Abstract
During March-June 2000 we evaluated the use of call-response surveys to monitor breeding Yuma Clapper Rails (Rallus longirostris yumanensis) at the Ciénega de Santa Clara, Colorado River Delta, Sonora, Mexico. We assessed the effect that time of day, stage of breeding season, and number of survey periods had on the average number of rails detected at a station. Conducting call-response surveys resulted in a significant increase in the number of detected rails and reduced the coefficient of variation of the average number or rails per station, which increases the statistical power to detect population trends. Using this technique also appears to reduce the variation of rates of responses by rails through the breeding season when compared to passive listening. There was no difference between the number of rails detected during morning and afternoon surveys. The established protocol developed by the U.S. Fish and Wildlife Service for Yuma Clapper Rail surveys is adequate for monitoring, and it should continue to be implemented on a yearly basis at the Ciénega de Santa Clara and other wetlands of the Colorado River Delta in Mexico.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 151-155 |
| Number of pages | 5 |
| Journal | Journal of Field Ornithology |
| Volume | 73 |
| Issue number | 2 |
| State | Published - 2002 |
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Keywords
- Ciénega de Santa Clara
- Clapper Rail
- Colorado River Delta
- Endangered species
- Marsh birds
- Population trends
ASJC Scopus subject areas
- Animal Science and Zoology
Cite this
Evaluation of call-response surveys for monitoring breeding Yuma Clapper Rails (Rallus longirostris yumanensis). / Hinojosa-Huerta, Osvel; DeStefano, Stephen; Shaw, William W.
In: Journal of Field Ornithology, Vol. 73, No. 2, 2002, p. 151-155.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Evaluation of call-response surveys for monitoring breeding Yuma Clapper Rails (Rallus longirostris yumanensis)
AU - Hinojosa-Huerta, Osvel
AU - DeStefano, Stephen
AU - Shaw, William W
PY - 2002
Y1 - 2002
N2 - During March-June 2000 we evaluated the use of call-response surveys to monitor breeding Yuma Clapper Rails (Rallus longirostris yumanensis) at the Ciénega de Santa Clara, Colorado River Delta, Sonora, Mexico. We assessed the effect that time of day, stage of breeding season, and number of survey periods had on the average number of rails detected at a station. Conducting call-response surveys resulted in a significant increase in the number of detected rails and reduced the coefficient of variation of the average number or rails per station, which increases the statistical power to detect population trends. Using this technique also appears to reduce the variation of rates of responses by rails through the breeding season when compared to passive listening. There was no difference between the number of rails detected during morning and afternoon surveys. The established protocol developed by the U.S. Fish and Wildlife Service for Yuma Clapper Rail surveys is adequate for monitoring, and it should continue to be implemented on a yearly basis at the Ciénega de Santa Clara and other wetlands of the Colorado River Delta in Mexico.
AB - During March-June 2000 we evaluated the use of call-response surveys to monitor breeding Yuma Clapper Rails (Rallus longirostris yumanensis) at the Ciénega de Santa Clara, Colorado River Delta, Sonora, Mexico. We assessed the effect that time of day, stage of breeding season, and number of survey periods had on the average number of rails detected at a station. Conducting call-response surveys resulted in a significant increase in the number of detected rails and reduced the coefficient of variation of the average number or rails per station, which increases the statistical power to detect population trends. Using this technique also appears to reduce the variation of rates of responses by rails through the breeding season when compared to passive listening. There was no difference between the number of rails detected during morning and afternoon surveys. The established protocol developed by the U.S. Fish and Wildlife Service for Yuma Clapper Rail surveys is adequate for monitoring, and it should continue to be implemented on a yearly basis at the Ciénega de Santa Clara and other wetlands of the Colorado River Delta in Mexico.
KW - Ciénega de Santa Clara
KW - Clapper Rail
KW - Colorado River Delta
KW - Endangered species
KW - Marsh birds
KW - Population trends
UR - http://www.scopus.com/inward/record.url?scp=0035993949&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035993949&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0035993949
VL - 73
SP - 151
EP - 155
JO - Journal of Field Ornithology
JF - Journal of Field Ornithology
SN - 0273-8570
IS - 2
ER -