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Home Science

More than 1,000 species live in and around an ordinary suburban house, survey in Australia shows.

December 9, 2023
in Science
More than 1,000 species live in and around an ordinary suburban house, survey in Australia shows.
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Dot-underwing moth (Eudocima materna) found in the researchers' yard.

Dot-underwing moth (Eudocima materna) found in the researchers’ yard. (Image credit: Matthew Holden, (CC-BY))

We are biodiversity researchers — an ecologist, a mathematician and a taxonomist — who were locked down together during the COVID pandemic. Being restricted to the house, it didn’t take long before we began to wonder how many species of plants and animals we were sharing the space with. So we set to work counting them all.

We guessed we would find around 200 to 300, and many of our colleagues guessed the same.

There was nothing extraordinary about our 400 square meter [4,300 square feet] block of land in Annerley, a suburb of Brisbane in Queensland, Australia. Roughly half the block was occupied by a three-bedroom house.

What was extraordinary was the number of species we discovered there. As revealed in our just-published study, starting on the first day of lockdown and continuing over the course of a year, we catalogued 1,150 species on our inner-city property.

Familiar faces and rare recluses

Many of the species were what any east coast suburban Australian would expect: ibises, brush turkeys, kookaburras, possums and flying foxes. But, surprisingly, others had rarely been recorded.

In fact, three of the 1,150 species had never been documented in Australia’s leading biodiversity database at that point. This included a rare mosquito, a sandfly and an invasive flatworm that can cause populations of native snails to decline.

We found common foes, but also many friends. That rare mosquito was just one of 13 mosquito species we found. The cupboards accommodated pantry moths and grain weevils, but also spiders to prey on them (we recorded 56 species).

Our lack of assiduous garden-tending meant weeds were prolific; of the 103 plant species we documented on the property, 100 were non-native.

Apart from weeds, however, the vast majority of species were actually native. Our two massive lilly-pilly trees provided shade, shelter and food, magnets for numerous pollinators and other species.

Bees and butterflies

Blue-banded bees sleep grasping plant stems with their mandibles.

Blue-banded bees sleep grasping plant stems with their mandibles. (Image credit: Andrew Rogers)

The yard was filled with pollinators. For example, there were hoverflies which, at a quick glance, you’d think were wasps. We had 10 species of those, a fraction of the more than 109 species of flies we found.

Native blue-banded bees and fluffy teddy bear bees roosted in the hedges under our windows at night. They were just two of more than 70 bee and wasp species we observed.

We also counted a mindblowing 436 species of butterflies and moths. A few were as large as a human hand, but most were tiny and barely noticeable. Some were brightly coloured, while others — like the vampire moth Calyptra minuticornis — seemed boring until we began to study their behaviour.

Related: All butterflies evolved from ancient moths in North America 100 million years ago

Say hello to our #vampire moth, Calyptra minuticornis! It mostly pierces fruit, but vampire moths get their name from the fact that they also have been observed sucking the blood of mammals. No threat to humans though. #StayHomeBiodiversityChallenge @UQ_CBCS pic.twitter.com/kgVwSHG5jJApril 20, 2020

See more

The moth Scatochresis innumera is another interesting one: as a caterpillar, it lives inside a single possum poop before emerging as an adult.

The caterpillars of Parilyrgis concolor, yet another moth, live in spiderwebs, surviving on the spider’s food waste, while the adults can be found hanging bat-like from the spiderwebs. It is not known how they avoid getting eaten by the spiders.

The caterpillars of the moth Parilyrgis concolor live in spiderwebs, and adults often hang from webs like bats.

The caterpillars of the moth Parilyrgis concolor live in spiderwebs, and adults often hang from webs like bats. (Image credit: Russell Yong)

Wasps and beetles

We recorded ten species of lycaenid “blue” butterflies, many of which use ants to protect their caterpillars from predators, including certain wasp species which would lay eggs in them if they got a chance.

These wasps are called parasitoids — meaning their young develop in other organisms, eventually killing them. Some of these wasps even parasitise other parasitoid wasps. Our urban homes are clearly complex ecosystems.

We were surprised to only find just under 100 beetle species (the fourth most common group of organisms in our study). Beetles are widely believed to be the most diverse order of insects on the planet.

Our finding may be a sign of declining beetle populations, which has been observed around the world. On the other hand, it may just have been a bad year for beetles in our neighbourhood.

A tiny Braconid wasp that parasitises other insects.

A tiny Braconid wasp that parasitises other insects. (Image credit: Matthew Holden)

An urban environment teeming with life

Overall, we found far more species than we expected, and we showed that even urban environments can be teeming with wildlife.

A big reason for that was surely the vegetation: the shrubs, trees and weeds in the yard. The monotony of perfectly tended lawn and heavily sprayed and manicured flowerbeds may be nice to look at and for the kids to play on but, as habitat for urban wildlife, it is lacking.

Our own laziness meant we did little work in the garden. However, by giving the mower and pesticides a break, and by sacrificing some lawn for native trees, shrubs and flowering weeds, we ended up with something much more valuable.

But no matter what you do to maintain your home, definitely check your porch or balcony light tonight, and keep your eye out for urban wildlife around your home. You too can experience some pretty amazing nature, no matter how urban the environment you live in.

This edited article is republished from The Conversation under a Creative Commons license. Read the original article.

Stay up to date on the latest science news by signing up for our Essentials newsletter.

Dr. Holden is a Lecturer and Research Fellow at the University of Queensland in the School of Mathematics and Physics.

He develops quantitative approaches to solve challenging problems in environmental management. This includes how to cost-effectively search for invasive species, save threatened species, protect natural ecosystems, and harvest fish sustainably. He is currently conducting the first-ever stock assessment for Torres Strait coral trout and is also studying the dynamics of illegally harvested wildlife (e.g. elephants poached for ivory).

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