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

Marguš, Marija; Ahel, Marijan; Čanković, Milan; Ljubešić, Zrinka; Terzić, Senka; Hodak Kobasić, Vedranka; Ciglenečki-Jušić, Irena (2023) Phytoplankton pigment dynamics in marine lake fluctuating between stratified and holomictic euxinic conditions. Marine Pollution Bulletin, 191 . ISSN 0025-326X

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Phytoplankton; Pigments; Chlorophyll a; Carotenoids; Rogoznica lake; Anoxia; Holomixis; Stratification
Subjects:	NATURAL SCIENCES > Biology > Microbiology NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Kruženje sumpora i ugljika u morskom i slatkovodnom okolišu-SPHERE Irena Ciglenečki-Jušić IP-2013-11-1205 HRZZ Rogozničko morsko jezero kao model odziva ekosustava na promjene u okolišu-MARRES Irena Ciglenečki-Jušić IP-2018-01-1717 HRZZ
Depositing User:	Marija Marguš
Date Deposited:	28 Feb 2024 10:09
URI:	http://fulir.irb.hr/id/eprint/8659
DOI:	10.1016/j.marpolbul.2023.114931

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