Accession Number : ADA322612

Title :   Standardization of Roadside Counts of Columbids in Puerto Rico and on Vieques Island. Resource Publication 197,

Corporate Author : PUERTO RICO DEPT OF NATURAL RESOURCES SAN JUAN

Personal Author(s) : Rivera-Milan, Frank F.

PDF Url : ADA322612

Report Date : 1993

Pagination or Media Count : 32

Abstract : Ten native species of pigeons and doves (Columbidae) occur in Puerto Rico and its offshore territories: scaly-naped pigeon (Columba squamosa), white-crowned pigeon (C. leucocephala), plain pigeon (C. inornata), white-winged dove (Zenaida asia tim), zenaida dove (Z. aurita), mourning dove (Z. macmum), common ground-dove (Columbina passerina), ruddy quail-dove (Geotrygon montana), Key West quail-dove (G. chrysia), and bridled quail-dove (G. mystacea). Roadside counts of the columbids began in 1985 on the Puerto Rican mainland and in 1991 on Vieques Island. Coefficients of variance (CV) in spring were relatively lower than CVs in winter, summer, and fail. Sample-size estimates of the columbids from the roadside counts varied by species, spatial and temporal scales, sensitivity (power of a test of a hypothesis), and precision (width of a confidence interval). For example, at an a of 0.05 (z = 1.96) and a mean CV of 116% (May 1987-92), 588 sampling units (8-km routes) were required for confidence limits of plus or minus for the mean number of calling zenaida doves per km in the dry zone of the Puerto Rican mainland. Guidelines for the standardization of roadside counts in Puerto Rico and on other Caribbean islands are given.

Descriptors :   *NATURAL RESOURCES, *ENVIRONMENTAL IMPACT, *BIRDS, *PIGEONS, MOISTURE CONTENT, WINTER, COEFFICIENTS, LOW LEVEL, PERSONNEL, HYPOTHESES, SUMMER, ASIA, ISLANDS, MONTANA, CONFIDENCE LIMITS, INTERVALS, PUERTO RICO, WEST INDIES.

Subject Categories : Economics and Cost Analysis
      Biology
      Environmental Health and Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE