Scientific articles on seals in peer-reviewed journals

The 2010s

Liukkonen L., Rautio A., Sipilä T., Niemi M., Auttila M., Koskela J., Kunnasranta M. 2017. Long-term effects of land use on perinatal mortality in the Endangered Saimaa ringed seal population. Endang Species Res 34:283-291.

Kunnasranta M., Niemi M., Auttila M. 2016. Saimaannorpan suojelubiologiaa: tutkimuksista toimenpiteisiin. Suomen Riista 62:71-82. (In Finnish with English summary)

Koivuniemi M., Auttila M., Niemi M., Levänen R., Kunnasranta M. 2016. Photo-ID as a tool for studying and monitoring the endangered Saimaa ringed seal. Endang Species Res 30:29-36

Auttila, M., Kurkilahti, M., Niemi, M., Levänen, R., Sipilä, T., Isomursu, M., Koskela, J. & Kunnasranta, M. 2016. Morphometrics, body condition, and growth of the ringed seal (Pusa hispida saimensis) in Lake Saimaa: implications for conservation. Marine Mammal Science 32: 252–267.

Zhelezniakov, A., Eerola, T., Koivuniemi, M., Auttila, M., Levänen, R., Niemi, M., Kunnasranta, M. & Kälviäinen, H. 2015. Segmentation of Saimaa ringed seals for identification purposes. Teoksessa:  Bebis, G., Boyle, R., Parvin, B., Koracin, D., Pavlidis, I., Feris, R.S., McGraw, T., Elendt, M., Kopper, R., Ragan, E., Ye, Z., Weber, G. (eds) Advances in Visual Computing, Lecture Notes in Computer Science, vol. 9475. Springer, Cham, pp.  227-236. 

Lyytikäinen, M. Pätynen, J., Hyvärinen, H., Sipilä, T. & Kunnasranta, M. 2015. Mercury and selenium balance in endangered Saimaa ringed seal depend on age and sex. Environmental Science & Technology 49: 11808–11816.

Oksanen, S. M., Niemi, M., Ahola, M. P. & Kunnasranta, M. 2015. Identifying foraging habitats of Baltic ringed seals using movement data. Movement Ecology 3:33.

Oksanen, S. M., Ahola, M. P., Oikarinen, J., & Kunnasranta, M. 2015. A novel tool to mitigate by-catch mortality of Baltic seals in coastal fyke net fishery. PLoS ONE 10(5): e0127510.

Valtonen, M., Heino, M., Aspi, J., Buuri, H., Kokkonen, T., Kunnasranta, M., Palo J. U. & Nyman, T. 2015. Genetic monitoring of a critically-endangered seal population based on field-collected placentas. Annales Zoologici Fennici 52: 51-65.

Kauhala, K., Kurkilahti, M., Ahola, M. P., Herrero, A., Karlsson, O., Kunnasranta, M., Tiilikainen, R. & Vetemaa, M. 2015: Age, sex and body condition of Baltic grey seals: Are problem seals a random sample of the population? Annales Zoologici Fennici 52: 103-114.

Auttila, M., Sinisalo, T., Valtonen, M., Niemi, M., Viljanen, M., Kurkilahti, M., & Kunnasranta, M. 2015. Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis). Marine Mammal Science 31: 45-65.

Nyman, T., Valtonen, M., Aspi, J., Ruokonen, M., Kunnasranta, M. & Palo, J. U. 2014. Demographic histories and genetic diversities of Fennoscandian marine and landlocked ringed seal subspecies. Ecology and Evolution 4: 3420-3434.

Oksanen, S. M., Ahola, M. P., Lehtonen, E., & Kunnasranta, M. 2014. Using movement data of Baltic grey seals to examine foraging-site fidelity: implications for seal-fishery conflict mitigation. Marine Ecology Progress Series 507: 297-308.

Valtonen, M., Palo, J. U., Aspi, J., Ruokonen, M., Kunnasranta, M. & Nyman, T. 2014. Causes and consequences of fine-scale population structure in a critically endangered freshwater seal. BMC Ecology 14:22.

Auttila, M., Niemi, M., Skrzypczak, T., Viljanen, M., & Kunnasranta, M. 2014. Estimating and mitigating perinatal mortality of the endangered Saimaa ringed seal (Phoca hispida saimensis) in a changing climate. Annales Zoologici Fennici 51: 526-534.

Kauhala, J., Ahola, M. & Kunnasranta, M. 2014. Decline in the pregnancy rate of Baltic grey seal females during the 2000s. Annales Zoologici Fennici 51: 313–324.

Niemi, M., Auttila, M., Valtonen, A., Viljanen, M., & Kunnasranta, M. 2013. Haulout patterns of Saimaa ringed seals and their response to boat traffic during the moulting season. Endangered Species Research 22: 115-124.

Martinez-Bakker, M. E., Sell, S. K., Swanson, B. J., Kelly, B. P., & Tallmon, D. A. (2013). Combined genetic and telemetry data reveal high rates of gene flow, migration, and long-distance dispersal potential in Arctic ringed seals (Pusa hispida). PLoS One 8: e77125.

Niemi, M., Auttila, M., Viljanen, M., & Kunnasranta, M. 2013. Home range, survival and dispersal of endangered Saimaa ringed seal pups: implications for conservation. Marine Mammal Science 29:1-13.

Niemi, M., Auttila, M., Viljanen, M., & Kunnasranta, M. 2012. Movement data and their application for assessing the current distribution and conservation needs of the endangered Saimaa ringed seal. Endangered Species Research 19:99-108.

Valtonen, M., Palo, J., Ruokonen, M., Kunnasranta, M. & Nyman, T. 2012: Spatial and temporal variation in genetic diversity of an endangered freshwater seal. Conservation Genetics 13: 1231-1245.

Kauhala, J., Ahola, M. & Kunnasranta, M. 2012. Demographic structure and mortality rate of a Baltic grey seal population at different stages of population change, judged on the basis of the hunting bag in Finland. Ann. Zool. Fenn. 49: 287-305.

Kauhala, K. & Kunnasranta, M. 2012. Size and structure of grey seal hunting bag in Finland. (In Finnish with English summary). Suomen Riista 58: 7-15.

Strandberg, U., Sipilä, T., Koskela J., Kunnasranta, M. & Käkelä, M. 2011: Vertical fatty acid profiles in blubber of a freshwater ringed seal - comparison to a marine relative. Journal of Experimental Marine Biology and Ecology 407 (2): 256-265.

Isomursu, M. & Kunnasranta, M. 2011. Trichinella nativa in grey seal Halichoerus grypus – Spill over from a highly endemic terrestrial ecosystem. Journal of Parasitology 97 (4): 735-736.

Kauhala, K., Kunnasranta, M. & Valtonen, M. 2011. Diet of grey seals in Finland in 2001-2007 – a preliminary study (In Finnish with English summary). Suomen Riista 57: 72-83.

Kelly, P.K., Badajos, O.H., Kunnasranta, M., Moran, J.R., Martinez-Bakker, M., Wartzok, D. & Boveng, P. 2010: Seasonal home ranges and fidelity to breeding sites among ringed seals. Polar Biology 33: 1095-1109.

Sainmaa, S. & Kunnasranta, M. 2010. Distemper viruses in seals – literature review. (In Finnish with English summary). Suomen Eläinlääkärilehti 116: 7-11.

The 2000s

Hyvärinen, H., Palviainen, A., Strandberg, U. & Holopainen, I.J. 2009: Aquatic Environment and Differentiation of Vibrissae: Comparison of Sinus Hair Systems of Ringed Seal, Otter and Pole Cat. Brain Behav Evol 74: 268-279.

Rautio, A., Niemi, M., Kunnasranta, M., Holopainen, I. & Hyvärinen, H. 2009: Vocal repertoire of the Saimaa ringed seal (Phoca hispida saimensis) during the breeding season. Marine Mammal Science 25(4): 920-930.

Strandberg, U., Käkelä, A, Lydersen C,  Kovacs KM, Grahl-Nielsen O, Hyvärinen H. & Käkelä, M. 2008: Stratification, composition, and function of marine mammal blubber: the ecology of fatty acids in marine mammals. Physiol Biochem Zool. 81(4): 473-85.

Bell,S., Hampshire, K. & Tonder, M. 2008. Person, place, and knowledge in the conservation of the Saimaa ringed seal. Society and Natural Resources 21(4): 277-293.

Usenius, T., Mustonen, A.-M., Usenius, J.-P., Hyvärinen, H., Sipilä, T., Koskela, J. T. & Nieminen, P. 2007: Magnetic resonance imaging and its applications in morphological studies of pinnipeds. Ann. Zool. Fennici 44: 355–367.

Sinisalo, T., Poulin, R., Högmnader, H, Juuti, T. & Valtonen E.T. 2004: The impact of sexual selection on Corynosoma magdaleni (Acanthocephala) infrapopulations in Saimaa ringed seals (Phoca hispida saimensis). Parasitology 128: 179-185.

Sinisalo, T., Kunnasranta, M. & Valtonen, T. 2003: Intestinal helminths of a landlocked ringed seal (Phoca hispida saimensis) population in eastern Finland. Parasitology Research, 91: 40-45.

Koskela, J.T., Kunnasranta, M., Hämäläinen, E. & Hyvärinen, H. 2002: Movements and use of haul-out sites of radio-tagged Saimaa ringed seal (Phoca hispida saimensis Nordq.) during the open-water season. Ann. Zool. Fenn. 39: 59-67.

Kostamo A, Hyvärinen H, Pellinen J. & Kukkonen JVK. 2002: Organochlorine concentrations in the Saimaa ringed seal (Phoca hispida saimensis) from Lake Haukivesi, Finland, in 1981-2000 and in its diet today. Environ. Toxicol. Chem. 21 (7), 1368-1376.

Kunnasranta, M., Hyvärinen, H., Häkkinen, J. & Koskela, J.T. 2002: Dive types and circadian behaviour patterns of Saimaa ringed seals Phoca hispida saimensis during the open-water season. Acta Theriologica 47 (1): 63-72.

Käkelä, A., Käkelä, R. & Hyvärinen, H. 2002: Analysis of hepatic vitamins A1, A2, their fatty acyl esters, and vitamin E for biomonitoring mammals feeding on freshwater fish. Environmental Toxicology and Chemistry 21: 390-396.

Palo, J.U., Hyvärinen, H., Helle, E., Mäkinen, H.S. & Väinölä, R. 2002: Postglacial loss of microsatellite variation in the landlocked Lake Saimaa ringed seal. Conservation Genetics 4: 117-128.

Kunnasranta, M., Hyvärinen, H., Sipilä, T. & Medvedev, N., 2001: Breeding habitat and lair structure of the ringed seal (Phoca hispida ladogensis) in northern Lake Ladoga in Russia. Polar Biology 24: 171-174.

Kostamo A, Viljanen M, Pellinen J. & Kukkonen J. 2000: EOX and organochlorine compounds in fish and ringed seal samples from Lake Ladoga, Russia. Chemosphere 41, 1733-1740.

Kostamo A, Medvedev N, Pellinen J, Hyvärinen H & Kukkonen JVK. 2000: Analysis of organochlorine compounds and extractable organic halogen in three subspecies of ringed seal from northeast Europe. Environ. Toxicol. Chem. 19 (4), 848-854.

The 1990s

Kokko, H., Helle, E., Lindström, J., Ranta, E., Sipilä, T. & Courchamp, F. 1999: Backcasting population sizes of ringed and grey seals in the Baltic and Lake Saimaa during the 20th century. Ann. Zool. Fenn. 36: 65-73.

Kunnasranta, M., Hyvärinen, H., Sipilä, T. & Koskela, J.T.1999: The diet of the Saimaa ringed seal Phoca hispida saimensis. Acta Theriologica 44 (4): 443-450.

Hyvärinen, H., Sipilä, T., Kunnasranta, M. & Koskela, J. T. 1998: Mercury pollution and the Saimaa ringed seal (Phoca hispida saimensis). Mar. Pollut. Bull. 36: 76-81.

Kokko, H., Lindström, J., Ranta, E., Sipilä, T. & Koskela, J. 1998: Estimating the demographic effective population size of the Saimaa ringed seal (Phoca hispida saimensis Nordq.). Anim. Cons. 1: 47-54.

Käkelä, R. & Hyvärinen, H. 1998: Composition of polyunsaturated fatty acids in the liver of freshwater and marine ringed seals (Phoca hispida ssp.) differs largely due to the diet of the seals. Comparative Biochemistry & Physiology - B: Comparative Biochemistry B 120: 231-237.

Käkelä, R. & Hyvärinen, H. 1997: Fatty acid compositions and vitamin A and E status of endangered freshwater ringed seals (from Finland and Western Russia) differ from those of marine seals. Recent Res.Devel.in Lipids Res. 1: 1-7.

Käkelä, R., Hyvärinen, H. & Käkelä, A. 1997: Vitamins A1 (Retinol), A2 (3,4-Didehydroretinol) and E (ƒ¿-Tocopherol) in the liver and blubber of lacustrine and marine ringed seals. Comp. Biochem. Physiol. 116B: 27- 33.

Medvedev, N., Panichev, N. & Hyvärinen, H. 1997: Levels of heavy metals in seals of Lake Ladoga and the White Sea. Sci. Total Environ. 206: 95-105.

Ranta, E., Lindström, J. & Kokko, H. 1996: Ecological risk analysis: the case of the Saimaa ringed seal. Ambio 25: 363-365.

Sipilä, T., Medvedev, N. V. & Hyvärinen, H. 1996: The Ladoga seal (Phoca hispida ladogensis Nordq.). Hydrobiologia 322: 193-198.

Kunnasranta, M., Hyvärinen, H. & Sorjonen, J. 1996: Underwater vocalizations of Ladoga ringed seals (Phoca hispida ladogensis Nordq.) in summertime. Mar. Mamm. Sci 12 (4): 611-618.

Käkelä, R. & Hyvärinen, H. 1996: Site-specific fatty acid composition in adipose tissues of several northern aquatic and terrestrial mammals. Comparative Biochemistry and Physiology 115B: 501-514.

Hyvärinen, H., Hämäläinen, E. & Kunnasranta, M. 1995: Diving behavior of the Saimaa ringed seal (Phoca hispida saimensis Nordq.). Mar. Mamm Sci 11(3): 324-334.

Koistinen, J., Paasivirta, J., Suonperä, M. & Hyvarinen H. 1995: Contamination of pike and sediment from the Kymijoki river by PCDs, PCDDs, and PCDFs: Contents and patterns compared to pike and sediment from the Bothnian Bay and seasl from Lake Saimaa. Environn. Sci. Technol. 29 (10): 2541-2547.

Käkelä, R., Ackman, R. G. & Hyvärinen, H. 1995: Very long chain polyunsaturated fatty acids in the blubber of ringed seals (Phoca hispida sp.) from Lake Saimaa, Lake Ladoga, the Baltic Sea and Spitsbergen. Lipids 30: 725-731.

Käkelä, R. & Hyvärinen, H. 1993: Fatty acid composition of fats around the mystacial and superciliary vibrissae differs from that of blubber in the Saimaa ringed seal (Phoca hispida saimensis). Comparative Biochemistry and Physiology 105B: 547-552.

Käkelä, R., Hyvärinen, H. & Vainiotalo, P. 1993: Fatty acid composition in liver and blubber of the Saimaa ringed seal (Phoca hispida saimensis) compared with that of the ringed seal (Phoca hispida Botnica) and grey seal (Halichoerus grypus) from the Baltic. Comparative Biochemistry and Physiology 105B: 553-565.

Hyvärinen, H. & Nieminen, M. 1990: Differentiation of the ringed seal in the Baltic Sea, Lake Ladoga and Lake Saimaa. Finnish Game Research 47: 21-27.

Sipilä, T. 1990: Lair structure and breeding habitat of the Saimaa ringed seal (Phoca hispida saimensis Nordq.) in Finland. Finnish Game Res. 47: 11-20.

Sipilä, T., Helle, E. & Hyvärinen, H. 1990: Distribution, population size and reproductivity of the Saimaa ringed seal (Phoca hispida saimensis Nordq.) in Finland, 1980-84. Finnish Game Res. 47: 3-10.

The 1980s and earlier

Hyvärinen, H. 1989: Diving in darkness: whiskers as sense organs of the ringed seal (Phoca hispida saimensis). J. Zool. (Lond.) 218: 663-678.

Valtonen, E.T. & Helle, E. 1988: Host-parasite relationships between two seal populations and two species of Corynosoma (Acanthocephala) in Finland. J. Zool. 214: 361-371.

Helle, E., Hyvärinen, H. & Stenman, O. 1985: PCB and DDT levels in the Baltic and Saimaa seal populations. Finnish Game Res. 44: 63-68.

Hyvärinen, H. & Sipilä, T. 1984: Heavy metals and high pup mortality in the Saimaa ringed seal population in Eastern Finland. Mar. Pollut. Bull. 15: 335-337.

Helle, E., Hyvärinen, H. & Sipilä, T. 1984: Breeding habitat and lair structure of the Saimaa ringed seal Phoca hispida saimensis Nordq. in Finland. Acta Zool. Fenn. 172: 125-127.

Hyvärinen, H. & Katajisto, H. 1984: Functional structure of the vibrissae of the ringed seal (Phoca hispida Schr.). Acta Zool. Fenn. 171: 27-30.

Helle, E., Hyvärinen, H., Pyysalo, H. & Wickström, K. 1983: Levels of organochlorine compounds in an inland seal population in Eastern Finland. Marine Pollution Bulletin 14: 256-260.

Kari, T. & Kauranen, P. 1978: Mercury and selenium contents of seals from fresh and brackish water in Finland. Bull. Envir. Contam. Toxic. 18: 273- 280.

Karppanen, E. & Henrikson, K. 1974: Kvicksilver- occh klorerade kolvätehalter I havs- och insjösälär. Suomen Eläinlääkärilehti.

Helminen, M., Karppanen, E. & Koivisto, I. 1969: Saimaan norpan elohopeapitoisuudesta 1967. Suomen Eläinlääkärilehti 74: 87-89.

Hendrikson, K, Karppanen, E. & Helminen, M. 1969: Mercury in inland and marine seals. Nordisk hygienisk tidskrift 50: 54-59.