Mortality causes in British Barn Owls (Tyto alba), based on 1,101 carcasses examined during 1963-1996

I. Newton; I. Wyllie; L. Dale

Treesearch

Mortality causes in British Barn Owls (Tyto alba), based on 1,101 carcasses examined during 1963-1996

Informally Refereed

Authors:

I. Newton, I. Wyllie, L. Dale

Year:

1997

Type:

General Technical Report

Station:

Northern Research Station

Source:

In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 299-307.

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Abstract

During 1963-1996, 1,101 Barn Owl (Tyto alba) carcasses were received for autopsy and chemical analysis. Much larger numbers were received per month outside the breeding season than within it. A peak in the monthly mortality of first year birds occurred in autumn (November) and a peak in the mortality of adults in late winter (March).

Parent Publication

Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium

Citation

Newton, I.; Wyllie, I.; Dale, L. 1997. Mortality causes in British Barn Owls (Tyto alba), based on 1,101 carcasses examined during 1963-1996. In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 299-307.