Naslov
Responses of Ammonia species to euxinic conditions in a seasonally stratified, marine Rogoznica Lake (Croatia)

Autori
Ćosović, Vlasta ; Ciglenečki Jušić, Irena ; Mikac, Nevenka ; Čančar, Marina ; Neral, Natali

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

Izvornik
International Conference Adriatic Biodiversity Protection – AdriBioPro2019 7-10 April 2019, Kotor, Montenegro, Book of Abstracts / - Kotor : Univerzitet Crne Gore, Institut za biologiju mora, 2019, 38-38

ISBN
978-9940-9613-2-9

Skup
Adriatic Biodiversity Conservation (AdriBioPro2019)

Mjesto i datum
Kotor, Crna Gora, 07.04.2019. - 10.04.2019

Vrsta sudjelovanja
Ostalo

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Rogoznica Lake ; Anoxia ; Ammonia spp. ; Dominance

Sažetak
Hydrology, chemistry, benthic metazoans and plankton communities in seasonally stratified, marine Rogoznica Lake (Eastern Adriatic coast, Croatia), have been studied extensively in the past two decades, but not the benthic protozoan community (mainly foraminifera) occurring on- or in- the sediment. Depending on the meteorological conditions, the lake fluctuates between meromictic and holomictic anoxic conditions. It provides site where the redoxcline is situated in the euxinic water column and in the sediment. The short cores collected from the depth of 9 m and 13 m in 2010, revealed well preserved assemblages of benthic foraminifera. Sediment cores were sliced for geochemical and biological studies with 2 cm resolution down to bottom of the core in order to follow the environmental changes in time. Foraminiferal tests occur in all studied samples and their number vary along the cores. The studied foraminiferal assemblages are composed of endopelic Ammonia species. Specimens of Ammonia parkinsoniana (d’Orbigny) and Ammonia tepida (Cushman) dominate. Tests are with lobate and smooth outlines and of the same size (6-7 chambers in the last whorl). The abundance of species shows positive correlation to the concentration of redox sensitive trace elements (vanadium and molybdenum in interval 16 to 20 cm and 18 to 22 cm, respectively) confirming that these species live and reproduce under euxinic conditions. In the same zone accumulation of TOC and total S content were found which all together indicate history of anoxic holomixis appearance in the water column of the lake.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Interdisciplinarne prirodne znanosti

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