Distribution of cryptophytes along trophic gradients in the Adriatic Sea. (CROSBI ID 508013)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Viličić, Damir ; Ivančić, Ingrid ; Carić, Marina ; Ahel, Marijan ; Terzić, Senka
engleski
Distribution of cryptophytes along trophic gradients in the Adriatic Sea.
Among marine and brackish nanoplankton Cryptophytes are common, unicellular, flagellated protists. Cells are easily recognizable under the light microscope (much better by phase contrast than by fluorescent microscope), due to their stiff proteinaceous periplast. We try to define distribution of cryptophytes along two trophic gradients. The first one is in the northern Adriatic (Istrian profile), where the river Po and northwesterly inflowing, oligotrophic current influences could be traced. The second profile is along the Velebit Channel and Zrmanja Estuary. Abundant cryptophytes were found in brackish and marine environments ; thus cryptophyte distribution was weakly correlated with salinity. Cryptophyte abundances provided positive correlation with alloxanthin concentrations. Maximum cryptophyte abundances in the N Adriatic and in the Zrmanja Estuary appear in late spring and summer, together with dinoflagellates. These two components appear in the environment enriched with dissolved organic matter produced by the spring diatom blooms. Most phytoplankton are able to use organic substances for growth (mixotrophy). Cryptophytes can phagotrophicaly graze bacteria. In addition cells can obtain organic substances directly from the solution through the process of osmotrophy. On the other hand, cryptophytes are important prey organisms for ciliates. Ingestion of cryptophytes by dinoflagellates was also detected in the environment of limited phosphorus. In the Adriatic, the abundance of cryptophytes was positively and significantly correlated with abundance of dinoflagellates, indicating their metabolic mutualism. This is an important ecological aspect in the coexistance of many of species in the oligotrophic environment. We investigated the interrelationship between cryptophyte bundance/biomass, abiotic and biotic factors. The case study along the Istrian profile in July 2004 is presented.
cryptophytes; distribution; trophic; gradient; Adriatic Sea
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Podaci o prilogu
29-31.
2005.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of South-eastern Europe Programme Symposium "Ecosystem dynamics, marine chemistry, aquaculture and management in the Adriatic and north Norwegian coastal zone"
Wassmann, Paul ; Ćosović, Božena
Zagreb: Norwegian Research Council
Podaci o skupu
South-eastern Europe Programme Symposium Ecosystem dynamics, marine chemistry, aquaculture and management in the Adriatic and north Norwegian coastal zone
pozvano predavanje
27.04.2005-01.05.2005
Hvar, Hrvatska