Dr. Astrid Gärdes

Junior Research Group Leader

Department: Biogeochemistry and Geology
Working Group: WG Tropical Marine Microbiology

Phone: +49 421 23800 - 64

Fax: +49 421 23800 - 30

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Room: 2120 (1st floor)

Research interests

- Microbial community response to anthropogenic perturbations
- Bacterial-algal interactions in changing environmental conditions
- Marine aggregate dynamics in euthrophic costal systems
- Microbial activity and transformation of DOC to POC
- The effects of fish farm effluents on particle sedimentation rates


Peer-reviewed journals

Schwieder H., Lukman M.,Teichberg M., Wild C, Gärdes A. 2015. Changes of bacterial communities of different reef habitats influenced by environmental parameters and eutrophication in the Spermonde Archipelago, Indonesia. In preparation.

Cárdenas A., Meyer FM., Schwieder H., Wild C., Gärdes, A. 2015. The formation of aggregates in coral reef waters under elevated concentrations of dissolved inorganic and organic carbon: A mesocosm approach. Marine Chemistry. Article in Press, Available online 9 April 2015.

Barker RA., Tisnado J.,Lambert L., Gärdes A., Carrano MW., Carrano, PN., Gillian C., Carrano, CJ. 2015 Molecular characterization of a homolog of the ferric-uptake regulator, Fur, from the marine bacterium Marinobacter algicola DG893.BioMetals 28: 197-206

Gärdes A., Triana C., Amin SA., Green DH., Romano A., Trimble L., Carrano CJ. 2013. Detection of photoactive siderophore biosynthetic genes in the marine environment. BioMetals 26: 507-516.

Amin SA., Green DH., Gärdes A., Romano A., Trimble L., Carrano CJ.2012. Siderophore-mediated iron uptake in two clades of Marinobacter spp. Associated with phytoplankton: the role of light. BioMetals 25:181-192.

Amin SA., Green DH., Waheeb DA., Gärdes A., Carrano CJ. 2012. Iron transport in the genus Marinobacter. BioMetals 25:135-147.

Gärdes A., Ramaye Y., Grossart H-P., Passow U., Ullrich MS. 2011. Effects of Marinobacter adhaerens HP15 on polymer production by Thalssiosira weissflogii under nutrient limitation. Marine Ecology Progress Series 461: 1–14. *Featured Article

Käppel E†., Gärdes A†., Seebah S., Torres-Monroy I., Grossart H-P., Ullrich MS. 2011. Development of a genetic system for Marinobacter adhaerens sp. HP15 involved in aggregate formation by interacting with diatom cells. Journal of Microbiological Methods 87:176–18. †authors contributed equally

Gärdes A., Käppel E., Seebah S., Grossart H-P., Ullrich MS. 2011. Marinobacter adhaerens HP15 sp. nov., prominent in aggregate formation with the diatom Thalassiosira weissflogii. International Journal of Systematic and Evolutionary Microbiology 62:124-128.

Gärdes A., Iversen M., Grossart H-P., Passow U., Ullrich MS. 2011. Diatom-associated bacteria are required for aggregation of Thalassiosira weissflogii. The ISME Journal 5:436-445.

Gärdes A., Theeling H., Käppel E., Seebah S., Grossart H-P., Ullrich MS., Glöckner FO. 2010. Complete genome sequence of Marinobacter adhaerens (HP15w). Standards in Genomic Sciences 3:97-107.

Scheffel A., Gärdes A., Grünberg K., Wanner G., Schüler D. 2008. The major magnetosome proteins MamGFDC are not essential for magnetite biomineralization in Magnetospirillum gryphiswaldense but regulate the size of magnetosome crystals. Journal of Bacteriology 190: 377-386.


Gärdes A, Schwieder HF, Einsporn MH. Aquatic microorganisms: between producers, consumers and pathogens. In: Einsporn MH, Wiedling J, Beilfuss S, editors. From coast to deep sea: multiscale approaches to marine sciences: Glimpse Reviews. Eigenverlag - Deutsche Gesellschaft für Meeresforschung (DGM) e.V. 2013. p. 29-46.


Astrid Gärdes (2010) “A bilateral model system for the molecular investigation of diatom-bacteria interactions” PhD Thesis, Molecular Microbiology Group at Jacobs University Bremen and the Max Planck Institute for Marine Microbiology Bremen.

Astrid Gärdes (2007) “Molecular Investigation of Diatom-Bacteria Interaction” Master Thesis, at Jacobs University Bremen and the Max Planck Institute for Marine Microbiology Bremen.

Astrid Gärdes (2005) “Establishment of the Cre/loxP recombinase-mediated generation of unmarked gene deletion in Magnetospirillum gryphiswaldense” Diploma at Max Planck Institute for Marine Micobology Bremen and the University of Applied Science Emden, Germany.