Nature – Page 12 – Paluma – our village in the mist

Rainforest Tree of the Month, January 2021 – Atherton Fig

The Atherton Fig (Ficus leptoclada) is one of 15 species of sandpaper fig in Australia. These figs are non-stranglers and have (to varying degrees) rough sandpapery leaves. Unlike the strangler figs, they are dioecious (having separate sexes).

Atherton Figs are endemic to northern Queensland rainforests up to an altitude of 1,000m. They are common on road sides or in regrowth areas where they grow as relatively small trees (up to 15m) with slender trunks. The leaves are eliptical to narrowly ovate and about 8-12 cm long with a raspy feel to the lips (yup – you are supposed to “kiss” the leaves to assist in identification!).

This Atherton Fig on the track to Witt’s lookout is the smaller tree with brighter green leaves to the right of the large trunked tree

When in fruit, trees can be spectacularly laden in small brightly coloured fruit. Ripening figs show attractive shadings of yellow to orange-red and are born both on branchlets and on the main trunk or limbs. When ripe they are more uniformly red/purple and are up to 2cm in diameter.

The figs are eaten by fruit pigeons and the double-eyed fig parrot.

There is a lovely example of an Atherton Fig that is currently in fruit at the first small clearing about 100m down the walking track from McClelland’s lookout to Witt’s lookout. Look for coloured fruit on the ground. The tree has a narow trunk just behind a larger tree at the edge of the clearling looking back to McClelland’s lookout.

I have previously mentioned the close relationship between figs and the specialised wasp species that they rely on to pollinate their flowers. If you are interest in joining me in a deeper dive into the evolutionary biology of this relationship keep reading below (it might get a bit technical).

Text and photos by Jamie Oliver

https://apps.lucidcentral.org/rainforest/text/entities/ficus_leptoclada.htm

Figs and Fig-wasps: an evolutionary arms race that may never end

Figs are not actually fruit (which develop from the ovary of a single flower) but rather an enclosed cluster of flowers (synconium). Since there are a variety of insects and other animals that enjoy munching on flowers, seeds and fruit, it makes some sense to enclose all your flowers in a tough leathery pouch, but then the problem is how to ensure polination of your flowers. Figs do this through associations with a family of wasps that specialize only on laying their eggs in the ovaries of figs. The relationship is highly specific: one fig-wasp species for each species of fig.

The basic sequence of polination and wasp reproduction is as follows. The female wasps are just small enought to enter the fig body through a small hole. In the process they lose their wings and antennae and will not subsequently be able to leave the fig. Once inside they lay their eggs in as many female flowers as possible and then die. The eggs then hatch out into male and female wasps. The males never leave the fig but spend their lives searching (and fighting other males) for newly hatched females to mate with. The last act of a male is to chew its way to the outside, making a large exit hole that allows new females to leave the fig. On their way out, the females collect pollen from male flowers, and then seek out new figs to lay their eggs in.

Wasps are notorious parasites and the fig wasps are no exception. Their main interest in the relationship is to produce as many offspring as possible by laying eggs in the ovaries of female flowers, where the larvae develop by eating the developing fig seeds and surrounding tissue. The destruction of any developing seeds is clearly not in the best interests of the fig, so the relationship is a tense one: the fig just wants to use the wasp to tranport pollen from the male flowers to the female flowers (in a different fig), while the wasps, given a chance, would lay their eggs in all or most of the ovaries of female flowers, rendering them (and potentiallly the whole tree) sterile in the process. Thus while each species is dependent on the other, they are both trying to gain the upper hand with the evolution of traits that maximise the advantage on both sides. In effect this is an evolutionary “arms race”.

In hermaphroditic figs, where the separate male and female flowers reside in the same fig body, the solution that has evolved in the fig species is to make some of the female flowers inaccessible by hiding them deep under the inner surface of the fig where the wasp’s ovipositor can’t reach, while letting the wasp parasitise the other flowers so as to ensure some wasps are allowed to develop. This compromise lets some of the fig flowers develop fully mature seeds, but many are sacrificed to allow wasps to developed. The wasp on the other hand has lower than optimal reproduction since it can’t parasitse every female flower. This has turned into a relatively stable stand-off between the competing interests of the two species. However ….

In dioecious species (thought to have evolved from hermaphroditic speces) there are trees with figs that are all male, and other trees that are all female. In these species the balance may have shifted a bit in favour of the figs. In this case the male trees have male flowers but also female flowers that are sterile (the figs are more accurately described as “functionally” male). As per the above sequence, female wasps enter male figs and lay their eggs in the sterile female flowers. The offspring hatch out and the new fertilised females collect pollen from the fully functional male flowers as they exit the fig to find other fruit to parasitise.

The twist here is that the female fig trees have fruit (with only fully fertile female flowers) that are equally attractive to the female wasps (they are drawn in by a specific odour emited by the fig) but the ovaries in these female flowers are completely inaccessible to the wasp. So female wasps that end up entering a female fig wander around inside polinating the female flowers but never managing to parasitise any flowers before they die. This arrangement suits these fig species well since it can invest as much energy as it wants into the development of female flowers and seeds and only sacrifice a smaller amount of energy into the production of sterile female flowers in the male figs.

Since a small amount of pollen can fertilise a large number of female flowers there are often many more female figs compared to male. The female figs don’t get parasitised so the result is a high reproductive output for the figs. But if the majority of figs in any location are female ones, then the wasps lose out since most of the female wasps will end up in female figs and never reproduce. The fig species only needs to produce enough male figs to ensure adequate pollen production and sufficient wasp production to ensure the pollen is duly transported to all the female figs. At this point if you have been following the story you may (like me) think that its starting to look like the fig is “farming” wasps for the purpose of polination! Perhaps future evolution will see wasps being more and more like a managed speces. But since evolution is based on the accumulation of chance events, perhaps wasps will evolve countermeasures that enable it to parasitise female fig flowers, or avoid them in favour of male figs ….. and the “arms race” will continue.

Jamie Oliver

Paluma hosts a nightly light-show in the forest

Although New Year’s eve in Paluma (like many other places in Australia) lacked a fireworks light-show, there is currently an nightly light-show to be seen along the rainforest tracks thanks to the bioluminescent fungi that are currently emerging with the rains. This display may not last too long, but with the rains predicted to persist for another week at least, you stand a good chance of seeing some of these remarkable little mushrooms if you wander down the H-track or the Rainforest track after dark.

In previous years I have occasionally gone out on wet nights during the summer and, after waiting in the dark for my eyes to adjust, could see faint ghostly glows scattered along the forest floor. But when turning my torch back on there was nothing to see. Even when I located the source of the glow, it was just a wet leaf or branch. I have always assumed that this was luminous fungal mycelia (the almost invisible network of threads that represent the bulk of the organism), but until last year I had never seen any actual mushrooms glowing in the dark. I only saw a couple back then so this year the family and friends went out on two nights to see if we could see them again. On the first night we went around the H-Track and on New Year’s eve Juanita and I went down the Rainforest Track. On both occasions we saw 5-10 clumps of tiny brightly glowing mushrooms on small twigs and along dead sections of lawyer vine.

Mycena clorophos; photo by Juanita Poletto

These were many times brighter than the glow from the mycelia seen on other occasions. Unfortunately I did not have by big camera with me to attempt to photograph the bioluminescence (it requires exposures of over a minute to get a good image) and we only got pictures of the mushrooms illuminated by our torches. But there are many pictures of this species on the web, such as the one below, that provide an idea of what can be seen.

While there are several species of mushroom that bioluminesce, these ones appear to be Mycena chlorophos, a widespread species found in sub-tropical Asia, Indonesia, Japan and Brazil. The caps can be much larger than the 3-8mm diameter ones seen so far in Paluma.

Reseach on a different species of bioluminescent mushroom suggest that this trait has evolved to enhance the dispersal of spores by insects attracted to the glow.

Text by Jamie Oliver, Photo by Juanita Poletto

Monty’s return for Christmas Dinner

Last Christmas a amethystine python dubbed “Monty” with a very large lump was seen on the rainforest track. Well his assumed penchant for Christmas turkey seems to be confirmed with a recent sighting of a very similar python with a very similar turkey-sized lump opposite the High Ropes course.

Carla Oliver and friends were heading down the mountain on the afternoon of New Year’s eve when they saw Monty crossing the road.

It would be great if this were indeed the same python as last year, especially since these large slow moving reptiles (especially after a big meal) can be very vulnerable to being run over when crossing the road. Let’s hope this becomes an annual sighting!

Photo/Video by Carla Oliver; Text by Jamie Oliver

A Look at the Boobook……

A couple of weeks ago, we were gifted with the rare treat of boobook owls. Boobooks are Australia’s smallest and most widespread owls, and, as with most owls, are seldom seen. In the Hawk Owl family (genus Ninox), these fledglings appear to be the more commonly distributed subspecies, Ninox boobook ssp boobook, rather than the rainforest subspecies of lurida, which is interesting as it means both subspecies must overlap in range here at Paluma.

We had heard both boobook and lesser sooty owls the previous evening, and saw at least one of the adult parent birds very early, from the bedroom window. The photos were taken from the lounge room window. These fledglings were being guarded by an adult bird, who quickly flew into the forest when spotted, but the fledglings stayed put for most of the morning, giving us a glorious opportunity to watch them watching us!

Owls are apex predators in many environments, and are at risk of consuming or accumulating toxins used to control pest species such as insects and rodents. While in Paluma, commercial spraying of pesticide is not a threat to these birds, the indiscriminate use of rodent poison certainly is. We ask all residents to consider live trapping for control of rodents over use of toxic baits. This provides not only the opportunity to identify the trapped animal, and release in a suitable location if one of our valuable endemic species, but also prevents the inevitable leeching of these toxins into our environment. After all, wouldn’t it be nice to have more owls around so that they can control the rodents instead!

Article & Photos by Sarah Swan

Rainforest Tree of the Month, December 2020 – Black Pine

It seems appropriate that during this month of Christmas we feature an evergreen conifer as our tree of the month. The Black Pine (Prumnopitys amara). This species is widely distributed in north-east Queensland as well as New Guinea and Indonesia. It can grow to 60m and has a frequently dark to blackish trunk with scattered cracks. Mature leaves are long and narrow with a distinct groove along the mid-vein on the upper surface. The species name “amara” is from the latin word for bitter and refers to the fact that the leaves, if chewed, are initially sweet tasting but then turn bitter.

None of these features are easy to distinguish in the field, but luckily the fruit are very easily recognised scattered on the ground along walking tracks. They are bright red and globular (20-25mm wide) with a shallow flesh around a hard gloubular seed. Fruit can be found on the forest floor from December to February. They are eaten by Cassowaries, and several species of rainforest rat.

Prumnopitys amara fruit collected behand Paluma Dam, February 2016

Black Pine nuts are one of about four species of rainforest seeds regularly that were used (and relied on) on by rainforest aborigines as a source of carbohydrates. While some of the seeds required lengthy preparation to leach out toxins and bitter chemicals, Black Pine seeds, could simply be collected and cooked for thiry minutes in a grond oven and then cracked open to reveal the tasty kernels which were then pulverised between two stones.

The timber from the Black Pine is used in New Guinea and Indonesia for general building purposes as well as funiture including butter churns.

Other conifers around Paluma

Conifers belong to a group of seed-bearing plants (including Cycads and Ginkos) in which the seed is not enclosed in and ovary (Gymnosperms – meaning naked seed). The seeds of conifers (Pines and relatives) are borne within cones. Australia has several conifers that are endemic (found only in Australia) and one which is considered to be a “living fossil” (Wollemi Pine).

The Black Pine is one of only a few naturally occurring rainforest conifers in the Paluma region. Two others that can be potentially (but not commonly) seen are “Plum Pines” or Podocarps (Podocarpus grayae and Podocarpus elatus). Both are called Brown Pine and both are endemic to Australia. While not strictly a rainforest pine the Hoop Pine (Araucaria cunninghami) can also be seen naturally on the slopes down to the coast along the range road, and there are several large specimens that have been planted out around the village. It is not restricted to rainforests, and is common around the rocky coast of Magnetic Island.

There are other species of native pine that don’t naturally occur in Paluma but that have been planted out around the village. These include a small Bunya Pine (Araucaria bidwilli) around the first corner of Smith Crescent and a Kauri pine (probably ~~Agathis microstachya~~*) behind the Paluma Environmental Education Centre. Two small potted native “Christmas trees” adjacent to the the Community hall include one conifer naturally found only in the mountains west of Mossman (Mt Spurgeon pine, Prumnopitys ladei) and a variety of casuarina (not a conifer) called the Daintree Pine (Gymnostroma australianum).

Text and photos (unless indicated) by Jamie Oliver

*Note: the Kauri pine behind PEEC is, on closer inspection, most likely to be Agathis robusta. It is distinguised by its smooth bark with thin flakes. – Jamie

A Motley Moth……

There is no doubt that we co-habit with a diversity of interesting critters at Paluma, but this moth has to be admired for its remarkable and distinctive appearance. Spotted at Peter and Jan Cooke’s place just recently, this moth flew in and spent a few hours resting around the place before heading off back to the forest.

Check out the big hair-do and the antennae. A good leg wax is certainly well overdue !!!!

Have you spotted any interesting insects or other critters around your place with the warming of the weather and the first summer showers? If so, please send us a photo so we can share your discoveries with other residents.

Photo by Peter Cooke. Text by Michele Bird.

Rainforest Tree of the Month, November 2020 – Washing-board Tree

The washing-board tree (Cryptocarya corrugata) belongs to the Laurel family (Lauracea). There are over 300 species in the genus Cryptocarya, most of which inhabit cloud covered rainforests. This particular species is endemic to central and northern Queensland upland rainforests.

On close inspection the tree has distinctive red flakey bark and conspicuous fist to saucer-sized dimples along its trunk where the bark has flaked off. The sap-wood has a corrugataed surface, but this is largely masked by the outer bark.

Cryptocarya corrugata (Washingboard Tree) on the H-track. This is one of the recently retagged trees that are part of the upcooming revised Guide to Trees of the H-Track (Photo by Will Cairns)

The washing-board tree can grow up to 35m tall and occasionally has a butressed trunk. The cut bark and outer wood (a blaze) smells like sugar cane, but with alternative common names such as Bull’s Breath and Acid Wood this smell be a matter of personal perception.

The twigs and new leaves are covered in twisted brown hairs, while the older leaves become hairless (glabrous) with age

The fruit of the Washing-board tree are also distinctive. They are large ( 15-22mm high x 22-34mm wide) and broad or bilobed with a smooth to shiny purple-black outer surface. Flowering occurs in December, with mature fruit developing the following September. The fruit are eaten by cassowaries and fruit doves.

Cryptocarya corrugata fruit (Photo by Russel Cumming on Flickr)

The wood of the washing board tree is infrequently used for general purpose timber under the name “Corduory Laurel.

You can find a tagged specimen (#4) of this species near the beginning of the H-Track (starting at Whalley Cr) on the right hand side of the track. This tree is part of a Guide to the Trees of the H-Track which is currently being revised with new text and new white tags.

Text by Jamie Oliver

A few nature notes as summer arrives

A deliciously sweet fragrance at the approach the Loop Road, and the humming of bees, draw attention to a stand of Brown Gardenias (Attractocarpus fitzalanii,) which are covered in small white, five-petalled star-shaped flowers. This is an unusually heavy flowering and the trees look spectacular.

Brown Gardenia (Attractocarpus fitzalanii)

In the nearby cutting and in several other roadside tangles, the Hibbertia scandens vines scramble to the tops of trees, scattering their bright yellow flowers over the foliage.

Hibbertia scandens (Golden Guinea Flower) (photo by J. Oliver)

Glochidion hylandii trees are laden with pin-cushion-like fruits nestling in the leaf axils along almost every branch. Recently, an unusually abundant flowering of Sloanea australis took place in the stand of trees outside PEEC. The spiny-covered fruits should soon be found ripening on the trees.

Glochidion hylandii (Hyland’s buttonwood)

On the forest floor among the dropped seeds and fruits are the dark red to black drupes of Bollywood, (Litsea connorsii) and the glossy, black 30 mm long drupes of the Ivory Walnut (Bielschmiedia recurva).

Bielschmiedia recruva *(Ivory Boxwood)*. Photo on the right shows slightly fresher specimens from the Bluewater Track with glossy surface and ivory coloured inner seed flesh (photo J. Oliver)

Sarsaparillas (Alphitonia petriei), herald the approaching festive season, looking splendid with their tiered branches covered in white to cream flowers suggestive of snow-clad Christmas trees.

Literally, here today and gone tomorrow, are the various fungi which have popped up in response to recent rain. Notable was a brilliant red, star-like fungus: the anemone stinkhorn, (Aseroe rubra).

Some early fungi in the gardens include the Plantpot Dapperling (Leucocoprinus birnbaumii) obediently growing in a pot (above), and the much rarer and quite spectacular Anemone Stinkhorn (aseroe rubra) looking very much like its namesake.

There are many more little treasures to be found on your walks – just keep a wary eye out for snakes though!

Text and photos (unless indicated otherwise) by Colwyn Campbell

Nesting Time at the Klumpps……

Dorothy and Peter Klumpp have kindly shared some photographs from their back verandah. Just recently the Bower’s Shrikethrush (Colluricincla boweri) has moved in and is nesting, literally on the backdoor step. The chosen nesting place is a hanging basket that once held a pot-plant. Peter says that his ineptitude at gardening has finally paid off. The plant died and the birds took the opportunity to make good use of the macrame plant hanger. Of course, we all know that the Klumpps are great gardeners, but in this case they have graduated from green-thumbs to feathered fingers!

One nesting season I had the Bower’s Shrikethrush build a nest in the plastic peg basket hanging from the (undercover) washing line. Colwyn has had the birds return several seasons to also nest in her peg basket on the back verandah.

The Bower’s Shrikethrush is endemic to upland rainforests in the Wet Tropics region. It has been described as “one of the more common plainer birds in the tropical rainforest”. No one who has heard the call of this bird would describe it as plain. Female and male birds are distinguishable in that the female has an eye ring and eyebrow of pale feathers that is lacking in the male. The Bower’s Shrikethrush feeds on insects and their larvae from the mid-canopy and often on the ground.

We look forward to an update on the nesting at the Klumpps and some photos of the new (feathered) grandchildren??!!

The Bower’s Shrikethrush sitting on eggs. Note the very dead pot plant!

Text by Michele Bird and Photos by Peter & Dorothy Klumpp.

Rainforest Tree of the Month, October 2020 – Syzygium wilsonii

Also known as Powder-puff Lilly Pilly and Wilson’s Satinash, this tree was possibly named after Dr Thomas Braidwood Wilson, (1792 – 1843), a botanical collector in the 1890’s.

It is an unremarkable-looking little tree, with its straggly growth under and among the protective foliage of neighbouring trees, but it bears beautiful, pompon flowers which make the plant worthy of recognition. Although not endemic to Paluma, there are several examples of this Lilly Pilly in Paluma gardens. Perhaps the most striking, as it is bearing blooms at present, is in the garden bed beside the office at PEEC. Another small shrub grows in the Trees of Memory grove, alongside the memorial stone.

The natural distribution for this Lilly Pilly is in the rainforest at Whyanbeel, near Mossman to Hinchinbrook Island, at altitudes up to 850 metres.

The leaves of this tree are distinctive. They are simple, alternate or opposite, hairless and can be quite large, growing from 80 – 190 mm by 22 -54 mm. with a recurved margin. New growth is spectacular with deep salmon-pink colouration.

Flowers, growing in axillary or terminal panicles, hang modestly among the foliage and can easily be missed. The individual flowers are tiny, the red trumpet shaped calyx hidden by the dense cluster of magenta to crimson stamens, about 20 mm in length. They form a dense, soft pompon about the size of a mandarin, hence the name powder-puff. An accompanying photo shows the remains of the flower panicle after the stamens have gone. Flowering season can last from June to December.

The fruit of the Powder-puff Lilly Pilly is a fleshy white or cream berry, 10-18 mm long by 10 -16 mm long. It contains one seed. Like most Syzygiums, the fruit is edible but is very sour and unpleasant to eat raw. As I do not have a photo of the fruit, a sketch will have to suffice. Note the ant which was determined to get into the picture!

Next time you stroll around the streets of Paluma, see if you can spot one of these demure little trees.

Text and photos by Colwyn Campbell