STP1055

    Effective Plot Sizes for Testing Red-Winged Blackbird Repellents in a Large Flight Pen

    Published: Jan 1989


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    Abstract

    Three plot sizes (36, 78, and 108 m2) were evaluated for testing blackbird seed repellents within a 0.2-ha flight pen. Groups of 12 to 20 red-winged blackbirds were observed as they foraged on pairs of plots within each size category. One plot from each pair was sown with 134 kg/ha of rice seed treated with 1.25-g methiocarb/kg of seed. Plot selection, avoidance, discrimination, and latency to discrimination were determined for each plot size. With the 36-m2 plots, there were long delays in selecting untreated plots, treated plots were not avoided, the birds had difficulty discriminating between the plots, and results were inconsistent among replicates. The 78-m2 plots were adequate for most purposes, but the clearest and most consistent results were from the 108-m2 plots. These plots were readily found by the birds, were accurately discriminated, and had bird pressure similar to that observed in Louisiana rice fields.

    Keywords:

    methiocarb, bird repellent, plot size, repellent testing, Agelaius phoeniceus, blackbird, simulated field study, flight pen


    Author Information:

    Daneke, DE
    Wildlife biologist, University of Florida, Cooperative Fish and Wildlife Research Unit, GainesvilleStevensville, FLMT

    Avery, ML
    Project leader, Florida Field Station, Denver Wildlife Research Center, USDA/APHIS, Gainesville, FL


    Paper ID: STP25257S

    Committee/Subcommittee: E35.17

    DOI: 10.1520/STP25257S


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