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Foraminiferal fauna from a deep basin in Gullmar Fjord: The influence of seasonal hypoxia and North Atlantic Oscillation

Artikel i vetenskaplig tidskrift
Författare Irina Polovodova Asteman
Kjell Nordberg
Publicerad i Journal of Sea Research
Volym 79
Sidor 40-49
ISSN 1385-1101
Publiceringsår 2013
Publicerad vid Institutionen för geovetenskaper
Sidor 40-49
Språk en
Länkar dx.doi.org/10.1016/j.seares.2013.02...
Ämnesord Benthic foraminifera, Oxygen deficiency, Climate variations, Skagerrak-Kattegat fauna, Cassidulina, swedish west-coast, stained benthic foraminifera, oxygen concentrations, koljo-fjord, havstens-fjord, long-term, sea, sweden, climate, ocean
Ämneskategorier Marin ekologi

Sammanfattning

Historical benthic foraminiferal assemblages were analysed in two sediment cores recovered from the deepest basin of Gullmar Fjord by a Gemini and a gravity corer. A compilation of faunal data corresponding to the period 1935–2011 is presented together with the bottom water temperature, salinity and dissolved oxygen records for the same period. This study adds new information for the last decade (2001–2011) and investigates foraminiferal fauna after a prolonged period of positive North Atlantic Oscillation (NAO) and seasonal hypoxia (1979/80–1999). The earliest part of the record (ca. 1935–1998) reveals faunal changes similar to those reported in previous studies. The typical Skagerrak–Kattegat (S–K) faunas, which were present until ca. 1980–83, were replaced by Stainforthia fusiformis, often reported from environments with coastal hypoxia. A close relationship was noted between bottom water renewals, dominating weather regime (the NAO index) and geostrophic winds. After 1998, the NAO changed towards less extreme values, which facilitated regular bottom-water exchange events and the re-appearance of some S–K species: Cassidulina laevigata, Textularia earlandi and Bulimina marginata. However, the most recent severe hypoxic event (around 2008) again triggered the increase of low-oxygen tolerant species and interrupted the short re-establishment process of the S–K fauna.

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