Naslov
Relationships between phytoplankton crop, primary production and accumulation of carbohydrates in the northern Adriatic

Autori
Ahel, Marijan ; Tepić, Nataša ; Precali, Robert ; Terzić, Senka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Abstracts: Second international conference: Oceanography of the eastern Mediterranean and Black Sea / Yilmaz, A. ; Salihoglu, I. ; Mutle, E. - Ankara : Institute of Marine Science - Middle East Technical University, 2002, 695-701

Skup
Second international conference: Oceanography of the eastern Mediterranean and Black Sea

Mjesto i datum
Ankara, Turska, 14.10.2002. - 18.10.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
phytoplankton; primary production; carbohydrates; northern Adriatic;

Sažetak
Studying seasonal and spatial patterns of CHO is one of the key prerequisites for understanding the environmental factors and mechanisms potentially leading to large-scale mucilage events, which have become more frequent in the northern Adriatic during the last two decades. This paper deals with the annual cycle of particulate (PTCHO) and dissolved carbohydrates (DTCHO) during 1998 with a special emphasis on their relationship to primary production and phytoplankton crop. Samples for the carbohydrate, photosynthetic pigment and primary production analyses were collected in the central part of the northern Adriatic at several stations along the transect Po River mouth-Rovinj. DTCHO and PTCHO were determined spectrophotometrically using the MBTH method, while the characterisation of the phytoplankton crop was based on HPLC determinations of chlorophyll and carotenoid photosynthetic pigments. The distribution of CHO in the northern Adriatic showed a rather pronounced spatial and temporal variability. The distribution patterns of PTCHO and DTCHO were rather different. The concentration of PTCHO varied mainly in the range from 20-200 &micro ; ; g C/l with two peaks, coinciding with maxima of the phytoplankton crop after typical spring and autumn freshets. The distribution of DTCHO, however, showed no correlation with chlorophyll a and reached maximum values during summer stratification (350-450 &micro ; ; g C/l), when the phytoplankton crop remained typically low. The reason for such a situation was most probably an enhanced primary production in light-favoured conditions as well as release of carbon-rich organic matter by summer phytoplankton in nitrogen-depleted conditions. This process seems to be effective only in the upper layer of the stratified water column, while the concentration of DTCHO in the bottom layer remained low (100-200 &micro ; ; g C/l) and rather constant throughout the year.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA