Naslov
Environmental conditions and phytoplankton in a stratified estuary of the Ombla river. Spring and summer

Autori
Carić, Marina ; Jasprica, Nenad

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Third International Balkan Botanical Congress "Plant Resources the Creation of New Values" : Book of Abstracts / Redžić, Sulejman ; Đug, Samir - Sarajevo : Prirodno-matematički fakultet Univerziteta u Sarajevu, 2003

Skup
International Balkan Botanical Congress "Plant Resources the Creation of New Values" (3 ; 2003)

Mjesto i datum
Sarajevo, Bosna i Hercegovina, 18.05.2003. - 24.05.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
hydrography; nutrients; phytoplankton; Ombla river estuary; southern Adriatic

Sažetak
The spring of the Ombla River is located on the Adriatic coast near Dubrovnik. The spring discharges at sea level, forming the Ombla River, and almost immediately flows into the sea to form a small, 4-km long, highly stratified estuary. The Ombla River discharge varied from 6.8-49.1 m3 s-1 during spring - summer period. A sharp halocline, frequently at 2-4 m depths, delimited the low salinity surface and saline bottom layers. The first, greater, peak of MICRO cell numbers and Chl a concentrations, including a NANO peak occurred during end-May, a time when temperatures in both layers reached their high rising value (22.45º ; C), and when nutrient concentrations in the surface layer were high. The MICRO population in both layers was mostly composed of dinoflagellates (>89%), mainly the species Prorocentrum triestinum (max. 1.3 x 105 cells l-1). The contribution of dinoflagellates was mostly greater in the surface than in the bottom layers. A second, lower, MICRO peak and a greater NANO peak appeared at end-August, coinciding with the annual minimum of freshwater runoff and with the stabilization of thermohaline conditions. In this layer, most of the MICRO population (>85%) was made up of the dinoflagellates Scrippsiella trochoidea and Prorocentrum triestinum, and the euglenophyte Eutreptia lanowii. In the bottom layer, the species Oxytoxum sceptrum, Dinophysis acuminata and Ceratium pentagonum were found alongside the species Prorocentrum triestinum. According to our results, the intensive development of phytoplankton in May and August was strongly related on temperature and elevated nutrient concentrations.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA