|Sponsor:||Weyerhaeuser Company Limited|
Residual tree retention has been proposed as a potential tool in the conservation of forest songbirds in logged landscapes. This study was part of a Masters Thesis project that looked at the effects of densities of residual trees on songbird abundance. The densities investigated varied from 10-133 trees/ha. This study also used artificial nests to investigate nest predation. The songbirds were censused three years post logging and compared to census data from the first-year post logging. Songbirds were more prevalent in forested areas than compared to logged areas in years with differences in species represented in each area. There were few differences between species reported or amounts as a result of varying densities of tree retention, and nest predation did not differ between varying densities. The study recommended that residual trees be left in logged areas for songbird conservation but could not make a recommendation on the density as there was little difference among the densities studied. It might be useful in further research to study densities lower than 10 trees/ha as these are used operationally by some logging companies. The final report was submitted as a M.Sc thesis in the Fall of 1988 by Rebecca Tittler entitled, “Effects of residual tree retention on breeding songbirds in Alberta’s Boreal Mixedwood Forest”.