HERPETOFAUNA TEXT 40-1.2 3/3/11 2:20 PM Page 39 THE HERPETOFAUNA OF THE BIMBLE BOX-PINE WOODLANDS OF THE COBAR PENEPLAIN, WESTERN NSW Steven Sass1 and Gerry Swan2 1EnviroKey, PO Box 7231, Tathra, NSW 2550. Email: [email protected]. 2 Cygnet Consulting, 2 Acron Rd, St. Ives, NSW 2075. INTRODUCTION 1993; Henle, 1987; Olsson et al., 2005; Sass & Wilson, 2006; Schlesinger et al., 1997). The Cobar Peneplain is one of eighty biogeo- graphic regions identified in Australia (Thack- The aim of this paper is to document the her- way & Creswell, 1995) and lies within the petofauna that occur within bimble box-pine Central West of New South Wales, occupying woodlands of the Cobar Peneplain bioregion over 73,000 square kilometres, or approxi- from records of the authors and by conduct- mately one-tenth of the area of New South ing a review of previous literature relevant to Wales (NPWS, 2000). It includes parts of the this vegetation community. The conservation Western and Central Divisions, extending status of some species is also discussed. from near Bourke in the north, through to Griffith in the south, and includes the towns of METHODS Nymagee, Cobar, Nyngan, Condobolin and Lake Cargelligo. Only 2.49% of the bioregion The Cobar Peneplain region is well known to is protected by conservation reserves (NPWS, both authors, who have conducted numerous 2003). reptile surveys there since the 1980s. More specifically, six sites have been the subject of Currently the region largely supports dense extensive herpetofauna surveys on numerous shrub woodlands, with a shrubby understorey occasions, and their data provides an exten- or herbs and grasses (CVMC, 2006). The sive list of species identified over a wide most extensive vegetation community is variety of seasons, years and micro-environ- bimble box-pine woodland (Eucalyptus popul- mental conditions. These were at Yathong nea spp. bimblii – Callitris glaucophylla). Nature Reserve (BB1), Nombinnie Nature Throughout much of its range, bimble box- Reserve (Sass, 2006; BB2), 2 km north of pine woodland forms communities with Griffith (BB3), 5 km south of Nymagee (BB4), and/or intergrades with other species such as 50 km north of Cobar (BB5) and 50 km east red box (Eucalyptus intertexta), ironwood of Cobar (BB6) (Figure 1). This wide variation (Acacia excelsa), wilga (Geijera parviflora), in both environmental conditions and spatial belah (Casuarina cristata), rosewood (Alectry- distribution provides a comprehensive list of on oleifolius), leopardwood (Flindersia macu- herpetofauna species that have been record- losa) and, infrequently, brigalow (Acacia ed in this vegetation community within the harpophylla) (CVMC, 2006). bioregion. Each of the six locations was char- Despite bimble box-pine woodland being acterised by bimble box-pine woodland widespread, the paucity of published papers (Eucalyptus populnea spp. bimblii – Callitris on the herpetofauna in this vegetation com- glaucophylla) with scattered stands of red box munity suggests that little is known on distrib- (Eucalyptus intertexta). Lower shrubs were ution and status in the Cobar Peneplain dominated by budda (Eremophila mitchelli) Bioregion. Much of the knowledge of the her- and turpentine (Eremophila sturtii) whilst forbs petofauna of the region has been collected and grasses were dominated by native from within the mallee vegetation communi- species. ties of the southern and western portions Each study site was also characterised by dif- (Caughley, 1985; Cogger, 1969; Hallinger, ferent land management regimes. Of the six Herpetofauna 40 (1) 2010 Page 39 HERPETOFAUNA TEXT 40-1.2 3/3/11 2:20 PM Page 40 Figure 1. Location of the Cobar Peneplain Bioregion and the survey locations sites, two are nature reserves under the man- encourage non-calling frogs to respond at agement of the Department of Environment drainage lines, earthen tanks and domestic and Climate Change (DECC) (BB1, BB2), one water tanks. Not all methodologies were used site is crown land (BB3) and the remaining at every site. Opportunistic records were also three are on private property (BB4, BB5, BB6) collected by the authors while driving through (Figure 1). Data collected from these sites was this vegetation community before, during and undertaken using various methods including after surveys. pitfall traps using 20 L buckets and drift Searches were made of scientific journal fences, Elliot traps baited with a mixture of databases, the world-wide web, and other peanut butter, honey and rolled oats, system- relevant data where surveys have been atic searches where active animals were undertaken specifically in bimble box-pine located visually, while inactive animals were woodland to provide additional information located by lifting loose rocks, viewing hollow on the herpetofauna of the region. logs, searches of rock and tree crevices, old sheets of corrugated iron and leaf litter. Frog Discussions with land managers and farm species were identified by spotlighting, listen- workers were undertaken to determine addi- ing for calls and conducting call playback to Page 40 Herpetofauna 40 (1) 2010 HERPETOFAUNA TEXT 40-1.2 3/3/11 2:20 PM Page 41 tional species that may not have been brings the total number of species recorded in encountered during surveys. Due to the diffi- bimble-box pine woodlands to 40 species of culties that inexperienced people have in reptile and 11 species of frog (Table 2). identifying many species of reptile and frog, only species that are easily identified were DISCUSSION considered. The diverse landscape and vegetation of the Nomenclature and common names follow Cobar Peneplain bioregion is already known Swan et al. (2004) and Anstis (2002) except to support a wide variety of vertebrate fauna for Lerista muelleri and Crytoblepharus carn- species (NPWS, 2003). This study has identi- abyi. Lerista muelleri has recently been fied that the bimble box-pine woodlands of revised, and the species in New South Wales the bioregion support a high level of diversity is now Lerista timida (Hutchinson, 2008). of herpetofauna species with 51 species Similarly, the population previously assigned recorded to date (Table 2). to Cryptopblepharus carnabyi in inland New South Wales is now either Cryptoblepharus Five species of reptile (two species of lizard - pannosus or C. australis (Horner, 2007). As Ctenophorus pictus, Egernia modesta, and we have not been able to examine specimens three species of snake - Acanthophis antarcti- of Cryptoblepharus from the study sites since cus, Pseudonaja textilis, Vermicella annulata) these two species were described, all records and two species of frog (Crinia parinsignifera, have been grouped as Cryptoblepharus sp. in Uperoleia rugosa) were only recorded at this paper. single locations. Sadlier and Pressey (1994) reviewed the herpetofauna of western NSW and identified Egernia modesta and Acan- RESULTS thophis antarcticus as likely to be of conser- Collation of the authors' records identified a vation concern. total of 33 species of reptile and 10 species of Ctenophorus pictus is widespread through the frog within bimble-box woodlands of the region but is more usually associated with Cobar Peneplain Bioregion (Table 1). mallee/spinifex habitats or shrublands. The During our search of the literature, two large- single record occurred at BB5, and only one scale fauna studies were identified from individual was sighted. Rocky outcrops domi- within a large number of vegetation commu- nated the area where this individual was nities of the Cobar Peneplain bioregion sighted, which is unusual for this species. including bimble box-pine woodlands Despite additional searches, no further indi- (Masters & Foster, 2000; NPWS, 2001). These viduals were recorded. It is likely that this studies found 25 species of reptile and 8 species occurs only in very low abundance at species of frog within bimble-box pine wood- scattered bimble-box pine woodland loca- lands (Table 2). tions across the bioregion. Discussions with land managers and farm Egernia modesta is distributed through the workers during 2003 surveys at BB4 revealed northern tablelands south to the Hunter Valley the presence of three additional reptile and also on the north-west slopes. At the species: Morelia spilota metcalfei, Vermicella western limit of the species distribution isolat- annulata and Acanthophis antarcticus. All ed populations occur near Walgett and at three species are considered by the authors to Yathong Nature Reserve. The Yathong individ- be easily identifiable by persons unfamiliar uals were found on the Merrimerriwa Range with reptiles, and so it is with a high level of in 1980. Since then extensive field work in this accuracy that these data can be included. Reserve across a range of other habitats has failed to record further individuals of E. The inclusion of data from all of these sources modesta, and it would appear it is most likely Herpetofauna 40 (1) 2010 Page 41 HERPETOFAUNA TEXT 40-1.2 3/3/11 2:20 PM Page 42 Table 1. Reptiles and frogs recorded by the authors in bimble box-pine woodland of the Cobar Peneplain. BB1 = Yathong NR, BB2 = Nombinnie NR, BB3 = Griffith, BB4 = Nymagee, BB5 = Cobar, BB6 = Hermidale (* = recorded by authors, A = anecdotal record). Scientific name Common name BB1 BB2 BB3 BB4 BB5 BB6 REPTILIA Gekkonidae Diplodactylus vittatus Eastern Stone Gecko * * Gehyra dubia Dubious Dtella * Gehyra variegata Common Dtella * * * * * Heteronotia binoei Prickly Gecko * * * * * Rhynchoedura ornata Beaked Gecko * * Strophurus Southern Spiny-tailed * * *