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Influence of salinity, temperature, dissolved inorganic carbon and nutrient concentration on the photosynthesis and growth of Fucus vesiculosus from the Baltic and Irish Seas
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2008 (English)In: European journal of phycology, ISSN 0967-0262, Vol. 43, no 3, 253-262 p.Article in journal (Refereed) Published
Abstract [en]

Fucus vesiculosus from the northern Baltic Sea (5 psu) and from the Irish Sea (35 psu) were cultivated at different temperatures, salinities and dissolved inorganic carbon (DIC) concentrations with the addition of different nutrient concentrations. The influence of these abiotic factors was assessed by measuring photosynthesis as electron transport rate (ETR) and growth as relative growth rate (RGR). The maximal ETR and the RGR of the Irish Sea plants in their natural seawater (50.8 mol electrons m(-2) s-1; 0.024 g g(-1) day(-1)) were significantly higher than those of the Baltic plants in their natural seawater (21.9 mol electrons m-2 s(-1); 0.007 g g(-1) day(-1)). When Baltic F. vesiculosus was cultivated at a DIC concentration similar to that of the Irish Sea, the ETR as well as RGR increased, but never equalled the rates of the marine F. vesiculosus from the Irish Sea. Cultivation at different salinities showed that F. vesiculosus from the Baltic has a higher ETRmax and RGR at low salinities (5-10 psu) than F. vesiculosus from the Irish Sea, whose ETR and RGR decreased sharply in salinities below 20 psu. Plants from both sites grown at high nutrient concentrations, however, performed better at low salinities than those grown under low nutrient conditions. Salinity had the greatest impact on differences in ETR and RGR between the two populations, followed by differences in DIC and nutrient concentrations. There was a highly significant correlation between ETRmax and RGR in plants from both sites and across the full range of culture conditions, indicating that the same amount of energy from photosynthesis is used for growth in both varieties of the species at different salinities. The photosynthesis of F. vesiculosus in the northern Baltic is close to the minimum demand for growth, which may account for their small size. The temperature optimum for F. vesiculosus from the Baltic was 4-10 degrees C, while that for F. vesiculosus from the Irish Sea was 15-20 degrees C. The photosynthesis of Irish Sea plants was less strongly affected by exposure to high irradiances than that of plants from the Baltic.

Place, publisher, year, edition, pages
2008. Vol. 43, no 3, 253-262 p.
Keyword [en]
BROWN-ALGAE; PAM FLUOROMETRY; WATER; PHAEOPHYCEAE; FUCALES; ECOPHYSIOLOGY; LAMINARIALES; CHLOROPHYTA; ADAPTATION; MACROALGAE
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:miun:diva-7239DOI: 10.1080/09670260802172627ISI: 000259086000002Scopus ID: 2-s2.0-50249137212OAI: oai:DiVA.org:miun-7239DiVA: diva2:127091
Note

VR-Biology

Available from: 2008-11-30 Created: 2008-11-30 Last updated: 2013-01-10Bibliographically approved
In thesis
1. Ecophysiological responses of Baltic and Atlantic Fucus vesiculosus to environmental factors
Open this publication in new window or tab >>Ecophysiological responses of Baltic and Atlantic Fucus vesiculosus to environmental factors
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Baltic Sea is a species-poor ecosystem where marine species coexist with freshwater species. The Baltic Sea offers low salinity, low content of inorganic carbon, long cold winters and no tides.One of the few marine species that can be found in the Baltic, is the brown alga Fucus vesiculosus, which is regarded as ecologically the most important alga in this area. The aim of the present thesis was to examine physiological (photosynthesis and growth) differences between F. vesiculosus in the Bothnian Sea (northern Baltic) and the Atlantic. Measurements were performed with plants in their natural seawaters and under changed conditions of salinity, temperature, nutrients and inorganic carbon concentrations.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2005. 44 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 6
Keyword
acclimation, Atlantic, Baltic Sea, Bothnian Sea, Cd, Fucus vesiculosus, growth, high PAR, Pb, photosynthesis, salinity, stress, UV-B
National Category
Biological Sciences
Identifiers
urn:nbn:se:miun:diva-5880 (URN)4405 (Local ID)91-85317-15-2 (ISBN)4405 (Archive number)4405 (OAI)
Public defence
2005-12-09, M108, Åkroken, Sundsvall, 10:00 (English)
Supervisors
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2009-07-13Bibliographically approved

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