Global warming and oligotrophication lead to increased lipid production in marine phytoplankton

Novak, Tihana; Godrijan, Jelena; Pfannkuchen, Daniela Marić; Đakovac, Tamara; Medić, Nikola; Ivančić, Ingrid; Mlakar, Marina; Gašparović, Blaženka (2019) Global warming and oligotrophication lead to increased lipid production in marine phytoplankton. Science of the Total Environment, 668 . pp. 171-183. ISSN 0048-9697

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Abstract

Earth temperature is rising and oligotrophication is becoming apparent even in coastal seas. In this changing environment, phytoplankton use carbon and nutrients to form important biomolecules, including lipids. However, the link between lipid production and changing environment is still unexplored. Therefore, we investigated the phytoplankton lipid production in the diatom Chaetoceros pseudocurvisetus cultures under controlled temperatures ranging from 10 to 30 °C and nutrient regimes mimicking oligotrophic and eutrophic conditions. Results were compared to plankton community's lipid production in the northern Adriatic at two stations considered as oligotrophic and mesotrophic during an annual monthly sampling. In order to gain detailed information on the investigated system, we supplemented lipid data with chlorophyll a concentrations, phytoplankton taxonomy, cell abundances and nutrient concentration along with hydrographic parameters. We found enhanced particulate lipid production at higher temperatures, and substantially higher lipid production in oligotrophic conditions. Enhanced lipid production has two opposing roles in carbon sequestration ; it can act as a retainer or a sinker. Lipid remodeling, including change in ratio of phospholipids and glycolipids, is more affected by the nutrient status, than the temperature increase. Triacylglycerol accumulation was observed under the nitrogen starvation.

Item Type:	Article
Additional Information:	We would like to thank Dr. Robert Precali for Chl a data. Jasna Jakovcevic and Margareta Buterer are greatly acknowledged for sample collection and analyses of nutrients and Chl a. We thank Ivan Grabar for C. pseudocurvisetus cultures' nutrient analysis. We thank the crew of the R/V Vila Velebita for their professional help and support. We also thank Brittney Honisch and Dr. Catherine Mitchell for their help with English language edits. This work was funded by the grants from the Croatian Science Foundation under the projects IP-11-2013-8607 Appearance and interaction of biologically important organic molecules and micronutrient metals in marine ecosystem under environmental stress and Life strategies of phytoplankton in the northern Adriatic UIP-2014-09-6563.
Uncontrolled Keywords:	Marine lipids ; Temperature ; Nutrients ; Northern Adriatic Sea ; Chaetoceros pseudocurvisetus ; Diatoms
Subjects:	NATURAL SCIENCES > Interdisciplinary Natural Sciences NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Životne strategije fitoplanktona u sjevernom Jadranu-P-limit Andreas Pfannkuchen Martin UIP-2014-09-6563 HRZZ Utjecaj okolišnog stresa na pojavnost i međudjelovanje biološki važnih organskih molekula i mikronutrijenata u morskom ekosustavu-AMBIOMERES Blaženka Gašparović IP-2013-11-8607 HRZZ
Depositing User:	Blaženka Gašparović
Date Deposited:	01 Jul 2019 14:12
URI:	http://fulir.irb.hr/id/eprint/4603
DOI:	10.1016/j.scitotenv.2019.02.372

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