After a good year’s flowering and seeding, there is an abundance of old grass stems in our yard at Strangways. These stems are a surprisingly popular venue for invertebrates by night.
One grass stem provided a bed for a Halictid bee which I think was well asleep as it was very unfazed by my bright lights.
I also found a few bugs which look like more advanced versions of a Stenophyella nymph that I posted a little while back. These are seed eating bugs which explains their interest even though most of the grasses have already sent their seed off on the winds.
Weevils are also on grass stems in numbers. I suspect they are feeding on the stems.
And where there are herbivores, there are also carnivores. This spider was so flat against the grass stem when I found it that I thought it was just a discolouration of the plant. Anything unusual is always worth a look.
Elsewhere, I found a species of Horned Treehopper that I’ve not seem before. Most summers I see quite a few Acacia Horned Treehoppers on our wattles, with a perfect green camouflage. These were Brown Horned Treehoppers, also on a Golden Wattle stem and to me they looked so other-worldly.
After having written about the waves of Belid Weevils and Acacia Jewel Beetles a week or so ago, I am now seeing a wave of different wasp species. Many are parasitic and I imagine the wave corresponds to the availability of suitable hosts.
On the Hardenbergia in our yard that seems to be a dormitory for many napping insects, I found a wasp which I think belongs to genus Lissonota. These are parasitic wasps in the family Ichneumonidae. Wasps in this family tend to lay eggs in or on the caterpillars of pupae of moths and butterflies, finding the food sources of their target species and using their antennae to smell out a host. Lissonota wasps tend to have white sections on their antennae.
Netelia is another species of Ichneumon wasp. This one was also on the Hardenbergia, but was quite active on the night I found it, rather than sleeping like the Lissonota which was a few leaves away. I gather that Netelia wasps lay their eggs on rather than in their hosts which makes them ectoparasites. In addition, they are koinobionts which means they don’t impair the development of the host. In contrast, parasites which do impair their hosts (eg wasps that paralyse their hosts) are called idiobionts. Perhaps these are amongst the quirkiest biological terms!
Sawflies are close relatives of wasps, but have thick waists and lay their eggs in the leaves of plants using a saw-like ovipositor from which they take their name. I found a black sawfly on the old flower stalk of a Plume Grass.
Also on an old grass stem, I found what I think is a Stenophyella bug nymph. These bugs are in the family of Lygaeid bugs, which feed mainly on seeds and plant sap. I think this one is a nymph due to the underdeveloped wings.
Back at the usual Hardenbergia a few days ago, I found numerous tiny Jumping Spiders (<2mm long), all of the same species. I assume from their numbers that they’d just hatched. Each seemed to have their own leaf by the time I’d found them.
A few days later and I found one with a catch. The spider was still only a couple of millimetres long and the fly it had caught was even smaller.
I’ve ‘known’ this old Yellow Box for more than three decades.
At various times it has been home to nesting Laughing Kookaburras, Brown and White-throated Treecreepers and Sacred Kingfishers … in some years simultaneously. I’m sure the tree is also home to bats, sugar gliders and who knows what else!
This season it’s the kingfishers that have returned to breed once again. An early morning visit showed that spiders (wolf spiders I think) were the favoured tucker. I witnessed at least 10 visits over the course of an hour where spiders were delivered to the nestlings. I find it remarkable that the kingfishers are dining out on prey that is completely invisible to me as I stumble through the bush.
Black-anther Flax Lilies have (Dianella revoluta) been flowering for a while in our bush. At present, they are bearing both flowers and fruits in our bush at Strangways.
Being blue, they are beloved by our local native bee species. Lipotriches bees are regulars at these flowers.
Lipotriches are sweat bees of the family Halictidae, nesting in burrows in the ground and attracted to the salt in human sweat – hence the name. The very helpful site aussiebee.com.au talks about the males of this genus gathering at dusk in large numbers on twigs or grass stems. I’ve yet to see this, but would love to.
Much smaller Halictids of genus Lasioglossum are also visiting the flax-lily flowers.
These tiny bees are also enjoying the Digger’s Speedwell flowers that are also still blooming.
In amongst the flowers, I saw something that looked and behaved like a hoverfly, but seemed too big. When I got a close look through the macro lens, the mystery was solved.
Shiny Everlastings are also in full bloom. I found a little Lacewing larva lurking on one flower, presumably looking for prey.
Away from flowers, the leaves are also busy places. Leaf Beetles are munching busily.
ARACHNOPHOBE ALERT – SPIDER PHOTO AHEAD!
The truth of life for any animal who’s not a top order predator is that their is always someone looking to turn you into a meal. NO exemptions for cute little leaf beetles.
As spring unfolds, I’m seeing a lot of invertebrates around our place at Strangways that I’ve not seen since the end of autumn. Various species of wasp are around and most have been a bit camera shy, but one was happy to pose.
I think this little cutie is a Brachonid wasp, but I’m happy to be corrected. Other Brachonids are definitely waking up at the moment. The ovipositor on this one was just too long to include fully in the photo. Brachonids often use these to deposit their eggs into the bodies of Sawfly larvae that the wasp larvae will eat from inside. Over millenia of evolution, the timing of the emergence of the adult wasps has been perfected as I’m starting to find quite a few schools of Sawfly larvae munching on eucalypt leaves.
These larvae have appeared on the same trees that I found adult Pergagrapta Sawflies last autumn, so I wonder if they are the same species.
Caterpillars are increasing in diversity. There are still a lot of Chlenias moth caterpillars about, but not as many as a few weeks ago when I posted about them. They have been joined by some other interesting caterpillars.
As I was inspecting a Grey Box sucker looking for subjects, I couldn’t help but notice one leaf stalk that seemed to be pointing the wrong way. As I watched, things started to change.
I have no idea what species this little caterpillar was, but I am lost in admiration for the camouflage.
Another very successful strategy for a juicy caterpillar is to look spiky and unappetising. This one was on a Black-anther Flax Lily flower stalk.
Lacewings are also starting to appear in greater numbers and variety.
I always like looking at Hoverflies, with their elegant shapes and steady hovering flight. Lots of them are now investigating the flowers in the yard and bush. This one was very sedate, resting on a Groundsel and so a good photo was pretty easy.
ARACHNOPHOBE WARNING – A SPIDER FOLLOWS.
Wolf spiders are also emerging from their holes in the ground. At night, their beautiful emerald eyes shine in the glow of my headlight. These spiders tend to carry their babies on their backs, which I’ve never managed to get a photo of. They still make an impressive subject for a close-up, in-your-face portrait.
I wish I was more of an early riser … sadly I’m not.
On the rare occasions that I make the effort it is almost always richly rewarded. Yesterday was a foggy start in the Muckleford bush as bird calls rang out around me – Eastern Yellow Robin, Pallid Cuckoo, Black-chinned Honeyeater and Golden Whistler were stand-outs.
As the first rays of sun broke through the fog, a few birds … including the Fan-tailed Cuckoo pictured below, soaked up the warmth before beginning their morning foraging.
Birds are almost always easier to observe and photograph at this time of day, allowing a closer approach and often performing some interesting antics.
Tunnel Track, Muckleford State Forest, 5th September 2020
A wander into the grassy woodland at our place the other night led to some interesting encounters and a puzzle with a solution reminiscent of science fiction.
Focusing my attention on the Poa and Austrodanthonia grasses, I was impressed by how many invertebrates were either sleeping, feeding of hunting on them. And it seems that a lot of insects are waking from their winter down time. I was delighted to find a tiny Praying Mantis nymph, all of 15mm long.
I also found quite a few leafhopper nymphs.
One activity that I forgot to list was mating. A pair of moths were busy organising the next generation.
Tussock grasses seem to be a favourite spot for small flies and wasps to sleep.
Katydid nymphs are also starting to emerge. A Twig-mimicking Katydid (Zaprochilus) was doing its best to look inconspicuous.
When this nymph is an adult, its wings will project strikingly upwards from its thorax, looking like a forked twig. As a nymph, theu are tiny buds just discernible.
I found another Katydid nymph not far away.
Hanging on a silk thread between two grass strands, I found a fungus gnat with a large, swollen and very red abdomen. My guess is that she’s heavily pregnant, but would be happy to hear any more informed explanations.
Cup Moth larvae have started making their appearance.
On the ground, perhaps knocked off a wattle as I moved around, I found an exquisite green moth. I assumed it has a relationship with wattles or eucalypts, but I discovered that its a Native Cranberry Moth (Poecilasthena pulchraria) and its caterpillars feed on native cranberry bushes (Astroloma).
A small bug on one tussock looked to me like a Mirid Bug nymph.
Other larval forms about are, of course, caterpillars. Chlenias are still very abundant, but not in quite the enormous numbers of last week. I was puzzled that a small percentage of them seem to have small parcels stuck on their backs. One suggestion is that it might be the skin from a previous shedding that hasn’t come unstuck yet. I’d appreciate any thoughts.
Another caterpillar similar in size and shape to Chlenias was magnificently camouflaged.
One fly that I found on a Golden Wattle leaf had me really puzzled. It didn’t look dead as its eyes were quite clean, but it was quite immobile and had a lot fuzz on its abdomen. Its wings and legs were in a very odd posture.
A bit of research led me to the fungus Entomophthora muscae, which as its name implies specialises in flies. When the spores come into contact with a fly, they have enzymes that break through the skin of the insect, allowing the fungal threads to spread through the fly. The fungus digests the organs of the fly and as the fly gets sicker, the fungus alters it’s brain function to make the hapless insect climb to a high point on a leaf, stretch its wings and legs. All of this sets the fly up perfectly for the next step. The fungus by now has spread microscopic canons over the abdomen and these will shoot spores out for them to land on the next victim. The wing and leg positions optimise the range of the spores.
And of course, where there are insects, there are those that eat them. Especially spiders. Like a baby Huntsman, about 10mm long.
Autumn has seen a lot of Robber Flies at our place. I love getting photos of these amazing looking animals – they certainly look like they come from the realms of science fiction. So far I’ve had little luck getting shots of them as they have been very restless. In the cool of a recent afternoon, I was pleased to find one perched very sedately on a Cassinia bush.
Perhaps it was the cool conditions slowing it down, but I was able to get some good close up shots. They are called Robber Flies as they grab their prey in their strong claws and whisk them off somewhere safe for a feed
Looking a bit otherworldly
There are also a few small Leaf Beetles of various types about at the moment and they are heavily favouring Golden Wattles (Acacia pycnantha) and especially their developing flower buds.
.Leaf Beetle on Golden Wattle
Nocturnal excursions into our bush have also yielded a few finds. One was a small wasp, about 10 mm long snoozing on a native Clematis in our yard.
And here is the spider warning for the arachnophobes!
Most of the Huntsman spiders that we encounter tend to be fairly large specimens and quite impressive. However, when I’m snooping around the bush at night, I often encounter quite small ones that I assume are young examples of the larger varieties, as they look so similar. These small spiders are usually hiding on a leaf of some type. Although the one I’m presenting here looks very imposing, it was only about 20 mm across.
With the cooler weather and rain, it’s been a little challenging getting invertebrate shots. Wolf Spiders (Lycosa sp) are often out and about on the ground at this time of year, emerging from their burrows to hunt on the surface. They are also easy to find at night as their eyes reflect back a brilliant emerald shine towards my headlight. I was surprised and delighted to see that after a shower of rain, they all seemed to carry a miniscule droplet or two right on the crowns of their little heads. Its as if the hairy projections on their skin seem to gather the water in one place.
Wolf Spider with droplet
On the same damp evening, I found a Bee Fly (Geron sp.) fast asleep on the nascent flower bud of a Golden Wattle, and this one seemed to have a tiny droplet on each side behind the head.
Bee Fly with water
After things had dried off a bit, I found the Black-headed Sugar Ants (Camponotus nigriceps) still tending their crop of Scale Bugs.
Black-headed Sugar Ant with Scale Bugs
When two workers meet, they touch antennae to check the chemical signal that they are from the same nest.
By day, Meat Ants (Iridomyrmex purpureus) are out and about. In the cool weather, they are less frenetic than in summer and it’s far easier to get some photos with my single focal plane supermacro lens (ie you have to move the camera to focus). These ants live in every mainland state. Numbers in a nest – or complex of nests, as one colony may have several nests – vary from 11,000 to 300,000 and apparently large nests in the outback can be picked up on satellite photos.
They are broadly omnivorous, harvesting honeydew from bugs, collecting seeds and eating the flesh of dead animals – vertebrate and invertebrate. They are very important for germinating some seeds and a single nest can disperse up to 300,000 seeds.
With the right light, you can see some of the internal structures of the ant’s head.
I was impressed by the efforts of one of these ladies as she carried quite a large stick around the nest. The nest is on a steepish slope near our dam and she struggled mightily to drag it around. I never saw her trying to get it into the the nest. The ants go to a lot of trouble to surround their nest with gravel and debris, so maybe it was part of that?
An impressive labour
One of her sisters had nearly as much trouble moving a tiny pebble around the nest area, but she did eventually drag it into one of the many entrances to the nest.