Are All Global Positioning System Collars Created Equal? Correcting Habitat-Induced Bias Using Three Brands in the Central Canadian Rockies

Are All Global Positioning System Collars Created Equal? Correcting Habitat-Induced Bias Using Three Brands in the Central Canadian Rockies

Global positioning system (GPS) collars are changing the face of wildlife research, yet they still possess biases such as habitat- induced fix-rate bias, which is a serious concern for habitat selection studies. We studied GPS bias in the Central Canadian Rockies, a critical area for wildlife conser...

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Veröffentlicht in:The Journal of Wildlife Management. - The Wildlife Society. - 71(2007), 6, Seite 2026-2033
1. Verfasser: Hebblewhite, M. (VerfasserIn)
Weitere Verfasser: Percy, M., Merrill, E. H.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2007
Zugriff auf das übergeordnete Werk:The Journal of Wildlife Management
Schlagworte:Advanced Telemetry Systems Elk Global Positioning System collar Habitat bias LOTEK Radiotelemetry Televilt Wolf Applied sciences Behavioral sciences mehr... Biological sciences Physical sciences Philosophy
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520 |a Global positioning system (GPS) collars are changing the face of wildlife research, yet they still possess biases such as habitat- induced fix-rate bias, which is a serious concern for habitat selection studies. We studied GPS bias in the Central Canadian Rockies, a critical area for wildlife conservation, to provide a statistical approach to correct GPS habitat bias for habitat selection studies using GPS collars. To model GPS habitat bias we deployed 11 different collars from 3 brands of GPS collars (Advanced Telemetry Systems [ATS], Asanti, MN; LOTEK Engineering Ltd., Newmarket, ON, Canada; and Televilt, Lindesberg, Sweden) in a random-stratified design at 86 sites across habitat and topographic conditions. We modeled the probability of obtaining a successful location, $P_FIX$ as a function of habitat, topography, and collar brand using mixed-effects logistic regression in an information theoretic approach. For LOTEK collars, we also investigated the effect of 8 and 12 GPS channels on fix rate. The ATS collars had the highest overall fix rates (97.4%), followed by LOTEK 12 channel (94.5%), LOTEK 8 channel (85.6%), and Televilt (82.3%). Sufficient model selection uncertainty existed to warrant model averaging for logistic regression $P_FIX$ models. Collar brand influenced fix rate in all $P_FIX$ models: fix rates for ATS and LOTEK 12 channel were not statistically different, whereas LOTEK 8 channel receivers had intermediate fix rates, and Televilt had the lowest. Fix rate was reduced in aspen stands, closed coniferous stands, and sites in narrow mountainous valleys but was higher on upper mountain slopes. Slight discrepancies between fix rates from field trials and observed species fix rates (wolf [Canis lupus] and elk [Cervus elaphus]) suggest uncorrected behavioral or movement-induced bias similar to other recent studies. Regardless, the strong habitat-induced bias in GPS fix rates confirms that in our study area habitat effects are critical, especially for poorer performance brands. Based on previous studies of effects of the amount of bias on inferences, our results suggest correction for GPS bias should be mandatory for Televilt collars in the Canadian Rockies, optional for LOTEK (dependent on the no. of channels), and unnecessary for ATS. Thus, our GPS bias model will be useful to researchers using GPS collars on a variety of species throughout the Rocky Mountain cordillera. 
540 |a Copyright 2007 The Wildlife Society 
650 4 |a Advanced Telemetry Systems 
650 4 |a Elk 
650 4 |a Global Positioning System collar 
650 4 |a Habitat bias 
650 4 |a LOTEK 
650 4 |a Radiotelemetry 
650 4 |a Televilt 
650 4 |a Wolf 
650 4 |a Applied sciences  |x Engineering  |x Transportation  |x Transportation engineering  |x Navigation  |x Navigational aids  |x Global positioning systems 
650 4 |a Behavioral sciences  |x Ethology  |x Animal behavior  |x Habitat selection 
650 4 |a Biological sciences  |x Biology  |x Conservation biology  |x Conservation agriculture  |x Habitat conservation 
650 4 |a Biological sciences  |x Biology  |x Zoology  |x Animals  |x Mammals  |x Canines  |x Wolves 
650 4 |a Biological sciences  |x Biology  |x Botany  |x Plant ecology  |x Forest ecology  |x Forest ecosystems  |x Forest habitats 
650 4 |a Biological sciences  |x Biology  |x Zoology  |x Animals  |x Mammals  |x Ungulates  |x Ruminants  |x Deer  |x Elks 
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650 4 |a Philosophy  |x Applied philosophy  |x Philosophy of science  |x Scientific method  |x Research variables  |x Research biases  |x Techniques and Technology Articles 
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700 1 |a Percy, M.  |e verfasserin  |4 aut 
700 1 |a Merrill, E. H.  |e verfasserin  |4 aut 
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