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Light and nutrient effects on microbial communities collected during spring and summer in the Beaufort Sea

2008; Inter-Research Science Center; Volume: 54; Linguagem: Inglês

10.3354/ame01268

1616-1564

Marta Estrada, Maddalena Bayer‐Giraldi, Jordi Felipe, Cèlia Marrasé, M. Montserrat Sala, Montserrat Vidal,

Marine Biology and Ecology Research

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 54:217-231 (2009) - DOI: https://doi.org/10.3354/ame01268 Light and nutrient effects on microbial communities collected during spring and summer in the Beaufort Sea M. Estrada1,*, M. Bayer-Giraldi1,3, J. Felipe1, C. Marrasé1, M. M. Sala1, M. Vidal2 1Institut de Ciències del Mar, CSIC, Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain 2Departament d’Ecologia, Universitat de Barcelona, Avgda. Diagonal 645, 08028 Barcelona, Spain 3Present address: Alfred-Wegener-Institute for Polar and Marine Research, Postfach 120161, 27515 Bremerhaven, Germany *Email: marta@icm.csic.es ABSTRACT: Between autumn 2003 and summer 2004, the icebreaker CCGS ‘Amundsen’ occupied a station in Franklin Bay, Beaufort Sea. Two microcosm experiments were carried out in spring, while the water column was covered by sea ice, to test whether phytoplankton assemblages sampled from ice-covered (spring) surface waters would be able to bloom when exposed to increased light and to what extent this bloom would be limited by light or nutrients. Two additional experiments were carried out during a sea-ice free period in summer. For the spring experiments (April 2004), surface water collected through an ice hole was distributed into 10 l Nalgene bottles and subjected to different photosynthetically available radiation (PAR; 5 to 60 µmol photons m–2 s–1) and nutrient addition treatments. A similar setup was repeated in July and August 2004. In the spring experiments, chlorophyll a (chl a) concentration showed an initial decline, probably reflecting a combination of autotrophic cell losses and photoacclimation effects. After about 2 wk, chl a started to increase exponentially at PAR above 10 µmol photons m–2 s–1, due to the proliferation of autotrophic nanoflagellates. In summer, chl a increased immediately after enclosure, mainly due to diatom (Thalassiosira/Porosira) growth. In spring, nutrient addition had no effect on the net rate of chl a accumulation, while phytoplankton increased faster and reached higher biomass in the nutrient-amended bottles in summer. The relationships between nutrient consumption and production of chl a and particulate organic matter in our experiments suggested an important utilization of dissolved organic nutrients. KEY WORDS: Phytoplankton · Protists · Nutrients · Stoichiometry · Light response · Sea ice · Beaufort Sea · Arctic Full text in pdf format NextCite this article as: Estrada M, Bayer-Giraldi M, Felipe J, Marrasé C, Sala MM, Vidal M (2009) Light and nutrient effects on microbial communities collected during spring and summer in the Beaufort Sea. Aquat Microb Ecol 54:217-231. https://doi.org/10.3354/ame01268 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 54, No. 3. Online publication date: February 24, 2009 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2009 Inter-Research.