Abstract

The responses of the reindeer lichens (Cladina stellaris, C. rangiferina, and C. mitis) to logging and fire were compared in lichen-rich forest stands in northwestern Ontario. In the summer of 1992, reindeer lichen cover, in total and by species, was visually estimated and detailed notes were taken on reindeer lichen conditions, modes of reproduction, and substrate use on 34 undisturbed, burned, or logged sites. While virtually no reindeer lichens survived forest fire, much of the reindeer lichen cover remained after logging. Reindeer lichen cover increased with time since fire. Total reindeer lichen cover was not correlated with time since logging. Fragment growth was found to be an important mode of reproduction on logged sites, and occurred with greater frequency on logged sites than on burned sites. Colonization of organic substrates by reindeer lichens was observed on both logged and burned sites.

Highlights

  • The responses of the reindeer lichens (Cladina stellaris, C. rangiferina, and C. mitis) to logging and fire we compared in lichen-rich forest stands in northwestern Ontario

  • Recent studies have documented that reindeer lichens are abundant for more than 40 years after logging in some forest stands in northwestern Ontario (Harris, 1996; Racey et al, 1996) and that some of these stands are being used by woodland caribou as winter habitat (Racey et al, 1996)

  • C. mitis and total reindeer lichen cover increased with time since forest fire (Table 1, Fig. 1)

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Summary

Introduction

The responses of the reindeer lichens (Cladina stellaris, C. rangiferina, and C. mitis) to logging and fire we compared in lichen-rich forest stands in northwestern Ontario. Post-fire lichen ties serve as late winter habitat for woodland cari- and bryophyte succession follows a general progresbou (Rangifer tarandus caribou), and the reindeer sion, first described by Ahti (1959) and documented lichens, Cladina stellaris (Opiz) Brodo, C. rangiferina throughout the boreal forest in Canada Their primary late winter fodder (Simkin, 1965; Bouchard, 1983; Foster, 1985; Morneau & Payette, Darby & Pruitt, 1984; Cumming & Beange, 1987; 1989). Recent studies have documented that reindeer lichens are abundant for more than 40 years after logging in some forest stands in northwestern Ontario (Harris, 1996; Racey et al, 1996) and that some of these stands are being used by woodland caribou as winter habitat (Racey et al, 1996)

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