Ylönen, H., Viitala, J. & Mappes, T. 1991: How much do avian predators influence cyclic bank vole populations? An experiment during a peak year. — Annales Zoologici Fennici 28: 1–6.
Full text (print quality pdf generated from scanned pages)

Ylönen, H., Altner, H.-J. & Stubbe, M. 1991: Seasonal dynamics of small mammals in an isolated woodlot and its agricultural surroundings. — Annales Zoologici Fennici 28: 7–14.
Full text (print quality pdf generated from scanned pages)

Hjältén, J. 1991: Muskrat (Ondatra zibethica) territoriality, and the impact of territorial choice on reproduction and predation risk. — Annales Zoologici Fennici 28: 15–21.
Full text (print quality pdf generated from scanned pages)

Elmberg, J. & Lundberg, P. 1991: Intraspecific variation in calling, time allocation and energy reserves in breeding male common frogs Rana temporaria. — Annales Zoologici Fennici 28: 23–29.
Full text (print quality pdf generated from scanned pages)

Peitsalmi, M. & Pajunen, V. I. 1991: Mapping the ocular field in Proteroiulus fuscus (Am Stein) (Diplopoda, Blaniulidae). — Annales Zoologici Fennici 28: 31–39.
Full text (print quality pdf generated from scanned pages)

Aarnio, K., Sandberg, E. & Bonsdorff, E. 1991: Benthic predation on shallow-water macro- and meiofauna in the Baltic Sea: an experimental comparison between Pomatoschistus minutus (Pisces) and Saduria entomon (Crustacea). — Annales Zoologici Fennici 28: 41–48.
Full text (print quality pdf generated from scanned pages)