Astrid Gärdes

Dr. Astrid Gärdes

Junior Research Group Leader

Department: Biogeochemistry and Geology
Working Groups: 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.

Office: Fahrenheitstr. 6, Annexe
28359 Bremen
Room: 2120 (1st floor)

ZMT Field data available in these locations

Please email researcher for details.

Curriculum Vitae : Dr. Astrid Gärdes

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

Curriculum Vitae Dr. Astrid Gärdes


Peer-reviewed journals

1. Moncada C., Hassenrück H., Gärdes A., Conaco C., Microbial community composition of sediments influenced by intensive mariculture systems. FEMS Microbial Ecology (2019) 18-8-0436

2. Bachmann J., Heimbach T., Hassenrück C., Germán A. Kopprio G.A., Iversen M.H., Grossart H., Gärdes A., Environmental drivers of free-living vs. particle-attached bacterial community composition in the Mauritania upwelling system. Frontiers in Microbiology (2018); 9: 2836.

3. *Guevara N., *Hasenrück C., Buttigieg P.L., Gärdes A., Characterization of bacterioplankton communities and quantification of organic carbon pools off the Galapagos Archipelago under contrasting environmental conditions. PeerJ 6 (2018):e5984

4. Hanke I., Ampe B., Kunzmann A., Gärdes A., Aerts J.,Thermal stress response of juvenile milkfish (Chanos chanos) quantified by ontogenetic and regenerated scale cortisol. Aquaculture (2019) 500, 24-30

5. Kopprio G.A., Dutto M.S., Garzón Cardona J.E., Gärdes A., Lara R.J., Graeve M., Biogeochemical markers across a pollution gradient in a Patagonian estuary: a multidimensional approach of fatty acids and stable isotopes. Marine Pollution Bulletin (2018) 137, 617-626

6. Alfiansah YR, Hassenrück C., Kunzmann A., Harder J., Gärdes A. Bacterial abundance and community composition in pond water from shrimp aquaculture system with different stocking densities. Frontiers in Microbiology (2018); 9: 2457

7. Kegler H. F., Kegler P., Luckmann A., Gärdes A. Small scale shifts in microbial communities due to local island populations in the Spermonde Archipelago, Indonesia. PeerJ 6 (2018): e4555

8. Pogoreutz C, Rädecker N, Cárdenas A, Gärdes A, Wild C, Voolstra CR. 2018. Dominance of Endozoicomonas bacteria throughout coral bleaching and mortality suggests structural inflexibility of the Pocillopora verrucosa microbiome. Ecology and Evolution Volume 8 (4): 2240–2252 doi: 0.1002/ece3.3830

9. Pogoreutz C, Rädecker N, Cárdenas A, Gärdes A., Wild C, Voolstra CR. 2017 Nitrogen Fixation Aligns with nifH Abundance and Expression in Two Coral Trophic Functional Groups. Frontiers in Microbiology. 2017; 8:1187. doi:10.3389/fmicb.2017.01187.

10. Cárdenas A., Neave M., Haroon M.F., Pogoreutz C., Rädecker N., Wild C., Gärdes A., Voolstra C.R. Excess of labile carbon promotes virulence gene expression in coral reef bacterioplankton populations: implication for reef ecosystem health. 2017 ISME J. volume 12, 59–76 (2018) doi: 10.1038/ismej.2017.142.

11. Pogoreutz C, Rädecker N, Cárdenas A, Gärdes A., Voolstra CR, Wild C. 2017. Sugar enrichment provides evidence for a role of nitrogen fixation in coral bleaching.
Glob Chang Biol. Volume 23 (9): 3838–3848 10.1111/gcb.13695

12. Teichberg M., Wild C., Bednarz V.N., Kegler H.F., Lukman M., Gärdes A., Heiden J., Weiand L., Abu N., Nasir A., Miñarro S., Ferse S.C.A., Reuter H., Plass-Johnson J.G. 2018. Spatio-temporal patterns in coral reef communities of the Spermonde Archipelago, 2012-2014, I: Comprehensive reef monitoring reveals two indices that reflect changes in reef health. Frontiers in Marine Science 5,

13. Plass-Johnson, J.G., Bednarz V.N., Kegler H., Heiden J., Weiand L., Wild C., Gärdes A., Lukman M., Reuter H., Sebastian C. A. Ferse S. C. A., Teichberg M. 2018. Spatio-temporal patterns in the coral reef communities of the Spermonde Archipelago, 2012-2014, II: Fish assemblages display structured variation related to benthic. Frontiers in Marine Science 5, 36

14. Kegler P, Kegler H.F, Gärdes A., Ferse S.C.A, Lukman M., Alfiansah Y.R., Hassenrück C., Kunzmann A. 2017 .Bacterial biofilm communities and coral larvae settlement at different levels of anthropogenic impact in the Spermonde Archipelago, Indonesia. Frontiers in Marine Science 4 (2017): 270.

15. Kegler H., Luckman A., Teichberg M., Plas-Johnsen J., Hassenrück C., Wild C., Gärdes A. 2017. Bacterial community composition and potential driving factors in different reef habitats of the Spermonde Archipelago, Indonesia. Front. Microbiol. 8 (2017): 662

16. Cárdenas A, Meyer F,W., Schwieder H., Wild C., Gärdes A., 2015. The formation of aggregates in coral reefs under high dissolved inorganic and organic carbon (DIC and DOC) concentrations: A mesocosm approach. Marine Chemistry 175, 47-55.
17. Barker R.A, Tisnado J., Gillian C., Lambert L.A., Gärdes A., Carrano P.A., Carrano C.J. 2015. Molecular Characterization of a Homolog of the Ferric-uptake regulator, Fur, from the Marine Bacterium Marinobacter algicola DG893. Biometals 28(1):197-206.

18. Yarimizu K., Polido G., Gärdes A., Carter M., Hilbern M., Carrano CJ. 2014. Evaluation of Photo-reactive Siderophore Producing Bacteria Before, During and After a Bloom of the Dinoflagellate Lingulodinium polyedrum. Metallomics 6(6):1156-63.

19. 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(3): 507-516.

20. Amin SA., Green DH., Waheeb DA., Gärdes A., and Carrano C.J. “Iron Transport in the genus Marinobacter.” BioMetals, 25,135-147 (2012).

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

22. Gärdes A., Ramaye Y., Grossart H-P., Passow U., Ullrich MS. 2012. Effects of Marinobacter adhaerens HP15 on polymer production by Thalssiosira weissflogii under nutrient limitation. Marine Ecology Progress Series 461: 1–14. *Featured Article

23. Sonnenschein 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

24. Käppel E., Gärdes A., 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.

25. 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.

26. 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.

27. 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.

28. Vollberg, F.; Walther, M.; Gärdes, A.; Moosdorf, N. Modeling the Potential of Submarine Groundwater Discharge to Facilitate Growth of Vibrio cholerae Bacteria. Hydrology 20196, 39.


Klüger nutzen - besser schützen. Bremer Forschung an tropischen Küsten". Falkenberg Verlag 2017, Gärdes A.; Hrsg Hempel und Hornidge

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.

Kegler P, Kegler HF, Kunzmann A, Gärdes A, Alfiansah YR, Lukman M, Hassenrück C, Ferse CA (2016) Different levels of anthropogenic impact influence coral larvae settlement and bacterial biofilm communities in the Spermonde Archipelago, Indonesia. Proceedings of the 13th International Coral Reef Symposium, Honolulu: 145-157


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.