Enhanced dissolved lipid production as a response to the sea surface warming

Novak, Tihana; Godrijan, Jelena; Marić Pfannkuchen, Daniela; Djakovac, Tamara; Mlakar, Marina; Baričević, Ana; Smodlaka Tanković, Mirta; Gašparović, Blaženka (2018) Enhanced dissolved lipid production as a response to the sea surface warming. Journal of Marine Systems, 180 . pp. 289-298. ISSN 0924-7963

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Abstract

The temperature increase in oceans reflects on marine ecosystem functioning and surely has consequences on the marine carbon cycle and carbon sequestration. In this study, we examined dissolved lipid, lipid classes and dissolved organic carbon (DOC) production in the northern Adriatic Sea, isolated diatom Chaetoceros pseudocurvisetus batch cultures grown in a wide temperature range (10-30 °C) and in contrasting nutrient regimes, phosphorus (P)-depleted and P-replete conditions. Additionally, lipids and DOC were analysed in the northern Adriatic (NA) in two stations characterized with different P availability, occupied from February to August 2010 that covered a temperature range from 9.3 to 31.1 °C. To gain insight into factors governing lipid and lipid classes’ production in the NA, apart from temperature (T), chlorophyll a, phytoplankton community abundance and structure, nutrient concentrations were measured together with hydrographic parameters. We found enhanced accumulation of dissolved lipids, particulary glycolipids, with increasing T, especially during the highest in situ temperature. The effect of T on enhanced dissolved lipid release is much more pronounced under P-deplete conditions indicating that oligotrophic regions might be more vulnerable to T rise. Temperature between 25 and 30C is a threshold T range for C. pseudocurvisetus, at which a significant part of lipid production is directed towards the dissolved phase. Unlike monocultures, there are multiple factors influencing produced lipid composition, distribution and cycling in the NA that may counteract the T influence. The possible role of enhanced dissolved lipid concentration for carbon sequestration at elevated T is discussed. On the one hand, lipids are buoyant and do not sink, which enhances their retention at the surface layer. In addition, they are surface active, and therefore prone to adsorb on sinking particles, contributing to the C sequestration.

Item Type:	Article
Uncontrolled Keywords:	Dissolved lipids ; DOC ; Diatom Chaetoceros pseudocurvisetus ; Northern Adriatic Sea ; global warming
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:	21 May 2018 10:12
URI:	http://fulir.irb.hr/id/eprint/4039
DOI:	10.1016/j.jmarsys.2018.01.006

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