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Other research product . Other ORP type . 2017

Bacterial growth and mortality after deposition of saharan dust and mixed aerosols in the eastern mediterranean sea: A mesocosm experiment

Tsiola, Anastasia; Tsagaraki, Tatiana M.; Giannakourou, Antonia; Nikolioudakis, Nikolaos; Yücel, Nebil; Herut, Barak; Pitta, Paraskevi;
Open Access
English
Published: 01 Jan 2017
Publisher: Frontiers Media S. A
Country: Turkey
Abstract

The impact of viral lysis and grazing by flagellates on bacterioplankton production was assessed during a mesocosm experiment in the Eastern Mediterranean Sea, in response to Saharan dust (SD) vs. mixed aerosols (A) addition. The results highlight a positive effect on bacterial abundance, production and growth rate (~1.2, ~2.4, and ~1.9-fold higher than the controls) in both SD and A, which was also confirmed by the increased portion of high DNA content bacteria (up to 48% of the bacterial community). Lytic viral production and the portion of bacterial production lost due to viral lysis were lower in SD and A after dust addition than in the controls (0.33 ± 0.17 × 106 virus-like particles mL-1 h-1 and 6 ± 4%, respectively). Potential ingestion rate of bacteria by flagellates increased upon dust enrichment, but did not differ between mesocosms. Larger predators possibly down regulated flagellate abundance, and the calculated portion of bacterial production lost due to flagellate grazing was probably an artifact. Higher frequency of lysogenic cells in A compared to SD and the controls four days after dust addition may reflect faster phosphorus limitation in A, due to receiving less dissolved inorganic phosphorus and more dissolved inorganic nitrogen than SD.

Science Citation Index Expanded

WOS: 000457690600057

Subjects

Mesocosm Experiment, East Mediterranean, Dust, Aerosols, lysis, lysogeny, Viruses | Bacteriophages | Viral abundance, Environmental Sciences | Marine & Freshwater Biology

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Funded by
EC| MESOAQUA
Project
MESOAQUA
Network of leading MESOcosm facilities to advance the studies of future AQUAtic ecosystems from the Arctic to the Mediterranean
  • Funder: European Commission (EC)
  • Project Code: 228224
  • Funding stream: FP7 | SP4 | INFRA
Related to Research communities
European Marine Science Marine Environmental Science : Network of leading mesocosm facilities to advance the studies of future aquatic ecosystems from the Arctic to the Mediterranean
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