Naslov
The role of water mass dynamics in controlling bacterial abundance and production in the middle Adriatic Sea

Autori
Šolić, Mladen ; Krstulović, Nada ; Vilibić, Ivica ; Kušpilić, Grozdan ; Šestanović, Stefanija ; Šantić, Danijela ; Ordulj, Marin

Izvornik
Marine Environmental Research (0141-1136) 65 (2008), 5; 388-404

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
data sampling; bacteria; heterotrophic nanoflagellates; water masses; multivariate analysis; Adriatic Sea

Sažetak
Month-to-month fluctuations in the abundance of bacteria and heterotrophic nanoflagellates (HNF) and bacterial production, as well as various chemical (nutrients, oxygen) and physical salinity, temperature) parameters were analysed at a station located in the open middle Adriatic Sea during one decade (1997– 2006). Being influenced by both coastal waters and open Adriatic circulation in the surface layer, and by the deep Adriatic water masses in the deep layers (100 m), this station is quite suitable for detecting the environmental changes occurring in the open Adriatic Sea with respect to the circulation of its water masses and their long-term changes and anomalies. Multivariate methods were used to identify seasonal and inter-annual changes of the investigated parameters, associating observed changes to the changes in Adriatic water masses and circulation regimes. The analyses showed that bacterial abundance and production were controlled by different water mass dynamics during 1997– 2001 compared to 2002– 2006 period, particularly noticeable in different seasonal patterns of biological parameters. The interplay between North Adriatic Dense Water (NAdDW) and Levantine Intermediate Water (LIW) resulted in a change in available nutrients (NAdDW is poor in orthophosphates), and as a consequence different bacterial abundance and production. A few periods were examined in detail, such as 2004, when LIW inflow was particularly strong and was accompanied by an increase of bacterial and HNF abundances, as well as of bacterial production.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Biologija

POVEZANOST RADA