Accessing Accuracy of a Radiotelemetry System for Estimating Animal Locations

Lee, J. E.; White, Gary C.; Garrott, Robert A.; Bartmann, Richard M.; Alldredge, A. W.

doi:10.2307/3801690

Cited by 87 publications

(54 citation statements)

References 4 publications

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“…However, radio signals are affected by a variety of environmental factors such as vegetation, rocks and water bodies which absorb, refract or reflect a signal (Lee et al 1985, Swain & Bishop-Hurley 2007. To test whether the mean RSSI can be used to differentiate between close-range and long-range encounters, we compared logged RSSI values with estimated distances of simultaneously visually-observed encounters.…”

Section: Validation Of Field Datamentioning

confidence: 99%

Proximity loggers on amphibious mammals: a new method to study social relations in their terrestrial habitat

Meise

Krüger²,

Piedrahíta³

et al. 2013

Aquat. Biol.

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Amphibious mammal species alternate between foraging at sea and attendance on land. Due to thermoregulatory requirements, they often haul out during the night, making social interactions difficult to observe. We tested the suitability of UHF-proximity loggers for assessing social relationships among Galápagos sea lions Zalophus wollebaeki. To survive periods at sea, proximity loggers were embedded in epoxy. Automatic downloads to receiving stations rendered logger recovery unnecessary. Encounters were logged within a range of 10 m. Logs provided information about interacting individuals as well as time and duration of encounters. 'Received signal strength indicator' values correlated with distance, but were influenced by antenna angle and environmental factors. Laboratory tests and validation in the field demonstrated that the spatial resolution corresponded to 2 m. Data needed to be corrected, as single encounters were recorded as multiple logs and reciprocity of loggings between animals was not always achieved. Digital data correlated with observational data, but associations were 4 times more likely to be detected using proximity loggers. Data revealed that non-territorial males frequently associated for extended periods of time, especially during the night and even outside the study colony. The modified proximity logger system proves an excellent tool to determine social structure in situations where direct observation is limited. KEY WORDS: Amphibious species · Proximity logger · Social structureResale or republication not permitted without written consent of the publisher AQUATIC BIOLOGY

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Section: Validation Of Field Datamentioning

confidence: 99%

Proximity loggers on amphibious mammals: a new method to study social relations in their terrestrial habitat

Meise

Krüger²,

Piedrahíta³

et al. 2013

Aquat. Biol.

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“…Bearings and locations collected using radio telemetry are subject to error (White and Garrott, 1990;Lee et a/., 1985). Sources of variation and bias are numerous and include equipment imprecision, compass inaccuracy, observer variability, meteorological disturbances (Saltz and Alkon, 1985;Springer, 1979), and signal bounce from geographic features (Golightly, pers.…”

Section: Error Accuracy and Samplingmentioning

confidence: 99%

“…The bearing estimated by an observer (0') will be the sum of error (e) and the true bearing (0) (Lee, et al, 1985).…”

Section: Error Accuracy and Samplingmentioning

confidence: 99%

Effects of Low-Altitude Aircraft Overflights on the Desert Kit Fox (Vulpes macrotis arsipus) and its Small Mammal Prey on the Barry M. Goldwater Air Force Range, Arizona, 1991-1994

Bowles¹,

Francine²,

Yaeger³

et al. 1995

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Devis Highway, Suite 1204, Arlington, VA 222024302, and to the Office of Management and Budget, Paperwork Reduction Project (07040188), Washington, DC 20503. AGENCY USE ONLY (Leave blank)2. REPORT DATE February 1995 REPORT TYPE AND DATES COVEREDFinal -November 1990 to February 1995 TITLE AND SUBTITLEEffects of Low-Altitude Aircraft Overflights on the Desert Kit Fox (Vulpes macrotis arsipus) and its Small Mammal Prey on the Barry M. Goldwater Air Force Range, Arizona, 1991-1994 Ann E. Bowles,%hn Francine,*Samantha Wisely,*! Scott Yaegef*;*Lee McClenaghan Approved for public release; distribution is unlimited. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Hubbs 12b. DISTRIBUTION CODE ABSTRACT (Maximum 200 words)There has been public concern that wildlife could be affected by military training activities. Of particular interest was the hypothesis that noise from military aircraft would disrupt the ecological balance between predator and prey by giving one or the other an advantage. To gauge these effects, this study was conducted under an Air Force Range in an area receiving levels of exposure higher than normally encountered under a Military Training Route. A nearby control site was exposed to much lower levels of noise. Noise monitors recorded actual exposure, and hearing of one heteromyid species, the kangaroo rat, was measured in situ. A total of 14,455 trap-nights were spent monitoring nocturnal small mammal communities on exposed and control plots. Rodent species diversity, numbers, reproductive activity, recruitment, mean weights, and survival were measured. The kit fox, a predator, was also examined. Although differences were uncovered between kit fox and smal mammal populations between the control and exposed areas, none was large, and none was at odds with the most parsimonious natural explanations. If the effects observed are assumed to be the result of aircraft noise exposure, the consequences to rodents and fox populations were smaller in magnitude than the natural variability observed during the course of the study.14. SUBJECT TERMS acoustics, noise effects, noise impacts, ecological balance, desert kit fox Reproductive activity in male (top) and female (bottom) Chaetodipus penicillatus on exposed and control plots on the Barry M. Goldwater Air Force Range, Arizona. ... 81 igure 5-10 Seasonal rates of recruitment for Dipodomys merriami on exposed and control plots on the Barry M. Goldwater Air Force Range, Arizona 82 igure 5-11 Seasonal rates of recruitment for Perognath...

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“…The source of most errors is the location of the transmitter relative to the receiving system (Chu and others 1989, Lee andothers 1985, Springer 1979). Storm (1965) found that locations on flat ground up to 400 meters away are accurate to within 16 meters, but when the receiver and the transmitter are separated by ridges, the error increases to 96 meters.…”

Section: Quality Controlmentioning

confidence: 99%

“…Two factors affecting the size and shape of the error polygon and the accuracy of the location are the system precision and the location of the transmitter relative to the receiving system (Lee and others 1985, Springer 1979). The system precision is affected by the equipment, observers, and telemetry techniques.…”

Section: Sources Of Errormentioning

confidence: 99%

Radio telemetry methods for studying spotted owls in the Pacific Northwest.

Guetterman¹,

Burns²,

Reid³

et al. 1991

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The paper is a practical guide to field methodology for conducting a radio telemetry study of spotted owls (Strix occidentalis) in mountainous terrain. It begins with a synopsis of spotted owl biology and basic telemetry. The criteria used to select which owls will carry transmitters are discussed as are location and capture methods. Instructions for attaching transmitters and recommendations for general, night, and aerial telemetry are presented. Suggestions are given for controlling data quality, for researcher training and safety, and for field interpretation of radio signals. Equipment needs and license and permit requirements are also discussed.Keywords: Radio telemetry, Strix occidentalis, spotted owl, Pacific Northwest, methods. Introduction Spotted Owl Biology SizeThe development of radio telemetry equipment in the early 1960s enabled biologists to study the behavior of secretive animals. Cochran and Lord (1963) describe an early telemetry system. Radio telemetry was rapidly adopted as a technique for studying home range and habitat use. Storm (1965), for example, used radio telemetry to study red foxes (Vulpes vulpes). Advances in miniaturization of electronic components allow biologists to study even small animals with minimal effects on the animals.The spotted owl (Strix occidentalis) has been successfully studied with radio transmitters (Alien and Brewer 1985; others 1988,1989, in press; Forsman and others 1984;Forsman and Meslow 1985; Gutierrez and others 1985;Miller and Meslow 1985). Researchers are using radio telemetry to estimate the total area over which an owl roams, how the owls use the habitat types, the relation between the mix of habitat types and total home range size, regional variation in home range size, breeding behavior, and intraspecific and interspecific interactions. In addition, radio telemetry is being used to determine temporal and spatial movements of owls.The first step in designing a radio telemetry study is to formulate a well-defined, specific set of objectives reflecting a careful review of the literature and specific questions about the biology of the organism to be studied. The objectives dictate the experimental design and sampling plan. We are currently involved in a study of the home range and habitat use of about 50 spotted owls in five landscapes (Carey and others 1988). The experimental design reflects objectives of estimating population parameters for home-range size and habitat selection and determining how these parameters change with landscape type and composition. The sampling plan we follow was based on a pilot study that provided an optimal sampling schedule for our specific objectives (Carey and others 1989). Additional advice on experimental design and sampling is provided by Dunn and Gipson (1977), Johnson (1980), MacDonald and others (1980), Neu and others (1974), Slade (1985,1986), and White and Garrott (1986).The authors have combined experience in radio telemetry of 15 years. Most of us have been tracking spotted owls for 2.5 years, and one of ...

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Accessing Accuracy of a Radiotelemetry System for Estimating Animal Locations

Cited by 87 publications

References 4 publications

Proximity loggers on amphibious mammals: a new method to study social relations in their terrestrial habitat

Proximity loggers on amphibious mammals: a new method to study social relations in their terrestrial habitat

Effects of Low-Altitude Aircraft Overflights on the Desert Kit Fox (Vulpes macrotis arsipus) and its Small Mammal Prey on the Barry M. Goldwater Air Force Range, Arizona, 1991-1994

Radio telemetry methods for studying spotted owls in the Pacific Northwest.

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