Primary production, carbon release, and respiration during spring bloom in the Baltic Sea

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http://hdl.handle.net/10138/304633

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Spilling , K , Fuentes-Lema , A , Quemalinos , D , Klais , R & Sobrino , C 2019 , ' Primary production, carbon release, and respiration during spring bloom in the Baltic Sea ' , Limnology and Oceanography , vol. 64 , no. 4 , pp. 1779-1789 . https://doi.org/10.1002/lno.11150

Title: Primary production, carbon release, and respiration during spring bloom in the Baltic Sea
Author: Spilling, Kristian; Fuentes-Lema, Antonio; Quemalinos, Daniel; Klais, Riina; Sobrino, Cristina
Contributor: University of Helsinki, Tvärminne Zoological Station
Date: 2019-07
Language: eng
Number of pages: 11
Belongs to series: Limnology and Oceanography
ISSN: 0024-3590
URI: http://hdl.handle.net/10138/304633
Abstract: We determined the gross and net primary production (GPP and NPP) for the total community and the <10 mu m size fraction, the net release of dissolved organic carbon (DOC), and the microbial respiration in the Baltic Sea during the spring bloom. Samples (n = 126) were taken from the surface (3 m depth) covering most subbasins and different phases of the bloom, defined by the inorganic nutrient and Chlorophyll a (Chl a) concentrations. During the course of the bloom, the NPP rate (i.e., growth rate) decreased from 0.34 d(-1) +/- 0.03 (SE) to 0.15 d(-1) +/- 0.02 (SE), the contribution of the <10 mu m fraction increased from 14% +/- 2.5 (SE) to 47% +/- 4.0 (SE) and the percent extracellular release (PER) increased from 3.8% +/- 0.7 (SE) to 8.9% +/- 1.5 (SE). The assimilation number, was on average 0.13 mol C (g Chl a)(-1) h(-1) +/- 0.01 (SE), and the average GPP:NPP rate was 1.25. The respiration increased with growth rate and was 21% of the GPP rate. The net release of DOC was relatively constant over the bloom phases, with increasing PER compensating for the reduction in biomass, and estimated to 24-36 mu mol DOC L-1 during the whole spring bloom period in all subbasins except in the Bay of Bothnia where it was 75% lower. The assimilation number was surprisingly stable, suggesting it is uncoupled from the inorganic nutrient concentration, likely a reflection of physiological acclimation and changing phytoplankton community.
Subject: DISSOLVED ORGANIC-MATTER
DARK RESPIRATION
PHYTOPLANKTON
NET
PHOTOSYNTHESIS
GROWTH
GROSS
EXCRETION
EXPORT
GULF
1181 Ecology, evolutionary biology
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