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Lusitanian/Mediterranean ostracods in the Holocene of Denmark: implications for the interpretation of winter temperatures during the postglacial temperature maximumDepartment of Earth Sciences, University of Aarhus, DK 8000 Århus C, Denmark
Department of Earth Sciences, University of Aarhus, DK 8000 Århus C, Denmark Two species of Lusitanian/Mediterranean ostracods, Aurila arborescens and Callistocythere badia, are reported from middle Holocene (Atlantic chronozone) localities in northern Jutland, Denmark. The two species occur in gyttja-rich, sandy deposits in association with shallow-water euryhaline mollusc and ostracod faunas. They are found in sediments from the Atlantic chronozone dated between 6790 ± 75 BP and 5900 ± 110 BP. A. arborescens is essentially a Mediterranean species with only two documented live occurrences outside the Mediterranean. It lives in shallow water with coldest-month temperatures of at least 6°C and warmest-month temperatures of at least 15-16°C. C. badia occurs in littoral marine environments in the eastern Mediterranean and along the southern and western coasts of the British Isles. It is suggested that coldest-month sea-surface temperatures in northern Denmark between 6800 BP and 5900 BP were more than 5-6°C above present values. The temperature maximum of the Atlantic chronozone in southern Scandinavia was apparently strongly influenced by westerly winds that brought into the North Sea area warm Atlantic air- and watermasses of the type presently found southwest of the British Isles.
Key Words: Ostracoda • Holocene • Recent • sea-surface temperature • climatic change • Mediterranean species • winter temperatures • Denmark.
The Holocene, Vol. 6, No. 4,
423-432 (1996) |
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