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Open AccessArticle

Movement and Home Range of the Smooth Softshell Turtle (Apalone mutica): Spatial Ecology of a River Specialist

1
Illinois Natural History Survey, Champaign, IL 61820, USA
2
Illinois Department of Natural Resources, Springfield, IL 62702, USA
*
Author to whom correspondence should be addressed.
Diversity 2019, 11(8), 124; https://doi.org/10.3390/d11080124
Received: 27 June 2019 / Revised: 22 July 2019 / Accepted: 24 July 2019 / Published: 26 July 2019
(This article belongs to the Special Issue Advances in the Biology and Conservation of Turtles)
Spatial ecological information is necessary to guide the conservation efforts of river turtles, but it is lacking for many species including the smooth softshell turtle (Apalone mutica). We investigated the spatial ecology of A. mutica in two reaches of the Kaskaskia River in Illinois, USA to determine variables influencing movement rates, the best estimate of home range, and variables influencing home range size. We radio-tracked 28 A. mutica from 2013 to 2014 and used an information theoretic approach to select the best models describing movement and home range estimates. Mean movement rate was 142.3 m/day and was highly variable with some movements >2 km/day. Movement peaked at moderate water temperatures early in the active season, increased at higher water levels for females, and was greater in the higher stream order. The sexes responded differently to environmental variation, with female movement higher in most but not all conditions. The most informative home range estimate was a 95% kernel density estimate using likelihood cross-validation (CVh) smoothing clipped to the river channel. The mean home range size was 18.1 hectares and increased with movement rate, number of radio-locations, and stream order. Most turtles had well-defined home ranges, though a few were possibly nomadic. Our methods also provide a framework for spatial ecological studies of other riverine species. View Full-Text
Keywords: smooth softshell turtle; Apalone mutica; herpetology; spatial ecology; movement; home range; conservation; river smooth softshell turtle; Apalone mutica; herpetology; spatial ecology; movement; home range; conservation; river
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Ross, J.P.; Bluett, R.D.; Dreslik, M.J. Movement and Home Range of the Smooth Softshell Turtle (Apalone mutica): Spatial Ecology of a River Specialist. Diversity 2019, 11, 124.

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