50,000 years of ice and seals: Impacts of the Last Glacial Maximum on Antarctic fur seals
| Autor: | Christian Lydersen, Kit M. Kovacs, Alison C. Cleary, Andrew D. Lowther, Joseph I. Hoffman, Jaume Forcada |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Demographic history Range (biology) Population 010603 evolutionary biology 01 natural sciences 03 medical and health sciences single nucleotide polymorphisms Peninsula VDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470 14. Life underwater glacial refugia education Ecology Evolution Behavior and Systematics QH540-549.5 030304 developmental biology Nature and Landscape Conservation Original Research 0303 health sciences Panmixia education.field_of_study geography.geographical_feature_category biology Ecology Population size Arctocephalus gazella Last Glacial Maximum biology.organism_classification demographic history Geography Physical geography |
| Zdroj: | Ecology and Evolution, Vol 11, Iss 20, Pp 14003-14011 (2021) Ecology and Evolution |
| DOI: | 10.1002/ece3.8104 |
| Popis: | Ice is one of the most important drivers of population dynamics in polar organisms, influencing the locations, sizes, and connectivity of populations. Antarctic fur seals, Arctocephalus gazella, are particularly interesting in this regard, as they are concomitantly reliant on both ice‐associated prey and ice‐free coastal breeding areas. We reconstructed the history of this species through the Last Glacial Maximum (LGM) using genomic sequence data from seals across their range. Population size trends and divergence events were investigated using continuous‐time size estimation analysis and divergence time estimation models. The combined results indicated that a panmictic population present prior to the LGM split into two small refugial populations during peak ice extent. Following ice decline, the western refugial population founded colonies at the South Shetlands, South Georgia, and Bouvetøya, while the eastern refugial population founded the colony on Iles Kerguelen. Postglacial population divergence times closely match geological estimates of when these coastal breeding areas became ice free. Given the predictions regarding continued future warming in polar oceans, these responses of Antarctic fur seals to past climate variation suggest it may be worthwhile giving conservation consideration to potential future breeding locations, such as areas further south along the Antarctic Peninsula, in addition to present colony areas. We reconstructed the history of Antarctic fur seals through the Last Glacial Maximum (LGM) using genomic sequence data from seals across their range. Our results indicated that during the LGM, the global population was reduced to two small refugial populations, and that these populations then expanded shortly after the ice retreat to found the present‐day colonies. |
| Databáze: | OpenAIRE |
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