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7th July 2022, Elgin Inn, Hawthorn
 

 
2022 Mini-conference
Program
 

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Clare Brownridge

Guest

Frogs for Beginners

What Clare doesn't know about frogs, she makes up for in enthusiasm and poetry. 

A rhyming journey of discovery into the world of frogs from a non-expert.
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Teisha Sloane-Lay

Frogs Victoria

Frogs Rule! / Frog Rules

Teisha is an ecologist with a passion for threatened species conservation and community education.

Regulations regarding amphibians in Victoria. Five slides of dos and don'ts when it comes to frogs in Victoria, and what to do when you come across an exotic species.
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Sam Wallace

University of Newcastle

Uncovering the ecology of threatened Heath Frogs

@WallacXFrogging  |   @wallace_s_

Samantha Wallace is a PhD candidate at The University of Newcastle. Sam completed her Bachelor of Environmental Science (Honours) at Deakin University, where she scampered after frogs across agricultural landscapes. With Newcastle as her new home, Sam’s PhD investigates all things Littlejohn’s and Watson’s Tree Frog-gy (Litoria littlejohni and Litoria watsoni). 

Perhaps the greatest challenge to conservation science today is the endeavour to preserve species from ever-accelerating rates of extinction. Such rapid and sustained species declines place considerable pressure on the development effective conservation initiatives. Successful conservation strategies must be founded upon a well-informed understanding of species’ ecology. Unfortunately, ecological information is not readily available for many cryptic anurans. This paucity of information is particularly apparent for Littlejohn’s Tree Frog (Litoria littlejohni) and Watson’s Tree Frog (Litoria watsoni). The ecology and breeding biology of heath frogs remains relatively unknown, largely due to their cryptic nature and apparent rarity. To combat significant ecological knowledge gaps and investigate breeding habitat selection, we undertook surveys for L. littlejohni and L. watsoni across 31 sites in southern NSW. Overall, L. littlejohni and L. watsoni exhibited slightly different relationships with breeding habitat features, although the presence of fish had a strong negative impact on both species.
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David De Angelis

Frogs Victoria

Persistence of the Growling Grass Frog (Litoria raniformis) in the middle Yarra River catchment

Dave is Frogs Victoria Treasurer, a naturalist, environmental educator and zoological consultant with a background in ecological land management. He is particularly interested in the conservation and ecology of frogs and reptiles.

The Growling Grass Frog (Litoria raniformis) was common across the greater Melbourne area before the start of the century, but has since become largely restricted to western and northern areas close to the urban fringe, and near-coastal habitats in the outer south-east. Calls thought to be those of the Growling Grass Frog were heard on a private property in Coldstream, the Yarra Valley, in October 2019. Auditory and visual surveys targeting the species were undertaken on the property over two nights in December of the same year. Multiple individuals were head calling during both surveys and 14 were seen on the second night, including a metamorph. The record is of significance as the species is not known to have been reported from the Shire of Yarra Ranges or wider middle to upper Yarra River catchment since 2006.
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Matt Clancy

Frogs Victoria

Frogs of Borneo

@MattClancy94   |   @clancy_wildlife

Matt is a zoologist and wildlife photographer with an interest in herpetology (especially frogs) and threatened species conservation. 

From the Giant River Toad to impressive flying frogs and minuscule microhylids; Borneo is home to an incredible amphibian diversity! There are nearly 200 known species inhabiting a range of truly wild and ancient rainforest environments.
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Danielle Wallace

University of Melbourne

Lovesick? The effect of chytrid fungus infection on amphibian breeding display

Twitter: @that_frog_gorl

Instagram: dani_k_wallace

 

Danielle Wallace is a herpetologist and PhD candidate in the One Health Research Group at the University of Melbourne. Her current research focuses on the impact of the devastating disease, amphibian chytrid fungus, on reproduction and breeding display in Victorian frogs. She also works as a wildlife ecologist conducting surveys for threatened species in remote forest areas. 

The devastating amphibian chytrid fungus – caused by the fungal pathogen, Batrachochytrium dendrobatidis, (Bd) – has caused widespread amphibian declines and extirpations. Although the development of disease been examined in a range of species, little is known about its effect on reproduction. Here, we investigated how chytrid fungus affects male mating display in the critically endangered Alpine Tree Frog (Litoria verreauxii alpina). We collected call recordings of wild frogs in the field and used a spectrophotometer to analyse male breeding colouration, while swabbing all individuals for infection. We then analysed the call characteristics and colour profiles of infected and uninfected frogs to determine whether infection influenced calling performance and breeding colouration. We found that colouration in Alpine Tree Frogs was affected by chytrid fungus, with UV chroma increasing with infection status and load. These are the first results to show that chytrid fungus influences male breeding colouration. Calling performance was also closely linked to temperature variations within different amphibian microhabitats. The results that we present here are important but often overlooked aspects of disease ecology. We have shown that sublethal effects of disease can impact breeding behaviour and display. These changes in reproduction and breeding success in response to disease might have dramatic consequences on population trajectories and substantially influence population decline or recovery potential. It is therefore crucial that we investigate sublethal effects of infection and its influence on reproduction and recruitment, so that we can understand the impact of disease on populations.
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