Amy A. Yackel Adams Bjorn Lardner 20200925 tabular digital data https://doi.org/10.5066/P984A6M8 Björn Lardner Amy A. Yackel Adams Julie A. Savidge Robert N. Reed 2019 tabular digital data 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. Quantifying the optimal search pace for one’s study organism in a focal habitat has the potential to substantially increase survey cost-efficacy through optimal survey design. 20160425 20160718 ground condition Complete None planned 144.4592 145.0745 13.6673 13.1972 Guam ISO 19115 Topic Category biota USGS Thesaurus herpetology USGS Metadata Identifier USGS:5cc0be4fe4b09b8c0b726c20 Common geographic areas Guam None. Please see 'Distribution Info' for details. None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations. USGS Amy A. Yackel Adams Research Ecologist mailing and physical

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Fort Collins Colorado 80526 US 970-226-9489 yackela@usgs.gov Funding was provided by the U.S. Department of the Navy, Joint Region Marianas (Agreement Number N6112814MP002GS), and coordinated by S. Mosher and M. Mazurek. All data were entered by those collecting the data and then proofed by other project personnel. No erroneous outliers or duplicate entries are contained in the data set. This dataset is complete in relation to information given the abstract. Although this data and information has been processed successfully on a computer system at the USGS Fort Collins Science Center, no warranty expressed or implied is made regarding the accuracy or utility of the data and information on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and information, and aggregate use with other data and information. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. A formal accuracy assessment of the vertical positional information in the data set has either not been conducted or is not applicable. Data were collected in the field via biologists during visual encounter surveys and combined into a single database. All data were proofed by another biologist to ensure data quality control. 20160831 Visual Survey Pace data.csv Comma Separate Value (CSV) file containing data. Producer defined Date Start date of nocturnal transect survey Producer defined 4-25-2016 7-18-2016 day CATEGORY_JULIAN_DATE Julian date Producer defined CAT_Julian_Date_1 CAT_Julian_Date_85 day MIDPOINT_TIME_decimal_hr Midpoint of visual survey recorded in decimal hour Producer defined 19.1833 23.9958 MIDPOINT_TIME_decimal_hr_DEVfromMEAN Time at the focal transect midpoint, a parametric variable expressed as a deviation in decimal-hours from the global mean Producer defined -1.584159783 3.228340217 decimal hour km_per_h Walking pace recorded in kilometers per hour Producer defined 0.44 1.32 kilometer per hour 0.01 PACE_CAT Walking pace categories Producer defined PACE_1_MEDIUM A medium pace consisted of searching a 220-m transect in 17.5 minutes, corresponding to a pace of approximately 0.75 km/h. Producer defined PACE_2_FAST A fast pace consisted of searching a 220-m transect in 10 minutes, corresponding to a walking pace of 1.32 km/h. Producer defined PACE_0_SLOW A slow pace consisted of searching the 220-m transect in 30 minutes, corresponding to a walking pace of 0.44 km/h. Producer defined OBSERVERCODE Observer/searcher code base on alpha-numeric code Producer defined Unique searcher codes for individuals conducting the nocturnal visual surveys. OBSERVERCODE01= Observer 1, OBSERVERCODE02 = Observer 2, and so on up to OBSERVERCODE09 = Observer 9. TRANSECT Unique transect identification Producer defined Unique transect identification (alpha numeric codes) defined in this study to keep track of individual transects. EDGE vs INTERIOR Spatial location of transects defined as either edge of forest or forest interior Producer defined Interior Forest habitat on both sides of transect Producer defined EDGE Forest habitat on one of the transect Producer defined SNAKE COUNT Number of Brown Treesnakes detected on a visual survey per transect. Producer defined 0 3 snake 1 VISPACE PERCH_HEIGHT by PACE data csv for KS test 31AUG16.csv Comma Separate Value (CSV) file containing data. Producer defined PACE Walking pace used during visual surveys for Brown Treesnakes Producer defined FAST A fast pace consisted of searching the 220-m transect in 10 minutes, corresponding to a walking pace of 1.32 km/h Producer defined MEDIUM A medium pace consisted of searching the 220-m transect in 17.5 minutes, corresponding to a pace of approximately 0.75 km/h. Producer defined SLOW A slow pace consisted of searching the 220-m transect in 30 minutes, corresponding to a pace of approximately 0.44 km/h. Producer defined PERCH_HEIGHT The height above the spot on the ground-that is immediately below the animal-when first detected. Zero values indicate that snake was first detected on the ground. Producer defined 0.0 7.0 meter 0.1 VISPACE SVL by PACE data csv for KS test 31AUG16.csv Comma Separate Value (CSV) file containing data. Producer defined PACE Walking pace used during visual surveys for Brown Treesnakes Producer defined FAST A fast pace consisted of searching the 220-m transect in 10 minutes, corresponding to a walking pace of 1.32 km/h Producer defined MEDIUM A medium pace consisted of searching a 220-m transect in 17.5 minutes, corresponding to a pace of approximately 0.75 km/h. Producer defined SLOW A slow pace consisted of searching the 220-m transect in 30 minutes (0.44 km/h), corresponding to a pace of approximately 0.44 km/h. Producer defined SVLmean Mean snout-vent length of snake across the measures obtained during the study period Producer defined 609 1220 mm 1 U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P984A6M8 None 20200925 USGS Amy A. Yackel Adams Research Ecologist mailing and physical

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Fort Collins Colorado 80526 US 970-226-9489 yackela@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999