North Fort Myers, AZ, United States
North Fort Myers, AZ, United States

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Sullivan B.K.,Arizona State University | Averill-Murray R.,Nongame Branch | Averill-Murray R.,U.S. Fish and Wildlife Service | Sullivan K.O.,Arizona State University | And 4 more authors.
Chelonian Conservation and Biology | Year: 2014

Little is known regarding the activity of desert tortoises during winter, especially for the Sonoran Desert Tortoise (Gopherus morafkai). We observed adult, juvenile, and hatchling G. morafkai active during November, December, January, and February at 3 field sites in upland Sonoran Desert in central Arizona. At 1 site all individuals under observation (n=36), including males, females, and hatchlings, emerged from hibernacula to drink during the first heavy (>20 mm) rainfall event (December); at all 3 sites, females were observed active (basking, foraging) during winter much more frequently than were males. © 2014 Chelonian Research Foundation.

Anthony T.,Missouri State University | Anthony T.,J Sargeant Reynolds Community College | Riedle J.D.,Environmental Planning Group | East M.B.,University of New Mexico | And 2 more authors.
Chelonian Conservation and Biology | Year: 2015

Reintroduction is a common management tool for conserving imperiled species, but many reintroductions have included little or no postrelease assessment of project success. The alligator snapping turtle (Macrochelys temminckii) is a long-lived species that has experienced significant declines throughout its range, although suitable habitat remains. We report the findings of a reintroduction effort that was initiated in 2008 near the northwestern limit of the species' range. Two hundred forty-six M. temminckii were released into the Caney River and its tributary, Pond Creek, from 2008 to 2010. All turtles exhibited measurable growth by their first recapture 1-3 yrs after release, and no decline in body condition was observed, either in comparison to prerelease body condition or to the condition of animals in the same cohorts that remained in captivity. Apparent survival and recapture probabilities increased with age. Apparent survivorship values were higher for turtles released in the main channel of the Caney River, but recapture probabilities were higher in its tributary. Ultimately, survivorship values may have been influenced by low recapture rates and emigration, in addition to mortality. © 2015 Chelonian Research Foundation.

Munscher E.C.,SWCA Environmental Consultants | Walde A.D.,Walde Research and Environmental Consulting | Riedle J.D.,Environmental Planning Group | Kuhns E.H.,University of Florida | And 2 more authors.
Chelonian Conservation and Biology | Year: 2015

The Florida softshell turtle, Apalone ferox (Schneider 1783) is considered common and easily visible in many freshwater habitats throughout its range. However, very little population research has been completed on the species due to difficulties associated with capture and long-term marking. We have conducted a mark-recapture study of this species since 2007 as part of a long-term freshwater turtle population monitoring program at Wekiwa Springs State Park, Apopka, Florida. From 2007 to 2012 we captured 56 individual Florida softshell turtles with 101 total captures. The malefemale ratio was 12.6 and females were larger than males. Population estimates were 92 adults and 49 juveniles with a total estimate of 141 Florida softshell turtles in the 2.67-ha study site. Our data from a protected population centrally located within the species range provide a baseline for comparison to other populations. © 2015 Chelonian Research Foundation.

Germano D.J.,California State University, Bakersfield | Riedle J.D.,Environmental Planning Group
Herpetologica | Year: 2015

Western Pond Turtles (Actinemys Emys marmorata) occur in habitats ranging from large rivers and reservoirs to small streams and ponds, as well as from sea level to about 2000-m elevation. This range of environments can affect population parameters such as body size, growth rates, survivorship, and reproductive output. We marked 321 individuals in 287 trap-days in 2007 and 2010 at a high-elevation pond on the southern flank of the Tehachapi Mountains in Southern California, USA. The population was female-biased (92 F:78 M in 2007, 113 F:60 M in 2010), and estimated to contain 412 individuals. Growth rates were relatively high compared with other populations of A. marmorata. Monthly survivorship was 0.989-1.000 for adults and juveniles and s values denoted a stable population. Clutch size averaged 6.3 eggs, and we found 22 instances of intra-annual double-clutching, and possibly a third clutch for one female. Population traits of turtles at this high-elevation pond differed little from turtles at lower elevation sites at the same latitude. Despite conservation threats to this species, this population is indicative that A. marmorata can survive well in small habitats, many of which are human-created, and this has increased the amount of habitat for the species as other natural areas have been eliminated. © 2015 by The Herpetologists' League, Inc.

Pasenko M.R.,Environmental Planning Group | Agenbroad L.D.,Mammoth Site of Hot Springs
Southwestern Naturalist | Year: 2012

A collection of large mammals was recovered from Pleistocene sediments in the Prescott Valley, Yavapai County, Arizona, during an excavation in 1984. We described specimens of Mammuthus cf. columbi, Equus cf. conversidens, Camelops, and Bison from this locality. These are the first reported occurrences of E. conversidens and Camelops in Yavapai County. The mammoth and horse were subadults and the bison and camel were juveniles. Excellent preservation of the mammoth indicated a rapid burial and comparisons to other mammoths suggested the individual was a small male. A radiocarbon date of 13,410 years before present, from fluvio-lacustrine sediments encasing the mammoth, provided a late Pleistocene age for the fauna. The grazing nature of this fauna indicates prevalent grasslands during the end of the Pleistocene in Prescott Valley.

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