Studies on dinoflagellates in the northern Baltic Sea
Dinoflagellates are an important part of the Baltic Sea phytoplankton community. The group includes significant primary producers, consumers, bloom-forming species, toxic species, and species capable of rapid expansion to new areas. The aim of this thesis is to provide new information on the occurre...
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Helsingin yliopisto
2013
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/38315 2023-08-20T04:04:56+02:00 Studies on dinoflagellates in the northern Baltic Sea Hällfors, Heidi Edler, Lars University of Helsinki, Faculty of Biological and Environmental Sciences, Department of Environmental Sciences Finnish Environment Institute, Tvärminne Zoological Station Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta, ympäristötieteiden laitos Helsingfors universitet, bio- och miljövetenskapliga fakulteten, miljövetenskapliga institutionen Kuosa, Harri 2013-02-22T11:46:28Z application/pdf http://hdl.handle.net/10138/38315 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-67851-2-7 Helsinki: Unigrafia oy, 2013, Walter and Andrée de Nottbeck Foundation Scientific Reports. 0358-6758 http://hdl.handle.net/10138/38315 URN:ISBN:978-952-10-8628-1 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. hydrobiologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2013 ftunivhelsihelda 2023-07-28T06:13:28Z Dinoflagellates are an important part of the Baltic Sea phytoplankton community. The group includes significant primary producers, consumers, bloom-forming species, toxic species, and species capable of rapid expansion to new areas. The aim of this thesis is to provide new information on the occurrence of dinoflagellates in the northern Baltic proper and the western Gulf of Finland by investigating 1) trends in temporal and spatial distribution of dinoflagellates, 2) patterns of co-occurring taxa in the dinoflagellate community, and 3) external factors that explain dinoflagellate occurrence. These issues were investigated in four studies, on which this thesis is based. In the first study, we compared the phytoplankton communities of the early 1900s and the present, and examined the role of dinoflagellates in the species compositions of these two periods. In the second study, the focal point was moved forward in time to the annual and interannual dynamics and diversity of the present-day dinoflagellate community, and in the third study further to a more detailed level, the description of a new taxon, Heterocapsa arctica subsp. frigida, and its ecology and distribution. Lastly, in the fourth study we shifted focus from seasonal, interannual and geographical occurrence to smaller-scale occurrence, i.e. the vertical distribution of dinoflagellates in the water column, as represented by a case study on Dinophysis acuminata and D. norvegica. A total of 47 dinoflagellate species, 28 genera, and four higher-level taxa were observed. Of the species-level taxa, 15 have not been previously reported from the northern Baltic proper and/or the Gulf of Finland. We also contributed to the knowledge of Baltic Sea dinoflagellate diversity by formally describing the new taxon, Heterocapsa arctica subsp. frigida, which furthermore represents a for phytoplankton unusual taxonomical level, i.e. a subspecies. The conspecificity of H. arctica subsp. frigida with H. arctica subsp. arctica, described from the Canadian Arctic, was ... Doctoral or Postdoctoral Thesis Arctic Phytoplankton Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
hydrobiologia |
spellingShingle |
hydrobiologia Hällfors, Heidi Studies on dinoflagellates in the northern Baltic Sea |
topic_facet |
hydrobiologia |
description |
Dinoflagellates are an important part of the Baltic Sea phytoplankton community. The group includes significant primary producers, consumers, bloom-forming species, toxic species, and species capable of rapid expansion to new areas. The aim of this thesis is to provide new information on the occurrence of dinoflagellates in the northern Baltic proper and the western Gulf of Finland by investigating 1) trends in temporal and spatial distribution of dinoflagellates, 2) patterns of co-occurring taxa in the dinoflagellate community, and 3) external factors that explain dinoflagellate occurrence. These issues were investigated in four studies, on which this thesis is based. In the first study, we compared the phytoplankton communities of the early 1900s and the present, and examined the role of dinoflagellates in the species compositions of these two periods. In the second study, the focal point was moved forward in time to the annual and interannual dynamics and diversity of the present-day dinoflagellate community, and in the third study further to a more detailed level, the description of a new taxon, Heterocapsa arctica subsp. frigida, and its ecology and distribution. Lastly, in the fourth study we shifted focus from seasonal, interannual and geographical occurrence to smaller-scale occurrence, i.e. the vertical distribution of dinoflagellates in the water column, as represented by a case study on Dinophysis acuminata and D. norvegica. A total of 47 dinoflagellate species, 28 genera, and four higher-level taxa were observed. Of the species-level taxa, 15 have not been previously reported from the northern Baltic proper and/or the Gulf of Finland. We also contributed to the knowledge of Baltic Sea dinoflagellate diversity by formally describing the new taxon, Heterocapsa arctica subsp. frigida, which furthermore represents a for phytoplankton unusual taxonomical level, i.e. a subspecies. The conspecificity of H. arctica subsp. frigida with H. arctica subsp. arctica, described from the Canadian Arctic, was ... |
author2 |
Edler, Lars University of Helsinki, Faculty of Biological and Environmental Sciences, Department of Environmental Sciences Finnish Environment Institute, Tvärminne Zoological Station Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta, ympäristötieteiden laitos Helsingfors universitet, bio- och miljövetenskapliga fakulteten, miljövetenskapliga institutionen Kuosa, Harri |
format |
Doctoral or Postdoctoral Thesis |
author |
Hällfors, Heidi |
author_facet |
Hällfors, Heidi |
author_sort |
Hällfors, Heidi |
title |
Studies on dinoflagellates in the northern Baltic Sea |
title_short |
Studies on dinoflagellates in the northern Baltic Sea |
title_full |
Studies on dinoflagellates in the northern Baltic Sea |
title_fullStr |
Studies on dinoflagellates in the northern Baltic Sea |
title_full_unstemmed |
Studies on dinoflagellates in the northern Baltic Sea |
title_sort |
studies on dinoflagellates in the northern baltic sea |
publisher |
Helsingin yliopisto |
publishDate |
2013 |
url |
http://hdl.handle.net/10138/38315 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Phytoplankton |
genre_facet |
Arctic Phytoplankton |
op_relation |
URN:ISBN:978-952-67851-2-7 Helsinki: Unigrafia oy, 2013, Walter and Andrée de Nottbeck Foundation Scientific Reports. 0358-6758 http://hdl.handle.net/10138/38315 URN:ISBN:978-952-10-8628-1 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774715352565940224 |