Recent Trends Towards Oligotrophication of the Northern Adriatic: Evidence from Chlorophyll <Emphasis Type="Italic">a</Emphasis> Time Series |
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| Authors: | Patricija Mozeti? Cosimo Solidoro Gianpiero Cossarini Giorgio Socal Robert Precali Janja Francé Franco Bianchi Cinzia De Vittor Nenad Smodlaka Serena Fonda Umani |
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| Institution: | (1) Marine Biology Station, National Institute of Biology, Fornace 41, 6330 Piran, Slovenia;(2) The National Institute of Oceanography and Experimental Geophysics, Borgo Grotta Gigante 42/c, 34010 Sgonico, TS, Italy;(3) ISMAR CNR, Castello 1364/A, 30122 Venice, Italy;(4) Center for Marine Research, Ruđer Bošković Institute, G. Paliage 5, 52210 Rovinj, Croatia;(5) Department of Life Sciences, University of Trieste, v. Valerio 28/A, 34143 Trieste, Italy |
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| Abstract: | The results of the updated and quality-checked data base of field observations on chlorophyll a (Chl a) collected in the period 1970–2007 in the Northern Adriatic Sea are presented. From the last decade, SeaWiFS satellite information
was also considered. Results demonstrate a global tendency towards Chl a reduction in the period of investigation, which is more marked in the eutrophic area under the influence of the Po River.
In the rest of the basin, which presents meso- or oligotrophic characteristics, long-term changes are more difficult to detect.
The long-term field dataset can be divided into two periods: the last decade characterized by the strong decrease observed
in the whole northern Adriatic and the earlier period with no or slight increase. The recent substantial reduction of Chl
a concentrations is confirmed all over the basin (−0.11 mg m−3 year−1) from satellite-derived information. Results are consistent with recently evidenced decrease in concentrations of phosphate
and ammonia and point to the existence of oligotrophication in the Northern Adriatic. Results indicate forcefully that the
still common perception of the Adriatic Sea as a very eutrophic basin is no longer appropriate, at least for its northern
part and in recent years. |
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