02.04.2013 Views

The Vertebrate Fauna of Jenolan Karst Conservation Reserve: Final

The Vertebrate Fauna of Jenolan Karst Conservation Reserve: Final

The Vertebrate Fauna of Jenolan Karst Conservation Reserve: Final

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

have specific information on location presented here for completeness and future reference. All fauna<br />

records collected during the targeted and opportunistic survey techniques were entered into the BSS<br />

<strong>of</strong> the Atlas <strong>of</strong> NSW Wildlife.<br />

Cave Inspections<br />

Target Species: Cave-dwelling bats particularly the eastern bentwing-bat, eastern horseshoe bat and<br />

large-eared pied bat.<br />

Technique: This project aimed to gain an understanding <strong>of</strong> the current occupation <strong>of</strong> the cave system<br />

by insectivorous bats. Due to the limited time available for field survey, a comprehensive survey <strong>of</strong> all<br />

caves was not attempted. Instead, a sub-set <strong>of</strong> caves was chosen based on a literature review and<br />

discussions with staff from the <strong>Jenolan</strong> Caves Trust, <strong>Karst</strong> and Geodiversity Unit and Kanangra Area,<br />

Andy Spate, Julia James, Anne Musser and Ian Eddison. Caves that previously had bats seen within<br />

them, or were considered to hold potential as bat roosting sites, were selected for inspection.<br />

Caves inspected included Mammoth, Teardrop, <strong>The</strong> Devil’s Coach House, Arch, Nettle and Paradox<br />

Caves (for a full list <strong>of</strong> caves visited see Appendix B). During each inspection the cave was searched<br />

with LED torches (assisted with binoculars) for roosting bats. Caves were also searched for guano<br />

deposits, bat odour and staining. Anabat recording was used within caves, however as bats adjust<br />

their calls based on their environment the calls collected inside the caves were not comparable to<br />

reference calls <strong>of</strong> free-flying bats.<br />

Bats were captured by hand using a small scoop net and transferred to cloth bags prior to processing<br />

(in accordance with the protocol approved under the OEH Animal Care and Ethics Committee Animal<br />

Research Authority ARA001204/04). Care was taken not to disturb the major clusters <strong>of</strong> bats.<br />

Captured bats were held for a short period <strong>of</strong> time prior to release. Bats were aged and reproductive<br />

condition assessed using methods described in Parnaby (1992a). Additional notes were taken on fur<br />

colour and wing integrity and bats were checked for identification bands. Colony size was estimated<br />

by counting subsets <strong>of</strong> bats in small areas and extrapolating to estimate the total.<br />

Fly-out Counts<br />

Target Species: Cave-dwelling bats<br />

particularly the eastern bentwing-bat,<br />

eastern horseshoe bat and large-eared pied<br />

bat.<br />

Technique: This consisted <strong>of</strong> an observer<br />

sitting near a cave entrance at dusk with an<br />

Anabat SD1 detector. <strong>The</strong> number <strong>of</strong> bats<br />

leaving the cave was counted until activity<br />

diminished, at this point in time bats had<br />

started returning to the cave. Fly-out counts<br />

done in this manner provide a coarse<br />

estimate <strong>of</strong> colony size.<br />

Anabat Recording at Cave Entrances<br />

Target Species: Cave-dwelling bats<br />

particularly the eastern bentwing-bat,<br />

eastern horseshoe bat and large-eared pied<br />

bat.<br />

Technique: Targeted ultrasonic recordings were made at cave entrances. Detectors were set facing or<br />

inside cave entrances. During analysis, the time <strong>of</strong> exit was noted and compared with the sunset time.<br />

Bats recorded immediately following dusk were assumed to be roosting in the targeted cave (or<br />

nearby). Recorded calls <strong>of</strong> eastern bentwing-bats, in particular were atypical for this species, being a<br />

broader spectrum call (N. Williams pers. comm.). Broader spectrum calls are probably used in<br />

confined environments such as caves (or are the result <strong>of</strong> artefacts <strong>of</strong> the recording environment e.g.<br />

echoes).<br />

Sooty Owl Pellet Collection<br />

Target Species: Sooty owls and small mammals that are typical prey <strong>of</strong> this owl.<br />

Technique: Sooty owl pellets were collected from Arch Cave, Nettle Cave and <strong>The</strong> Ballroom. Sooty<br />

owl pellet deposits have been accumulating in the <strong>Jenolan</strong> Caves system for thousands <strong>of</strong> years; only<br />

contemporary deposits were collected during the BSP project, with fossil and sub-fossil deposits left<br />

16<br />

Fly-out counts were conducted at known bat roosts. Photo © B.<br />

Hope/OEH<br />

<strong>The</strong> <strong>Vertebrate</strong> <strong>Fauna</strong> <strong>of</strong> <strong>Jenolan</strong> <strong>Karst</strong> <strong>Conservation</strong> <strong>Reserve</strong>

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!