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Phytoplankton seminar and PhD defense 14.-15.3.2013 in Viikki PDF Print E-mail
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Tuesday, 12 March 2013 10:56
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Dear all,

It is my pleasure to welcome you to two Baltic Sea phytoplankton related events at the University of Helsinki in mid-March.

First, on Thursday March 14th at 13:15 - 17:00, welcome to a half-day phytoplankton seminar in Viikki, Viikinkaari 5, Biocentre 2, auditorium 1041. Talks on Baltic Sea phytoplankton, covering topics from long-term trends and distribution to ecology, will be given by my opponent Lars Edler, my pre-examiners Norbert Wasmund and Tore Lindholm, and my supervisor Harri Kuosa; please see attachment for details.

Second, on Friday March 15th, in the same auditorium at 12 noon, welcome to the public examination of my doctoral thesis titled "Studies on dinoflagellates in the northern Baltic Sea". The thesis is based on the following papers:

I. Hällfors, H., Backer, H., Leppänen, J.-M., Hällfors, S., Hällfors, G. & Kuosa, H.: The northern Baltic Sea phytoplankton communities in 1903–1911 and 1993–2005: a comparison of historical and modern species data. – Hydrobiologia, in press, DOI 10.1007/s10750-012-1414-4.

II. Hällfors, H., Hällfors, S., Kuosa, H. & Olsonen, R.: Seasonal and interannual occurrence of dinoflagellates in the northern Baltic proper and the western Gulf of Finland in 1993–2000. – Manuscript.

III. Rintala, J.-M., Hällfors, H., Hällfors, S., Hällfors, G., Majaneva, M. & Blomster, J. 2010: Heterocapsa arctica subsp. frigida subsp. nov. (Peridiniales, Dinophyceae) – description of a new dinoflagellate and its occurrence in the Baltic Sea. – Journal of Phycology 46(4):751–762.

IV. Hällfors, H., Hajdu, S., Kuosa, H. & Larsson, U. 2011: Vertical and temporal distribution of the dinoflagellates Dinophysis acuminata and D. norvegica in the Baltic Sea. – Boreal Environment Research 16(2):121–135.

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 my thesis was 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 the abovementioned four studies. 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.

Please feel free to distribute this information to interested parties.

All welcome!

Best regards,

Heidi Hällfors

University of Helsinki
Department of Environmental Sciences
P.O. Box 65
FI-00014 University of Helsinki

Street address:
Bio centre 3
Viikinkaari 1

phone +358 50 400 22 83

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