Changes in Heterotrophic Picoplankton Community Structure after Induction of a Phytoplankton Bloom under Different Light Regimes.

Karayanni, Hera, Kormas, Konstantinos A., Moustaka-Gouni, Maria and Sommer, Ulrich (2019) Changes in Heterotrophic Picoplankton Community Structure after Induction of a Phytoplankton Bloom under Different Light Regimes. Open Access Diversity, 11 (10). Art.Nr. 195. DOI 10.3390/d11100195.

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Abstract

Bacterial and archaeal diversity and succession were studied during a mesocosm experiment that investigated whether changing light regimes could affect the onset of phytoplankton blooms. For this, 454-pyrosequencing of the bacterial V1-V3 and archaeal V3-V9 16S rRNA regions was performed in samples collected from four mesocosms receiving different light irradiances at the beginning and the end of the experiment and during phytoplankton growth. In total, 46 bacterial operational taxonomic units (OTUs) with ≥1% relative abundance occurred (22-34 OTUs per mesocosm). OTUs were affiliated mainly with Rhodobacteraceae, Flavobacteriaceae and Alteromonadaceae. The four mesocosms shared 11 abundant OTUs. Dominance increased at the beginning of phytoplankton growth in all treatments and decreased thereafter. Maximum dominance was found in the mesocosms with high irradiances. Overall, specific bacterial OTUs had different responses in terms of relative abundance under in situ and high light intensities, and an early phytoplankton bloom resulted in different bacterial community structures both at high (family) and low (OTU) taxonomic levels. Thus, bacterial community structure and succession are affected by light regime, both directly and indirectly, which may have implications for an ecosystem's response to environmental changes.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/228224
Keywords: bacterial and archaea diversity; light; climate change; phytoplankton blooms; 454-pyrosequencing
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-OEB Ökosystembiologie des Ozeans
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3390/d11100195
ISSN: 1424-2818
Projects: MESOAQUA
Date Deposited: 14 Nov 2019 12:45
Last Modified: 06 Feb 2020 09:06
URI: http://oceanrep.geomar.de/id/eprint/48232

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