Kim and I sat by the creek and watched the ants. What a lovely way to pass an hour.
Liometopum occidentale
Tag: insects
notonectidae
The lower parts of Solstice Creek are well-visited, but not many people climb Sostomo Trail to enjoy the gorgeous crossing on the upper creek. The three of us settled into a bed of fallen sycamore leaves and enjoyed the quiet shade. I liked seeing the little backswimmers (Notonectidae family) — I’d also observed these aquatic insects in Australia.
Backswimmers, as the name implies, swim inverted, using their long hind legs to paddle vigorously. They prey on organisms as large as tadpoles and small fish and can deliver a painful “bite” to humans—actually a stab from their sharp proboscis. These insects inhabit still freshwater in lakes, ponds, and marshes, and can also be found in garden ponds and occasionally in swimming pools. Despite being primarily aquatic, backswimmers are effective fliers, allowing them to easily disperse to new habitats.
Libellula saturata
I sat beside Century Lake and watched this bright little dragonfly return over and over to the same piece of bent grass. I decided she must want her portrait painted, so I obliged.
Pieris rapae
Our most common garden butterfly is one that does not delight me. The cabbage white has a natural range across Europe, Asia, and North Africa. It was accidentally introduced to Canada around 1860 and spread rapidly throughout North America. Estimates show that a single female of this species might, in a few generations, be the progenitor of millions.
That’s a lot of caterpillars eating my brassicas 😖
Chrysocus cobaltinus
This iridescent little beetle (about 8mm long) was on a milkweed plant at the Park yesterday. So bright and metallic!
Both adult and larvae C. cobaltinus life stages eat dogbane and milkweed species. These plants contain toxic molecules known as cardenolides, which the beetle is resistant to. In fact, it stores the cardenolides in its glands, and uses them against predators.
Cobalt Mikweed Beetles are similar to click beetles in being able to launch themselves a couple of times the length of their body. Little but mighty!
Libellula saturata
The water in the pool is getting really low; in a few more weeks it will have evaporated completely. I was observing some rather large organisms running about under the murky water, and wondering what they were. I was distracted by some mating flame skimmers overhead, and watched as they completed their copulation and the female proceeded to repeatedly dip the end of her abdomen in the water.
Now that I’ve done a little research on flame skimmers, I’m pretty sure that the critters I see underwater are the dragonfly’s nymphs. Hopefully they’ll have time to metamorphose before their habitat disappears for the season.
Tipuloidea
Mosquito hawk. Skeeter-eater. Gallinipper. Gollywhopper. Jenny longlegs. Daddy longlegs. Crane flies are found all over the world and go by many different names. There are several common misconceptions about these insects:
- That they are the most venomous insects in the world (in fact, they have neither venom nor the ability to bite).
- That they prey on mosquito populations (also untrue; the adult crane fly is anatomically incapable of killing or consuming other insects).
Crane fly larvae can be important in the soil ecosystem, because they process organic material and increase microbial activity. Larvae and adults are also valuable prey items for many animals, including insects, spiders, fish, amphibians, birds, and mammals. However, the larvae of some crane fly species are agricultural pests, as they feed on the roots, root hairs, crown, and sometimes the leaves of crops. But mostly, these giant, delicate creatures are completely harmless.
buzzfeed
I’d seen a tuning fork used to trigger pollen ejection from nightshade flowers, but an electric toothbrush is cheaper and more accessible for demonstration purposes. I might add one to my school walks kit.
Ichneumonidae
Ichneumons are a diverse group of parasitic wasps. Female ichneumons lay their eggs on or in a living host, usually an insect or spider. When the larvae hatch, they begin to feed on the host, frequently eating it in such a way as to allow it to remain alive for as long as possible, permitting the larvae to complete their development. The host is literally eaten alive.
In 2019, a group of international entomologists suggested the name “Darwin wasps” for this family, in reference to a famous letter that Darwin wrote in 1860 to American botanist Asa Gray. He wrote: “I cannot persuade myself that a beneficent and omnipotent God would have designedly created the Ichneumonidae with the express intention of their feeding within the living bodies of Caterpillars, or that a cat should play with mice.” (Darwin solved this vexing issue by saying that there is no solution. Nature is not cruel or evil, and does not exist to offer us moral lessons; it just exists.)
Gross as endoparasitism sounds, these wasps play an important role in regulating insect populations. This specimen was in my dining room … looking for caterpillars??
Orgyia vetusta
The deerweed on the hills at Leo Carrillo is being absolutely denuded by Western Tussock Moth larvae. Shrub after shrub along the trail has been stripped to bare stems, while others show a thick population of caterpillars munching away with abandon.
Orgyia vetusta is native to western North America, and is considered a pest by many because of the speed at which the caterpillars can defoliate a tree. They‘ve been reported on virtually all California oak species as well as various fruit and nut trees, ceanothus, hawthorn, manzanita, toyon, walnut, and willow. And deerweed!
The defoliation wrought by these caterpillars can trigger a chain reaction in ecosystems. Trees and plants serve as vital resources for numerous organisms, and their decline can throw food chains into disarray and diminish biodiversity. Tussock moth caterpillars have several natural predators, including birds, parasitic wasps and predatory beetles. Here’s hoping that the population reaches a healthy stasis at Leo Carrillo.
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