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Using chemostats to investigate the temperature-dependence of phytoplankton metabolic rates under nutrient-limited growth

AuthorsPérez-Lorenzo, María ; Cermeño, Pedro ; Chouciño, Paloma; Mouriño-Carballido, Beatriz; Sobrino, Cristina; Marañón, Emilio
Issue Date25-Feb-2015
PublisherAssociation for the Sciences of Limnology and Oceanography
Citation2015 Aquatic Sciences Meeting. Program Book: 119 (2015)
AbstractThe metabolic rates of all organisms tend to increase exponentially with temperature within the thermal tolerance range. The temperature-dependence of phytoplankton growth is well-established (e.g. Eppley’s curve), but has typically been determined under resource-saturated conditions, whereas nutrient limitation is common in the ocean. A recent analysis (PLoS One 9(6) e99312) showed that the large-scale variability of phytoplankton biomass-specific carbon fixation rate in the ocean is mainly controlled by resource supply, being apparently independent from temperature. This finding suggests that nutrient limitation could reduce the temperature-dependence of phytoplankton metabolism. To test this hypothesis, we maintained the diatom Skeletonema costatum under nitrate-limited, steady-state growth in continuous culture systems and measured carbon fixation rates at different temperatures and dilution rates. Our results indicate that nutrient limitation does result in a significant reduction in the temperature-dependence of phytoplankton metabolic rates, with potentially important consequences for understanding the impacts of sea surface warming on microbial plankton communities and marine ecosystems
DescriptionAquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada, Spain
Publisher version (URL)http://www.sgmeet.com/aslo/granada2015/program.asp
Appears in Collections:(IIM) Comunicaciones congresos
(ICM) Comunicaciones congresos
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