Naslov
Distribution patterns of key components of microbial food web in meromictic saline lake

Autori
Šestanović, Stefanija ; Bojanić, Natalia ; Šantić, Danijela

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

Izvornik
Abstract book / SAME12 – The 12th Symposium on Aquatic Microbial Ecology, August 28 – September 02, 2011, Rostock-Warnemünde, Germany / Klaus Jurgens and Matthias Labrenz - Rostock : Leibniz Institute for Baltic Sea Research Warnemunde (IOW), 2011

Skup
The 12th Symposium on Aquatic Microbial Ecology SAME 12

Mjesto i datum
Warnemünde, Njemačka; Rostock, Njemačka, 28.08.2011. - 02.09.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
heterotrophic bacteria; heterotrophic flagellates; autotrophic flagellates; nonloricate ciliates; Rogoznica Lake

Sažetak
Interactions among heterotrophic bacteria, heterotrophic (HNF) and autotrophic (ANF) flagellates and nonloricate ciliates were studied in water column samples collected from small meromictic saline lake (Rogoznica Lake, Croatia). Special emphasis was paid on relationships between investigated parameters and water column oxygen saturation. Bacterial abundances did not exhibit considerable changes in respect to water column hypoxia retaining at the similar values during both periods. However bacterial biomass and cell specific volume were much higher in hypoxic environment compared to oxic conditions. Low-DNA bacteria dominated the bacterial community in hypoxic environment accounting from 76 to 80% of total number of bacteria. The abundances of HNF and ANF decreased 5-7 times in the presence of low O2 concentrations implying their strong relation to oxygen saturation. No relationship between bacteria and their predators could be observed during hypoxia. However in oxic environment HNF exerted strong influence on bacterial population (R=0.45 n=14, p0.05). Also the activity of bacterial populations shifted toward the domination of high-DNA cells in oxic environment. Ciliate assemblages were dominated by oligotrichs. The abundance and biomass of nonloricate ciliates maintained at low values through the whole period of hypoxia. One month after establishing oxic conditions the ciliate populations showed the first sign of regeneration by increasing the number of small size organisms (20-40mm). In that period a strong impact on HNF population could be observed. As the result of this cascade effect, the top down control of HNF on bacteria diminished.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA