A Comprehensive Approach to Identifying Monitoring Priorities of Small Landbirds on Military Installations |
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Authors: | Donald P Althoff James W Rivers Jeffrey S Pontius Philip S Gipson Philip B Woodford |
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Institution: | (1) Division of Biology, Kansas State University, Manhattan, Kansas 66506, USA;(2) Department of Statistics, Kansas State University, Manhattan, Kansas 66506, USA;(3) Kansas Cooperative Fish and Wildlife Research UnitUS Geological SurveyDivision of Biology, Kansas State University, Manhattan, Kansas 66506, USA;(4) Integrated Training Area Management, AFZN-GT-RD Range Division, Philip B. Woodford, Fort Riley, Kansas 66442, USA;(5) Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, California 93106, USA |
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Abstract: | Military installations provide important native habitat for songbirds, including many species that have experienced population declines in recent decades. As part of the Land Condition Trend Analysis (LCTA) program to monitor animal populations on military lands, we surveyed small (<250 g) breeding landbirds on 60 permanent plots on the Fort Riley Military Installation in northeastern Kansas from 1991 to 2002. During this period, species richness averaged 39.0 species (SE 0.9)/year and mean species richness per plot ranged from 3.6 species (SE=0.2)/plot (1999) to 7.5 species (SE=0.3)/plot (1992). Turnover (the appearance and disappearance of species on all plots from one year to the next) ranged from 5 species (2000–2001) to 16 species (1992–1993) and was driven primarily by turnover of woodland species. We developed an index of relative difference (C) to evaluate relative trends of local populations and found that 25 species declined, 15 species increased, and 7 did not change. Based on migration assemblages, more resident species (6 of 10) and more short-distant migrants (9 of 12) decreased than long-distance migrants (10 vs. 11). Our analysis of major vegetation communities on plots showed few changes in the quantity of habitats (grassland vs. woodlands) during the study. Our results indicate that Fort Riley provides important habitats for many landbirds, particularly those that require grasslands for breeding. Several species exhibited local declines when compared to the regional Breeding Bird Survey routes. We offer an approach that evaluates population changes of small landbirds and provides objective inputs for conservation directives. These can be adopted easily for use on military installations (that use LCTA), parks, and wildlife refuges that have data from annual breeding bird surveys. |
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Keywords: | Index of relative difference Landbirds LCTA Military installations Population monitoring Species richness |
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