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The Effects of Red-Winged Blackbirds (Agelaius phoeniceus L.) on Biomass Production of Corn Grains (Zea mays L.)

M. I. Dyer
Journal of Applied Ecology
Vol. 12, No. 3 (Dec., 1975), pp. 719-726
DOI: 10.2307/2402084
Stable URL: http://www.jstor.org/stable/2402084
Page Count: 8
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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.
The Effects of Red-Winged Blackbirds (Agelaius phoeniceus L.) on Biomass Production of Corn Grains (Zea mays L.)
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Abstract

(1) The feeding of Red-winged Blackbirds on corn does not always result in loss of grain because feeding on the tips of the ears may stimulate extra growth. There is a point where the two actions balance out and beyond this, real crop loss occurs. (2) A model of this relationship is presented and an initial check of field data tends to bear out the initial assumptions. (3) Investigations of the major relationships between the avian pest and the agricultural crop should be done before major management programs are applied.

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