engleski

Microbial succession during the regime shift in a marine meromictic lake(Rogoznica lake, Adriatic coast)

Water column of marine Rogoznica Lake (Croatia) is usually stratified into oxic mixolimnion and euxinic monimolimnion. On rare occasions the Lake exhibits holomixis during which these layers overturn, accompanied by oxidation of sulfide and development of colloidal sulfur, leading to establishment of euxinic conditions. Here we investigated microbial communities during stratified and holomictic conditions. An almost complete change in the structure of the prokaryotic communities was observed during holomixia. Chromatiaceae were replaced by Thioglobaceae family (SUP05 cluster), while the abundance of Planctomycetacia and Chlorobia increased. Phylum Epsilonbacteraeota, as well as Nanoarchaeota appeared. Drastic change of environmental conditions also decreased microbial diversity and the abundance as a response to this stressful event.

Stressors ; Adriatic Sea ; Bacteria ; Anoxic basin ; Vertical profile

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