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Holm, P., & Wirt, E. , Growth and seasonal activity of arizona mud turtles (kinosternon arizonense) in western pima county, arizona - abstract. Unpublished paper presented at Program and Abstracts of the Tenth Annual Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles. 
Added by: Admin (06 Jan 2014 18:22:52 UTC)
Resource type: Conference Paper
BibTeX citation key: Holm2012
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Categories: General
Keywords: Habitat - habitat, Nordamerika - North America, Schildkröten - turtles + tortoises
Creators: Holm, Wirt
Collection: Program and Abstracts of the Tenth Annual Symposium on the Conservation and Biology of Tortoises and Freshwater Turtles
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Abstract     
North of Mexico, the Arizona Mud Turtle inhabits much of the Tohono O’odham Nation and a few sites on adjacent lands. Little is known about this species in the Lower Colorado Valley Desert scrub of southwestern Arizona. No K. arizonense have been observed at Quitobaquito Springs in Organ Pipe Cactus National Monument, since a mating pair was observed there in 1955, despite frequent sampling of Sonoyta Mud Turtles (K. sonoriense longifemorale) in recent decades. In 2009, we discovered a K. arizonense population in a 0.4 ha livestock pond in the Valley of the Ajo and initiated a study now comprised of 65 individuals using standard mark-recapture techniques. Lincoln-Peterson estimates were 41 (SE = 7) for 2010, and 74 (SE = 13) for 2011. In 2010, 18 of 36 turtles had a carapace length measuring less than 100mm, including 3 young of year measuring 24 to 29mm (4 to 7g); only 1 of 51 turtles measured less than 100mm in 2011. The largest individuals captured included 4 males 158 to 173mm (619 to 841g) and 6 females 156 to 165mm (571 to 680g). There was a conspicuous gap in the size distribution between 137mm (373g) and 156mm (571g) among the combined data. Excluding the largest individuals, growth ranged from 0 to 2mm (average 1.2, N=3) between 2009 and 2010, and from 0 to 20mm (average 13.5, N=14) between 2010 and 2011. Within season growth in 2011 ranged from 26 to 182mm per year (average 70.8, N=15) suggesting that turtles were active for a physiological equivalent of 10 weeks for the entire year. Additional morphometric data are needed to determine if the gap in size distribution is a bottleneck in recruitment or spike in growth rate, and before sex can be determined for intermediate size classes.
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