| The design of artificial nestboxes for the study of secondary hole-nesting birds: a review of methodological inconsistencies and potential biases MM Lambrechts, F Adriaensen, DR Ardia, AV Artemyev, F Atiénzar, ... Acta Ornithologica 45 (1), 1-26, 2010 | 370 | 2010 |
| Diet of the insectivorous bat Pipistrellus nathusii during autumn migration and summer residence F Krüger, EL Clare, WOC Symondson, O Keišs, G Pētersons Molecular Ecology 23 (15), 3672-3683, 2014 | 75 | 2014 |
| The insectivorous bat Pipistrellus nathusii uses a mixed-fuel strategy to power autumn migration CC Voigt, K Sörgel, J Šuba, O Keišs, G Pētersons Proceedings of the Royal Society B: Biological Sciences 279 (1743), 3772-3778, 2012 | 75 | 2012 |
| Prevalence of tick-borne pathogens in ticks collected from migratory birds in Latvia V Capligina, I Salmane, O Keišs, K Vilks, K Japina, V Baumanis, R Ranka Ticks and tick-borne diseases 5 (1), 75-81, 2014 | 71 | 2014 |
| Substantial decline of Northern European peatland bird populations: Consequences of drainage S Fraixedas, A Lindén, K Meller, Å Lindström, O Keišs, JA Kålås, M Husby, ... Biological conservation 214, 223-232, 2017 | 65 | 2017 |
| Detection of tick-borne encephalitis virus in I. ricinus ticks collected from autumn migratory birds in Latvia A Kazarina, K Japiņa, O Keišs, I Salmane, D Bandere, V Capligina, ... Ticks and Tick-Borne Diseases 6 (2), 178-180, 2015 | 32 | 2015 |
| Impact of changes in agricultural land use on the Corncrake Crex crex population in Latvia O Keišs Acta Universitatis Latviensis 691, 93-109, 2005 | 32 | 2005 |
| Recent increases in numbers and the future of Corncrake Crex crex in Latvia O Keišs Ornis Hungarica 12 (13), 151-156, 2003 | 31 | 2003 |
| Recent population status and trends of Corncrakes Crex crex in Europe K Koffijberg, CA Hallmann, O Keiss, N Schäffer | 20 | 2016 |
| Continental‐scale patterns of pathogen prevalence: a case study on the corncrake Y Fourcade, O Keišs, DS Richardson, J Secondi Evolutionary applications 7 (9), 1043-1055, 2014 | 19 | 2014 |
| Corncrake conservation genetics at a European scale: the impact of biogeographical and anthropological processes Y Fourcade, DS Richardson, O Keišs, M Budka, RE Green, S Fokin, ... Biological Conservation 198, 210-219, 2016 | 17 | 2016 |
| Extracting historical population trends using archival ringing data—an example: the globally threatened Aquatic Warbler M Briedis, O Keišs Journal of Ornithology 157, 419-425, 2016 | 17 | 2016 |
| Results of a survey of Corncrake Crex crex in Latvia, 1989-1995 O Keišs Bird, 73-76, 2004 | 14 | 2004 |
| Onset of breeding in Tawny Owl Strix aluco in eastern Latvia G Grandāns, O Keišs, A Avotiņš Acta Universitatis Latviensis 753, 81-87, 2009 | 12 | 2009 |
| Use of biometrical data to study Corncrake Crex crex population in Latvia O Keiss, J Granats, A Mednis Acta Univ. Latv. Biol 676, 119-126, 2004 | 12 | 2004 |
| Results of a randomised Corncrake Crex crex survey in Latvia 1996: population estimate and habitat selection O Keišs Die Vogelwelt 118, 231-235, 1997 | 12 | 1997 |
| Migration strategies, performance and annual activity budget in a short‐distance migrant, the common starling Sturnus vulgaris V Vīgants, O Keišs, I Dinsbergs, V Jaunzemis, EM Zacmane, A Priedniece, ... Journal of Avian Biology 2023 (5-6), e03080, 2023 | 10 | 2023 |
| Mammalian predator distribution and abundance on the Virginia barrier islands in relation to breeding habitats of colonial birds O Keiss Utah State University, 2001 | 9 | 2001 |
| Method for identification of avian species by eggshell microstructure: Preliminary study A Bušs, O Keišs Acta Univ Latv 753, 89-98, 2009 | 8 | 2009 |
| Overwater movement of raccoons (Procyon lotor) in a naturally fragmented coastal landscape RD Dueser, ND Moncrief, O Keišs, JD Martin, JH Porter, BR Truitt Northeastern Naturalist 20 (3), 511-528, 2013 | 7 | 2013 |
