The effect of frequency of telemetry locations on movement-rate calculations in arctic caribou

There is a trade-off between the frequency of telemetry locations (fix interval) and battery life when using Global Positioning System (GPS) collars. In general, decreasing the fix interval lowers the effective battery life of the collar. However, the strong relationship between fix interval and mov...

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Vydáno v:Wildlife Society bulletin Ročník 38; číslo 1; s. 78 - 88
Hlavní autoři: Prichard, Alexander K., Yokel, David A., Rea, Caryn L., Person, Brian T., Parrett, Lincoln S.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Blackwell Publishing Ltd 01.03.2014
Wildlife Society
Wiley
Témata:
Alaska
caribou
Caribous
Datasets
Estimate reliability
fix interval
frequency of relocation
Global positioning systems
Herds
Interval estimators
movement rates
Original Article
Rangifer tarandus
Telemetry
Teshekpuk Caribou Herd
Travel
Wildlife
Wildlife management
ISSN:1938-5463, 2328-5540, 1938-5463, 2328-5540
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Popis
Shrnutí:There is a trade-off between the frequency of telemetry locations (fix interval) and battery life when using Global Positioning System (GPS) collars. In general, decreasing the fix interval lowers the effective battery life of the collar. However, the strong relationship between fix interval and movement metrics is often underappreciated. Mean movement rates, maximum movement rates, total distance estimates, and some screening algorithms change dramatically with different fix intervals, particularly for highly mobile animals such as caribou (Rangifer tarandus), and must be interpreted in relation to the fix interval used to collect the data. We used a multi-year, high-resolution data set from GPS collars with 2-hr fix intervals deployed on female caribou of the Teshekpuk Caribou Herd, Alaska, USA, 2006–2011, to examine the effect of fix interval on estimates of movement metrics. By calculating straight-line distances between locations taken at different fix intervals, we examined the rate of change in various metrics of caribou movement as a function of fix interval. We also calculated correction factors for different fix intervals, and examined how they changed seasonally. We fit an equation to the maximum rate of movement of caribou as a function of fix interval and used this equation in a modification of one screening algorithm to assess how it is affected by fix interval. We demonstrate how the maximum speed equation could potentially be used to derive a modified filter for telemetry data from highly mobile animals. Our results highlight the importance of incorporating fix-interval information into comparisons of movement metrics from different herds and time periods.
Bibliografie:istex:BFC20D187ACEBB232C1F7D5CDB0AE0B9E434C38B
ark:/67375/WNG-CBVTFQNP-S
ArticleID:WSB357
ISSN:1938-5463
2328-5540
1938-5463
2328-5540
DOI:10.1002/wsb.357