Relationships between surface-active organic substances, chlorophyll a and nutrients in the northern Adriatic Sea

Gašparović, Blaženka; Đakovac, Tamara; Tepić, Nataša; Degobbis, Danilo (2011) Relationships between surface-active organic substances, chlorophyll a and nutrients in the northern Adriatic Sea. Continental Shelf Research, 31 (10). pp. 1149-1160. ISSN 0278-4343

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Abstract

Surface-active organic substances (SAS), nutrients, chlorophyll a (Chl a), dissolved oxygen (O2), salinity (S) and temperature (T) were measured approximately monthly in the northern Adriatic Sea (NA) during two years. Results were elaborated for two stations of different trophic status. Exhaustive statistical examinations of measured variables were performed to contribute to better understanding of the processes and interdependence of the measured parameters. The results of those analyses allowed the region to be described based on several groups of data relevant for particular processes. Chl a appear to be independent parameter ; orthosilicate, nitrite, and ammonium represent the parameter group most relevant for regeneration processes ; the second group includes nutrients dominant in freshwater inputs (orthophosphate and nitrate), while in the third group are parameters related to primary production processes (T, O2, organic phosphorus and SAS). Probably due to time lags between nutrient uptake and phytoplankton growth as well as between cells growth/division and SAS release, both, the correlation between nutrients and Chl a and the correlation between Chl a and SAS were not statistically significant. Although significantly higher nutrient and Chl a concentrations were found in the mesotrophic western part of the region in comparison to the oligotrophic eastern part, the SAS concentration differences were less marked. It is assumed that more OM is produced, but also at the same time remineralized, at the mesotrophic western part, leading to higher concentrations of regenerated nutrients there. Presence of different phytoplankton taxa and/or fractions (micro and nano) at the two stations may have also contributed to minimize the difference in SAS contents. Higher SAS acidities were noticed in the mesotrophic than in the oligotrophic part.

Item Type:	Article
Uncontrolled Keywords:	surface-active substances; nutrients; chlorophyll a; northern Adriatic Sea; multivariate statistical analysis
Subjects:	NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type 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 14:47
URI:	http://fulir.irb.hr/id/eprint/4047
DOI:	10.1016/j.csr.2011.04.010

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