Bird Studies Canada – why bother doing the summary if you know more than half the birds are not being collected? Why is the specific data on each projects ‘kill’ confidential? Do the wind companies own the wildlife here too? Seems like it.
“In Ontario, 1,187 bird carcasses were found, comprising 118 identified species. Passerines were the most common fatality, representing approximately 69% of all bird fatalities in Ontario. The most prevalent passerine species found were: Golden Crowned Kinglet (9.39% of all bird carcasses found), Red-eyed Vireo (6.91%) and Horned Lark (5.39%). Raptors represented 8% of all bird fatalities, with Turkey Vulture (2.29%) and Red-tailed Hawk (3.99%) found most commonly. Gulls represent approximately 2% of all bird fatalities; with Ring-billed Gull (1.59%) the most often reported Gull species. Waterbirds represent approximately 2% of all bird fatalities, with Mallard (1.29%) as the most frequently reported waterbird species.
Table 4 lists the top 20 bird species found during post-construction mortality monitoring at wind power projects in Ontario and the proportion of carcasses found of each species, listed from lowest rank (most prevalent across sites) to highest rank (least commonly found). A full list of fractional rankings by species is available in Appendix 2.”
Table 4: The top 20 bird species found at wind power projects in Ontario based on fractional ranking and percent species composition. A full list of fractional rankings by species is available in Appendix 2.
Rank Species % Composition
- Golden-crowned Kinglet 9.39%
- Red-eyed Vireo 6.19%
- Horned Lark 5.39%
- Purple Martin 6.09%
- Tree Swallow 8.79%
“The total number of operating turbines in Ontario as of February 2014 was 1,331 (CanWEA, personal communication) resulting in an estimated mortality of 7,250 bird fatalities (95% confidence interval of 6,236 to 8,265 fatalities) in Ontario between May 1st and October 31st based on February 2014 installed capacity.”
“The mortality estimates presented here potentially underestimate true mortality as they are based solely on carcasses that fell within 50 m of the turbine base. It is expected that a certain proportion of birds and bats will fall outside of this radius, and there are several different approaches to quantifying this correction factor as can be inferred based on extrapolation of Figures 11 and 12. Zimmerling et al. (2013) reported that turbine heights were very similar (~80 m) for most turbines installed in Canada as of 2011 and estimated the proportion of carcasses expected to fall outside of 50 m to be up to 51.8% of birds, based on 4 studies that searched a radius up to 85 m. These values were further validated based on a field trial that searched up to 85 m from the turbine base (Zimmerling et al. 2013). Smallwood (2013) found that the proportion of both birds and bats that fell within 50 m of the turbine base varied with turbine height and estimated higher correction factor values for carcasses falling outside of 50 m than Zimmerling et al. 2013. Smallwood (2013) fit a logistic function to carcass distributions, and the proportions of carcasses falling within the search radius were calculated based on a variety of search radius and turbine height combinations. For 80 m turbines, carcasses were expected to fall to a maximum distance of 156 m. These findings indicate that the mortality estimates presented here may underestimate true mortality, but still allow for comparisons amongst sites and regions as long as turbine heights are similar; this is an important consideration for future investigation of landscape level factors and mitigation measures.”
Read more here