Diatoms in the extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast)

Malešević, Nikola; Ciglenečki-Jušić, Irena; Bura-Nakić, Elvira; Carić, Marina; Dupčić, Iris; Hrustić, Enis; Viličić, Damir; Ljubešić, Zrinka (2015) Diatoms in the extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast). Acta Botanica Croatica, 74 (2). pp. 333-343. ISSN 0365-0588

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Abstract

Marine lake system, Rogoznica Lake is a small, karstic, naturally eutrophic and euxinic marine environment. Abundance and temporal distribution of phytoplankton was investigated in relation to environmental conditions in the period from 1998. - 2013. The 36 determined diatoms contributed to 90% to the total phytoplankton abundance. The diatom composition is characterized by low species diversity and high single species abundance (up to 107 cells L-1). There were, in average, 2.6 diatom species per sample (maximum 14 diatom species per sample) reflecting extreme environmental conditions. Dominant diatoms Thalassionema nitzschioides, Cyclotella choctawhatcheeana, Dactyliosolen fragilissimus and Chaetoceros curvisetus repeatedly occurred alternating in domination in the lake during the whole research period. Some diatoms were dominant only in limited period like Cyclotella choctawhatcheeana (evident since 2001), and Pseudo-nitzschia spp. (evident in the period 2002 to 2009). It appears that interplay of environmental conditions such as variability in thermohaline and redox conditions, nutrient and reduced sulphur concentration influence the phytoplankton development and abundance in the lake.

Item Type:

Article

Uncontrolled Keywords:

Diatoms; phytoplankton; marine lake; extreme environmental conditions

Subjects:

NATURAL SCIENCES > Geology

Divisions:

Division for Marine and Enviromental Research

Projects:

Project title	Project leader	Project code	Project type
Plankton Populatin Structure in the Trophic Gradient in the South Adriatic (Struktura planktonskih populacija u trofičkom gradijentu u južnom Jadranu)-	Mirna Batistić	275-0000000-3186	MZOS
Nature of organic matter, interaction with traces and surfaces in environment (Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišu)-	Irena Ciglenečki-Jušić	098-0982934-2717	MZOS
Structure and development of microalgal communities in a trophic gradient (Struktura i razvoj zajednica mikroalga u trofičkom gradijentu)-	Damir Viličić	119-1191189-1228	MZOS