Seppanen, R. 1981: Differences in spotting pattern between populations of Aphantopus hyperantus (Lepidoptera, Satyridae) in southern Finland. — Annales Zoologici Fennici 18: 1–36.
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Werdelin, L. 1981: The evolution of lynxes. — Annales Zoologici Fennici 18: 37–71.
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Kansanen, P. H. & Aho, J. 1981: Changes in the macrozoobenthos associations of polluted Lake Vanajavesi, southern Finland, over a period of 50 years — Annales Zoologici Fennici 18: 73–101.
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Alatalo, R. V. 1981: Habitat selection of forest birds in the seasonal environment of Finland. — Annales Zoologici Fennici 18: 103–114.
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Kristiansson, H. 1981: Distribution of the European hedgehog (Erinaceus europaeus L.) in Sweden and Finland. — Annales Zoologici Fennici 18: 115–119.
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Sunila, I. 1981: Reproduction of Mytilus edulis L. (Bivalvia) in a brackish water area, the Gulf of Finland. — Annales Zoologici Fennici 18: 121–128.
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Pajunen, I. 1981: Effect of long laboratory rearing on the hibernation pattern in the garden dormouse, Eliomys quercinus. — Annales Zoologici Fennici 18: 129–132.
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Räisänen, P., Timola, O. & Valtonen, T. 1981: A new corer for sampling sand and moraine bottom meiofauna. — Annales Zoologici Fennici 18: 133–137.
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Terhivuo, J. 1981: Provisional atlas and population status of the Finnish amphibian and reptile species with reference to their ranges in northern Europe. — Annales Zoologici Fennici 18: 139–164.
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Korhonen, K. 1981: Temperature in the nocturnal shelters of the redpoll (Acanthis flammea L.) and the Siberian tit (Parus cinctus Budd. ) in winter. — Annales Zoologici Fennici 18: 165–167.
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Karling, T. G. 1981: Typhlorhynchus nanus Laidlaw, a kalyptorhynch turbellarian without proboscis (Platyhelminthes). — Annales Zoologici Fennici 18: 169–177.
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Hippa, H. & Oksala, I. 1981: Polymorphism and reproductive strategies of Enoplognatha ovata (Clerck) (Araneae, Theridiidae) in northern Europe. — Annales Zoologici Fennici 18: 179–190.
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Pajunen, V. I. 1981: Analysis of developmental rates in field populations of Arctocorisa carinata (Sahlb.) and Callicorixa producta (Reut.) (Hemiptera, Corixidae) with the aid of developmental time axes. — Annales Zoologici Fennici 18: 191–197.
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Väisänen, R. 1981: Is there more than one successional phase in the mycetophilid (Diptera) community feeding on a mushroom? — Annales Zoologici Fennici 18: 199–201.
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Palmgren, P. 1981: The mechanism of the extrinsic coxal muscles of spiders. — Annales Zoologici Fennici 18: 203–207.
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Pankakoski, E. 1981: Actinomycosis-like lesions in skulls of Finnish muskrats, Ondatra zibethica (L.). — Annales Zoologici Fennici 18: 209–212.
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Sunila, I. 1981: Toxicity of copper and cadmium to Mytilus edulis L. (Bivalvia) in brackish water. — Annales Zoologici Fennici 18: 213–223.
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Gyllenberg, G. 1981: Ingestion and turnover of oil and petroleum hydrocarbons by two planctonic copepods in the Gulf of Finland. — Annales Zoologici Fennici 18: 225–228.
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Gyllenberg, G. 1981: Eudiaptomus gracilis (Copepoda, Calanoida): diel vertical migration in the field and diel oxygen consumption rhythm in the laboratory. — Annales Zoologici Fennici 18: 229–232.
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Aho, J., Ranta, E. & Vuorinen, J. 1981: Species composition of freshwater snail communities in lakes of southern and western Finland. — Annales Zoologici Fennici 18: 233–241.
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Kansanen, P. H . 1981: Effects of heavy pollution on the zoobenthos in Lake Vanajavesi, southern Finland, with special reference to the meiozoobenthos. — Annales Zoologici Fennici 18: 243–251.
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Sjöberg, K. & Danell, K. 1981: Food availability and utilization by ducks of a shallow brackish-water bay in the northern Bothnian Bay. — Annales Zoologici Fennici 18: 253–261.
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Pulliainen, E. & Iivanainen, J. 1981: Winter nutrition of the willow grouse (Lagopus lagopus L.) in the extreme north of Finland. — Annales Zoologici Fennici 18: 263–269.
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Pulliainen, E. 1981: A transect survey of small land carnivore and red fox populations on a subarctic fell in Finnish Forest Lapland over 13 winters. — Annales Zoologici Fennici 18: 270–278.
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