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It was wet and cold but good weather for frogs and snails

The inclement weather probably accounted for the fact that Juanita and I were on our own last Saturday night and even we decided to take a shortened walk via Lennox Cr to McClelland’s lookout. However, the rain certainly didn’t discourage two groups of nocturnal animals that love moist weather. The robust whistling frog (Austrochaperina robusta) was calling continuously all around Lennox Cr.

This small frog is seldom seen (I have never seen one!) but is one of the most familiar nighttime sounds around Paluma whenever the weather is wet. We got within half a meter of several calling individuals but they were very well hidden. Another common frog around Paluma that is very noisy but highly secretive is the southern ornate nursery frog (Cophixalus ornatus). It too could be heard during the walk but much less frequently and as usual we did not see one (although I did spot one once in my garden last year). Have a listen to the calls below and see if they sound familiar.

Although it was not calling on Saturday night we did spot our resident yellow-thighed tree frog hanging out near our concrete wash-tub pond at home at the end of the walk.

The other group of animals that reliably comes out at night, especially when it’s wet, is land snails. Australia has a very rich diversity of endemic land snails ranging from ones with full-sized shells to semi-slugs with a very small vestigial shell that they cannot retreat into and is normally covered by a layer of tissue. We saw two snail species and my best guess is that they were both locally endemic snails named after our village!

Dark Paluma banded snail (Steorra jimfergusoni)

Paluma semi-slug (Fastosarion paluma). Note the orange vestigial shell slightly exposed in the right hand image.

Using UV torches has become de rigueur on our night walks and while we did not come across any of the striking fluorescent blue liverworts that we often see on the H-Track, a couple of trees had strikingly fluorescent lichens. Juanita took several pictures and then returned on Sunday morning to get comparative daytime shots of the same patches. The difference is amazing.

Fluorescent lichen on trees under UV light (left) and during the day (right). Photos by Juanita Poletto

We will have another night walk in around 2 months time and would love some company if you are up in Paluma and feel like a night-time stroll. We always seem to find something interesting!

Text by Jamie Oliver; photos by Jamie Oliver unless indicated

This is a reminder that the next Paluma After Dark walk will be this Saturday, August 27th. We will meet at 6:30pm at Potters Park opposite 27 Lennox Cr. It could be a bit chilly and there is a small chance of rain, so bring a jacket/raincoat as well as a torch. I will have spare UV torches for anyone who is interested in looking for fluorescent liverworts or lichen. Hopefully, we will see some bandicoots and pademelons along the track.

Jamie

The recent “Paluma After Dark” night walk took place last Saturday night at Don Battersby’s place on Hussey Road. The walk was well attended, with 7 locals and 5 visitors. A quick tour of Don’s property revealed a few interesting fluorescing lichens and plants and several tiny prowling wolf spiders whose eyeshine seemed disproportionately bright for their tiny size.

Once into the forest behind Don’s block we were given a full tour of the track to Ethel Creek and back via Hussey Road.

Using the various UV torches on hand, we saw several glowing supplejack vines, many brilliant red tree seedlings and several spiders, including the common jungle huntsman. Several mossy logs also had a sprinkling of fluorescent bryophytes similar to ones we have previously found on the H-Track.A couple of us also heard and caught a fleeting glimpse of a native rat, but not enough to identify the species.

On the way back to Don’s, walking along Hussey road with heavy feet and flagging attention, Juanita spotted some eyeshine in a tree beside the road. Closer inspection showed it to be a sugar glider (Petaurus breviceps). Although about 5m up and partly obscured by branches it was nevertheless easy to make out the facial markings and skin folds between fore and rear legs that provide for fairly positive identification. It was a great ending to the evening and is the first arboreal mammal that many of us have seen in Paluma. As an added bonus, one of several leaf-tailed geckos (Saltuarius cornutus) living in Don’s shed came out to bid us goodbye as we prepared to leave. Below are pictures (not taken that night) that illustrate these last two species.

Many thanks to Don, for his enthusiasm and stamina in leading this walk.

Our next walk will be in August and will be advertised on the web.

Text by Jamie Oliver; photos as indicated

The next scheduled Paluma After Dark evening walk will be this Saturday evening at 6:30pm. This time we will be exploring Don Battersby’s property and nearby forest for animals that he has seen around there over the last decade or more.

We will meet at 6:30pm at Don’s place just around the first bend of Hussey Road on the left. Bring a head torch and UV light if you have them – and warm clothes!

The UV lights have proven useful in highlighting some highly flourescent mosses, liverworts and other seedlings, but they are also known to pick up scorpions. I can testify that this is the case for at least one scorpion species that was spotted during my recent trip with Tony and Julie Bligh across the Simpson Desert. Paluma also has at least on species of scorpion so we might see one of these on the prowl this Saturday

Jamie Oliver

This Saturday’s Paluma After Dark walk along Lennox Cr and the start of the H-Track was a success with a small but enthusiastic group of residents and a bit of luck with the inclement weather. Colwyn Campbell was able to joint the group, together with Michele Bird, Jodie Pace, Juanita Poletto and myself.
Fortunately, the rain paused just before our scheduled walk and started up again just as we finished. The wet forest floor was covered in gleaming droplets lit up by our torches, but we were still able to see eyeshine from some huntsman spiders and a nocturnal moth. There were several larger items on display as well, including a medium-sized amethystine python crossing the path in front of us, a native rat glowing bluish in our UV lights, a small colony of glow worms (and a minute luminous mushroom) along Lennox Cr. and a large log covered in brilliantly fluorescing liverworts.

One of the things we learned on the walk was that when it comes to using UV light to bring out fluorescence, “torches ain’t torches”. The common inexpensive UV torches available in Townsville stores emit light that is only just within the UV range and also produce substantial visible violet light that can mask or mute the fluorescence. A recently purchased (but more expensive) UV light that emits more light fully in the UV range (365nm) induced more brilliantly blue fluorescence in the liverworts, but also created stunning red fluorescence in some mosses and the new leaves of small seedlings in the forest floor.

Here are a few photos from the walk that will hopefully inspire others to join our next walk in June.

Text and photos by Jamie Oliver

The second “Paluma After Dark” night walk is scheduled for this Saturday at 7pm, starting at Potters Park (27 Lennox Cr).

In the weeks since the inaugural walk in March, there have been a number of unofficial night walks around the village that has uncovered some additional features that can be easily seen along Lennox Cr or the H-track. The most spectacular is the discovery of brilliant green fluorescent liverworts along the H-track. These small moss-like plants are not normally visible in the dark, but suddenly glow electric blue when illuminated with UV light. On the H-track, these liverworts can cover entire logs, mostly as an understory plant beneath and between moss and other non-fluorescing liverworts. Andi Cairns, who is a local expert on liverworts organized a dedicated collecting trip with me and Will Cairns as collectors (the most conspicuously fluorescing logs were just out of wheelchair access range for Andi.) Andi has identified the species as Bazzania vittata.

A rotten log on the H-track. Top left: Illuminated by normal torchlight. Top Right: Illuminated with a UV torch. Bottom: Using both torches to show how the fluorescent species is a relatively inconspicuous component of the surface of the log, which is dominated by a moss and a larger liverwort, Photos by Will Cairns.

After consulting her network of experts from other states and countries it appears that this phenomenon is a recently discovered property of just a few species. And her posts and pictures have motivated other bryologists to go out with UV torches to see what they can find! There is active speculation (but no firm conclusions) on what adaptive advantage this fluorescence confers on the liverwort. It is possible that it provides some protection against UV damage as the fluorescence serves to absorb potentially harmful UV and re-emit it as safe visible light, but there may be other possible explanations.

I have been out on 4 occasions over the last month and have seen these glowing liverworts each time, so I am pretty sure they will be visible during our next Paluma After Dark walk this Saturday.

The other discovery (at least for me personally) is that there is a small colony of glow worms living on a low vertical earth cutting just before the first left-hand bend in the crescent (starting from Potters Park). Several residents have mentioned to me that they have seen glow worms in the past around Paluma, but it’s great to find some right along the road near my house. unlike the fluorescent liverworts, glow worms are bioluminescent and emit light during the nighttime to attract small insects that they feed on. Glow worms are actually the larval phase of a small fly (several species of fungus gnat) belonging to 3 genera. In Australia & NZ there are nine species belonging to the genus Arachnocampa. Here in Queensland the predominant and endemic species is Arachnocampa tropica, which can be found throughout the wet tropics. The larvae of all glow worms produce a series of horizontal and vertical threads with viscous droplets that act as a fly trap for small insects. The larvae live and grow for about 6-11 months while the adult is very short-lived.

I will certainly ensure that we check these out as well during our next night walk.

Text by Jamie Oliver, photos as indicated

The next Paluma After Dark walk will be at 7 pm, Saturday, April 23, at Potters Park (27 Lennox Cr). Bring a head torch and a UV torch if you have one. I will have several UV torches to share.