Table 4. Top models of vegetative correlates (notation as per Table 1) for presence/absence, i.e., occupancy, and abundance of Bobolinks and Savannah Sparrows from three different regions, habitat types, and studies: Nova Scotia, i.e., hayfields, this study, Wisconsin (pastures; Renfrew 2002), and Iowa (prairies and restored grasslands; Fletcher 2003). Only combined-sex Bobolink data were available for Wisconsin. Lower-case letters represent variables important to Nova Scotia models not sampled in Wisconsin or Iowa. Logistic mixed-effects models were created to model occurrence, and linear mixed-effects models for abundance. Variables in bold are shared in top models for all study sites.
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Region |
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Top model of: |
Nova Scotia |
Wisconsin |
Iowa |
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Bobolink occupancy |
HD- FORB |
HD |
HD + LIT + COV |
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Bobolink abundance (♂ + ♀) |
HD + hemi + orth |
HD |
HD + LIT + FORB + COV |
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Bobolink abundance (♂) |
COV - alf |
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HD |
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Savannah Sparrow occupancy |
Colp - FORB - HD |
HD - COV |
LIT |
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Savannah Sparrow abundance |
dip - chil - HD |
HD + FORB |
- COV - HD |
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