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Dissertations / Theses on the topic 'Bothnian Sea'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Linder, Wiktorsson Emilia. "Eutrophication effects on a coastal macrophyte community in the Bothnian Sea." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184367.

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Eutrophication is a major concern in the Baltic Sea and it is affecting macrophyte communities by promoting the growth of opportunistic algae and decreasing the cover of perennial macrophyte species via shading. It is however uncertain how common eutrophication and its symptoms are in the northern parts of the Baltic Sea, the Botnian Sea. The aim of this study was to evaluate if Sörleviken, a bay in the Bothnian Sea, show signs of increased eutrophication pressure in 2020 compared to 2007 based on changes in macrophyte cover and composition. The macrophyte community was inventoried with under-

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2

Nordlöf, Ulrika. "Levels of organohalogen compounds in White-tailed sea eagles (Haliaeetus albicilla) in relation to reproduction impairment in the Bothnian Sea." Doctoral thesis, Stockholms universitet, Institutionen för tillämpad miljövetenskap (ITM), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-74634.

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The white-tailed sea eagle (Haliaeetus albicilla) is in the top of the marine food chain and its existence in Sweden has been threatened several times. The species succeeded to recover from the deep decline in the 1970s when the exposure to persistent organic pollutants influenced the reproduction negatively. The species is today spread over the country but is still seen as a near threatened species. Even though a recovery has occurred there is still some reproduction problems seen in the region of the south Bothnian Sea. The work presented in this thesis has focused on expanding the knowledge

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3

Wannäs, Kjell O. "Seismic stratigraphy and tectonic development of the Upper Proterozoic to Lower Palaozoic of the Bothnian Bay, Baltic Sea." Doctoral thesis, Stockholms universitet, Naturvetenskapliga fakulteten, 1989. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-81975.

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4

Carlén, Simon. "Identifying Sources and Ecological Risks of Polycyclic Aromatic Hydrocarbons in Polluted Fiber Enriched Sediments from the Bothnian Sea." Thesis, Umeå universitet, Kemiska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-165721.

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5

Vonk, Jorien Elisabeth. "Molecular and isotopic characterization of terrestrial organic carbon released to (sub-)Arctic coastal waters." Doctoral thesis, Stockholm : Department of Applied Environmental Science (ITM), Stockholm University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38589.

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Diss. (sammanfattning) Stockholm : Stockholms universitet, 2010.<br>At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Accepted. Paper 4: Manuscript. Härtill 4 uppsatser.

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6

Lindberg, Adrian. "Skeppssättning och Långröse : En komparativ studie längsmed Norrlands kustområde." Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414247.

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Through social landscape theory the aim of this thesis is to broaden the understanding of the bronze age monumental graves on the coast of Norrland. Questions about similarities between the stone ship settings and long cairns are analysed by looking at size and placement in the landscape. This shows the possible connections between the two construction types and were questioned throughout the process of writing. A reconstructed shoreline set to Late Nordic Bronze Age period IV, has been analysed by looking at the monuments placement to see possible connections through a maritory between Norrla

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7

Gylle, A. Maria. "Physiological adaptations in two ecotypes of Fucus vesiculosus and in Fucus radicans with focus on salinity." Doctoral thesis, Mittuniversitetet, Institutionen för naturvetenskap, teknik och matematik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-13308.

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The in origin intertidal marine brown alga Fucus vesiculosus L. grow permanently sublittoral in the brackish Bothnian Sea, side by side with the recently discovered F. radicans L. Bergström et L. Kautsky. Environmental conditions like salinity, light and temperature are clearly different between F. vesiculosus growth sites in the Bothnian Sea (4-5 practical salinity units, psu; part of the Baltic Sea) and the tidal Norwegian Sea (34-35 psu; part of the Atlantic Ocean). The general aims of this thesis were to compare physiological aspects between the marine ecotype and the brackish ecotype of F

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8

Matthews, P. A. "Crustal structure of the Baltic shield beneath the Sea of Bothnia; BABEL line 6." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5720/.

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As part of the 1989 BABEL project, Durham University recorded large quantities of high resolution wide-angle data from six deep seismic lines shot in the Gulf of Bothnia. Fifteen analogue and three digital seismic recording stations were used, located in Sweden around the Sea of Bothnia. The wide-angle data is of very high quality due to the low noise and good transmission of seismic energy through the cratonic crust of the Baltic Shield. BABEL line 6 is a 240 km long, north-south profile in the western half of the Sea of Bothnia that runs almost parallel to several deep seismic refraction pro

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9

Jiménez, Aguilera Helia Isabel. "Spatial variation of cyanobacteria in the Gulf of Bothnia." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-171698.

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As cyanobacteria can be found in a wide variety of environments and can cause great damage to ecosystems, human health, and economy, it is important to monitor and understand their behaviour. In this case, the study aims to understand the spatial variations of cyanobacteria communities in the Gulf of Bothnia, by analysing environmental factors that affect them. I hypothesize that the variations from north to south and coast to offshore of nutrients such as phosphorus and nitrogen promote the occurrence of different cyanobacteria orders, i.e. Chroococcales, Oscillatoriales, and Nostocales. The

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10

Graham, Daniel P. "A seismic study of the mid- and lower-crust beneath the sea of Bothnia : BABEL line 1." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5601/.

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In the Autumn of 1989, Durham University took part in the BABEL Project, a collaboration of scientists from five nations recording wide angle and normal incidence seismic data in the Baltic Shield. Recording stations were set up along the Swedish coast of the Sea of Bothnia to record marine airgun shots at wide angle. Similar stations were operated by Finnish teams on the eastern coast, and by a German team on Aland. The data recorded are of high quality and high resolution in comparison to previous wide angle surveys in the region, with a shot spacing of 75 m. A large proportion (around fifty

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11

Bárbulo, Diego. "Influence of sea ice seeding on the spring phytoplankton bloom : An experimental study in the Gulf of Bothnia." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-148586.

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The influence of sea ice seeding on the northern Baltic Sea´s pelagic phytoplankton spring bloom was studied in a laboratory experiment in which microcosms mimicked sea conditions. On March 26th, 2018, samples (ice cores and seawater) were taken from land-fast ice at a coastal station in the Gulf of Bothnia. The seeding experiment lasted for 9 days, during which a 12:12 hours light:dark incubation took place. Four different treatments (two with ice and two without it) were set up in twelve incubated microcosms. Samples for analyses were taken on days 0, 3, 6 and 9. On day 0, measurements were

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12

Busse, Svenja. "Benthic diatoms in the Gulf of Bothnia : Community analysis and diversity." Doctoral thesis, Uppsala University, Plant Ecology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2591.

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<p>Benthic diatoms are valuable tools for biological monitoring and paleo-ecological reconstruction of past environmental conditions. This thesis aims at describing size-related properties of benthic diatoms and suggests that data assessment for community analysis can be improved by considering the importance of scale. It investigates which environmental factors structure epilithic diatom communities on the coast of the Gulf of Bothnia and identifies environmental factors correlated with phytobenthic biomass. It also contributes to the floristic knowledge of the Baltic Sea. </p><p>Diatom speci

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13

Siira, A. (Antti). "Mixed-stock exploitation of Atlantic salmon (Salmo salar L.) and seal-induced damage in the coastal trap-net fishery of the Gulf of Bothnia:challenges and potential solutions." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514285639.

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Abstract The aims of this thesis included identifying ways to mitigate the economic losses of the commercial fishery in the Gulf of Bothnia resulting from fishery regulation enforced to protect wild Atlantic salmon stocks, the recent decline in survival of hatchery-reared salmon, and the dramatically increased seal-induced catch and gear damage. In addition, these solutions should facilitate safeguarding the recently-recovered wild salmon stocks and seal populations. Other goals included adding to and updating basic knowledge on the effects of increased seal populations, migrating salmon stock

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14

Lindgren, Simon. "Seal Predation Costs on the Vendace Fishery in the Bothnian Bay : A partial bioeconomic analysis of the economic costs inflicted upon the vendace fishery by seal predation." Thesis, Umeå universitet, Nationalekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-161096.

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This study examines the costs in terms of lost revenues inflicted upon the vendace fishing industry by increased seal predation in the Bothnian Bay between the years of 2008 and 2017. A partial bioeconomic model is used to estimate the costs of predation, where a constant stock management type is assumed. The results show that the average predation cost is approximately 4500 SEK per ringed seal and 2300 SEK per grey seal. A 10 percent increase in the ringed seal population is estimated to result in 7,1 million SEK in lost revenues on average, which would constitute 15 percent of the total aver

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15

Bergström, Lena. "Macroalgae in the Baltic Sea : responses to low salinity and nutrient enrichment in Ceramium and Fucus." Doctoral thesis, Umeå University, Ecology and Environmental Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-441.

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<p>The brackish Baltic Sea is a marginal environment for both marine and freshwater species. The rate of ecological differentiation is presumably high due to strong selection pressure from a gradient of decreasing salinity that has been present in its current state for only about 3 000 years. Even more recently, increased nutrient loading due to human activities has affected the growth rate of species, with potential effects on their competitive interactions and responses to other regulating factors. I have investigated the potential effects of low salinity and nutrient enrichment on the distr

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