Colonisation of a burned forest by ants in the southern Finnish boreal forest

Silva Fennica 30(4): 421–435

The colonisation of a burned clearcut by ants in southern Finland was monitored using pitfall traps, artificial nest sites, and direct nest sampling from the ground and stumps. Clearcutting and fire seemed to have destroyed wood-ant colonies (Formica rufa group), and also other mature-forest species suffered from fire. Myrmica ruginodis was able to survive only in less severely burned moist sites, whereas it benefitted from the enhanced light conditions in a non-burned clearcut. The fire resulted in an essentially ant-free terrain into which pioneering species immigrated. The mortality of nest-founding queens appeared to be high. The results supported the hypothesis that the pioneering species tend to be those that are capable of independent colony founding, followed by species founding nests through temporary nest parasitism. The succession of the burned clearcut differed from that of the non-burned one, suggesting that habitat selection in immigration and priority effects, i.e. competition, introduce deterministic components in the successional pathways of boreal ant communities.

Keywords
forest fires, succession, competition, ant communities, boreal forests

Addresses
Punttila, Department of Ecology and Systematics, Division of Population Biology, P.O. Box 17, FIN-00014 University of Helsinki, Finland; Haila, Satakunta Environmental Research Centre, University of Turku, Reposaari, FIN-28900 Pori, Finland. Fax +358 9 191 7492, E-mail pekka.punttila@helsinki.fi

Received 22 May 1995 Accepted 13 September 1996
ISSN 0037-5330

Comments