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Activity and movement of free-living box turtles are largely independent of ambient and thermal conditions

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Parlin_2-npx10mp3zrns8.pdf
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2018

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Parlin, Adam F.
Nardone, Jessica A.
Kelly Dougherty, John
Rebein, Mimi
Schaeffer, Paul J.

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Published

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Movement Ecology. BioMed Central. 2018, 6, 12. eISSN 2051-3933. Available under: doi: 10.1186/s40462-018-0130-8

Zusammenfassung

Background
Ectotherms are assumed to be strongly influenced by the surrounding ambient and environmental conditions for daily activity and movement. As such, ecological and physiological factors contribute to stimuli influencing navigation, extent of movement, and therefore habitat use. Our study focused on the intensity of activity (from acceleration data) and extent of movement (from GPS and thread trailing data) of Eastern box turtles (Terrapene carolina carolina) in a fragmented landscape near their northern population limit. First, we quantified the thermal performance curve of box turtles using activity as a measure of performance. Second, we investigated ecological factors that could influence activity and movement and characterized the movement as extensive (exploration) and intensive (foraging).

Results
In contrast to previous lab work investigating effects of temperature on activity, we found no relationship between box turtle activity and temperature in the field. Furthermore, box turtle activity was consistent over a wide range of temperatures. Cluster analysis categorized movement recorded with GPS more as intensive than as extensive, while thread trailing had more movement categorized as extensive than intensive. Box turtle activity was higher during the morning hours and began to decrease as the day progressed. Based on the microclimate conditions tested, we found that box turtle movement was influenced by precipitation and time of day, and activity was most influenced by absolute humidity, ambient temperature, cloud cover, and time of day.

Conclusions
Our model ectotherm in this study, the Eastern box turtle, had activity patterns characteristic of a thermal generalist. Sampling resolution altered the characterization of movement as intensive or extensive movement, possibly altering interpretation. More information on the resolution needed to definitively identify foraging and exploratory behavior in turtles is needed. Activity and movement were nearly independent of environmental conditions, which supports the overall interpretation that turtle performance is that of a broad environmental generalist. Future studies of movement of other turtle and reptile species are needed to determine the generality of these findings.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
570 Biowissenschaften, Biologie

Schlagwörter

Daily activity, Ecophysiology, Overall dynamic body acceleration, Resolution

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ISO 690PARLIN, Adam F., Jessica A. NARDONE, John KELLY DOUGHERTY, Mimi REBEIN, Kamran SAFI, Paul J. SCHAEFFER, 2018. Activity and movement of free-living box turtles are largely independent of ambient and thermal conditions. In: Movement Ecology. BioMed Central. 2018, 6, 12. eISSN 2051-3933. Available under: doi: 10.1186/s40462-018-0130-8
BibTex
@article{Parlin2018Activ-51767,
  year={2018},
  doi={10.1186/s40462-018-0130-8},
  title={Activity and movement of free-living box turtles are largely independent of ambient and thermal conditions},
  volume={6},
  journal={Movement Ecology},
  author={Parlin, Adam F. and Nardone, Jessica A. and Kelly Dougherty, John and Rebein, Mimi and Safi, Kamran and Schaeffer, Paul J.},
  note={Article Number: 12}
}
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