A Radio-Tracking System for Wild Animals

Cochran, William W.; Lord, Rexford D.

doi:10.2307/3797775

Cited by 228 publications

(106 citation statements)

References 4 publications

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“…We monitored female lesser prairie-chickens fitted with VHF radio transmitters regularly (i.e., N 3 times • week ) via triangulation to record telemetry locations (Cochran and Lord, 1963). Location of a Signal (Ecological Software Solutions, Naples, FL) software was used to estimate Universal Transverse Mercator coordinates from VHF data collected in the field.…”

Section: Field Methodsmentioning

confidence: 99%

Age‐Specific Survival and Probable Causes of Mortality in Female Lesser Prairie‐Chickens

et al. 2007

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Long‐term population declines and habitat reductions have increased concern over the status of the lesser prairie‐chicken (Tympanuchus pallidicinctus). Robust estimates of demographic parameters are essential for identifying population declines and planning effective management. We evaluated the effects of age and season on the survival of female lesser prairie‐chickens at 2 sites in southwestern Kansas, USA. Using telemetry data from a 7‐year field study (from 1997 to 2003), we estimated seasonal (Apr—Sep) and annual (Apr—Mar) survival. We also examined daily survival rates of females attending nests during the 26‐day incubation period and young during the 14‐day early brood‐rearing period. We evaluated the probable mortality causes of radiomarked birds by examining evidence at recovery sites. We captured 227 female lesser prairie‐chickens (87 yearlings, 117 ad, and 23 age undetermined) and fitted them with radiotransmitters. Estimates of 12‐month survival were lower among yearlings (Ŝ12 = 0.429, SE = 0.117) and adults at site I (Ŝ12 > = 0.302, SE = 0.080) than among yearlings (Ŝ12 = 0.588, SE = 0.100) and adults at site II (Ŝ12 > = 0.438, SE = 0.083). The patterns in timing of mortality and age‐specific 6‐month survival were consistent with those of 12‐month estimates at site I from 1998 to 2002, with a peak in mortality during May and June. Females tending to nests or to prefledged chicks had lower daily survival (DŜRtend = 0.993, SE = 0.001) than females not involved in these activities (DŜRfailedbreeder = 0.997, SE = 0.002). We recorded 92 mortalities from April 1997 to March 2003, and 59% and 11% were attributed to predation by mammals and raptors, respectively. Our research suggests that predation during the nesting season can have a major impact on lesser prairie‐chicken demography, and conservation efforts should focus on enhancing female survival during the nesting and brood‐rearing seasons.

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Section: Field Methodsmentioning

confidence: 99%

Age‐Specific Survival and Probable Causes of Mortality in Female Lesser Prairie‐Chickens

et al. 2007

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“…Radio-telemetry technology and tracking methods for studying the behaviour and ecology of wild animals have advanced significantly since radio telemetry was first used in the 1960s [1]. Initially very high frequency (VHF) radio devices were used for wildlife tracking, which were limited to a range of only a few kilometres.…”

Section: Introductionmentioning

confidence: 99%

Three decades of wildlife radio telemetry in India: a review

et al. 2014

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From 1983, there have been three decades of the application and development of radio telemetry for wildlife studies in India. In this article, we review 82 studies from India, covering 47 species from four taxonomic classes. We examine and discuss the trends in the selection of study species, habitats and objectives of radio-telemetry studies and the functional success of radio collars and tags. A strong bias for study species and study region is observed and researchers generally tend not to look beyond the traditional research questions. Habitats that are difficult to access, such as the Trans-Himalayas, the Himalayas and north-eastern India, are overlooked. Most of the studies aimed to infer primary information only, such as home range, migration and movement patterns and habitat preference (53.7%, 47.6% and 28.1% studies, respectively). We expect these trends to change with time as the development of technology allows researchers to explore further. We investigated the tracking histories of 483 animals and the records of 496 radio collars or tags, but detailed information could be acquired for only 330 collars or tags. Of the collars, 49% malfunctioned before the end of their anticipated life due to a variety of reasons, early battery drainage being the prevalent cause. The performance of different technologies and collar manufacturers was also analysed but the small sample size was an issue for most of the cases. Argos-based collars and tags generally failed to record most of the locations precisely and failed to transmit them successfully. Issues with permissions and capturing animals for tagging, particular to India, are also discussed. A uniform and centralized system for granting permissions and guidelines for capturing and handling animals would be beneficial to future telemetry studies.

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“…princeton.edu/~wikelski/research/index.htm). The ARTS uses automated receivers (Sparrow Systems) to scan radio signal strengths of six stationary antennae mounted on an abovecanopy tower, and determine bearings to radiocollared animals (Cochran andLord 1963, Larkin et al 1996). We recorded a bearing to each animal every minute.…”

Section: Methodsmentioning

confidence: 99%

Predispersal home range shift of an ocelot Leopardus pardalis (Carnivora: Felidae) on Barro Colorado Island, Panama

Marés¹,

Moreno²,

Kays³

et al. 2007

RBT

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Abstract:Home range shifts prior to natal dispersal have been rarely documented, yet the events that lead a subadult to abandon a portion of its home range and venture into unfamiliar territories, before eventually setting off to look for a site to reproduce, are probably related to the causes of dispersal itself. Here, we used a combination of manual radio-tracking and an Automated Radio Telemetry System to continuously study the movements of a subadult male ocelot (Leopardus pardalis), a solitary carnivore with sex-biased dispersal, on Barro Colorado Island, Panama, for 18 months from May 2003 through October 2004. The subadult ocelot's parents were also radio-tracked to record possible parent-offspring interactions within their home ranges. At the age of ca. 21 months the subadult gradually began to shift its natal home range, establishing a new one used until the end of the study, in an area that had previously been used by another dispersing subadult male. Only three parent-offspring interactions were recorded during the four months around the time the range-shift occurred. The apparent peaceful nature of these encounters, along with the slow transition out of a portion of his natal home range, suggest the subadult was not evicted from his natal area by his parents. The timing of the shift, along with the subadult's increase in weight into the weight range of adult ocelots four months after establishing the new territory, suggests that predispersal home range shifts could act as a low risk and opportunistic strategy for reaching adult size, while minimizing competition with parents and siblings, in preparation for an eventual dispersal into a new breeding territory. Rev. Biol. Trop. 56 (2): 779-787. Epub 2008 June 30.

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A Radio-Tracking System for Wild Animals

Cited by 228 publications

References 4 publications

Age‐Specific Survival and Probable Causes of Mortality in Female Lesser Prairie‐Chickens

Age‐Specific Survival and Probable Causes of Mortality in Female Lesser Prairie‐Chickens

Three decades of wildlife radio telemetry in India: a review

Predispersal home range shift of an ocelot Leopardus pardalis (Carnivora: Felidae) on Barro Colorado Island, Panama

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