Distribution of marine lipid classes in salty Rogoznica Lake (Croatia)

Penezić, Abra; Gašparović, Blaženka; Burić, Zrinka; Frka, Sanja (2010) Distribution of marine lipid classes in salty Rogoznica Lake (Croatia). Estuarine, Coastal and Shelf Science, 86 (4). pp. 625-636. ISSN 0272-7714

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Abstract

Lipid classes in a small, eutrophicated salty lake (Rogoznica Lake, middle Adriatic), which is often subject to appeareance of anoxic conditions, were analyzed at the end of winter (March) and in summer (July) 2008. The results are supported with DOC, POC, phytoplankton, temperature, salinity and oxygen data. During both March and July massive diatom blooms were recorded with maximum values at 5 m depth. Total lipids were found at high concentrations that were similar for the samplings in two months. Total particulate lipids dominated the pool, and showed large variations from 46.37-369.88 ug/l, with the highest concentration observed in the bottom anoxic layer in March. The variations for dissolved lipids were smaller and ranged from 44.82 to 124.35 ug/l. Opposite to lipids, DOC values increased 1.5 times between the two samplings, from the value of average 0.95 mg C/l in March to the average value of 1.44 mg/l in July. Conformingly with diatom blooms, POC was found in July at high concentrations (0.28-1.50 mg C/l), contributing to total organic carbon up to 46%. The distribution of organic carbon and lipids showed the tendency of accumulation toward deeper layers. The characterization of individual lipid classes revealed the dominance of phospholipids, indicating that the lipids in the lake mainly originated from the photosynthetically active phytoplankton community, which is sustained by high production of oxygen (oxygen saturation up to 200%). Low contribution of neutral lipids in the particulate fraction points to high availability of nutrients for present phytoplankton community. Lipid breakdown indices were found at significantly higher concentrations in March compared to July. Sea surface microlayer, the hydrophobic boundary, appeared to be generally lipid depleted in comparison to the subsurface water. Qualitative analysis of sulfolipids revealed the potential of the lake for the occurrence of chemical interaction of sulfur with present organic matter.

Item Type:	Article
Uncontrolled Keywords:	lipids; phytoplankton; sea surface microlayer; oxygen; organic matter; salty lake; Croatia; Adriatic; Rogoznica Lake
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Interdisciplinary Natural Sciences NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Nature of organic matter, interaction with traces and surfaces in environment (Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišu)- Irena Ciglenečki-Jušić 098-0982934-2717 MZOS Structure and development of microalgal communities in a trophic gradient (Struktura i razvoj zajednica mikroalga u trofičkom gradijentu)- Damir Viličić 119-1191189-1228 MZOS
Depositing User:	Abra Penezić
Date Deposited:	03 Nov 2015 12:13
URI:	http://fulir.irb.hr/id/eprint/2208
DOI:	10.1016/j.ecss.2009.11.030

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