Movement of Lizards and Frogs across Box-Gum Grassy Woodland

Sarah Maguire


Last summer I traveled to Cowra, New South Wales, to assist PhD student Stephanie Pulsford with her fieldwork. Stephanie’s work involves studying the movement of reptiles, amphibians and invertebrates across Box-Gum Grassy Woodlands.

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The farm where we stayed, Cowra, NSW. Photography by Sarah Maguire

 

The Problem                                                              

When we chop down trees and clear vegetation to make way for roads and farms, we are destroying the habitats of local species. As human populations grow around the world, so too does this problem. The destruction causes habitat fragmentation, which isolates smaller populations of terrestrial species. Without the cover of vegetation, individuals are at a higher risk of predation. By separating populations there is an increased probability of inbreeding, restricting gene flow and weakening the individuals.

The Aim

Stephanie seeks to find a realistic and cost-effective way to improve the connectivity and movement of lizard and amphibian populations across farmlands. She is researching different scenarios, using fences vs logs vs neither, to see which situation allows for better movement of the individuals. She hopes that this will allow farmers to make changes to their property, which favour the movement of reptile and amphibian populations.

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Drift fences at one of the exposed sites. Photography by Sarah Maguire

 

My Role

I spent one week with Stephanie, where we lived with other volunteers in a cottage located on one of the farms we were working on. The first few days were spent setting up the traps, a laborious task of digging trenches and hammering in the frames for the drift fences. We set up funnel and pitfall traps to catch any animals which ran along the fences. After that, every day began at about 6am as it was the height of summer and animals could not be left in the traps for too long or they would dry out. Initially, I was a bit apprehensive sticking my hand into a pitfall trap full of huntsman spiders, centipedes, and on one occasion, a Blackish Brown snake. Nevertheless, I got used to it, and every day we recorded what we found.

The Blackish Brown snake, which escaped soon after this photo! Photography by Sarah Maguire

The Blackish Brown snake, which escaped soon after this photo! Photography by Sarah Maguire

The most common species of frog we caught was the Spotted Marsh Frog, and lizard was the Rainbow Skink. When individuals were captured, we injected them with a small drop of an illuminous substance which hardens under the skin. This is deemed safe for the animal, and is injected on their underside so as not to make them more visible to predators. In the case of recapture of the same individual, we knew that it has been caught before by shining UV light on the marking. This capture recapture method provides an important insight into the movement of the species across the landscape.

Spotted Marsh Frog. Photography by Sarah Maguire.

Spotted Marsh Frog. Photography by Sarah Maguire.

The Bigger Picture

Stephanie is gathering the data from her fieldwork to determine which areas have more amphibian and reptile movement. She will compare the exposed areas with the sheltered areas that have logs, and with the areas which have fences. If animals use the sheltered areas more often when moving locations, by placing logs or fences on their farms landowners could improve the quality of life for these species. Best of luck to Stephanie with her PhD!

References

Fischer, Joern, David B. Lindenmayer, and Ann Cowling. “The challenge of managing multiple species at multiple scales: reptiles in an Australian grazing landscape.” Journal of Applied Ecology 41.1 (2004): 32-44.

Hazell, Donna, et al. “A comparison of constructed and natural habitat for frog conservation in an Australian agricultural landscape.” Biological Conservation119.1 (2004): 61-71.

Mac Nally, Ralph, and Geoff W. Brown. “Reptiles and habitat fragmentation in the box-ironbark forests of central Victoria, Australia: predictions, compositional change and faunal nestedness.” Oecologia 128.1 (2001): 116-125.

 

 

 

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About Biodiversity Conservation Blog

I am an Associate Professor at The Australian National University and convene a (very awesome) course called Biodiversity Conservation. Myself and students in the course contribute to this blog.
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One Response to Movement of Lizards and Frogs across Box-Gum Grassy Woodland

  1. Chloe says:

    Some interesting work being done here! It would be great to link through to further information in the text of your blog – particularly to key ecological concepts like stepping stones, connectivity and fragmentation. Also, it would be interesting to know why private lands are important for the protection of reptiles and frogs!

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