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New GPS technology improves fix success for large mammal collars in dense tropical forests

Published online by Cambridge University Press:  01 March 2009

Mathias W. Tobler
Mathias W. Tobler*
Affiliation:
Andes to Amazon Biodiversity Program, Botanical Research Institute of Texas, 500 E 4th Street, Fort Worth, TX, 76102, and Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX, 77843, USA
*
1Corresponding author. Email: matobler@brit.org
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Extract

There have been few telemetry studies on large and medium-sized mammals from Neotropical lowland forests. This can partly be explained by the difficulty of tracking animals with radio-telemetry in these forests, often in remote areas with poor access due to limited transportation infrastructure. Researchers have been forced to follow their collared animals by aeroplane (Crawshaw 1995, Fragoso 1998, Rabinowitz & Nottingham 1986), but aerial telemetry is dangerous and involves difficult logistics and high costs. GPS (Global Positioning System) collars that allow the collection of data automatically at long intervals would be a good alternative. The effect of canopy cover on GPS fix success and location accuracy was of concern from the beginning and has been widely investigated in temperate forests (D'Eon 2003, Di Orio et al. 2003, Dussault et al. 1999, Moen et al. 1996, Rempel et al. 1995). All studies found a significant decrease in fix success and a large increase in location errors under forest canopy. Tropical lowland rain forests have a much denser canopy than temperate forests, and up to now the performance of GPS collars in tropical forest has been very poor. Rumiz & Venegas (2006) showed that while GPS collars worked in the dry forest of the Bolivian Chaco, they only obtained a successful fix in 1–3% of all attempts in the lowland forest of the Madidi National Park, Bolivia.

Keywords

Amazondata screeningfix successGPS collarlocation errortapirtracktag
Type
Short Communication
Information
Journal of Tropical Ecology , Volume 25 , Issue 2 , March 2009 , pp. 217 - 221
Copyright
Copyright © Cambridge University Press 2009

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