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Ansattprofil

Friederike Urbassek Hoffmann

seniorkonsulent

Geofysisk institutt

Biogeokjemi

Stilling: seniorkonsulent

Telefon: 55 58 87 95

E-post:

Besøksadresse: Allégaten 70

Romnummer: 129A

Marine Biogeochemistry

Microbial Ecology

Microbial processes in symbiotic systems

Functional Microbiology

In situ quantification of microbial processes

N- and S-cycle

Environmental impact of sub seafloor CO2 storage

 

Adminitrative:

Expert evaluator for EU project proposals

Management of national and international projects

Teaching courses in project management

 

Scientific:

Microbial process quantification with isotope probing

Fluorescence in situ hybridisation (FISH)

Geo-histological techniques

Fluorescence microscopy

link to results in CRISTIN

Schöttner, Sandra; Hoffmann, Friederike; Cardenas, Paco; Rapp, Hans Tore; Boetius, Antje; Ramette, Alban.
Relationships between Host Phylogeny, Host Type and Bacterial Community Diversity in Cold-Water Coral Reef Sponges. PLoS ONE 2013 ;Volum 8.(2)

 

Radax R, Hoffmann F, Rapp HT, Leininger S, Schleper C (2012) Ammonia-oxidizing Archaea as Main Drivers of Nitrification in Cold-water Sponges. Environmental Microbiology 14: 909-923.

 

Schottner S, Wild C, Hoffmann F, Boetius A, Ramette A (2012) Spatial Scales of Bacterial Diversity in Cold-Water Coral Reef Ecosystems. Plos One 7: e32093, 32091-32011.

link to results in CRISTIN

Hoffmann F, Schlappy ML (2011) Sponges (Porifera) and sponge microbes. Encyclopedia of Geobiology,(Reitner J, Thiel V, ed.^eds.), p.^pp. 840-847. Springer.

Schläppy M-L, Weber M, Mendola D, Hoffmann F, Beer Dd (2010) Heterogeneous oxygenation resulting from active and passive flow in two Mediterranean sponges. Limnology & Oceanography 55: 1289-1300.

Schläppy M-L, Schöttner SI, Lavik G, Kuypers M, Beer Dd, Hoffmann F (2010) Evidence of nitrification and denitrification in high and low microbial abundance sponges. Marine Biology 157: 593-602.

Schläppy M-L, Schöttner S, Lavik G, Kuypers MMM, de Beer D, Hoffmann F (2010) Evidence for nitrification and denitrification in high and low microbial abundance sponges. Marine Biology 157: 593-602

Hoffmann F, Radax R, Woebken D, Holtappels M, Lavik G, Rapp HT, Schläppy M-L, Schleper C, Kuypers MMM (2009) Complex nitrogen cycling in the sponge Geodia barretti. Environmental Microbiology 11 (9): 2228-2243.

Schöttner S, Hoffmann F, Wild C, Rapp HT, Boetius A, Ramette A (2009) Cold-water coral-mediated effects on the structure of associated bacterial communities. ISME Journal 3: 756-759

Bayer K, Siegl A, Schmitt S, Hoffmann F, Hentschel U (2008) Unravelling microbial diversity and metabolism in marine sponges. Nova Acta Leopoldina NF 96 Nr. 356: 71-78

Hoffmann F, Røy H, Bayer K, Hentschel U, Pfannkuchen M, Brümmer F, Beer Dd (2008) Oxygen dynamics and transport in the Mediterranean sponge Aplysina aerophoba. Marine Biology 153: 1257-1264

Wild C, Mayr C, Wehrmann L, Schöttner S, Naumann M, Hoffmann F, Rapp HT (2008) Organic matter release by cold-water corals and its implication for fauna-microbe interaction. Marine Ecology Progress Series 372: 67-75

Hoffmann F, Sauter E, Sachs O, Røy H, Klages M (2007) Oxygen distribution in Tentorium semisuberites and in its habitat in the Arctic deep sea. In: Custódio M, Lôbo-Hajdu G, Hajdu E, Muricy G (eds) Porifera Research: Biodiversity, Innovation, Sustainability. Série Livros. Museu Nacional, Rio de Janeiro: 379-382

Spetland F, Rapp HT, Hoffmann F, Tendal OS (2007) The reproductive cycle of Geodia barretti (Bowerbank, 1888)(Porifera, Astrophorida) in two Scandinavian fjords. In: Custódio M, Lôbo-Hajdu G, Hajdu E, Muricy G (eds) Porifera Research: Biodiversity, Innovation, Sustainability. Série Livros. Museu Nacional, Rio de Janeiro:613-620

Schläppy M-L, Hoffmann F, Røy H, Wijffels RH, Mendola D, Sidri M, Beer Dd (2007) Oxygen dynamics and flow patterns of Dysidea avara (Porifera, Demospongiae). Journal of the Marine Biological Association of the United Kingdom. 86: 1677-1682

Hoffmann F, Rapp HT, Reitner J (2006) Monitoring microbial community composition by fluorescence in situ hybridisation during cultivation of the marine cold-water sponge Geodia barretti. Marine Biotechnology 8: 373-379

Ianora A, Boersma M, Casotti R, Fontana A, Harder J, Hoffmann F, Pavia H, Poulet SA, Toth G (2006) New trends in marine chemical ecology. Estuaries and Coasts 29: 531-551

Pape T, Hoffmann F, Queric N-V, Juterzenka Kv, Reitner J, Michaelis W (2006) Dense populations of Archaea associated with the hadromerid demosponge Tentorium semisuberites from Arctic deep waters. Polar Biology 29: 662-667

Hoffmann F, Larsen O, Rapp HT, Osinga R (2005) Oxygen dynamics in choanosomal sponge explants. Marine Biology Research 1: 160-163

Hoffmann F, Larsen O, Thiel V, Rapp HT, Pape T, Michaelis W, Reitner J (2005) An anaerobic world in sponges. Geomicrobiology Journal 22: 1-10

Hoffmann F, Rapp HT, Peters H, Pape T, Reitner J (2004) Sedimentary inclusions in the deep-water sponge Geodia barretti (Geodiidae, Demospongiae) from the Korsfjord, Western Norway. Sarsia 89: 1-8

Schönberg CHL, Hoffmann F, Gatti S (2004) Using microsensors to measure sponge physiology. Bollettino dei Musei e degli Istituti Biologici dell' Universitá die Genova 68: 593-604

Hoffmann F, Rapp HT, Zöller T, Reitner J (2003) Growth and regeneration in cultivated fragments of the boreal deep water sponge Geodia barretti Bowerbank, 1858 (Geodiidae, Tetractinellida, Demospongiae). Journal of Biotechnology 100: 109-118

Hoffmann F, Janussen D, Dröse W, Arp G, Reitner J (2003) Histological investigation of organisms with hard skeletons: a case study of siliceous sponges. Biotechnic and Histochemistry 78: 191-199

Reitner J, Hoffmann F (2003) Porifera-Zonierungen in Kaltwasser-Korallenriffen (Sula Rücken, Norwegen. In: Gradstein SR, Willmann R, Zizka G (eds) Biodiversitätsforschung: Die Entschlüsselung der Artenvielfalt in Raum und Zeit, Kleine Senckenberg-Reihe 45. E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, pp 75-87

Osinga R, Armstrong E, Burgess JG, Hoffmann F, Reitner J, Schumann-Kindel G (2001) Sponge-microbe associations and their importance for sponge bioprocess engineering. Hydrobiologia 461: 55-62

Glud RN, Holby O, Hoffmann F, Canfield DE (1998) Benthic mineralization and exchange in Arctic sediments (Svalbard, Norway). Marine Ecology Progress Series 173: 237-251

 

 

Høst 2012: BIO-318

Vår 2012: GEOVI-344

Høst 2011: BIO-318

Vår 2011: GEOVI-344

Høst 2010: BIO-318

Project management

Research consultant