Palaeoenvironmental indications of a Late Weichselian ostracod assemblage from the southern Kattegat, Scandinavia
Titel:
Palaeoenvironmental indications of a Late Weichselian ostracod assemblage from the southern Kattegat, Scandinavia
Auteur:
Majoran, Stefan
Verschenen in:
GFF
Paginering:
Jaargang 121 (1999) nr. 3 pagina's 215-220
Jaar:
1999-09-01
Inhoud:
Vibrocore 9303 was drilled at a water depth of 35 m in the southern Kattegat and penetrated 10 m of Holocene and Late Weich-selian sediments. The ostracods recorded from 11 samples of this core in the time between c. 11,500 and 10,500 BP are dominated by Elofsonella concinna, Sarsicytheridea punctillata, Cytheropteron dimlingtonensis, Roundstonia globulifera, Acanthocythereis dunelmensis, Sarsicyther-idea bradii, Cytheropteron macchesneyi, Robertsonites tuberculatus, freshwater spp., and Heterocyprideis sorbyana. Most of these species are autochthonous (not freshwater spp.) based on their population age structures. The maximum bottom-water temperature probably ranged from 8 to 12 °C during summer. The palaeoenvironment was probably marine sublittoral with depths exceeding 10-15 m. The time interval between c. 10,900 and 10,650 BP is marked by (1) an increase in ostracod species diversity, (2) a decrease in dominance of the three most abundant ostracod species, (3) a replacement of A. dunelmensis by C. macchesneyi and (4) freshwater species become more abundant. These changes may possibly be due to an increased niche availability and/or sea-level changes associated with a stronger influence of freshwater to the in situ environment. However, the changes in species composition are statistically insignificant according to a bootstrap correspondence analysis.
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