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Author |
Ballard, G.; Nur, N.; Geupel, G.R. |
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Title |
INFLUENCE OF MIST-NETTING INTENSITY ON DEMOGRAPHIC INVESTIGATIONS OF AVIAN POPULATIONS |
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Journal Article |
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Year |
2004 |
Publication |
Studies in Avian Biology |
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29 |
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21-27 |
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capture probability, Chamaea fasciata, demographic monitoring, Melospiza melodia, mist netting, passerine, population size, sampling effort, spot mapping, Song Sparrow, Wrentit |
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Abstract |
We evaluated capture rates of juvenile and adult passerines, comparing two different netting regimes on the same study plot at the Palomarin Field Station, Point Reyes National Seashore, California. One set of nets was run approximately 5× as often as the other during the breeding season. For four resident species breeding in the immediate vicinity of the nets, results were compared to direct measures of productivity and breeding density as determined from nest monitoring, color banding of nestlings, and known densities of adults from spotmapping
censuses of color-banded individuals. Nets run 6 days/week captured an average of 42% of the Song Sparrows (Melospiza melodia) breeding within 100 m of the nets, whereas nets run 1 day/week averaged 10%. Capture rates of adult Wrentits (Chamaea fasciata) did not differ signifi cantly between netting regimes. Nets run with higher frequency detected direction of change in productivity in Song Sparrows accurately, whereas nets run with lower frequency did not. The reverse was true for Wrentits, though Wrentit fl edglings were twice as likely to be caught in the higher frequency nets. Distance from nest to net also infl uenced juvenile capture
probability. Results indicate the importance of using standardized netting protocol, and show that demographic indices based on mist netting should not be directly compared among species. Optimal netting frequency to attain study goals should be evaluated separately for each species. We caution investigators from drawing conclusions regarding songbird population size and demography based on mist-netting data alone. |
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Tom Gardali (tgardali@pointblue.org) |
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PRBO @ tgardali @ |
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10371 |
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10371 |
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