. The Canadian field-naturalist. 7_8 9 , ^ SHRUB VOLUME [LOOOrnVha). 0 1 2 3 or ADJACENT MALES (no. Figure 2. Relationships of herbaceous vegetation in rural habitat (A), shrub volume in suburban habitat (B), and number of conspecific males (C) in both habitats, to Song Sparrow territory size. shrubs accounted for more variability in territory size than did shrub volume (Figure 1). Tall weedy rural vegetation and suburban shrubs likely meet the same needs. Positive correlations with territory size in each case suggest a similarity — if not in form, then in
. The Canadian field-naturalist. 7_8 9 , ^ SHRUB VOLUME [LOOOrnVha). 0 1 2 3 or ADJACENT MALES (no. Figure 2. Relationships of herbaceous vegetation in rural habitat (A), shrub volume in suburban habitat (B), and number of conspecific males (C) in both habitats, to Song Sparrow territory size. shrubs accounted for more variability in territory size than did shrub volume (Figure 1). Tall weedy rural vegetation and suburban shrubs likely meet the same needs. Positive correlations with territory size in each case suggest a similarity — if not in form, then in use or function ( song perch, nest substrate, cover). The positive correlation with herbaceous vegetation area may reflect a requirement for some degree of habitat "openness", but more likely a need to establish larger territories in more open areas to include enough of the shrub components. In a study of territory and mating success of the Field Sparrow (Spizellapusilla), Best (1977) found that males with larger territories mated more frequently, and that territory size was correlated positively with coverages of several grasses and associated plants. Preferred territories of Vesper Sparrows (Pooecetes gramineus) contained more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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