The Bacterial Community of Marine Copepods

  • Marine copepods form one of the most abundant mesozooplankton groups in the oceans. They are important components of the marine food web and are a significant link between primary producers and higher trophic levels. They and are associated with various numbers of different bacteria, but to date little effort has been made to obtain an overview of the whole bacterial community associated with these animals. Therefore, this thesis aims to provide more information about their whole bacterial community. After determining the best suited DNA extraction technique for investigating the copepod-bacteria-consortia for further analysis with denaturing gradient gel electrophoresis (DGGE), four copepod key genera were investigated over a sampling period of two years in the German Bight, North Sea. The bacterial community-fingerprints of these different copepod taxa were compared for determining differences in the community composition and for temporal changes in community structure. To identify the members of the bacterial community associated with marine copepods, bacterial phylotypes of four copepod key- and three less frequently appearing genera were identified by 16S rRNA gene sequencing. Neither differences of the bacterial community-patterns among different copepod genera nor seasonal changes or succession were found throughout the survey. From the phylogenetic analysis, it could be concluded that the investigated marine copepods were associated with bacteria of four phyla: Proteobacteria, Bacteroidetes, Actinobacteria and Firmicutes. Roseovarius spp., Sulfitobacter spp., Psychrobacter spp. and Photobacterium spp. were the most abundant bacterial genera. This study contributes the first detailed insights of the whole bacterial community of different marine copepod genera. Additionally it provides insights whether the bacterial community composition is copepod genera-specific and/or whether it changes seasonally. These findings can provide a new platform for identifying bacterial symbionts and parasites of the copepods by investigating the function and abilities of the detected bacteria.

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Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Petra Brandt
Referee:Karen H. Wiltshire, Matthias Ullrich, Maarten Boersma, Gunnar Gerdts, Antje Wichels
Advisor:Karen H. Wiltshire
Persistent Identifier (URN):urn:nbn:de:101:1-2013052411116
Document Type:PhD Thesis
Language:English
Date of Successful Oral Defense:2012/12/10
Year of Completion:2010
Date of First Publication:2011/12/09
PhD Degree:Biology
School:SES School of Engineering and Science
Other Organisations Involved:International Max Planck Research School of Marine Microbiology (MarMic)
Library of Congress Classification:Q Science / QR Microbiology / QR100-131 Microbial ecology / QR106 Seawater. Marine microbiology
Call No:Thesis 2012/52

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