Organic matter production during late summer-winter period in a temperate sea

Marić, Daniela; Frka, Sanja; Godrijan, Jelena; Tomažić, Igor; Penezić, Abra; Djakovac, Tamara; Vojvodić, Vjeročka; Precali, Robert; Gašparović, Blaženka (2013) Organic matter production during late summer-winter period in a temperate sea. Continental Shelf Research, 55 . pp. 52-65. ISSN 0278-4343

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Abstract

The quantity and quality of fresh organic matter (OM) formed by primary production in relation to phytoplankton community structure was calculated for the late summer–winter 2009/2010 in the northern Adriatic Sea (Mediterranean). Phytoplankton species, as a direct measure of fresh OM, Chlorophyll a, the OM pool (DOC and POC) and lipids, including classes, were analyzed. Data for temperature, salinity and nutrients enabled deeper insight into the conditions that promoted fresh OM production and associated processes at two stations of different trophic status. Phytoplankton growth was controlled by bottom regenerated nutrients and to lesser extent by riverine nutrients. The phytoplankton community was mainly dominated by nanoplankton. Species of moderate carbon content Chaetoceros compressus, Asterionellopsis glacialis, Leptocylindrus danicus and Bacteriastrum jadranum dominated the microplankton fraction. Availability of orthophosphates was the key factor influencing fresh OM production. POC varied from 37-522 g l-1. Freshphyto POC, i.e. carbon fixed in phytoplankton cells, contributed 7–79% to the POC pool. The DOC (890-1560 g l-1) level decreased during the investigated period. Calculation of fresh DOC, i.e. carbon fixed during primary production and released as dissolved OM, revealed it as a minor part (0-2%) of the DOC pool. Lipid concentrations varied from 9.9-55.0 g l-1 and 20.0-40.2 g l-1 in the particulate and dissolved fractions, respectively. Nutrient limitation caused increased synthesis of lipids, among which energy reserve lipids triacylglycerols, which are further immobilized for the construction of glycolipids with increasing depletion of orthophosphates.

Item Type:	Article
Uncontrolled Keywords:	organic matter; lipids; phytoplankton; nutrients; northern Adriatic Sea
Subjects:	NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Matematičko modeliranje cirkulacije i satelitska detekcija graničnih procesa- Milivoj Kuzmić 098-0982705-2707 MZOS Mehanizam dugoročnih promjena u ekosustavu sjevernog Jadrana- Robert Precali 098-0982705-2731 MZOS Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišu- Irena Ciglenečki-Jušić 098-0982934-2717 MZOS
Depositing User:	Blaženka Gašparović
Date Deposited:	21 May 2018 14:43
URI:	http://fulir.irb.hr/id/eprint/4045
DOI:	10.1016/j.csr.2013.01.008

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