Literaturdatenbank
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Tucker, C. R., Radzio, T. A., Strickland, J. T., Britton, E., Delaney, D. K., & Ligon, D. B. , Use of automated radio telemetry to detect nesting activity in ornate box turtles, terrapene ornata (poster). Unpublished paper presented at 2013 Box Turtle Conservation Workshop.
Added by: Admin (06 Jan 2014 18:25:26 UTC) |
| Resource type: Conference Paper BibTeX citation key: Tucker2013a View all bibliographic details  |
Categories: General Keywords: Emydidae, Fortpflanzung - reproduction, Habitat - habitat, Nordamerika - North America, Schildkröten - turtles + tortoises, Terrapene ornata Creators: Britton, Delaney, Ligon, Radzio, Strickland, Tucker Collection: 2013 Box Turtle Conservation Workshop |
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| Abstract |
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Researchers often employ radio telemetry to efficiently locate study animals, but the time required to locate individuals can make monitoring large populations difficult and costly. In 2010–2011, we located nesting ornate box turtles (Terrapene ornata) in a large group of radio-tagged animals. To minimize search efforts, we investigated whether automated radio telemetry and the signal change method could be used to identify nesting activity before locating animals. The signal change method relies on the principle that any movement of a radio transmitter, including minor changes in orientation, can strongly affect the intensity of the transmitter’s signal at a stationary receiving station. Using video recordings of free-ranging radio-tagged turtles, we confirmed that transmitter signal strength values can be analyzed to identify periods of box turtle activity. Early in the 2010 nesting season, automated telemetry observations indicated that some females engaged in nocturnal activity. Previous reports indicate that ornate box turtles often nest at night, but are otherwise inactive after dark. Based upon this information and relatively little indication of nocturnal activity by males, we hypothesized that nocturnal activity corresponded to nesting. We subsequently monitored female nighttime activity in near real time, hand-tracked 4 night-active individuals, and found 3 of these turtles nesting. In 2011, we again selectively hand-tracked night-active females and located nests for 12 of 18 study animals, which approximates the expected annual reproductive rate for our population. We demonstrate that the signal change method can be used to identify nesting activity in ornate box turtles and suggest this method may be of use in other species that nest outside of their normal activity periods.
Added by: Admin |