Naslov
Taxonomy and spatial distribution of coccolithophors in the south Adriatic: winter aspect

Autori
Vugrin, Mirta ; Mejdandžić, Maja ; Bosak, Sunčica ; Mihanović, Hrvoje ; Dupčić-Radić, Iris ; Godrijan, Jelena ; Orlić, Sandi ; Ljubešić, Zrinka

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

Izvornik
5th Croatian Botanical Symposium - Book of abstracts / Rešetnik, Ivana ; Ljubešić, Zrinka - Zagreb : Hrvatsko Botaničko Društvo, 2016, 15-16

ISBN
978-953-8097-00-3

Skup
5th Croatian Botanical Symposium

Mjesto i datum
Primošten, Hrvatska, 22.09.2016. - 25.09.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
coccolithophores ; phytoplankton ; taxonomy ; Adriatic Sea

Sažetak
Coccolithophores, single cell photosynthetic algae, are one of the most important counterparts of marine phytoplankton. They are important primary producers and major contributors to the biogeochemical carbon cycle. By the calcifying process the cells produce calcium carbonated cocoliths that form the cell wall. Due to the production of dimethyl sulphide (DMS), coccolithophores contribute to the global sulphur cycle and indirectly to the enhanced reflection of solar radiation that influences temperatures of the oceans. Taxonomy of coccolithophores is extremely challenging due to the small cell size and species specific ultrastructural features visible only by scanning electron microscope (SEM). The life cycle is complex, including haploid and diploid phases that are morphologically distinct. Due to difficulties the coccolithophores taxonomy is under complete revision in the last two decades. Coccolithophores in the Adriatic Sea are poorly known. In order to test the hypothesis of coccolithophores as possible bio-tracers of specific water- masses, a crusie was conducted in southern Adriatic during winter period (February/March 2015, March 2016). 15 Stations on three transects (P-transect (P100-P1000), M-transect (M100-M1000), V-transect (V80-V100)) were chosen and total of 183 samples for phytoplankton and physical-chemical parameters were collected. Additional samples for in microscope analysis (SEM) of coccolithophores community were collected and immediately upon sampling filtered on 2μm-pore-size polycarbonate filter. For phylogenetic analyses, live coccolitophore cells were isolated with micropipette and agar plating tecniques and maintained in culture (agar and Guillard’s F/2 medium). Maximal abundance of microphytoplankton (1.97 × 104 cells/L) and nanophytoplankton (4.40 × 104 cells/L) were recorded in the surface samples on stations P100A and P120A. Microphytoplankton was dominated by diatoms while nanophytoplankton by coccolithophores. In depth analyses of coccolithophores reviled 54 taxa with maximum abundance (1.1 × 105 cells/L) recorded on Station P100A in the subsurface layer. Dominant species were Emiliania huxleyi, Syracosphaera molischii and Syracosphaera sp.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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