; SEA SPIDERS; DNA; GENETICS; FIELD INVESTIGATION; FIELD SURVEYS; AMD/AU; AMD; CEOS; GEOGRAPHIC REGION > POLAR; OCEAN > SOUTHERN OCEAN; SOUTHERN OCEAN > ROSS SEA; CONTINENT > ANTARCTICA; WEDDELL SEA; ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN > SOUTH SANDWICH ISLANDS; BOUVET ISLAND; Antarctic; Antarctic Peninsula; Bouvet; Bouvet Island; Ross Sea; Sandwich Islands; South Sandwich Islands; Southern Ocean; The Antarctic; Weddell; Weddell Sea; Antarc*; Antarctica; Australian Antarctic Program; South Atlantic Ocean
• Online Access: https://researchdata.ands.org.au/genetic-signature-glacial-sea-spider/987550; https://data.aad.gov.au/metadata/records/AAS_3010_Sea_Spiders_Genetics; https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_3010_Sea_Spiders_Genetics; https://data.aad.gov.au/eds/4533/download; https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_3010

See the publication for full details. Metadata record for data collected as part of Australian Antarctic Science project 3010 in the Australian Antarctic program. From the abstract of the referenced paper: 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.