Čanković, Milan; Dutour-Sikirić, Mathieu; Radić, Iris Dupčić; Ciglenečki-Jušić, Irena (2021) Bacterioneuston and Bacterioplankton Structure and Abundance in Two Trophically Distinct Marine Environments — a Marine Lake and the Adjacent Coastal Site on the Adriatic Sea. Microbial Ecology . ISSN 0095-3628 (In Press)
Abstract
Marine surface microlayer (SML) is a large and extreme marine environment with an important role in biogeochemical cycling and climate regulation. We explored the seasonal structure and abundance of bacterial assemblages in SML (bacterioneuston) and underlying water layer (ULW) (bacterioplankton) in eutrophic marine Rogoznica Lake and more oligotrophic coastal area of the adjacent Adriatic Sea. SML and ULW in each site were similar in pH, salinity, dissolved oxygen, oxygen saturation, and temperature. Rogoznica Lake was colder in winter and warmer in summer compared to the Adriatic Sea. Regarding nutrients, SML and ULW were notably different environments. SML was consistently enriched in nitrate, nitrite, orthophosphate, and total organic carbon than ULW in both investigated environments. Except in spring in Rogoznica Lake, bacterial abundance in SML was also significantly higher (p < 0.05) than in ULW. Both layers and sites show prominent seasonal variability. High-throughput 16S rRNA gene sequencing of DNA and cDNA revealed a considerable difference in bacterial assemblage structure, although study sites were < 200 m apart. Heterotrophs were predominant in both layers with pronounced spatial and temporal structural differences, except in autumn in Rogoznica Lake when, autotrophs became the dominant fraction under oxygen-deprived conditions. All these variations were driven by in situ conditions, the most important ones being total organic carbon and temperature (and additionally dissolved oxygen in Rogoznica Lake). This is especially important in terms of ongoing eutrophication, warming and deoxygenation, noticed not only in the Adriatic Sea and Rogoznica Lake but globally as well. Therefore, further structural and physiological changes in bacterioneuston and bacterioplankton assemblages can be expected.
| Item Type: | Article | ||||||||
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| Additional Information: | Rad je u studenome 2021 objavljen kao 'online first'. | ||||||||
| Uncontrolled Keywords: | microbial ecology; Adriatic Sea; Rogoznica Lake; marine surface microlayer; eutrophication | ||||||||
| Subjects: | NATURAL SCIENCES NATURAL SCIENCES > Biology NATURAL SCIENCES > Biology > Microbiology NATURAL SCIENCES > Interdisciplinary Natural Sciences NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science |
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| Divisions: | Division for Marine and Enviromental Research | ||||||||
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| Depositing User: | Milan Čanković | ||||||||
| Date Deposited: | 08 Dec 2022 12:51 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/7628 | ||||||||
| DOI: | 10.1007/s00248-021-01934-1 |
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