Brown Treesnake counts during visual encounter surveys at three walking paces, Guam 2016

We evaluated three walking paces to estimate (1) how snake detection rate per unit distance changes with increasing pace, and (2) how total number of snakes found by the end of a night of surveying varies with pace when the amount of surveying time per night is held constant. For a “fast” pace we searched the 220 meter-long transect in 10 minutes, corresponding to a walking pace of 1.32 km/h, whereas for a “medium” pace we searched 17.5 minutes, corresponding to a pace of approximately 0.75 km/h. The “slow” pace was the 30 minutes (0.44 km/h) the standard previously adopted for work on Guam. Perch height and sizes of detected snakes were recorded for the three paces.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier USGS:5cc0be4fe4b09b8c0b726c20
metadata_type geospatial
modified 20200925
old-spatial 144.4592, 13.1972, 145.0745, 13.6673
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash 16b620c55d4d48a59b8581a4c8e778e16c342be9
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[144.4592, 13.1972], [144.4592, 13.6673], [ 145.0745, 13.6673], [ 145.0745, 13.1972], [144.4592, 13.1972]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • biota
  • ckan
  • geo
  • geoss
  • herpetology
  • national
  • north-america
  • united-states
  • usgs-5cc0be4fe4b09b8c0b726c20
isopen False
license_id notspecified
license_title License not specified
maintainer Amy A. Yackel Adams
maintainer_email yackela@usgs.gov
metadata_created 2025-11-21T04:54:28.835717
metadata_modified 2025-11-21T04:54:28.835721
notes We evaluated three walking paces to estimate (1) how snake detection rate per unit distance changes with increasing pace, and (2) how total number of snakes found by the end of a night of surveying varies with pace when the amount of surveying time per night is held constant. For a “fast” pace we searched the 220 meter-long transect in 10 minutes, corresponding to a walking pace of 1.32 km/h, whereas for a “medium” pace we searched 17.5 minutes, corresponding to a pace of approximately 0.75 km/h. The “slow” pace was the 30 minutes (0.44 km/h) the standard previously adopted for work on Guam. Perch height and sizes of detected snakes were recorded for the three paces.
num_resources 2
num_tags 11
title Brown Treesnake counts during visual encounter surveys at three walking paces, Guam 2016