Translocating Red Wolves Using a Modified Soft-Release Technique
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McLellan and Rabon Translocating red wolves Canid News Copyright © 2006 by the IUCN/SSC Canid Specialist Group. ISSN 1478-2677 The following is the established format for referencing this article: McLellan, S.R. and Rabon, D.R. 2006. Translocating red wolves using a modified soft-release technique. Canid News 9.1 [online] URL: http://www.canids.org/canidnews/9/Translocating_red_wolves.pdf. Field Report Translocating red wolves using a modified soft-release technique Scott R. McLellan1 and David R. Rabon, Jr.2 1 Maine Department of Inland Fisheries and Wildlife, 650 State Street, Bangor, ME 04401, USA. E-mail: [email protected] 2 Correspondence author: United States Fish and Wildlife Service, Post Office Box 33726, Raleigh, NC 27636-3726, USA. E-mail: [email protected] Keywords: acclimation pen, Canis rufus, electrified corral, soft release, translocation Abstract Introduction Intensive management of the reintroduced red The red wolf once occurred throughout the wolf Canis rufus population in northeastern mid-Atlantic and southeastern United States North Carolina (USA) is required, in part, to (Nowak 2002). The species was extirpated limit introgression of coyote Canis latrans from most of its former range by the early part genes through red wolf-coyote mating. To of the 20th Century, primarily by predator con- reduce these matings, and to enhance the red trol activities and changes in land use (Nowak wolf population, the Red Wolf Recovery Pro- 1972). The red wolf was listed as endangered gram released wolf pairs or solitary wolves in the United States in 1967 (USFWS 1967) and into vacant areas or areas previously occupied was one of the first species to attract recovery by a coyote or wolf-coyote hybrid. Five male- attention. In the mid 1970s, the U.S. Fish and female wolf pairs and four solitary wolves Wildlife Service began capturing the few re- were held in a central captive facility (for 17-64 maining wild wolves to initiate a captive days), then subsequently in a portable, electri- breeding program. The ultimate goal of the fied corral (for 11-24 days), before being re- program was to restore the red wolf into por- leased. Following release, three of five pairs tions of its former range (USFWS 1990). That established a territory in the vicinity of the goal was realized in 1987 when four male- acclimation/release site and defended it from female adult pairs of captive-born red wolves other canids; however, only one of four soli- were successfully released on Alligator River tary wolves paired with a mate and defended National Wildlife Refuge (NWR), North Caro- the area from other canids. Three of five un- lina (Parker 1987a; Parker and Phillips 1991). successful release events ended with the wolves being killed while homing to their Although the red wolf remains listed as Criti- original capture site. cally Endangered (IUCN 2003), the restoration efforts show signs of success. In 2005, ap- proximately 100 red wolves in 20 packs inhab- 1 McLellan and Rabon Translocating red wolves ited more than 6,000km2 of public and private cosin, and pond pine Pinus serotina woodland lands in northeastern North Carolina. Inten- communities (Shafale and Weakley 1990). Ag- sive management of the red wolf population is ricultural cropland, primarily soybean, corn, required, however, to reduce wolves breeding cotton, and wheat (USDA 2004), and timber- with the coyote, which recently expanded its land forests of loblolly-shortleaf pine and oak- range into North Carolina (DeBow et al. 1998). gum-cypress (Brown 2004) predominate the Since the initial 1987 red wolf release, the free- area. Approximately 27% of the land is owned ranging population has been augmented by and managed by the federal and state gov- releasing captive-born wolves (Phillips 1994), ernments as four national wildlife refuges and wild-born wolves from island propagation 12 state game lands. sites (Parker 1987b) and, more recently, by fostering captive-born pups into wild-born Study animals litters (Waddell et al. 2002). The Red Wolf Re- covery Program also attempted to reduce Fourteen wild-born red wolves (6 males:8 fe- wolf-coyote matings and enhance and expand males) were used in the study. Seven (2:5) of the red wolf population by releasing wild- the animals were born and reared in the wild born wolves into areas vacant of wolves, into within the experimental population area (i.e. areas containing potential mates (i.e. solitary residents), and five wolves were born and wolves), or to replace coyote or wolf-coyote reared at island propagation sites: (2:2) Bulls hybrids (Kelly et al. 1999). Island in Cape Romain NWR, South Carolina and (1:0) St. Vincent NWR, Florida (Henry et The Red Wolf Recovery Program has made al. 1995). Two sibling wolves (1:1) were wild- use of hard- and soft-release methods to re- born in the Great Smoky Mountains National store wolves. Soft-release methods typically Park (GSMNP), Tennessee (Parker 1990), but include the construction of a semi-permanent were transferred to the captive facility at Alli- enclosure (e.g. chain-linked fence) to acclimate gator River NWR (hereafter referred to as the animal(s) to the surroundings prior to re- Sandy Ridge) when they were seven months lease, and generally increase the likelihood of of age. The mean age at time of release was a successful release when compared to hard- 26.3 + 2.8 SE months (range 17 to 35) for males release methods (Fritts 1993, but see Phillips et and 29.1 + 6.1 SE months (range 20 to 71) for al. 2003). However, construction of a fixed females. The study wolves were not known to fence enclosure can be costly, time consuming, have prior reproductive experience, unless destructive of native vegetation, and impracti- otherwise noted. Wolves were fitted with a cable in some remote locations or rugged ter- radio (VHF) telemetry collar (Model 315, 400, rain. or 500, Telonics, Inc., Mesa, AZ 85204-6699), and a transponder chip (Model EID-ID100, Herein we present details of nine, modified Eidap, Inc., Sherwood Park, Alberta, Canada soft-release events of translocated red wolves T8H 2M8) was inserted subcutaneously be- using a portable, electrified acclimation corral. tween the shoulders prior to being moved from Sandy Ridge. Methods Acclimation corral Study area A portable, electrified corral was used as an acclimation pen (Figure 2). The corral fencing The work was conducted in a five-county area was constructed of lightweight plastic and (Beaufort, Dare, Hyde, Tyrrell, and Washing- nylon mesh, approximately 2.3m high; the ton) in northeastern North Carolina desig- area (and shape) of the corral varied depend- nated as the red wolf experimental population ing on the location, but was generally 200m2. area (Figure 1) (USFWS 1995). This area is The lower 1.2m of fencing was nylon mesh largely rural, with few improved roads, and approximately 5cm by 10cm, with an inter- bounded by the Albemarle Sound to the north, woven 16-gauge wire for connection to an Roanoke and Pamlico Sounds to the east, and electrical current (Model ElectroStop, Premier the Pamlico River to the south. The natural 1 Supplies, Washington, IA 52353). communities of the area are characterized as non-riverine swamp forest, high and low po- 2 McLellan and Rabon Translocating red wolves Figure 1. Map of the red wolf experimental population area in North Carolina showing lands owned by federal and state governments. An additional electrified 16-gauge wire at ground level prevented animals from digging out of the corral. A solar-charged, battery- operated 12-volt fence charger (Model Parmak Solar Magnum Charger, Country Supply, Lou- isiana, MO 63353) provided electricity to the interwoven and digging wires. The upper portion of fencing was approximately 10cm by 15.25cm non-electrified, plastic mesh (Model Barrier Fencing, Forestry Supplies Inc., Jack- son, MS 39284). The plastic and nylon fencing were fastened together and to polyvinylchlo- ride (PVC) posts using cable ties, then secured to the ground with nylon ropes and stakes. Figure 2. A solitary, male red wolf (M1166) in the portable, electrified acclimation corral. Cost for the corral mesh was approximately US$250, and the solar-powered battery and fence charger approximately US$480. The PVC pipe and other miscellaneous supplies (e.g. rope, stakes, hammers) to construct the corral cost approximately US$300. The time 3 McLellan and Rabon Translocating red wolves required to construct the corral varied de- virginianus and/or commercially packaged pending on the number of people assisting, horse meat (Bravo Packing, Inc., Carney's but generally took less than eight hours. Dis- Point, NJ 08069 and Dallas Crown, Inc., Kauf- mantling the acclimation corral typically took man, TX 75142), was provided once or twice a less than two hours. After the initial set-up, week depending on weather and prior feeding the plastic and nylon fencing can be rolled and amount, and to minimize human disturbance. stored together to minimize the time required Uneaten food from the previous feeding was to construct the corral for future releases. removed from the site to limit attracting scav- engers. Two metal water tubs were placed Release sites inside the corral; water was available ad libi- tum. An inspection of the corral and, if possi- Release sites were selected based on known ble, a visual observation of each wolf was historical use by wild canids (i.e. red wolves, made during the feeding visit. Any repairs to coyotes, or wolf-coyote hybrids), habitat, and the corral fencing or digging wire were com- land ownership. Eight of the nine release pleted as quickly as possible; time spent at the events occurred on federally owned property corral was less than 20 minutes per visit.