Naslov
Phytoplankton pigment dynamics in marine lake fluctuating between stratified and holomictic euxinic conditions

Autori
Marguš, Marija ; Ahel, Marijan ; Čanković, Milan ; Ljubešić, Zrinka ; Terzić, Senka ; Hodak Kobasić, Vedranka ; Ciglenečki, Irena

Izvornik
Marine pollution bulletin (0025-326X) 191 (2023); 114931, 13

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

Ključne riječi
Phytoplankton ; Pigments ; Chlorophyll a ; Carotenoids ; Rogoznica lake ; Anoxia ; Holomixis ; Stratification

Sažetak
Biomass dynamics in the marine lake are strongly dependent on seasonal variability in vertical stratification, indicating rapid adaptation of phytoplankton to short-term changes in the water column. A small marine lake (Rogoznica Lake, Croatia), which fluctuates between stably stratified and holomictic euxinic conditions, was used as a model to study the phytoplankton responses to environmental perturbations, in particular the anoxic stress, caused by periodic holomixia. The epilimnion showed significant temporal and vertical variability with a chlorophyll a subsurface maximum with the highest biomass near the chemocline. Fucoxanthin- containing biomass (diatoms) dominated in the epilimnion in colder seasons and was first to recover after holomictic euxinic events. The shift towards the smaller groups prevailed during highly stratified water column conditions in warmer seasons. Results for the hypolimnion were more enigmatic, with high concentrations of alloxanthin, zeaxanthin, and violaxanthin indicating the presence of a viable small-size mixotrophic community under extreme conditions.

Izvorni jezik
Engleski

Znanstvena područja
Interdisciplinarne prirodne znanosti

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