| Remote sensing image data and automated analysis to describe marine bird distributions and abundances G Groom, M Stjernholm, RD Nielsen, A Fleetwood, IK Petersen Ecological Informatics 14, 2-8, 2013 | 70 | 2013 |
| Abundance of whales in West and East Greenland in summer 2015 RG Hansen, TK Boye, RS Larsen, NH Nielsen, O Tervo, RD Nielsen, ... BioRxiv, 391680, 2018 | 38 | 2018 |
| Climate‐change not only threatens bird populations but also challenges our ability to monitor them. AD Fox, RSD Nielsen, IK Petersen Ibis 161 (2), 2019 | 27 | 2019 |
| Post-construction evaluation of bird abundances and distributions in the Horns Rev 2 offshore wind farm area, 2011 and 2012 IK Petersen, RD Nielsen, ML Mackenzie | 25 | 2014 |
| Seabirds and marine mammals in northeast Greenland D Boertmann, K Olsen, RD Nielsen NERI Technical report 721, 2009 | 15 | 2009 |
| Geese, seabirds and mammals in North and Northeast Greenland. Aerial surveys in summer 2009 D Boertmann, RD Nielsen National Environmental Research Institute, Aarhus University, 2010 | 14 | 2010 |
| Wintering seabirds in south-west Greenland, 2017 FR Merkel, KL Johansen, RD Nielsen, IK Petersen, J Sterup, A Mosbech Polar Research, 2019 | 11 | 2019 |
| Geese in Northeast and North Greenland as recorded on aerial surveys in 2008 and 2009 D Boertmann, K Olsen, RD Nielsen Dansk Ornitologisk Forenings Tidsskrift 109 (4), 206-17, 2015 | 9 | 2015 |
| Abundance and distribution of selected waterbird species in Danish marine areas IK Petersen, RD Nielsen Aarhus: National Environmental Research Institute, 2011 | 9 | 2011 |
| Landsdækkende optælling af vandfugle i Danmark, vinteren 2007/2008 IK Petersen, RD Nielsen, S Pihl, P Clausen, OR Therkildsen, ... Danmarks Miljøundersøgelser, Aarhus Universitet, 2010 | 9 | 2010 |
| Rastende fugle i det danske reservatnetværk 1994-2010: Del 2: De enkelte reservater P Clausen, TE Holm, OR Therkildsen, HE Jørgensen, RD Nielsen Aarhus Universitet, DCE-Nationalt Center for Miljø og Energi, 2014 | 6 | 2014 |
| Fugle 2004-2011: NOVANA S Pihl, P Clausen, IK Petersen, RD Nielsen, K Laursen, T Bregnballe, ... Aarhus Universitet, DCE-Nationalt Center for Miljø og Energi, 2013 | 6 | 2013 |
| A bowhead whale calf observed in northeast Greenland waters D Boertmann, RD Nielsen Polar Record 46 (4), 373-375, 2010 | 5 | 2010 |
| Fordeling af vandorienterede friluftsaktiviteter og vandfugle i Danmark K Laursen, BC Kaae, J Bladt, H Skov-Petersen, JK Rømer, P Clausen, ... | 3 | 2016 |
| LANDSDÆKKENDE OPTÆLLINGER AF VANDFUGLE I DANMARK IK Petersen, RD Nielsen | 3 | 2010 |
| Forstyrrelser af vandfugle ved friluftsaktiviteter tilknyttet marine og ferske vande–en oversigt (With a summary in English: Disturbance of waterbirds by water-based … K Laursen, T Bregnballe, OR Therkildsen, TE Holm, RD Nielsen Dansk Ornitologisk Forenings Tidsskrift 111 (3), 96-112, 2017 | 2 | 2017 |
| Relationen mellem den geografiske fordeling af fældende havdykænder og menneskelige aktiviteter i Sejerøbugten IK Petersen, RD Nielsen, O Therkildsen, J Kotzerka, AB Madsen, ... Sommeren, 2014 | 2 | 2014 |
| Impacts of predation on the hatching success of Northern Lapwings Vanellus vanellus in relation to Red Fox Vulpes vulpes density RD Nielsen Master Thesis, Aarhus University, Department of Bioscience, 2008 | 2 | 2008 |
| Comparison of Key Concepts between The Netherlands and Denmark RD Nielsen, TK Christensen, H Heldbjerg, J Fredshavn Aarhus: Research note from DCE–Danish Centre for Environment and Energy …, 2019 | 1 | 2019 |
| Opdatering af danske fugles yngle-og forårstræktider (key concepts) 2018 RD Nielsen, TK Christensen, KK Clausen, J Madsen, P Clausen, AD Fox, ... DCE-Nationalt Center for Miljø og Energi, 2019 | | 2019 |
