Terhivuo, J. 1989: The Lumbricidae (Oligochaeta) of southern Finland: species assem- blages, numbers, biomass and respiration. — Annales Zoologici Fennici 26: 1–23.
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Kuitunen, M. 1989: Food supply and reproduction in the common treecreeper (Certhia familiaris). — Annales Zoologici Fennici 26: 25–33.
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Niemelä, J., Haila, Y., Halme, E., Pajunen, T. & Punnila, P. 1989: The annual activity cycle of carabid beetles in the southern Finnish taiga. — Annales Zoologici Fennici 26: 35–41.
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Nummi, P. 1989: Simulated effects of the beaver on vegetation, invertebrates and ducks. — Annales Zoologici Fennici 26: 43–52.
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Ranta, E. & Espo, J. 1989: Predation by the rock-pool insects Arctocorisa carinata, Callicorixa producta (Het. Corixidae) and Potamonectes griseostriatus (Col. Dytiscidae). — Annales Zoologici Fennici 26: 53–60.
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Holopainen, I. J. & Lopez, G. R. 1989: Functional anatomy and histology of the digestive tract of fingernail clams (Sphaeriidae, Bivalvia). — Annales Zoologici Fennici 26: 61–72.
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