Environmental changes during isolation processes from the Litorina Sea as reflected by diatoms and geochemical parameters -a case study
Bibliographic Data
| ID | 12265224 |
|---|---|
| Authors | Per Westman (Stockholm University, corresponding author), Anna Hedenström (Stockholm University) |
| Year | 2002 |
| Volume | 12 |
| Issue | 5 |
| Pages | 531-540 |
| Publication date | 2002-07-01 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | The Holocene (JOURNAL) |
| Journal identifiers | ISSN: 0959-6836 • E-ISSN: 1477-0911 |
| Publisher | SAGE Publishing (PUBLISHER • US) |
| DOI | 10.1191/0959683602hl560rp |
| OpenAlex | W2071080841 |
| Language | EN |
| Citations received | 5 |
| References cited | 30 |
The aim with the present case study was to detect environmental changes during the isolation of a lake from the Baltic Sea. Elemental and stable-isotope ratios of carbon and nitrogen are presented as well as results of a diatom analysis of a sedimentary sequence from Lake Skären in southeastern Sweden. The dated part of the analysed sequence covers the period c. 8200 to 7000 cal. years BP, i.e., the late Ancylus Lake to early Litorina Sea stages. It is concluded that subtle environmental changes due to ‘ uctuations in input of organic material from different sources cannot be detected by diatom analysis alone, but that chemostratigraphy is an important complement to diatom stratigraphy when interpreting the isolation process. We also conclude that, even though δ 13 C is highly variable in Baltic Sea sediment, it is most useful in isolation studies for recording the contribution of organic carbon derived from benthic macro-algae and/or terrestrial sources, as a proxy for shore displacement. It is especially valuable in combination with the C/N ratio, which seems to be the most unambiguous parameter. The δ 15 N data showed that cyanobacterial blooms in the coastal zone of the early Litorina Sea were probably less pronounced than in the offshore areas of the Baltic Sea. The abrupt increase of Chaetoceros spp. resting spores slightly prior to isolation is interpreted as caused by a eutrophication process during the isolation: it is probably also due to nitrogen deficiency due to denitrification in the coastal areas
Benthic zone · Biology · Carbon cycle · Chaetoceros · Diatom · Ecosystem · Eutrophication · Holocene · Nutrient · Phytoplankton · Total organic carbon · Environmental Science · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Marine and environmental studies · Ecology · Geology · Oceanography
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| Citations per year | 0.25 |
|---|---|
| Citation span | 2006 - 2011 (6) |
| Highly cited | No |