Items where Author is "Geisen, Markus"

Article

Ziveri, P. , Thoms, S. , Probert, I. , Geisen, M. and Langer, G. (2011)
A universal carbonate ion effect on stable oxygen isotope ratios in unicellular planktonic calcifying organisms ,

Biogeosciences Discussions., 8 , pp. 7575-7591 .

doi:10.5194/bgd-8-7575-2011 , hdl:10013/epic.37851

Article

Buck, B. H.

, Krause, G. , Michler-Cieluch, T. , Brenner, M.

, Buchholz, C.

, Busch, J. , Fisch, R. , Geisen, M. and Zielinski, O. (2008)
Meeting the quest for spatial efficiency: Progress and Prospects of Extensive Aquaculture within Offshore Wind Farms ,

Helgoland Marine Research 62:, pp. 269-281 .

doi:10.1007/s10152-008-0115-x , hdl:10013/epic.30690

Conference -Poster

Langer, G. , Ziveri, P. , Geisen, M. and Thoms, S. (2008)
Oxygen isotope fractionation during calcification in Calcidiscus leptoporus: The influence of carbonate chemistry ,

European Geosciences Union, General Assembly 2008, 13 18 April, Vienna, Austria. .

hdl:10013/epic.30459

Conference -Invited talk

Geisen, M. (2007)
CO2 und die Ozeane - eine düstere Zukunft? ,

Invited talk, Biodiversität und Klimawandel - Vernetzung der Akteure in Deutschland IV, 14-17 Okt., Bundesamt für Naturschutz, Vilm. .

hdl:10013/epic.28180

Article

Gussone, N. , Langer, G. , Geisen, M. , Steel, B. A. and Riebesell, U. (2007)
Calcium isotope fractionation in coccoliths of cultured Calcidiscus leptoporus, Helicosphaera carteri, Syracosphaera pulchra and Umbilicosphaera foliosa ,

Earth and Planetary Science Letters, 260 (3), pp. 505-515 .

doi:10.1016/j.epsl.2007.06.001 , hdl:10013/epic.27012

Preview

Conference -Invited talk

Geisen, M. (2007)
Coccolithophore response to ocean acidification ,

Invited talk, Seminar Series of the Faculty of Earth Sciences, 18 Jan., Eberhard Karls Universität, Tübingen. .

hdl:10013/epic.26235

Conference -Invited talk

Geisen, M. (2007)
Einfluß anthropogener CO2 Emissionen auf kalkbildende marine Organismen ,

Invited talk, McPlanet.com 2007, 04-06 May, Technische Universität, Berlin. .

hdl:10013/epic.26636

Conference -Invited talk

Pogoda, B. , Buck, B. H.

, Brenner, M.

and Geisen, M. (2007)
Forschungstauchen zur Weiterentwicklung Maritimer Biotechnologien: Offshore Aquakultur ,

1st International Symposium for Occupational Scientific Diving (ISOSD2007), Bremerhaven (Germany) 16th October 2007. .

hdl:10013/epic.28617

Article

Probert, I. , Fresnel, J. , Billard, C. , Geisen, M. and Young, J. R. (2007)
Light and Electron Microscope Observations of Algirosphaera robusta (Prymnesiophyceae) ,

Journal of phycology, 43 (2), pp. 319-332 .

doi:10.1111/j.1529-8817.2007.00324.x , hdl:10013/epic.25681

Preview

Conference -Conference paper

Zielinski, O. , Henkel, R. , Assheuer, J. , Berg-Pollack, A. , Buck, B. H.

, Geisen, M. and Kassen, D. (2006)
Assessment of Mechanical Loads and Environmental Conditions for Extensive Aquaculture Constructions within Offshore Wind Farms: First Results from the AquaLast Study Site ,

DEWEK 2006 - The International Technical Conference, Bremen (Germany). .

hdl:10013/epic.25475

Conference -Poster

Zielinski, O. , Assheuer, J. , Berg-Pollack, A. , Buck, B. H.

, Geisen, M. , Henkel, R. and Kassen, D. (2006)
Assessment of Mechanical Loads and Environmental Conditions for Extensive Aquaculture Constructions within Offshore Wind Farms: First Results from the AquaLast Study Site ,

DEWEK 2006 - The International Technical Conference, Bremen (Germany). .

hdl:10013/epic.31185

Conference -Conference paper

Zielinski, O. , Assheuer, J. , Berg-Pollack, A. , Buck, B. H.

, Geisen, M. , Henkel, R. and Kassen, D. (2006)
Assessment of mechanical loads and environmental conditions for extensive aquaculture constructions within offshore wind farms: First results from the AquaLast study site ,

Proceedings of DEWEK 2006: presented at the DEWEK 2006, 2223 November 2006, Bremen (Germany) .

hdl:10013/epic.31207

Inbook

Geisen, M. (2006)
Coccolithophoriden bauten Rügens Kreide ,

Faszination Meeresforschung : ein ökologisches Lesebuch / Gotthilf Hempel; Irmtraut Hempel; Sigrid Schiel (Hrsg.) Bremen : Hauschild, ISBN: 3-89757-310-5 .

hdl:10013/epic.25713

Conference -Invited talk

Geisen, M. and Langer, G. (2006)
Einfluss anthropogener CO2-Emissionen auf kalzifizierende marine Biota - ein Review ,

Invited talk, Biodiversität und Klima - Vernetzung der Akteure in Deutschland III, 24-27 Sept., Bundesamt für Naturschutz, Vilm. .

hdl:10013/epic.25801

Article

Crudeli, D. , Young, J. R. , Erba, E. , Geisen, M. , Ziveri, P. , Lange, G. J. d. and Slomp, C. P. (2006)
Fossil record of holococcoliths and selected hetero-holococcolith associations from the Mediterranean (Holocene-late Pleistocene): Evaluation of carbonate diagenesis and palaeoecological-palaeoceanographic implications ,

Palaeogeography palaeoclimatology palaeoecology, 237 (2), pp. 191-224 .

doi:10.1016/j.palaeo.2005.11.022 , hdl:10013/epic.25310

Conference -Poster

Gussone, N. , Langer, G. , Geisen, M. , Eisenhauer, A. , Riebesell, U. , Wefer, G. and Thoms, S. (2006)
Fractionation processes of calcium isotopes in marine coccolithophores ,

EGU General Assembly, 02.-07. April, Vienna, Austria, Geophysical Research Abstracts, Vol. 8 .

hdl:10013/epic.25673

Article

Langer, G. , Geisen, M. , Baumann, K. H. , Kläs, J. , Riebesell, U. , Thoms, S. and Young, J. R. (2006)
Species-specific responses of calcifying algae to changing seawater carbonate chemistry ,

Geochemistry Geophysics Geosystems, 7, Q09006 .

doi:10.1029/2005gc001227 , hdl:10013/epic.24967

Preview

Article

Andruleit, H. , Geisen, M. and Stäger, S. (2006)
Stereo-microscopy of coccolithophores - modern applications for imaging and morphological analysis ,

Journal of nannoplankton research, 28 (1), pp. 1-16 .

hdl:10013/epic.24238

Preview

Conference -Invited talk

Geisen, M. (2006)
Taxonomie und Biologie mariner Kalkalgen und ihre biogeochemische Rolle in globalen Stoffkreisläufen ,

Invited talk, Interdiszipliäre Expertentagung im Rahmen des Übereinkommens über die biologische Vielfalt, 21-25 Aug., Bundesamt für Naturschutz, Vilm .

hdl:10013/epic.25678

Conference -Invited talk

Geisen, M. , Buck, B. H.

, Berg-Pollack, A. , Assheuer, J. , Zielinski, O. and Kassen, D. (2006)
Technical Realization of Extensive Aquaculture Constructions in Offshore Wind Farms: Consideration of the Mechanical Loads ,

25th International Conference on Offshore Mechanics and Arctic Engineering, 8. June 2006, Hamburg (Germany). .

hdl:10013/epic.25453

Conference -Talk

Langer, G. , Geisen, M. , Riebesell, U. , Kläs, J. , Krug, S. , Baumann, K. H. and Young, J. R. (2006)
The response of Calcidiscus leptoporus and Coccolithus pelagicus to changing carbonate chemistry of seawater ,

EGU General Assembly, 02.-07. April, Vienna, Austria, Geophysical Research Abstracts, Vol. 8 .

hdl:10013/epic.25674

Conference -Talk

Gussone, N. , Langer, G. , Geisen, M. , Eisenhauer, A. , Riebesell, U. , Wefer, G. and Thoms, S. (2005)
Fractionation of Calcium Isotopes in Marine Coccolithophores. ,

Annual Meeting of the Geologische Vereinigung (GV), 24-29 September, Erlangen, Germany. .

hdl:10013/epic.25338

Article

Young, J. R. , Geisen, M. and Probert, I. (2005)
A review of selected aspects of coccolithophore biology with implications for paleobiodiversity estimation ,

Micropaleontology, 51 (4), pp. 267-288 .

hdl:10013/epic.22378

Preview

Article

Baumann, K. H. , Andruleit, H. , Böckel, B. , Geisen, M. and Kinkel, H. (2005)
The significance of extant coccolithophores as indicators of ocean water masses, surface temperature, and palaeoproductivity: a review. ,

Paläontologische Zeitschrift, 79 (1), pp. 93-112 .

doi:0031-0220/05/0079-0093 , hdl:10013/epic.21691

Preview

Conference -Invited talk

Geisen, M. and Hamm, C.

(2004)
Bionics and marine bio-organic structures - their potential technical application ,

Department Seminar Series, Florence University, Italy. .

hdl:10013/epic.22158

Conference -Invited talk

Geisen, M. , Langer, G. , Riebesell, U. , Probert, I. , Baumann, K. H. and Young, J. R. (2004)
Effects of CO2 variation on marine calcification - new evidence from coccolithophores ,

Invited Lecture, Palaeontology Department Seminar Series, Florence University, Italy .

hdl:10013/epic.22157

Inbook

Geisen, M. , Young, J. R. , Probert, I. , Sáez, A. G. , Baumann, K. H. , Bollmann, J. , Cros, L. , DeVargas, C. , Medlin, L. and Sprengel, C. (2004)
Species level variation in coccolithophores ,

Coccolithophores : from molecular processes to global impact / Hans R. Thierstein; Jeremy R. Young (Eds.) Berlin [u.a.] : Springer, ISBN: 3-540-21928-5 .

hdl:10013/epic.17314

Preview

Article

Sáez, A. G. , Probert, I. , Geisen, M. , Quinn, P. , Young, J. R. and Medlin, L. (2003)
Pseudo-cryptic speciation in coccolithophores ,

Proceedings of the national academy of sciences of the united states of america, 100 , pp. 7163-7168 .

hdl:10013/epic.17194

Preview

Article

Ziveri, P. , Stoll, H. M. , Probert, I. , Klaas, C.

, Geisen, M. , Ganssen, G. M. and Young, J. R. (2003)
Stable isotope "vital effects" in coccolith calcite ,

Earth and planetary science letters, 201 , pp. 137-149 .

hdl:10013/epic.17348

Preview

Thesis -PhD

Geisen, M. (2003)
Studies on the species level variation of selected coccolithophores ,

PhD thesis, University of London.

hdl:10013/epic.18992

Conference -Invited talk

Geisen, M. , Langer, G. , Riebesell, U. and Probert, I. (2003)
The effects of rising carbon dioxide levels on coccolithophore calcification ,

Invited talk, 2. Ereupt meeting, Rutgers University, New Brunswick, USA. .

hdl:10013/epic.20288

Conference -Poster

Langer, G. , Geisen, M. , Riebesell, U. and Probert, I. (2003)
The effects of rising pCO2 on coccolithophore calcification ,

2. Ereupt meeting, Rutgers University, New Brunswick, USA. .

hdl:10013/epic.25675

Article

Young, J. R. , Geisen, M. , Cros, L. , Kleijne, A. , Sprengel, C. , Probert, I. and Ostergaard, J. (2003)
A guide to extant coccolithophore taxonomy ,

Journal of Nannoplankton Research, Special Issue 1 .

hdl:10013/epic.19092

Article

Geisen, M. , Probert, I. and Young, J. R. (2002)
Coccolithophores for exhibition: A note ,

Journal of Nannoplankton Research, 24 (1), pp. 3-7 .

hdl:10013/epic.16147

Preview

Article

Geisen, M. , Billard, C. , Broerse, A. T. C. , Cros, L. , Probert, I. and Young, J. R. (2002)
Life-cycle associations involving pairs of holococcolithophorid species : intraspecific variation or cryptic speciation? ,

European Journal of Phycology, 37 , pp. 531-550 .

hdl:10013/epic.16142

Preview

Article

Stoll, H. M. , Ziveri, P. , Geisen, M. , Probert, I. and Young, J. R. (2002)
Potential and limitations of Sr/Ca ratios in coccolith carbonate: new perspectives from cultures and monospecific samples from sediments ,

Philosophical transactions of the royal society of london series a-mathematical physical and engineering sciences, 1793 , pp. 710-747 .

hdl:10013/epic.16143

Preview

Conference -Invited talk

Geisen, M. , Probert, I. , Steel, B. A. , Saez, A. and Young, J. R. (2002)
Syracosphaera pulchra - a model species to study fine scale variation and speciation in coccolithophores ,

Invited talk, Conference: Coccolithophores - from molecular processes to global impact, Ascona, Switzerland. .

hdl:10013/epic.20289

Conference -Invited talk

Geisen, M. , Probert, I. and Young, J. R. (2002)
Taxon based multidisciplinary research - CODENET ,

Invited talk, 1. EREUPT meeting, Rutgers University, New Brunswick, USA. .

hdl:10013/epic.20287

Article

Young, J. R. and Geisen, M. (2002)
Xenospheres - associations of coccoliths resembling coccospheres ,

Journal of Nannoplankton Research, 24 , pp. 27-35 .

hdl:10013/epic.16146

Preview

Conference -Invited talk

Geisen, M. , Young, J. R. , Garcia-Saez, A. , Probert, I. and Baumann, K. H. (2001)
Species level variation and speciation in Coccolithophores - new evidence from morphology, life-cycles and molecular genetics ,

ETH Zürich, Palaeontology Department Seminar Series, Zürich, Switzerland. .

hdl:10013/epic.22159

Conference -Invited talk

Geisen, M. (2000)
Investigating phylogeny - the use of microscopes in nannoplankton research ,

Invited talk, Society of Electron Microscopy Meeting, London School of Pharmacy, London, UK. .

hdl:10013/epic.20290

Article

Geisen, M. , Bollmann, J. , Herrle, J. O. , Mutterlose, J. and Young, J. R. (1999)
Calibration of the random settling technique for calculation of absolute abundances of calcareous nannoplankton ,

Micropaleontology, 45 (4), pp. 437-442 .

hdl:10013/epic.16144

Preview

Article

Bollmann, J. , Brabec, B. , Cortés, M. Y. and Geisen, M. (1999)
Determination of absolute coccolith abundances in deep-sea sediments by spiking with microbeads and spraying (SMS-method) ,

Marine Micropaleontology, 38 , pp. 29-38 .

hdl:10013/epic.16145

Preview

Conference -Invited talk

Geisen, M. (1999)
Microevolution and species level variation - the CODENET approach ,

Invited talk, Conference: The state of research on the coccolithophorid in Europe and Japan, National Institute for Environmental Studies (NIES), Tsukuba, Japan. .

hdl:10013/epic.20291

Article

Young, J. R. and Geisen, M. (1998)
Using spreadsheets to produce stacked histogram, stacked line and spindle charts ,

Journal of Micropalaeontology, 17 .

hdl:10013/epic.17352