| 1. |
- Andrén, Thomas, et al.
(författare)
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New insights on the Yoldia Sea low stand in the Blekinge archipelago, southern Baltic Sea
- 2007
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Ingår i: GFF. - 1103-5897 .- 2000-0863. ; 129, s. 277-285
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Tidskriftsartikel (refereegranskat)abstract
- One sediment core from the Jarnavik bay in Blekinge archipelago has been investigated for its content of pollen and diatoms and its chemical properties. Two levels were also dated by radiocarbon. Based on the results the sediment sequence analysed has been divided into three environmental units largely corresponding to the lithology of the sequence. A lowermost unit consisting of weakly varved and homogeneous clay was deposited during the end of the brackish phase of the Yoldia Sea at a moderate water depth. On top of this unit a gyttja-clay unit was deposited. The onset of the deposition of this unit has been dated to c. 11 100 cal. yrs. BP. An increasing organic production and increased terrestrial influence is recorded in the chemical data and a very shallow water depth is indicated in the pollen and diatom flora. These results point to conditions in a bay probably isolated from the Yoldia Sea. A local tentative shore displacement curve have been constructed and it is proposed that this unit represents the low stand at c. -18 m during the Yoldia Sea stage in this part of the Baltic Sea basin. The uppermost unit consists of homogeneous clay with a low content of organic carbon. An increasing water depth is indicated by the composition of both pollen and diatoms. The diatom flora also displays an increase in freshwater species. This environmental change was probably the result of a transgression in the beginning of the Ancylus Lake stage.
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| 2. |
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| 3. |
- Yu, Shiyong, et al.
(författare)
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Mid-Holocene Baltic Sea transgression along the coast of Blekinge, SE Sweden ancient lagoons correlated with beach ridges
- 2004
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Ingår i: GFF. - 2000-0863 .- 1103-5897. ; 126:3, s. 257-272
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Tidskriftsartikel (refereegranskat)abstract
- The mid-Holocene Littorina transgression in southern Scandinavia is well documented. Multiple-stratigraphic sequences in ancient Littorina lagoons in the coastal area of Blekinge, SE Sweden reveal a maximum relative sea level of 7-8 m above present sea level between 8000-6000 cal. BP. Evidence for at least two transgression waves is found within this period. In this study these are documented in one modern lake and correlated with an ancient beach-lagoon stratigraphy. Furthermore, two younger transgressions are documented at one site, altogether establishing a firm transgression chronology for the time span 8000-4000 cal. BP (sea level 5-8 m a.s.l.) as a basis for understanding the dynamics of Baltic sea-level changes. Neolithic cultural layers are correlated to regression periods, indicating more favorable conditions for beach settlement between stormy transgression periods.
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| 4. |
- Yu, Shi-Yong, et al.
(författare)
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Holocene palaeoecology and shoreline displacement on the Biskopsmåla Peninsula, southeastern Sweden
- 2003
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Ingår i: Boreas. - : Wiley. - 0300-9483 .- 1502-3885. ; 32, s. 578-589
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Tidskriftsartikel (refereegranskat)abstract
- High-resolution palaeoecological proxies of pollen, macrofossils and diatoms from an isolation lake provide a long-term record of the Holocene landscape history and shoreline displacement on the Biskopsmala Peninsula in central Blekinge, SE Sweden. During the Preboreal/Boreal transition, the peninsula was sparsely vegetated by woodlands, along with lateglacial dwarf shrub/steppe communities. The lake basin was isolated from the shallow Yoldia Sea during this time. The regional climate improved from 10 700 cal. BP, evident as progressive expansion of Pinus -dominated mixed forest with deciduous trees. The lake basin was probably connected with the Ancylus Lake during the period 10 700-10 100 cal. BP. Subsequently the basin became isolated again, corresponding to the Early Littorina Sea phase. Replacement of freshwater diatoms by those with brackish-water affinity at 8100 cal. BP indicates the initial transgression of the Littorina Sea in this basin. But not until 7500 cal. BP were brackish conditions fully established. Peaks of brackish-marine diatoms and dinoflagellates during 7500-7000 cal. BP indicate increased saltwater inflow to the Baltic Sea in response to global meltwater pulse 3. However, interactive changes in seagrass and stonewort macrofossil concentrations suggest that three minor transgressions during 5900-5300, 5000-4700 and 4400-4000 cal. BP occurred locally, associated with centennial-scale variations in regional wind pattern or coastal storminess. By 3000 cal. BP, the lake basin was finally isolated from the Baltic, and thereafter the landscape on the peninsula became gradually more influenced by human activities.
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| 5. |
- Åkesson, Christine, et al.
(författare)
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From landscape description to quantification : A new generation of reconstructions provides new perspectives on Holocene regional landscapes of SE Sweden
- 2015
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Ingår i: The Holocene. - : SAGE Publications. - 0959-6836 .- 1477-0911. ; 25:1, s. 178-193
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Forskningsöversikt (refereegranskat)abstract
- The development since the beginning of the 20th century of the pollen-analytical theory and method as a palaeoecological tool for describing landscape development is outlined with reference to southern Scandinavia. Numerical methods applied since the 1980s are discussed. The aim of this paper is to provide a new perspective on the landscape development and human impact during the Holocene by applying the Regional Estimates of VEgetation Abundance from Large Sites (REVEALS) model to the pollen records from the reference site Lake Farskesjon in SE Sweden. The model was applied both to a previously published record (core 1956, entire Holocene until ad 1600) and a newly collected dataset (core 2013, the last 3000years). The comparison between the REVEALS estimates of vegetation cover and historical landscape maps indicate that traditional, uncorrected pollen percentages significantly underestimate the degree of landscape openness created by long-term farming and pasturing, but that the degree of underestimation varies over time, depending on the species composition of both the forest and the open-land communities. The REVEALS reconstructions are also a useful tool for the quantification of past land-use changes that may have affected the nutrient loading to the Baltic Sea.
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| 6. |
- Battarbee, Richard W., et al.
(författare)
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John Birks: Pioneer in quantitative palaeoecology
- 2015
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Ingår i: The Holocene. - : SAGE Publications. - 0959-6836 .- 1477-0911. ; 25:1, s. 3-16
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Forskningsöversikt (refereegranskat)abstract
- We describe the career of John Birks as a pioneering scientist who has, over a career spanning five decades, transformed palaeoecology from a largely descriptive to a rigorous quantitative science relevant to contemporary questions in ecology and environmental change. We review his influence on students and colleagues not only at Cambridge and Bergen Universities, his places of primary employment, but also on individuals and research groups in Europe and North America. We also introduce the collection of papers that we have assembled in his honour. The papers are written by his former students and close colleagues and span many of the areas of palaeoecology to which John himself has made major contributions. These include the relationship between ecology and palaeoecology, late-glacial and Holocene palaeoecology, ecological succession, climate change and vegetation history, the role of palaeoecological techniques in reconstructing and understanding the impact of human activity on terrestrial and freshwater ecosystems and numerical analysis of multivariate palaeoecological data.
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| 7. |
- Berglund, Björn, et al.
(författare)
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Early Holocene history of the Baltic Sea, as reflected in coastal sediments in Blekinge, southeastern Sweden
- 2005
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Ingår i: Quaternary International. - : Elsevier BV. - 1873-4553 .- 1040-6182. ; 130:1, s. 111-139
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Tidskriftsartikel (refereegranskat)abstract
- Integrated palaeoecological studies of two fiord sediment sequences in the province of Blekinge, SE Sweden, covering the time span 11,000-5000 cal BP, reveal the timing and the environment for the Ancylus Lake/Littorina Sea transition 9800-8500 cal BP. The first ingression of saline water into the Baltic Sea through the Danish Straits occurred earlier than formerly assumed. New evidence, particularly mineral magnetic and palaeobotanical analyses, demonstrate that on the general trend of the eustatically caused Littorina transgression several minor fluctuations of the water level can be identified between 8500 and 5000 cal years BP. A distinct regression phase around 8 100 cal BP is correlated with the Greenland ice-core cold event dated to 8200 ice-core years BP. This is described as a regional climatic catastrophe for the Baltic Sea region. The coastal stratigraphy is compared with the offshore stratigraphy earlier studied. A tentative shore displacement curve for Early and Middle Holocene is presented.
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| 8. |
- Berglund, Björn
(författare)
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How Humans Have Shaped European Nature
- 2011
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Ingår i: Nature and Culture. - : Berghahn Books. - 1558-5468 .- 1558-6073. ; 6:1, s. 97-99
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Forskningsöversikt (refereegranskat)abstract
- Urban Emanuelsson. The Rural Landscapes of Europe: How Man has Shaped European Nature. Stockholm, Sweden: The Swedish Research Council Formas, 2009, www.formas.se.
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| 9. |
- Berglund, Björn
(författare)
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How mankind has shaped European nature
- 2011
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Ingår i: Vegetation History and Archaeobotany. - : Springer Science and Business Media LLC. - 0939-6314 .- 1617-6278. ; 20:1, s. 79-81
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Tidskriftsartikel (refereegranskat)abstract
- A monographic book volume on the history of the rural landscape of Europe is presented (Emanuelsson, The rural landscape of Europe. How man has shaped European nature, 383, 2009). The focus is on various land-use phases, their history from the Neolithic period to modern time and the survival of traditional farming today in Europe. This is described and illustrated by examples from marginal farming areas, particularly in mountainous regions of southern and northern Europe. Some of these are important as modern analogues when interpreting past cultural landscapes.
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| 10. |
- Berglund, Björn
(författare)
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Human impact and climate changes - synchronous events and a causal link?
- 2003
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Ingår i: Quaternary International. - 1873-4553. ; 105:1, s. 7-12
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Tidskriftsartikel (refereegranskat)abstract
- Interaction between cultural development and the natural environment is generally accepted. Holocene climate change is described as one of the main environmental factors behind a step-wise development of the cultural landscape in Northwest Europe. Seven periods of human impact changes-5900, 5500, 4500, 3800, 3000-2800, 1500 and 1100 cal. BP-are defined and compared with reconstructed climatic scenarios, based on insolation, glacier activity, lake and sea levels, bog growth, tree line, and tree growth. There is a positive correlation between human impact/land-use and climate change, although precise correlations are difficult because of weaknesses in the chronology. Future studies of annually laminated (varved) lake sediments and wiggle-matched radiocarbon sequences are emphasized, as well as a combination of palaeoecology and archaeology. It is hypothesized that agrarian society and the landscape developed step-wise, dependent on the interaction between the technological/social complex and the ecological capacity of a region, highly influenced by climate. (C) 2002 Elsevier Science Ltd and INQUA. All rights reserved.
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