Tables and Appendices

Table 1

Snowy Owl Morphometric Data from North American Winter Studies.

The data in Table 1 are the result of several dedicated researchers who spend their winters trapping and banding Snowy owls. This is the largest data set of winter body mass records on live Snowy Owls anywhere in the world. Collectively these researchers provided ~150 years of experience.

Source:

¹Norman Smith, unpublished data; ²David Evans, unpublished data; ³Thomas McDonald, unpublished data; ⁴Mike Blom, unpublished data; ⁵Hardy Pletz, unpublished data; ⁶Dan Zazelenchuk, unpublished data.

Table 2

Food-niche breadth and dietary evenness of Snowy Owls.

Food-niche breadth (FNB) and dietary evenness (DIEV) of Snowy Owls from seven North American studies reporting 100 or more prey items, representing 5888 prey. Only prey identified to species were used in the calculations.

^a % Microtus = % of Mammals that are Microtus spp.

Source: Detienne et. al 2008

Table 3

Measures of Snowy Owl reproductive success.

Measures of Snowy Owl reproductive success at Barrow, AK (1993-2014). Number of nests, eggs, or nestlings given in parentheses (Owl Research Institute, unpublished data)

¹Percent eggs laid that hatched

²Percent nestlings hatched that dispersed from nest

³Percent nestlings hatched that were confirmed to fledged

⁴Percent nestlings hatched that were presumed to fledge based on age of last observation