Naslov
Northern Adriatic mesocosm experiment Rovinj 2003: dynamics of transparent organic microparticles

Autori
Radić, Tomislav ; Fuks, Dragica ; Radić, Jadranka ; Lyons, Daniel M.

Izvornik
Periodicum biologorum (0031-5362) 106 (2004), 1; 57-65

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

Ključne riječi
TEP; CSP; DYP; DBP; mesocosm; phytoplankton bloom

Sažetak
The mechanism of massive mucilage formation in the northern Adriatic is still unresolved. As an important component of organic matter cycling in the sea, transparent exopolymer particles (TEP) are known to have an important role in aggregation processes. To gain greater insight into the organic matter cycling, especially role of TEP and other transparent organic particles in the aggregation in this area, a mesocosm experiment was carried out where seawater was subjected to two nutrient regimes and particles dynamics were followed. Three specific stains were used for microparticle visualizing: Alciane blue for acidic polysaccharides, Coomassie brilliant blue for proteinaceous organic matter and DAPI for DNA abd RNA-like matter. An additional colorimetric protocol was used for the measuring the staining capacity of TEP. The abundance of TEP, CSP and DAPI stained particles were of the same order of magnitude, but with different dynamics patterns. All parameters showed no statistical significant difference between results of the three replicates in one treatment, or between two treatments. TEP were significantlly correlated with phytoplankton biomass, with maxima observed 2-3 days after the phytoplankton maximum. a diatom species Dactyliosolen fragilissimus is shown to be capable of producing large amounts organic matter suitable for TEP formation. Following phytoplankton maxima, larger TEP prevailed. Microscopic and colorimetric measurements of TEP showed different, but complementary results. CSP were also confirmed to be influenced by phytopšlankton blooms. DAPI stained particles were not influenced by processes of highphytoplankton excretion.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA