Aarhus University Seal / Aarhus Universitets segl

Morten Frederiksen

PhD, DSc, Senior Researcher

Profile photo

Morten Frederiksen

Senior Researcher

  • Department of Bioscience - Arctic Ecosystem Ecology
  • Arctic Research Centre - Arctic Research Centre, Roskilde
Postal address:
Frederiksborgvej 399

Email: mfr@bios.au.dk

Phone: +4587158673

My research

My research is focused along two lines of inquiry. Firstly, I am interested in the role of seabirds as top predators in marine ecosystems, and how they adapt to changing environments. Secondly, I use demographic analyses and modelling to investigate how changes in animal populations over time are determined by the environment they live in, including both abiotic, biotic and anthropogenic factors. My work is often linked to applied issues in conservation biology or wildlife management.


2007-Senior researcher, Aarhus University
2002-2007Senior researcher, Centre for Ecology & Hydrology, UK


2014DSc, Aarhus University
1998PhD, University of Copenhagen
1991MSc, University of Copenhagen

Research outputs

Drivers of Spatiotemporal Variation in Survival in a Flyway Population: A Multi-Colony Study

Tjørnløv, R. S., Ens, B. J., Öst, M., Jaatinen, K., Karell, P., Larsson, R., Christensen, T. K. & Frederiksen, M., Oct 2020, In : Frontiers in Ecology and Evolution. 8, 566154.

Danish scientific appraisal of HELCOM’s and OSPAR’s indicators in relation to the monitoring programme under the marine strategy framework directive: status 2020

Bregnballe, T., Christensen, J. P. A., Frederiksen, M., Galatius, A., Hansen, J. L. S., Jakobsen, H. H., Kyhn, L. A., Markager, S., Petersen, I. K., Strand, J., Stæhr, P. A., Sveegaard, S. & Tougaard, J., Apr 2020, Aarhus: DCE - Nationalt Center for Milljø og Energi. 114 p. (Aarhus Universitet. Nationalt Center for Miljo og Energi. Teknisk Rapport; No. 168).

Recent increase in annual survival of nesting female Common Scoter Melanitta nigra in Iceland

Petersen, I. K., Frederiksen, M., Petersen, A., Robson, H. J., Einarsson, Á., Nielsen, R. D., Harrison, A. L., Cervencl, A. & Fox, A. D., 1 Jan 2020, (Accepted/In press) In : Journal of Ornithology.

Do neck collars affect survival of geese in Europe?

Frederiksen, M. & Fox, A. D., 2020.

Using integrated population models for insights into monitoring programs: an application using pink-footed geese

Johnson, F. A., Zimmerman, G. S., Jensen, G. H., Clausen, K. K., Frederiksen, M. & Madsen, J., 2020, In : Ecological Modelling. 415, 13 p., 108869.

Demographic reconstruction from ancient DNA supports rapid extinction of the great auk

Thomas, J. E., Carvalho, G. R., Haile, J., Rawlence, N. J., Martin, M. D., Ho, S. Y., Sigfússon, A., Jósefsson, V. A., Frederiksen, M., Linnebjerg, J. F., Samaniego Castruita, J. A., Niemann, J., Sinding, M. H. S., Sandoval-Velasco, M., Soares, A. E., Lacy, R., Barilaro, C., Best, J., Brandis, D., Cavallo, C., Elorza, M., Garrett, K. L., Groot, M., Johansson, F., Lifjeld, J. T., Nilson, G., Serjeanston, D., Sweet, P., Fuller, E., Hufthammer, A. K., Meldgaard, M., Fjeldså, J., Shapiro, B., Hofreiter, M., Stewart, J. R., Gilbert, M. T. P. & Knapp, M., Nov 2019, In : eLife. 8, 35 p., 47509.

Quantifying the relative impact of hunting and oiling on Brünnich’s guillemots in the North-west Atlantic

Frederiksen, M., Linnebjerg, J. F., Merkel, F. R., Wilhelm, S. I. & Robertson, G. J., Aug 2019, In : Polar Research. 38, 11 p., 3378.

Linking demographic and food-web models to understand management trade-offs

Kadin, M., Frederiksen, M., Niiranen, S. & Converse, S. J., Jul 2019, In : Ecology and Evolution. 9, 15, p. 8587-8600 14 p.

Consequences of past and present harvest management in a declining flyway population of common eiders Somateria mollissima

Tjørnløv, R. S., Pradel, R., Choquet, R., Christensen, T. K. & Frederiksen, M., 2019, In : Ecology and Evolution. 9, 22, p. 12515-12530 16 p.

Population size and habitat use of breeding seabirds in Northeast Greenland: Field studies 2017-2018

Frederiksen, M., Mosbech, A., Andersson, A., Castro, A. C., Egevang, C., Fort, J., Grémillet, D., Linnebjerg, J. F., Lyngs, P., Nielsen, H. H. & Koefoed Rømer, J., 2019, Aarhus: Aarhus University, DCE - Danish Centre for Environment and Energy. 48 p. (Scientific Report from DCE – Danish Centre for Environment and Energy; No. 337).

Non-breeding areas of three sympatric auk species breeding in three Icelandic colonies

Linnebjerg, J. F., Frederiksen, M., Kolbeinsson, Y., Snaethórsson, A. Ö., Thórisson, B. & Thórarinsson, T. L., Oct 2018, In : Polar Biology. 41, 10, p. 1951-1961 11 p.

Ringmærkningens fremtid i Danmark? En kommentar til Meltofte

Frederiksen, M., Bregnballe, T. & Fox, A. D., 12 Sep 2018, In : Dansk Ornitologisk Forenings Tidsskrift. 112, 3, p. 106-107 2 p.

Changes in nesting success and breeding abundance of Spectacled Eiders Somateria fischeri in the Chaun Delta, Chukotka, Russia, 2003-2016

Solovyeva, D. V., Vartanyan, S. L., Frederiksen, M. & Fox, A. D., Apr 2018, In : Polar Biology. 41, 4, p. 743-751 9 p.

A test of positive association for detecting heterogeneity in capture for capture-recapture data

Jeyam, A., McCrea, R. S., Bregnballe, T., Frederiksen, M. & Pradel, R., 14 Feb 2018, In : Journal of Agricultural, Biological, and Environmental Statistics. 23, 1, p. 1-19

Where do wintering cormorants come from? Long-term changes in the geographical origin of a migratory bird on a continental scale

Frederiksen, M., Korner-Nievergelt, F., Marion, L. & Bregnballe, T., 2018, In : Journal of Applied Ecology. 55, 4

Little auk and thick-billed murre in the NOW Polynya

Mosbech, A., Johansen, K. L., Cuyler, C., Frederiksen, M., Linnebjerg, J. F., Lyngs, P. & Merkel, F. R., 23 Nov 2017.

Multi-colony tracking reveals spatio-Temporal variation in carry-over effects between breeding success and winter movements in a pelagic seabird

Bogdanova, M. I., Butler, A., Wanless, S., Moe, B., Anker-Nilssen, T., Frederiksen, M., Boulinier, T., Chivers, L. S., Christensen-Dalsgaard, S., Descamps, S., Harris, M. P., Newell, M., Olsen, B., Phillips, R. A., Shaw, D., Steen, H., Strøm, H., Thórarinsson, T. L. & Daunt, F., 31 Aug 2017, In : Marine Ecology Progress Series. 578, p. 167-181 15 p.


Daunt, F., Mitchell, I. & Frederiksen, M., 27 Jul 2017, MCCIP Science Review 2017. p. 42-46

State of the Arctic Marine Biodiversity Report

Barry, T. (ed.), Price, C. (ed.), Olsen, M. (ed.), Christensen, T. (ed.) & Frederiksen, M. (ed.), 11 May 2017, CAFF International Secretariat, Akureyri, Iceland. 200 p.

Synthesis: Status and trends of Arctic marine biodiversity and monitoring

Frederiksen, M., 11 May 2017, State of the Arctic Marine Biodiversity Report. CAFF International Secretariat, Akureyri, Iceland, p. 175-193

Variation in growth drives the duration of parental care: a test of Ydenberg’s model

Elliott, K. H., Linnebjerg, J. F., Burke, C., Gaston, A. J., Mosbech, A., Frederiksen, M. & Merkel, F. R., 17 Apr 2017, In : The American Naturalist. 189, 5, p. 526-538

Migration and wintering of a declining seabird, the thick-billed murre Uria lomvia, on an ocean basin scale: Conservation implications

Frederiksen, M., Descamps, S., Erikstad, K. E., Gaston, A. J., Gilchrist, H. G., Grémillet, D., Johansen, K. L., Kolbeinsson, Y., Linnebjerg, J. F., Mallory, M. L., McFarlane Tranquilla, L. A., Merkel, F. R., Montevecchi, W. A., Mosbech, A., Reiertsen, T. K., Robertson, G. J., Steen, H., Strøm, H. & Thórarinsson, T. L., 1 Aug 2016, In : Biological Conservation. 200, p. 26-35 10 p.

Why is the last Thick-billed Murre Uria lomvia colony in central West Greenland heading for extinction?

Merkel, F. R., Boertmann, D., Falk, K., Frederiksen, M., Johansen, K. L., Lage Labansen, A., Linnebjerg, J. F., Mosbech, A. & Sonne, C., 11 May 2016, In : Bird Conservation International. 26, p. 177 191 p.

Status of Greenland Populations of Great Black-Backed Gull (Larus marinus), Lesser Black-Backed Gull (Larus fuscus) and Herring Gull (Larus argentatus)

Boertmann, D. & Frederiksen, M., 1 Apr 2016, In : Waterbirds. 39, sp1, p. 29-35 7 p.

Climate change and marine top predators

Frederiksen, M. (ed.) & Haug, T. (ed.), 18 Jan 2016, Lausanne: Frontiers Media. 180 p.

Editorial: climate change and marine top predators

Frederiksen, M. & Haug, T., 2 Dec 2015, In : Frontiers in Ecology and Evolution. 3, 3 p., 136.

Foraging ecology of three sympatric breeding alcids in a declining colony in Southwest Greenland

Linnebjerg, J. F., Reuleaux, A., Mouritsen, K. N. & Frederiksen, M., 23 Jun 2015, In : Waterbirds. 38, 2, p. 143-152 10 p.

Measuring neck collar loss of Pink-footed Geese Anser brachyrhynchus

Clausen, K. K., Frederiksen, M. & Madsen, J., 2015, In : Bird Study. 62, 1, p. 137-140 4 p.

Identifying links between vital rates and environment: A toolbox for the applied ecologist

Frederiksen, M., Lebreton, J-D., Pradel, R., Choquet, R. & Gimenez, O., 1 Feb 2014, In : Journal of Applied Ecology. 51, 1, p. 71-81 11 p.

Connectivity between flyway populations of waterbirds: Assessment of rates of exchange, their causes and consequences

Madsen, J., Tjørnløv, R. S., Frederiksen, M., Mitchell, C. & Sigfússon, A. T., 2014, In : Journal of Applied Ecology. 51, p. 183-193 11 p.

Declining trends in the majority of Greenland's thick-billed murre (Uria lomvia) colonies 1981-2011

Merkel, F. R., Labansen, A. L., Boertmann, D. M., Mosbech, A., Egevang, C., Falk, K., Linnebjerg, J. F., Frederiksen, M. & Kampp, K., 2014, In : Polar Biology. 37, p. 1061-1071 11 p.

Inferring seabird activity budgets from leg-mounted time-depth recorders

Linnebjerg, J. F., Huffeldt, N. P., Falk, K., Merkel, F. R., Mosbech, A. & Frederiksen, M., 2014, In : Journal of Ornithology. 155, 1, p. 301-306 6 p.

Movements and survival of Lesser Snow Geese Chen caerulescens caerulescens wintering in two habitats along the Gulf Coast, Louisiana

Jónsson, J. E., Frederiksen, M. & Afton, A. D., 2014, In : Wildfowl. 64, p. 54-74 21 p.

Prey density in non-breeding areas affects adult survival of black-legged kittiwakes Rissa tridactyla

Reiertsen, T. K., Erikstad, K. E., Anker-Nilssen, T., Barrett, R. T., Boulinier, T., Frederiksen, M., González-Solís, J., Gremillet, D., Johns, D., Moe, B., Ponchon, A., Skern-Mauritzen, M., Sandvik, H. & Yoccoz, N. G., 2014, In : Marine Ecology - Progress Series. 509, p. 289-302 14 p.

Impacts of avian cholera on survival of Common Eiders Somateria mollissima in a Danish colony

Tjørnløv, R. S., Humaidan, J. & Frederiksen, M., 1 Jan 2013, In : Bird Study. 60, p. 321-326

Climate, copepods and seabirds in the boreal Northeast Atlantic - current state and future outlook

Frederiksen, M., Anker-Nilssen, T., Beaugrand, G. & Wanless, S., 2013, In : Global Change Biology. 19, p. 364-372

Sympatric Breeding Auks Shift between Dietary and Spatial Resource Partitioning across the Annual Cycle

Linnebjerg, J. F., Fort, J., Guilford, T., Reuleaux, A., Mosbech, A. & Frederiksen, M., 2013, In : PLOS ONE. 8, 8, p. e72987

Multicolony tracking reveals the winter distribution of a pelagic seabird on an ocean basin scale

Frederiksen, M., Moe, B., Daunt, F., Phillips, R. A., Barrett, R. T., Bogdanova, M. I., Boulinier, T., Chardine, J. W., Chastel, O., Chivers, L. S., Christensen-Dalsgaard, S., Clément-Chastel, C., Colhoun, K., Freeman, R., Gaston, A. J., González-Solís, J., Goutte, A., Grémillet, D., Guilford, T., Jensen, G. H., Krasnov, Y., Lorentsen, S-H., Mallory, M. L., Newell, M., Olsen, B., Shaw, D., Steen, H., Strøm, H., Systad, G. H., Thórarinsson, T. L. & Anker-Nilssen, T., 1 Jun 2012, In : Diversity and Distributions. 18, 6, p. 530-542 13 p.

Phenological trends and trophic mismatch across multiple levels of a North Sea pelagic food web

Burthe, S., Daunt, F., Butler, A., Elston, D. A., Frederiksen, M., Johns, D., Newell, M., Thackeray, S. J. & Wanless, S., 21 May 2012, In : Marine Ecology - Progress Series. 454, p. 119-133 15 p.

Research priorities for seabirds: improving conservation and management in the 21st century

Lewison, R., Oro, D., Godley, B. J., Underhill, L., Bearhop, S., Wilson, R. P., Ainley, D., Arcos, J. M., Boersma, P. D., Borboroglu, P. G., Boulinier, T., Frederiksen, M., Genovart, M., Gonzalez-Solis, J., Green, J. A., Gremillet, D., Hamer, K. C., Hilton, G. M., Hyrenbach, K. D., Martinez-Abrain, A., Montevecchi, W. A., Phillips, R. A., Ryan, P. G., Sagar, P., Sydeman, W. J., Wanless, S., Watanuki, Y., Weimerskirch, H. & Yorio, P., 2012, In : Endangered Species Research. 17, p. 93-121

Survival of breeders in a Danish Black-legged Kittiwake Rissa tridactyla colony: a capture-mark-recapture study

Lerche-Jørgensen, M., Pedersen, J. L. & Frederiksen, M., 2012, In : Seabird. 25, p. 14-21

Reproductive performance in three neighbouring Great Cormorant (Phalacrocorax carbo) colonies in sw Kattegat, Denmark

Bregnballe, T., Gregersen, J., Hénaux, V., Sterup, J. & Frederiksen, M., Nov 2011. 1 p.

Among-colony synchrony in the survival of Common Guillemots Uria aalge reflects shared wintering areas

Reynolds, T. J., Harris, M. P., King, R., Swann, R. L., Jardine, D. C., Frederiksen, M. & Wanless, S., 2011, In : Ibis. 153, p. 818-831

Environmental Impacts of Arctic oil development in a changing climate

Mosbech, A., Schiedek, D., Boertmann, D., Frederiksen, M. & Wegeberg, S., 2011, The Arctic as a Messenger for Global Processes: – Climate Change and Pollution. Jensen, L. M. & Madsen, J. (eds.). National Environmental Research Institute, Aarhus University, p. 51-52

Fluctuating breeding of Arctic terns (Sterna paradisaea) in arctic and high-arctic colonies in Greenland

Egevang, C. & Frederiksen, M., 2011, In : Waterbirds. 34, 1, p. 107-111

Mechanisms of long-term decline in size of lesser sandeels in the North Sea explored using a growth and phenology model

Frederiksen, M., Elston, D. A., Edwards, M., Mann, A. D. & Wanless, S., 2011, In : Marine Ecology - Progress Series. 432, p. 137-147

Appendix 1: Seabirds in the North East Atlantic: A review of status, trends and anthropogenic impact

Frederiksen, M., 2010, In : TemaNord. 587, p. 47-122

Between-winter emigration rates are linked to reproductive output in Greenland White-fronted Geese Anser albifrons flavirostris

Marchi, C., Sanz, I. F., Blot, E., Hansen, J., Walsh, A. J., Frederiksen, M. & Fox, A. D., 2010, In : Ibis. 152, 2, p. 410-413 4 p.

Seabirds in the North East Atlantic. Summary of status, trends and anthropogenic impact

Frederiksen, M., 2010, In : TemaNord. 587, p. 21-24

Trophic level asynchrony in rates of phenological change for marine, freshwater and terrestrial environments

Thackeray, S. J., Sparks, T. H., Frederiksen, M., Burthe, S., Bacon, P. J., Bell, J. R., Botham, M. S., Brereton, T. M., Bright, P. W., Carvalho, L., Clutton-Brock, T., Dawson, A., Edwards, M., Elliott, J. M., Harrington, R., Johns, D., Jones, I. D., Jones, J. T., Leech, D. J., Roy, D. B., Scott, W. A., Smith, M., Smithers, R. J., Winfield, I. J. & Wanless, S., 2010, In : Global Change Biology. 16, 12, p. 3304-3313

Environmental forcing on life history strategies: Evidence for multi-trophiclevel responses at ocean basin scales

Suryan, R. M., Saba, V. S., Wallace, B. P., Hatch, S. A., Frederiksen, M. & Wanless, S., 2009, In : Progress in Oceanography. 81, p. 214-222

Integrated data analysis in the presence of emigration and mark loss

Reynolds, T. J., King, R., Harwood, J., Frederiksen, M., Harris, M. P. & Wanless, S., 2009, In : Journal of Agricultural, Biological, and Environmental Statistics. 14, 4, p. 411-431

Long-term changes in breeding phenology at two seabird colonies in the western North Sea

Wanless, S., Frederiksen, M., Walton, J. & Harris, M. P., 2009, In : Ibis. 151, 2, p. 274-285

Pros and cons of using seabirds as ecological indicators

Durant, J. M., Hjermann, D. Ø., Frederiksen, M., Charrassin, J. B., Le Maho, Y., Sabarros, P. S., Crawford, R. J. M. & Stenseth, N. C., 2009, In : Climate Research. 39, p. 115-129

Spatial distribution of seabirds in spring in the marginal ice zone off west Greenland

Frederiksen, M., Johansen, K. L., Boertmann, D., Wisz, M. & Mosbech, A., 2009.

Adult survival and breeding dispersal of Roseate Terns within the Northwest European metapopulation

Ratcliffe, N., Newton, S., Morrison, P., Merne, O., Cadwallender, T. & Frederiksen, M., 2008, In : Waterbirds. 31, 3, p. 320-329

Differential effects of a local industrial sand lance fishery on seabird breeding performance

Frederiksen, M., Jensen, H., Daunt, F., Mavor, R. A. & Wanless, S., 2008, In : Ecological Applications. 18, 3, p. 701-710

Later breeding in northern gannets in the eastern Atlantic

Wanless, S., Harris, M. P., Lewis, S., Frederiksen, M. & Murray, S., 2008, In : Marine Ecology - Progress Series. 370, p. 263-269

Reproductive Senescence in a Long-Lived Seabird: Rates of Decline in Late-Life Performance Are Associated with Varying Costs of Early Reproduction

Reed, T. E., Kruuk, L. E. B., Wanless, S., Frederiksen, M., Cunningham, E. J. A. & Harris, M. P., 2008, In : American Naturalist. 171, 2, p. E89-E101

Seabirds as indicators of the marine environment

Parsons, M., Mitchell, I., Butler, A., Ratcliffe, N., Frederiksen, M., Foster, S. & Reid, J. B., 2008, In : I C E S Journal of Marine Science. 65, p. 1520-1526

The demographic impact of extreme events: stochastic weather drives survival and population dynamics in a long-lived seabird

Frederiksen, M., Daunt, F., Harris, M. P. & Wanless, S., 2008, In : Journal of Animal Ecology. 77, p. 1020-1029

Black-legged kittiwakes as indicators of environmental change in the North Sea: evidence from long-term studies

Wanless, S., Frederiksen, M., Daunt, F., Scott, B. E. & Harris, M. P., 2007, In : Progress in Oceanography. 72, p. 30-38

Contrasting responses of migration strategies in two European thrushes to climate change

Rivalan, P., Frederiksen, M., Loïs, G. & Julliard, R., 2007, In : Global Change Biology. 13, p. 275-287

Regional and annual variation in black-legged kittiwake breeding productivity is related to sea surface temperature

Frederiksen, M., Edwards, M., Mavor, R. A. & Wanless, S., 2007, In : Marine Ecology - Progress Series. 350, p. 137-143

Regional variation in the role of bottom-up and top-down processes in controlling sandeel abundance in the North Sea

Frederiksen, M., Furness, R. W. & Wanless, S., 2007, In : Marine Ecology - Progress Series. 337, p. 279-286

Seabirds as environmental indicators: the advantages of combining data sets

Frederiksen, M., Mavor, R. A. & Wanless, S., 2007, In : Marine Ecology - Progress Series. 352, p. 205-211

Within- and between-year variation in the juvenile survival of common guillemots Uria aalge

Harris, M. P., Frederiksen, M. & Wanless, S., 2007, In : Ibis. 149, p. 472-481

Effects of distance to wintering area on arrival date and breeding performance in Great Cormorants Phalacrocorax carbo

Bregnballe, T., Frederiksen, M. & Gregersen, J., 2006, In : Ardea. 94, 3, p. 619-630

From plankton to top predators: bottom-up control of a marine food web across fout trophic levels

Frederiksen, M., Edwards, M., Richardson, A. J., Halliday, N. C. & Wanless, S., 2006, In : Journal of Animal Ecology. 75, p. 1259-1268

Net-entrapment of great cormorants Phalacrocorax carbo sinensis in relation to individual age and population size

Bregnballe, T. & Frederiksen, M., 2006, In : Wildlife Biology. 12, 2, p. 143-150

Recruitment to a seabird population depends on environmental factors and on population size

Crespin, L., Harris, M. P., Lebreton, J-D., Frederiksen, M. & Wanless, S., 2006, In : Journal of Animal Ecology. 75, p. 228-238

Responding to environmental change: plastic responses vary little in a synchronous breeder

Reed, T. E., Wanless, S., Harris, M. P., Frederiksen, M., Kruuk, L. E. B. & Cunningham, E. J. A., 2006, In : Royal Society of London. Proceedings. Biological Sciences. 273, p. 2713-2719

Survival of gannets Morus bassanus in Britain and Ireland, 1959-2002

Wanless, S., Frederiksen, M., Harris, M. P. & Freeman, S. N., 2006, In : Bird Study. 53, p. 79-85

Inter-population variation in demographic parameters: a neglected subject?

Frederiksen, M., Harris, M. P. & Wanless, S., 2005, In : Oikos. 111, p. 209-214

Regional patterns of kittiwake Rissa tridactyla breeding success are related to variability in sandeel recruitment

Frederiksen, M., Wright, P. J., Harris, M. P., Mavor, R. A., Heubeck, M. & Wanless, S., 2005, In : Marine Ecology - Progress Series. 300, p. 201-211

Within-winter movements and site fidelity of Icelandic greylag geese Anser anser

Swann, B. R. L. ., Brockway, I. K., Frederiksen, M., Hearn, R. D., Mitchell, C. & Sigfússon, A., 2005, In : Bird Study. 52, p. 25-36

Estimating true age-dependence in survival when only adults can be observed: an example with black-legged kittiwakes

Frederiksen, M., Wanless, S. & Harris, M. P., 2004, In : Animal Biodiversity and Conservation. 27, p. 541-548

Scale-dependent climate signals drive breeding phenology of three seabird species

Frederiksen, M., Harris, M. P., Daunt, F., Rothery, P. & Wanless, S., 2004, In : Global Change Biology. 10, p. 1214-1221

The dynamics of hunted Icelandic goose populations: a reassessment of the evidence

Frederiksen, M., Hearn, R. D., Mitchell, C., Sigfússon, A., Swann, R. L. & Fox, A. D., 2004, In : Journal of Applied Ecology. 41, 2, p. 315-334

The role of industrial fisheries and oceanographic change in the decline of North Sea black-legged kittiwakes

Frederiksen, M., Wanless, S., Harris, M. P., Rothery, P. & Wilson, L. J., 2004, In : Journal of Applied Ecology. 41, p. 1129-1139

Annual survival and site-fidelity of breeding female Common Scoter Melanitta nigra at Mývatn, Iceland, 1925-58

Fox, A. D., Petersen, Æ. & Frederiksen, M., 2003, In : Ibis. 145, 2, p. E94-E96

Estimating turnover at a staging site : how many Great Cormorants Phalacrocorax carbo sinensis used the Lake Geneva roost in autumn 1987?

Frederiksen, M., Bregnballe, T. & Reymond, A., 2003, In : Vogelwelt. 124, suppl., p. 123-125

Modelling the effect of winter culls on Great Cormorant Phalacrocorax carbo sinensis population size in Europe: the importance of spatial variability in culling intensity

Frederiksen, M., Lebreton, J-D. & Bregnballe, T., 2003, In : Vogelwelt. 124, suppl., p. 325-330

Indirect estimation of the number of migratory greylag and pink-footed geese shot in Britain

Frederiksen, M., 2002, In : Wildfowl. 53, p. 27-34

Site Fidelity of Wintering Cormorants Phalacrocorax carbo sinensis in Europe

Frederiksen, M., Bregnballe, T., van Eerden, M. R., van Rijn, S. & Lebreton, J-D., 2002, In : Wildlife Biology. 8, p. 241-250

Trends in Annual and Seasonal Survival of Pink-Footed Geese (Anser brachyrhynchus)

Madsen, J., Frederiksen, M. & Ganter, B., 2002, In : Ibis. 144, 2, p. 218-226

Comment on Schwarz and Arnason: Estimation of Age-Specific Breeding Probabilities from Capture-Recapture Data

Frederiksen, M. & Pradel, R., 2001, In : Biometrics. 57, 3, p. 975-975

Conspecific Reproductive Success Affects Age of Recruitment in a Great Cormorant, Phalacrocorax carbo sinensis, Colony

Frederiksen, M. & Bregnballe, T., 2001, In : Royal Society of London. Proceedings. Biological Sciences. 268, 1475, p. 1519-1526

Estimating the Total Number of Birds Using a Staging Site

Frederiksen, M., Fox, A. D., Madsen, J. & Colhoun, K., 2001, In : Journal of Wildlife Management. 65, p. 282-289

Estimation of total numbers of pied avocets Recurvirostra avosetta using a moulting site in the Danish Wadden Sea

Hötker, H. & Frederiksen, M., 2001, In : Ardea. 89, p. 537-541

Seasonal and Annual Survival of East-Atlantic Pale-Bellied Brent Geese Branta hrota Assessed by Capture-Recapture Analysis

Clausen, P., Frederiksen, M., Percival, S. M., Anderson, G. Q. A. & Denny, M. J. H., 2001, In : Ardea. 89, special issue, p. 101-112

The Interplay between Culling and Density-dependence in the Great Cormorant : a Modelling Approach

Frederiksen, M., Lebreton, J-D. & Bregnballe, T., 2001, In : Journal of Applied Ecology. 38, 3, p. 617-627

Diagnosing a Decline in Return Rate of 1-Year-Old Cormorants: Mortality, Emigration or Delayed Return?

Frederiksen, M. & Bregnballe, T., 2000, In : Journal of Animal Ecology. 69, p. 753-761

Evidence for Density-Dependent Survival in Adult Cormorants from a Combined Analysis of Recoveries and Resightings

Frederiksen, M. & Bregnballe, T., 2000, In : Journal of Animal Ecology. 69, p. 737-752

The importance of natal dispersal in a colonial seabird, the black guillemot Cepphus grylle

Frederiksen, M. & Petersen, A., 2000, In : Ibis. 142, p. 48-57

Adult survival of the black guillemot in Iceland

Frederiksen, M. & Petersen, A., 1999, In : Condor. 101, p. 589-597

Philopatry and dispersal within a black guillemot colony

Frederiksen, M. & Petersen, A., 1999, In : Waterbirds. 22, p. 274-281

Seasonal Distribution and Timing of Migration of Cormorants Phalacrocorax carbo sinensis Breeding in Denmark

Bregnballe, T., Frederiksen, M. & Gregersen, J., 1997, In : Bird Study. 44, p. 257-276