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Evidence of Male-Bias in Capture Samples of Marbled Murrelets from Genetic Studies in British Columbia

Brett A. Vanderkist, Xiao-Hua Xue, Richard Griffiths, Kathy Martin, Wendy Beauchamp and Tony D. Williams
The Condor
Vol. 101, No. 2 (May, 1999), pp. 398-402
DOI: 10.2307/1370004
Stable URL: http://www.jstor.org/stable/1370004
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Evidence of Male-Bias in Capture Samples of Marbled Murrelets from Genetic Studies in British Columbia
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Abstract

We report a significant male-bias (1.8:1) in Marbled Murrelets (Brachyramphus marmoratus) captured with floating mist nets during the breeding season over four years (1994-1997) at Theodosia Inlet, Desolation Sound, British Columbia. There was little evidence for marked annual or diurnal variation in male-bias, or for variation due to flight direction of birds when they contacted the net (inland vs. out to sea). In contrast, samples of adult and juvenile Marbled Murrelets captured using a night-lighting technique at Desolation Sound in 1997 were not male-biased. We believe that the most likely explanation for our results is that there are sex-specific differences in behavior of Marbled Murrelets during the breeding period, such that more males than females are flying between marine foraging and inland nesting areas.

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