Document: MAT-3-53-10

The effects of resource-imposed nesting aggregations on nesting success in Loggerhead Shrikes in Southwest Oklahoma.

ETTERSON, M.A.*

University of Minnesota, St. Paul, MN 55108 USA 1

Abstract:
I followed nesting success of Loggerhead Shrikes (Lanius ludovicianus) in Comanche County Oklahoma in 1998 and 1999. Nests were located using a rigorous spatial sampling scheme. In 1998 I found 48 nests. In 1999 I found 39. I used Monte Carlo simulation to test for spatial pattern in the distribution of nests. Nests were significantly aggregated in both years (P < 0.05), however this appears to be a function of the distribution of nest trees (P > 0.05 when nest-tree distribution is considered). This forced aggregation does not appear to affect nesting success.

Keywords: territorial aggregation, extra-pair mating strategies, birds

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This abstract is being presented at: 1:00 PM in session:
Oral Session #14: Disturbance Effects on Bird Populations.