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We compared survival, reproduction, and body mass of radio-marked and non-radio-marked spotted owls (Strix occidentalis) to determine if backpack radios influenced reproduction or survival. In most study areas and years, there were no differences (P>0.05) in survival of males and females or in survival of radio-marked versus banded owls. There was no difference (P=0.31) in mean mass of owls before and after they had worn radio transmitters. Radio-marked owls produced fewer (P<0.01) young than did owls that were not radio-marked
Foster et al. (Wed,) studied this question.
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