Characteristics of Occupied and Unoccupied Loggerhead Shrike Territories in Southeastern Alberta

Journal of Wildlife ManagementPublished 1 April 1993

David R. C. Prescott, Douglas M. Collister

DOI10.2307/3809432

Source URL

Citations34

SJR quartileQ1

SJR score0.78

SNIP0.99

TL;DR

Compared structural characteristics of loggerhead shrikes territories in southeastern Alberta with characteristics of visually similar, but unoccupied, sites in the same area predicted that if reproduction in this threatened population is limited by habitat availability, then occupied and unoccupied sites should consistently differ along ≥ 1 structural dimension.

Abstract

Population declines in loggerhead shrikes (Lanius ludovicianus) are most frequently blamed on habitat limitation. Thus, we compared structural characteristics of loggerhead shrike territories in southeastern Alberta with characteristics of visually similar, but unoccupied, sites in the same area. We predicted that if reproduction in this threatened population is limited by habitat availability, then occupied and unoccupied sites should consistently differ along ≥ 1 structural dimension. Stepwise discriminant function analysis (DFA) identified 5 of 15 habitat variables that were potential discriminators (P < 0.05) of site occupancy by shrikes. Canonical DFA showed that these 5 variables discriminated between occupied and unoccupied sites with 98.4% accuracy

Keywords

Agricultural and Biological SciencesEnvironmental Science

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