Tomasz Osiejuk

Head of Dept

Tomasz S. Osiejuk, Ph.D.

Phone: +48 61 829 5706

Evolution of acoustic communication in animals, trade offs between design and function of acoustic signals, organization of song variation in birds, conventional signalling. Species of interest: buntings, especially Emberiza hortulana, E. citrinella, E. calandra; Corncrake Crex crex. I also participated in research on pipits (Anthus trivialis and A. campestris), skylark (Alauda arvensis), Double-collared Northern Sunbird (Cinnyris reichenowi), and some warblers: Acrocephalus paludicola and A. arundinaceus.

Journal of Ornithology - Subject editor in bioacoustics - 2019 - on going
Animal Behaviour Editor - 2014-2016
Titular professor - 2009;
Habilitation in biology - 2004; Postdocs: Cornell Lab of Ornithology (prof. Sandra Vehrencamp) - 2004-05, Universite Paris Sud (prof. Thierry Aubin) - 2005 Ph.D. in ecology - 1998; M.Sc. in biology - 1993;
Employment 1998- Adam Mickiewicz University (1999 - Assistant Professor, 2005 - Associate Professor, 2010 - Full Professor); 1993 - Lubusian Club of Naturalist (biologist); 1991-92 - Polish Academy of Sciences, Institute of Ecology (biologist)

Lectures in: Bioacoustics, Signals and animal communication, Methodology of science and methods in natural history, Behavioural Ecology. Head of Faculty of Biology Ph.D. Studies (2005-08).
Vice Director (scientific issues) of Institute of Environmental Biology (2008-12, 2012-16)

(1) Acoustic communication of the ortolan bunting (Emberiza hortulana): communication networks, individual recognition, function(s) and maintenance of dialects, function of soft song.
(2) Functions of duetting in yellow-breasted boubou (Laniards atroflavus) an endemic species from Cameroon
(3) Bioacoustics assessement of avian biodiversity in Cameroon mountain rainforests
(4) Trade-off between species recognition and individual discrimination in tropical Turtur doves

• Member of Association for the Study Animal Behaviour, American Ornithologists Union, Cooper Ornithological Society, Polish Zoological Society
• Member of Editorial Board of Acta Ornithologica, Animal Behaviour, Communicative & Integrative Biology, The Open Ornithology Journal, Dataset Papers in Biology, Advances in Ecology.
• Minister of National Education Award 1990, 1992
• Foundation for the Polish Science Award for the Young Scientists (1999)
• Foreign Scholarship of the Foundation for Polish Science (2004)
• Member of European Ornithologists Union Council (2005-07)
• Member of Polish Academy of Sciences: Committee of Theoretical and Evolutionary Biology (2007-10, 2011-14, 2015-19) and Committee of Zoology (2007-10, 2011-14, 2015-19), Committee of Ecology (2011-14, 2015-19)
• 2008 - 1st class Team Award of the Rector of Adam Mickiewicz University for the scientific achievements in 2007
• 2011 - 1st class Team Award of the Rector of Adam Mickiewicz University for the scientific achievements in 2010
• 2012 - 2nd class Team Award of the Rector of Adam Mickiewicz University for the scientific achievements in 2011
• 2012 - Annual Award of Polish Academy of Sciences (for research on aggressive communication in corncrake)
• 2014 - 3nd class Team Award of the Rector of Adam Mickiewicz University for the scientific achievements in 2013
• 2015 - 3nd class Team Award of the Rector of Adam Mickiewicz University for the scientific achievements in 2014
• 2020 - 1st class Team Award of the Rector of Adam Mickiewicz University for the scientific achievements in 2019
• 2011, 2012, 2014, 2019, 2020 - Award of the Rector of Adam Mickiewicz University for the most efficiently publishing professors

The Auk, Acta Ornithologica, Acta Theriologica, Animal Cognition, Animal Behaviour, American Naturalist, Avian Research, Behavioral Ecology, Behavioral Ecology and Sociobiology, Behavioural Processes, Bioacoustics, Behaviour, Biologia, Biological Journal of Linnean Society, Biological Letters, Biology Letters, Ecological Informatics, Entropy, Ethology, Ethology Ecology and Evolution, Frontiers in Zoology, Folia Zoologica, Ibis, Integrative Zoology, Journal of Animal Ecology, Journal of Avian Biology, Journal of Biogeography, Journal of Biology and Nature, Journal of Ethology, Journal of Natural History, Journal of Ornithology, Journal of theoretical Biology, Kulon, Naturwissenchaften, Northwestern Naturalist, Polish Journal of Ecology, Ornis Fennica, Ornithological Science, Scientific Reports, Sylvia, The Open Ornithology Journal, Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego.

National Science Centre, Poland; Foundation for the Polish Science, Poland; Ministry of Science and Higher Education, Poland; Netherlands Organization for Scientific Research, Netherlands; Fulbright Scholar Program, USA; Marsden Fund, New Zealand; National Science Foundation, USA

SELECTED PAPERS (PDFs for download are here)
Poignet M, Pokorná MJ, Altmanová M, Majtánová Z, Dedukh D, Albrecht T, Reif J, Osiejuk TS, Reifová R (2021) Comparison of karyotypes in two hybridizing passerine species: conserved chromosomal structure, but divergence in centromeric repeats. Frontiers in Genetics 12:768987. DOI: 10.3389/fgene.2021.768987
Budka, M., Kułaga, K., Osiejuk, T. (2021) Evaluation of accuracy and precision of the sound-recorder point-counts applied in forest and open areas in two locations situated in a temperate and tropical regions. Birds 2:351-361. DOI: 10.3390/birds2040026
Wheeldon A, Szymański P, Surmacki A, Osiejuk TS. (2021) Song type and song type matching are important for joint territorial defense in a duetting songbird. Behavioral Ecology 32:883-894. DOI: 10.1093/behaeco/arab030
Sottas, C., Schmiedová, L., Kreisinger, J., Albrecht, T., Reif, J., Osiejuk, T.S., Reifová, R. (2021) Gut microbiota in two recently diverged passerine species: evaluating the effects of species identity, habitat use and geographic distance. BMC Ecology and Evolution 21:41. DOI: 10.1186/s12862-021-01773-1
Szymański P, Olszowiak K, Wheeldon A, Budka M, Osiejuk TS. (2021) Passive acoustic monitoring gives new insight into year-round duetting behaviour in a tropical songbird. Ecological Indicators
Wheeldon, A, Szymański, P., Osiejuk, T.S. (2020) Yellow-breasted Boubous (Laniarius atroflavus) jointly defend territories with male led duets against stranger pairs, males and females. Ethology, DOI: 10.1111/eth.13116.
Budka, M., Skierczyńska, A., Antczak, M., Osiejuk, T.S. () Nocturnal singing by diurnal birds in Afrotropical highlands. Journal of Ornithology, accepted.
Wheeldon, A., Szymański, P., Budka, M., Osiejuk, T.S. (2020) Structure and functions of Yellow-breasted Boubou (Laniarius atroflavus) solos and duets. PeerJ 8:e10214 DOI: 10.7717/peerj.10214
Budka M., Czyż M., Skierczyńska A., Skierczyński M., Osiejuk TS. (2020) Duration of survey changes interpretation of habitat preferences study - an example of an endemic tropical songbird - the Bangwa forest warbler. Ostrich 91(3):195-203. DOI: 10.2989/00306525.2020.1723139
Sottas C., Reif J., Kreinsinger J., Schmiedová L., Sam K., Osiejuk T.S., Reifová R. (2020) Tracing early steps of competition-driven eco-morphological divergence in two sister species of passerines. Evolutionary Ecology 34: 501-524. DOI 10.1007/s10682-020-10050-4
Deoniziak, K., Osiejuk, T.S. (2020) Song-type switching rate in the chaffinch carries a message during simulated intrusion. Behavioral Ecology and Sociobiology 74: 47. DOI: 10.1007/s00265-020-2825-2
Deoniziak, K., Osiejuk, T.S. (2019) Habitat-related differences in song structure and complexity in a songbird with a large repertoire. BMC Ecology 19:40 DOI: 10.1186/s12898-01909255-7
Linhart, P., Osiejuk, T.S., Budka, M., Salek, M., Spinka, M., Policht, R., Syrova, M., Blumstein, D.T. (2019) Measuring individual identity information in animal signals: overview and performance of available identity metrics. Methods in Ecology and Evolution 10: 1558-1570.
Osiejuk, T., Łosak, K., Steifetten, Ø., Dale, S. (2019) Songbird presumed to be age-limited learner may change repertoire size and composition throghout their life. Journal of Zoology 309: 231-240. DOI: 10.1111/jzo.12717
Osiejuk, T.S., Żbikowski, B., Wheeldon, A., Budka, M. (2019) Hey Mister Tambourine Dove, sing a song for me: simple but individually specific songs of Turtur tympanistria from Cameroon. Avian Research 10: 14. DOI: 10.1186/s40657-019-0153-x
Jakubowska, A., Osiejuk, T.S. (2019) The use of soft songs during territorial intrusion in alarm context in the ortolan bunting Emberiza hortulana. Journal of Ornithology160: 207-216.
Jakubowska, A., Osiejuk, T.S. (2018) Sing softly to evoke a response only from a recent intruder. Behavioural Processes 157: 244-249.
Turcokova, L., Chutny, B., Pavel, V., Svoboda, A., Osiejuk, T.S. (2018) Older is better? Age-related variation in ornamental and breeding traits in bluethroats, Luscinia s. svecica. Folia Zoologica 67, DOI: 10.25225/fozo.v67.i2.a2.2018.
Tryjanowski, P., Morelli, F., Osiejuk, T.S., Moller, A.P. (2018) Functional significance of cuckoo Cucuculs caners calls: responses of conspecifics, hosts and non-hosts. PeerJ 6:e5302.
Perez-Granados, C., Osiejuk, T.S., Lopez-Iborra, G.M. (2018) Dawn chorus interpretation differs when considering songs or calls: the case of Dupont's Lark Chersophilus duponti. PeerJ 6:e5241.
Niedbała, W., Osiejuk, T.S. (2018) Further new and little known species of ptyctimous mites (Acari, Oribatida) from Cameroon. Turkish Journal of Zoology accepted.
Jakubowska, A., Osiejuk, T.S. (2018) Soft songs in male ortolan buntings are used in an aggressive context but are not an aggressive signal. Ethology 124: 549-558.
Wojas, L., Podkowa, P., Osiejuk, T.S. (2018). Nocturnal rail with a simple territorial call eavesdrops on interactions between rivals. PLOS ONE 13(5):e0197368
Rosin, Z.M., Kwieciński, Z., Lesicki, A., Skórka, P., Kobak, J., Szymańska, A., Osiejuk, T.S., Kałuski, T., Jaskulska, M., Tryjanowski, P. (2018) Shell colour, temperature, (micro)habitat structure and predator pressure affect behavior of Cepaea nemoralis. The Science of Nature 105:35.
Szymański, P., Deoniziak, K., Łosak, K., Osiejuk, T.S. (2017) The song of Eurasian Skylark Alauda arvensis indicates a deterioration of an acoustic environment resulting from wind farm start-up. Ibis 159: 769-777.
Jakubowska, A., Osiejuk, T.S. (2017) Song duration mediates responses of territory owner in a songbird species with a small song repertoire. Acta Ethologica 20: 137-145.
Budka, M., Osiejuk, T.S. (2017) Microgeographic call variation in a non-learning species, the Corncrake (Crex crex). Journal of Ornithology 158: 651-658.
Osiejuk, T.S. (2016) The biology of democracy. Can millions of flies be wrong? In: Universal values in academic discourse (Ed. Gulczyński, A),UAM Scientific Press. pp. 139-157 (book chapter).
Deoniziak, K., Osiejuk, T.S. (2016) Disentangling relationships between repertoire size, song rate, signal redundancy, and ambient noise level. Ethology 122: 734-744.
Pérez-Granados, C., Osiejuk, T.S., López-Iborra, G.M. (2016) Habitat fragmentation effect effects and variations in repertoire size and song sharing degree among Dupont’s lark Chersophilus duponti populations. Journal of Ornithology 157: 471-482.
Jakubowska, A., Łosak, K., Osiejuk, T.S. (2015) Nietypowo śpiewające ortolany Emberiza hortulana w Wielkopolsce Ornis Polonica 56: 328-338.
Osiejuk, T.S. (2015) Ortolan Emberiza hortulana.W: Chylarecki, P., Sikora, A., Cenian, Z., Chodkiewicz, T. (red)., Monitoring ptaków lęgowych. Poradnik metodyczny. Wydanie 2. GIOŚ, Warszawa, s. 579-583.
Reino, J., Porto, M., Santana, J., Osiejuk, T.S. (2015) Influence of moonlight on nightjars’ vocal acitivity: a guideline for nightjar surveys in Europe. Biologia 70: 968-973.
Helfer, B., Osiejuk T.S. (2015) It takes all kinds in acoustic communication: a new perspective on the song overlapping phenomenon. Ethology 121: 315-326.
Budka, M., Wojas, L., Osiejuk T.S. (2015) Is it possible to acoustically identify individuals within a population? Journal of Ornithology 156: 481-488. DOI: 10.1007s/s10336-014-1149-2
Budka, M., Osiejuk T.S. (2014) Individually specific call feature is not used to neighbour-stranger discrimination: the corncrake case. PLoS ONE 9(8):e104031. DOI: 10.1371/journal.pone.0104031
Grzywaczewski, G., Osiejuk, T.S., Cios, S., Marczakiewicz (2014) Song post selection in the aquatic warbler Acrocephalus paludicola. Annales Zoologici Fennici 51: 495-500.
Osiejuk, T.S. (2014) Differences in frequency of shared song types enables neighbour-stranger discrimination in a songbird species with small song repertoire. Ethology 120: 893-903.
Osiejuk, T.S., Wiśniewska, A. (2014) Dlaczego warto prowadzić badania w Kamerunie ? e-Wiadomości Ekologiczne Nr 1, marzec 2014, 12-18.
Budka, M., Mikkelsen, G., Turčoková, L., Fourcade, Y., Dale, S., Osiejuk, T.S. (2014) Macrogeographic variation in the call of the corncrake Crex crex. Journal of Avian Biology 45: 65-74.
Budka, M., Osiejuk, T.S. (2013) Formant frequencies are acoustic cues to caller discrimination and are a weak indicator of the body size of corncrake. Ethology 119: 960-969.
Mikkelsen, G., Dale, S., Holtskog, T., Budka, M., Osiejuk, T.S. (2013) Can individually characteristic calls be used to identify long-distance movements of Corncrakes Corncrake Crex crex? Journal of Ornithology 154: 751-760.
Budka, M., Osiejuk, T.S. (2013) Habitat preferences of Corncrake (Crex crex). males in agricultural meadows. Agriculture, Ecosystems and Environment 171: 33-38.
Budka, M., Osiejuk, T.S. (2013) Neighbour-stranger call discrimination in a nocturnal rail species, the Corncrake Crex crex. Journal of Ornithology 154: 685-694.
Ręk, P., Osiejuk, T.S. (2013) Temporal patterns of broadcast calls in the corncrake encode information arbitrarily. Behavioral Ecology 24: 547-552.
Trawicki, M.B., Johnson, M.T., Ji, A., Osiejuk, T.S. (2012) Multichannel speech recognition using distributed microphone signal fusion strategies. ICALIP 2012 - International Conference on Audio, Language and Image Processing, Proceedings 2012, art. no. 6376789, pp. 1146-1150.
Osiejuk, T.S. (2012) The meaning of animal acoustic signals and how biologists can understand their functions. SPA 2011 - Signal Processing: Algorithms, Aritechtures, Arrangements, and Applications - Conference Proceedings, art. no. 6190946, pp. 118-120.
Budka, M., Ręk, P., Osiejuk, T.S., Jurczak, K. (2012) Zagęszczenie samców derkacza Crex crex na wybranych powierzchniach w Polsce. Ornis Polonica 53: 165-174.
Osiejuk, T.S., Bielecka, A., Skierczyński, M. (2012) What exactly is ‚Local Song’ in a population of ortolan buntings with a common dialect? Journal of Ethology 30: 133-142.
Ręk, P., Osiejuk, T.S., Budka, M. (2011) Functionally similar acoustic signals in the corncrake (Crex crex) transmit information about different states of the sender during aggressive interactions. Hormones and Behavior 60: 706-712.
Osiejuk, T.S. (2011) Soft song and the readiness hypothesis: comments on Akçay et al. (2011). Animal Behaviour 82: e1-e3.
Ręk, P., Osiejuk, T.S. (2011) Non-passerine bird produces sof calls and pays retaliation cost. Behavioral Ecology 22: 657-662.
Ręk, P., Osiejuk, T.S. (2011) No male identity information loss during call propagation through dense vegetation: The case of the corncrake. Behavioural Processes 86: 323-328.
Osiejuk, T.S. (2011) The song of the cinnamon-breasted bunting, Emberiza tahapisi, in the Bamenda Highlands (NW Cameroon). Journal of Ornithology 152: 651-659.
Ręk, P., Osiejuk, T.S. (2010) Sophistication and simplicity: conventional communication in a rudimentary system. Behavioral Ecology 21: 1203-1210.
Turcokova, L., Osiejuk, T.S., Pavel, V., Glapan, J., Petruskova, T. (2010) Song divergence in two Bluethroat subspecies (Luscinia svecica svecica, L. s. cyanecula). Ornis Fennica 87: 168-179.
Węgrzyn, E., Leniowski, K., Osiejuk, T.S. (2010) Whistle duration and consistency reflect philopatry and harem size in great reed warblers. Animal Behaviour 79: 1363-1372.
Adi, K., Johnson, M.T., Osiejuk, T.S. (2010) Acoustic censusing using automatic vocalization classification and identity recognition. Journal of the Acoustical Society of America 127: 874-883.
Petruskova, T, Osiejuk, T.S., Petrusek, A. (2010) Geographical patterns and individual differences of song variation in tree pipit (Anthus trivialis). Auk 127: 274-282.
Skierczyński, M., Osiejuk, T.S. (2010) Sharing song types within local dialect does not hinder neighbour-stranger recognition in ortolan bunting Emberiza hortulana males. Behaviour 147: 333-351.
Briefer, E., Osiejuk, T.S., Rybak, F., Aubin, T. (2010) Are bird song complexity and sharing shaped by habitat structure? An information theory and statistical approach. Journal of theoretical Biology 262: 151-164.
Ren, Y., Johnson, M.T., Clemins, P., Darre, M., Glaeser, S.S., Osiejuk, T.S., Out-Nyarko, E. (2009) A framework for bioacoustic vocalization analysis using Hidden Markov Models. Algorithms 2: 1410-1428.
Węgrzyn, E., Leniowski, K., Osiejuk, T.S. (2009) Introduce yourself at the beginning – possible identification function of the initial part of the song in the Great Reed Warbler Acrocephalus arundinaceus. Ornis Fennica 86: 71-70.
Grzybek, J., Michalak, I., Osiejuk, T.S., Tryjanowski, P. (2008) Densities and habitats of the Tawny Pipit Anthus campestris in the Wielkopolska region (W Poland). Acta Ornithologica 43: 221-225.
Petrusková, T., Osiejuk, T.S., Linhart, P., Petrusek, A. (2008) Structure and complexity of perched and flight songs of the tree pipit (Anthus trivialis). Annales Zoologici Fennici 45: 135-148.
Tao, J., Johnson, M.T., Osiejuk, T.S. (2008) Acoustic model adaptation for ortolan bunting (Emberiza hortulana L.) song-type classification. Journal of the Acoustical Society of America 123: 1582-1590.
Borowiec, M., Łosak, K., Osiejuk, T.S., Halupka, K. (2007) Song repertoire is not affected by stress in an adult male songbird, the Whitethroat Sylvia communis. Behaviour 144: 879-887.
Osiejuk, T.S., Grzybek, J., Tryjanowski, P. (2007) Song structure and repertoire sharing in the Tawny Pipit Anthus campestris in Poland. Acta Ornithologica 42: 157-165.
Osiejuk, T.S., Kuczyński, L. (2007) Factors affecting flushing distance in incubating female greylag geese Anser anser. Wildlife Biology 13: 11-18.
Osiejuk, T.S., Ratyńska, K., Cygan, J.P. (2007) Corn bunting (Miliaria calandra) males respond differently to alternating and overlapping playback of song. Journal of Ethology 25: 159-168.
Osiejuk, T.S., Ratyńska, K., Dale, S. (2007) What makes a 'local song' in a population of ortolan buntings without a common dialect? Animal Behaviour 74:121-130.
Osiejuk, T.S., Łosak, K., Dale, S. (2007) Cautious response of inexperienced birds to conventional signal of stronger threat. Journal of Avian Biology 38: 644-649.
Skierczyński, M., Czarnecka, K.M., Osiejuk, T.S. (2007) Neighbour-stranger song discrimination in territorial ortolan bunting Emberiza hortulana males. Journal of Avian Biology 38: 415-420.
Dale, S., Steifetten, Ø., S. Osiejuk, T., Losak, K., P. Cygan, J. (2006) How do birds search for breeding areas at the landscape level? Interpatch movements of male ortolan buntings. Ecography 29: 886-898.
Osiejuk, T.S., Ratyńska, K., Cygan, J.P., Dale, S. (2005) Frequency shift in homologue syllables of the Ortolan Bunting Emberiza hortulana. Behavioural Processes 68: 69-83.
Trawicki, M.B., Johnson, M.T., Osiejuk, T.S. (2005) Automatic song-type classification and speaker identification of norwegian ortolan bunting (Emberiza hortulana) vocalizations. 2005 IEEE Workshop on Machine Learning for Signal Processing, art. no. 1532913, pp. 277-282.
Osiejuk, T.S. (2004) „Ona tylko przyszła po mikrofon“, czyli wstęp do bioakustyki ptaków. Notatki Ornitologiczne 45: 21-40.
Osiejuk, T.S., Ratyńska, K., Dale, S., Steifetten, Ø., Cygan, J.P. (2004) Ortolan Buntings Emberiza hortulana mimicking other species and other dialects of own species. Ornis Norvegica 27: 73-79.
Osiejuk, T.S., Olech, B. (2004) Amplitude spectra of Corncrake calls: what do they signalise? Animal Biology 54: 207-220.
Osiejuk, T.S., Olech, B., Ratyńska, K., Owsiński, A., Gromadzka-Ostrowska, J. (2004) Effects of season, plasma testosterone and body size on corncrake (Crex crex) call rhythm. Annales Zoologici Fennici 41: 647-659.
Rutkowska-Guz, J. M. & Osiejuk, T.S. (2004) Song structure and variation in Yellowhammers Emberiza citrinella from western Poland. Polish Journal of Ecology 52: 327-339.
Osiejuk, T.S., Ratyńska, K., Dale, S., Steifetten, Ø., Cygan, J.P. (2004) Ortolan Buntings Emberiza hortulana mimicking other species and other dialects of own species. Ornis Norvegica 27: 73-79.
Osiejuk, T.S., Ratyńska, K., Cygan, J.P. (2004) Signal value of alternating and overlapping singing in Yellowhammer Emberiza citrinella. Journal of Ethology 22: 55-61.
Olinkiewicz, A., Osiejuk, T.S. (2003) Effect of season time and neighbours on singing activity in the Corn Bunting Miliaria calandra. Acta Ornithologica 38: 117-122.
Osiejuk, T.S., Ratyńska, K. (2003) Song repertoire and microgeographic variation in song types distribution in the Corn Bunting Miliaria calandra from Poland. Folia Zoologica 52: 275-286.
Osiejuk, T.S., Kuczyński, L. (2003) Response to typical, shortened and mixed song variants in Eurasian Treecreeper (Certhia familiaris). Biologia, Bratislava 58: 985-989.
Osiejuk, T.S., Ratyńska, K., Cygan, J.P., Dale, S. (2003) Ortolan Bunting Emberiza hortulana singing like Yellowhammer E. citrinella. Ornis Fennica 80: 38-42.
Osiejuk, T.S., Ratyńska, K., Cygan, J.P., Dale, S. (2003) Song structure and repertoire variation in Ortolan Bunting (Emberiza hortulana L.) from isolated Norwegian population. Annales Zoologici Fennici 40: 3-16.
Osiejuk, T.S. (2001) Repertoire and temporal organization of song bouts in the Yellowhammer (Emberiza citrinella) from western Poland. In: Tryjanowski, P., Osiejuk, T.S., Kupczyk, M. (eds). Bunting Studies in Europe, Pp. 71-79.
Kuczyński, L., Engel, J. & Osiejuk, T.S. (2001) Przemieszczenia samic kaczki krzyżówki Anas platyrhynchos L. w okresie wodzenia młodych i pierzenia. Roczniki Naukowe Polskiego Towarzystwa Ochrony Przyrody “Salamandra” 5: 97-110.
Osiejuk, T.S., Kuczyński, L. (2000) Mixed and atypical singers among treecreepers Certhia brachydactyla and C. familiaris: a review and preliminary data from western Poland. Biological Bulletin of Poznań 37: 83-94.
Osiejuk, T.S., Kuczyński, L. (2000) Song functions and territoriality in Eurasian Treecreeper Certhia familiaris and Short-toed Treecreeper Certhia brachydactyla. Acta Ornithologica 35: 109-116.
Osiejuk, T.S. 2000. Recognition of individuals by song, using cross-correlation of sonograms of Ortolan buntings Emberiza hortulana. Biological Bulletin of Poznań 37: 96-106.
Osiejuk, T.S. (2000) Metody nagrywania i analizy dźwięków w badaniach bioakustycznych. Nietoperze 1: 71-92.
Kuczyński, L., Osiejuk, T.S., & Tryjanowski, P. (2000) Bird-habitat relationships on wet meadows in the Słońsk nature reserve, W Poland. Biological Bulletin of Poznań 37: 5-15.
Tryjanowski, P., Osiejuk, T.S. (2000) Female song in birds: moving from a temperate zone bias towards a unisexual theory of song. Biological Bulletin of Poznań 37: 59-67
Osiejuk, T.S., Kuczyński, L., Jermaczek, A., Tryjanowski, P. (1999) The effect of water condition on breeding bird communities of pastures, meadows, and shrub habitats in Słońsk reserve, NW Poland. Biologia, Bratislava 54: 207-214.
Osiejuk, T.S. (1998) Study on the intersexual differentiation of foraging niche in relation to abundance of winter food in Great Spotted Woodpecker Dendrocopos major. Acta Ornithologica 33: 135-141.
Osiejuk , T.S. (1998) Correlates of creeping speed in treecreepers. 100: 174-177.
Osiejuk, T.S. (1996) Locomotion patterns in wintering bark-foraging birds. Ornis Fennica 73: 157-167.
Osiejuk, T.S. (1994) Sexual dimorphism in foraging behaviour of the Great Spotted Woodpecker (Dendrocopos major) during winters with rich crops of Scotch pine cones. Ornis Fennica 71: 144-150.