Effects of Survey Method on Observer Bias and Detection Probability of marsh Birds on St. Vincent NWR

Metadata Updated: December 11, 2019

In 2001, a national marsh bird monitoring protocol was developed for National Wildlife Refuges across North America. The protocol has been unproved each year with feedback from refuges that used it to monitor secretive marsh birds. However, few participants are incorporating methods to evaluate observer bias, or evaluate the differences in vocalization probability between surveys conducted during different times of day. Between 18 May and 14 July 2006 we conducted 4 replicate marsh bird surveys on 7 routes at St. Vincent National Wildlife Refuge, an island off the northwest coast of Florida. We conducted double-blind multiple-observer surveys, paired morning and evening surveys, and paired morning and night surveys to examine the factors that influence detection probability. Observer detection probability was similar for all species detected (clapper rail, 77%; common moorhen, 69%; and least bittern, 78%). Observer detection probability was higher for clapper rails during the call-broadcast period of the survey and higher for common moorhen and least bittern during the passive period of the survey. Vocalization probability was highest in morning for all species detected. However, only common moorhen and least bittern had significantly more birds detected on morning surveys when compared to evening surveys (P = 0.026, and P = 0.064 respectively), and only clapper rail had significantly more birds detected on morning surveys when compared to night surveys (P = 0.014).

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date May 1, 2019
Metadata Updated Date December 11, 2019

Metadata Source

Harvested from DOI CKAN Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Created Date May 1, 2019
Metadata Updated Date December 11, 2019
Publisher Fish and Wildlife Service
Unique Identifier FWS_ServCat_2319
Brent Frakes
Maintainer Email
Public Access Level public
Bureau Code 010:18
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Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Data Quality true
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Harvest Source Id 34ce571b-cb98-4e0b-979f-30f9ecc452c5
Harvest Source Title DOI CKAN Harvest Source
Data First Published 2006-08-01
Homepage URL https://ecos.fws.gov/ServCat/Reference/Profile/2319
Data Last Modified 2006-08-01
Program Code 010:094, 010:028
Related Documents "https://ecos.fws.gov/ServCat/Reference/Profile/2319"
Source Datajson Identifier true
Source Hash 37b2917df61e5d9c3f7980cc5d945cc93c7fa902
Source Schema Version 1.1
Spatial -91.51803,31.304472,-91.39847,31.5221043
Category "Unpublished Report"

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