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Experimental induction of a coastal spring bloom early in the year by intermittent high-light episodes
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2012 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 446, 61-71 p.Article in journal (Refereed) Published
Abstract [en]

Through the use of mesocosm experiments, we show that an unusually early spring pbytoplankton bloom can be induced by intermittent high-light periods. We performed mesocosm experiments where plankton assemblages from Kiel Bight (Western Baltic Sea) received a light regime based on the natural seasonal irradiance dimmed to 43% of surface irradiance of cloudless days, starting with irradiance levels of mid-January (6 mesocosms) and mid-February (6 mesocosms). After 6 d, half of the mesocosms received a ca. 2-fold increase in irradiance. In the January mesocosms, a phytoplankton bloom developed only in the treatments with the high-light episode, whereas in the February mesocosms a phytoplankton bloom also developed in the controls. Phytoplankton net growth rates, production:biomass ratios and biomass at the end of the high irradiance episodes were positively correlated to the daily light dose. The relative biomass of diatoms increased with increasing light, whereas the relative biomass of cryptophytes decreased. A bottom-up transmission to mesozooplankton (mainly copepods of the genera Acartia and Oithona) was evident by increased densities of copepod nauplii and egg production under higher light conditions, whereas copepodids and adults showed no responses during the experimental period. The taxonomic composition of the nauplii was shifted to the advantage of Acartia/Centropages (not distinguished at the naupliar stage) under higher light conditions.

Place, publisher, year, edition, pages
Oldendorf Luhe: Inter-Research , 2012. Vol. 446, 61-71 p.
Keyword [en]
Plankton, Spring bloom, Irradiance
National Category
Oceanography, Hydrology, Water Resources Ecology
URN: urn:nbn:se:umu:diva-53948DOI: 10.3354/meps09486ISI: 000301323600005OAI: diva2:514846
Available from: 2012-04-11 Created: 2012-04-10 Last updated: 2012-04-11Bibliographically approved

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Lengfellner, Kathrin
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