Rebugging our Community

by Katelyn Rinicker | Nov 22, 2024

Insect populations have dropped drastically over the last few decades. Bugs are the building blocks of our environment and provide many benefits such as beautiful flowers, food sources, soil aeration, and more. We can help these little creatures flourish by rebugging our community. I could spout science facts all day long about how insect populations have dwindled, you have likely already noticed.

When I was younger, we would visit my grandparents who lived 2 hours away. We would have to stop at least once to clean our windshield. Now I can drive over 6 hours to visit my parents and never have to clean my windshield. Or maybe, you have noticed that there aren’t as many Monarch butterflies as you used to see. We used to take walks and have a hard time not stepping on grasshoppers and we used to see fireflies every night. Now there seems to be a fraction of insects around as there used to be. According to Hallmann et al, insect biomass has declined by 74% – 83%. Many insects are beneficial and are not considered pests. They decompose plants, animals, and fecal matter. They aerate our soil, provide a food source for other animals, and pollinate our plants.

Why are they declining?

This is a tricky question as their decline is not caused by just one thing. They are dying a death by a thousand cuts. Habitat fragmentation and degradation, pollution, pesticide use (especially Neonictonoids), loss of native plants, light pollution, climate change, and many other reasons. Some species of insects need specific food sources or plants to lay their eggs on. Iowa has lost over 99% of its native landscapes, meaning it has become increasingly difficult for insects to find their host plants and habitats.

Insect Decline in the Anthropocene: Death by a Thousand cuts by Wagner et al assesses the metadata surrounding insect decline.

What can we do to help?

While this decline is very alarming, we can all help “rebug” our world.

If you have a minute:

Don’t kill the bugs that have found their way into your home; instead, relocate them outside. If you don’t want to touch them, you can safely handle them with a piece of paper and a cup.
Reduce pesticide use, or better yet, stop using it altogether – pesticides harm all insects, not just the small percentage that are considered pests

Or use alternative methods such as putting food in containers so it is not available to insects
Or put soapy water, cinnamon, lemon juice, or mint around the holes that they seem to be coming in at
If you MUST kill them, use boiling water or cornstarch instead of chemicals
Be untidy in your garden! Insects use weeds, old plant stems, wood, and leaves
Reduce outdoor lighting – you can do this by incorporating motion sensors. Insects and a variety of other animals use the stars as navigation. Constant outdoor lighting disrupts and confuses their natural systems.
Keep lawn grass longer – this provides shelter and a food source

If you have more time:

Plant native gardens – this provides food sources and habitat, it also helps to connect habitats as insects can only travel so far before needing a break and a snack
You can do this in containers, your yard, window boxes, or anywhere there is a little bit of space!

Plant host plants – such as milkweed for monarch butterflies
Grow your own produce – the flowers are great sources of nutrients for insects
Compost – an open compost pile provides warmth, habitat, and food for invertebrates

You can also use compost systems to build up soil health!

If you have a lot of time:

Advocate for policies that promote re-wilding the state. This helps protect and create more natural areas. Write to your local, state, and federal governments to explain the importance of policies protecting insects and wildlife.
Talk to your boss and landlords about creating native gardens
Join community groups that support insects!

“The loss of even a small percent of insects might also be disproportionately consequential. They sit at the base of the food web; if they go down, so will many birds, bats, spiders, and other predators.”
– Ed Young

Tallgrass Prairie – A View from the Fly on the Gall

by Jessica Butters | Jul 13, 2023

The North American Prairie Conference was a big conference (638 people from 24 states and 2 countries) but not all the sessions dealt with big mammals, tall grasses, and wide open spaces. During a break from working the registration table, I caught some delightful talks by MJ Hatfield and Chris Helzer about the tiny creatures you can meet and the stories you can learn if you “walk slow, look close, and be curious” – MJ Hatfield.

Howdy! I’m a goldenrod gall fly (formally, Eurosta solidaginis). Have you ever seen flower stems with an odd, ball-shaped growth? These round growths are called galls, and if you’ve seen one on goldenrod, I may have been the architect that created it. But what exactly is a gall? To me, a gall is a highly specific and comfy nursery, created with a little hijacking (picture to the left © MJ Hatfield).

A gall can be about anywhere on a plant, including flowers and leaves, and are created by hijacking the plant’s hormones. You read that right. I’m a hormone hijacker. In spring, before I was born, my mother inserted her egg (me!) into the goldenrod’s stem. Later, when I hatched into a larva inside the goldenrod, I started eating the inside of the stem. My saliva contains chemicals that trick the plant into thinking the saliva is its own hormones. My saliva signals the goldenrod to grow more tissue in the feeding area (or nursery, as I like to call it). The goldenrod ends up creating a beautiful, round nursery. In short, I’ve built my very own gall. I’ll eat and grow in this goldenrod gall throughout the summer until fall. In autumn, I chew a tunnel near the outside of the gall and then pupate, waiting until spring to emerge. But how the heck am I supposed to get out of the gall?!

This is where it gets seriously interesting. I have an air bag like structure on my head between my eyes. I inflate this air bag against the gall, and bam! I break through, seeing the outside world for the first time. Also, this whole process doesn’t hurt the goldenrod. It nearly always flowers like normal and continues enjoying life as a goldenrod plant.

My species can’t survive in any other plant. Because I’m a weak flier, I will probably stay in the same neighborhood that I grew up in. I hope nothing happens to this patch of goldenrod…I’m not sure if I could make it to a different prairie patch. Maybe if there were more prairie plantings, it wouldn’t be so drastic if changes came to my neighborhood. The prairie restorations could act as a safety net.

Goldenrod gall with gall fly, by MJ Hatfield

As the goldenrod gall fly, my entire life and future requires the presence of goldenrod. And I’m not the only one! At least two moth species also make galls on goldenrod. There are quite a few bees that rely solely on goldenrod pollen. You might think we are picky, but can you imagine how hard it is to find a home that you can not only live in, but also eat? And us gall flies have to develop specific chemicals in order to hijack specific plant hormones to even make our home and food. It’s very complicated, and we can’t just change all that with a snap of our wings!

Stiff leaf goldenrod, photo credit Dan Haug

Many people now know that monarch caterpillars can only eat milkweed, and are planting gardens with milkweed to help them. That’s great, but monarch butterflies are not the only insect that needs a certain plant for food or shelter. Sawtooth sunflower has four different species of gall-forming insects that dependent upon it. The blue sage bee requires pollen it can only get from blue sage flowers. Swallowtail butterflies rely on plants in the carrot family (such as golden alexander). Make room for a diverse prairie planting and you could be supporting ten times as many species of insects, many of them so small or well-camouflaged that few people have ever met them!

The Love Lives of Moths: Competition in the Air

by Jessica Butters | Feb 6, 2023

Forget about buying roses – in the great words of Shania Twain, “that don’t impress me much”. To impress me, you’d have to match the energy of male moths. Instead of dropping cash on last-minute flowers, male moths are willing to fly miles for a first date, dodge dangerous predators, and out-compete other males, all while most humans are fast asleep.

But how exactly do moths find each other? Many are nocturnal, some aren’t brightly colored, and they can be tiny*. Plus, female moths generally stay put and let the males come to them. So what is the male moth’s secret to finding love in the black abyss of a night sky? The key is their incredible sense of “smell” through their unique antennae!

If you’re looking at a moth, the antennae may tell you if it’s a male or a female. Female moths often have the two simple strands of antennae that we are used to seeing on many insects. It’s the male antennae that are interesting; some, though not all, have antennae that look like a pair of feathers, each one having many branches covered in fine hairs. These feather-like antennae quite literally comb the night air in search of the calls of female moths, which are sent in the form of pheromones**. Male moths from larger moth families (e.g. giant silk moths) can detect a single molecule of female pheromone from seven miles away! Imagine if you could find a compatible stranger based on smell alone, or attract one using a drop of perfume. Though odd, it seems simpler than using dating apps; but is it truly easier?

Distance isn’t the only threat to a male moth striving to be lucky in love. Once his antennae detect a female call of his species, he has to find her – fast. Other males may have picked up the female’s call as well, and many female moths only mate with the first male she encounters. There is no prize for second place. To hone in on her location, males often fly in the cross-winds to try to detect more pheromone. Once a call is detected, he flies in that direction until the pheromone fades yet again.

During this high-stakes game of Marco Polo, moths also have to dodge hungry predators, such as bats. Different moths have different strategies for this. They may taste bad so they are spit out instead of eaten, have evasive flight maneuvers that would impress any Top Gun fan, or have incredibly fuzzy bodies that absorb sound. This weakens a bat’s attempt to use echolocation, giving the moths a cloak of invisibility.

A moth’s antenna seen through a microscope. Note that it is covered in fine hairs!

While the journey to mate may be arduous for males, female moths have their own complex decisions to make. Female moths only release small amounts of pheromones in hopes of attracting male moths with very sensitive antennae, which indicates they are fit and healthy. Additionally, she only mates with the first male to find her to ensure he is a strong and fast flier, another indicator of good health. Female moths don’t have genetic material to waste on mediocre males – they put high amounts of energy into creating their eggs. However, if the mating period goes on and the female hasn’t attracted a mate, she will start releasing higher amounts of pheromone. This intensifies her call, making her easier to find. Besides intensifying her call, the female can also tailor when and how often she calls. These strategies help ensure that she receives the best male possible and that her energies were not spent in vain.

The world of moths remains a mystery to most people. Considering the intricacies and drama involved, it deserves to be a topic of regular discussion! If you are at a loss of what to talk about at your next Valentine’s Day date or gathering, consider bringing up moth mating. It’s sure to add interest to an otherwise trite Tuesday.

*Some moths are diurnal (active during the day), many are brightly colored, and some species are huge!

**Pheromones are chemicals released by animals that change the behavior of other animals of the same species.

Which Insects are “Home for Christmas”?

by Jessica Butters | Nov 22, 2022

Insects are conspicuous by their absence during Iowa’s winter months. Absent are the beauty of butterflies, and we would be shocked to hear a bee buzzing around our snowy apartment balcony on Christmas Eve. So where did they all go? Did they perish from freezing temperatures? Have they all migrated south with the eastern monarch butterflies?

Here in Iowa, we have many insects that use truly astonishing techniques to stay here throughout the winter, braving the cold with the rest of us. From smart hiding places and suspended animation to making their own antifreeze, Iowa’s insects have developed some pretty wild adaptations to weather the winter!

Note: Iowa has many insects that undergo “suspended animation”, technically called diapause, to survive winter. Diapause is an insect form of hibernation where the insect pauses development; it stops maturing and halts all activity. It remains in its’ current life stage (which could be egg, larva, nymph, pupa, or adult) until conditions become favorable again and they can continue growing or start mating/laying eggs.

Wooly bear caterpillars: These fuzzy little guys will mature to become the Isabella tiger moth. They stare winter down by allowing themselves to freeze, but on their own terms! They seek shelter under logs and leaf layers. Once safe, they go into diapause and slow down the freezing process by creating glycerol, a natural alcohol and one of the many insect forms of “antifreeze”. They slowly allow their entire bodies to freeze except the insides of their cells.

Black swallowtail butterflies: These beauties stay cozy in their chrysalis while the snowflakes fall, entering diapause at the pupal stage. Their chrysalis mimics a dead leaf to keep them safe from predators, so be careful when cleaning up your lawn – especially if you grew dill, parsley, or other plants related to carrots in your garden! If you must move leaves, try not to chop/mow them to ensure you can enjoy the swallowtails next summer!

Dragonflies: Dragonflies brave the winter in a few different ways depending on the species. Some overwinter as eggs laid in logs near ponds, and others actually migrate. But one of the coolest ways some overwinter is as underwater nymphs (an immature stage of a dragonfly)! The dragonfly nymphs stay underwater beneath insulating ice layers, where they are voracious predators true to their namesake (even eating small fish!). They eat and grow throughout the winter until they can emerge as adults in the summer.

Flower flies: Also known as syrphid flies or hover flies, flower flies are a family of flies (called “Syrphidae”) that are fantastic garden helpers: when young they eat aphids, and as adults they pollinate. Here in Iowa, they’re commonly referred to as “sweat bees” due to their black and yellow stripes and the fact that they sometimes land on sweaty humans (sweat contains good nutrients for them). However, these flies only mimic bees, and cannot sting or bite (their mouth basically consists of a tiny mop). They survive the cold much like other insects; they find shelter in leaf layers and other plant material, enter diapause and overwinter as a larva, pupa, or adult depending on the species. Flower flies are no pansies!

Bumble bee queens: Bumble bee hives only live for one year, unlike honey bees. Near the end of the hive’s life, new queens and male bees (“drones”) hatch and leave the hive to mate. When hive activity finally ends, the drones die while the newly-mated queens search for a warm winter home alone. Their new homes could be in leaf layers, warm compost piles, or just a few inches underground in a sheltered place! While winter winds howl, the entire fate of next year’s bumble bee hives rests on these young queens surviving the winter all alone. When it warms again, if all goes well, they will wake from diapause and emerge to start their very own hives to begin the cycle again.

How Can You Help?

As you can see from these few examples, surviving winter is key to us enjoying pollinators and other insects next year. So many insects rely on the shelter of leaves, logs, and other materials to block the cold wind and insulate them from freezing temperatures. Therefore, one of the best ways to help pollinators this winter, and to ensure there are pollinators this summer, is to find a place in your yard or balcony where you can let leaf litter and plant material accumulate. Think of it as a Cozy Corner that may harbor young bumble bee queens, sleeping swallowtails, and fuzzy wooly bear caterpillars. Give insects the gift of cozy this holiday season!

See below for more information on how to build your very own Cozy Corner:

Create a “Cozy Corner”
You can create a “cozy corner”, or brush pile, for pollinators throughout the fall and winter by choosing a location to leave leaf litter undisturbed. You can add twigs, branches, and other brush to the pile as you clean up the other areas you want clear of brush. You can also leave potted plants on your balcony or patio and push them together to create a small shelter; I’ve found moths sheltering in my flowerpots in mid-fall, and I’ve noticed more bird visitors! Add layers of brush to your cozy corner to provide the best shelter possible. Click here to read the full article from which this paragraph was based on.

How-To Guides to Create Your Very Own Cozy Corner:

Bird Brush piles: The Audubon Society’s Website

General Wildlife Brush pile: Article by the Wisconsin DNR

New Pollinator Conservation Specialist Jessica Butters Joins PRI Staff

by Mike Kellner | Mar 30, 2022

Prairie Rivers of Iowa’s new Pollinator Conservation Specialist Jessica Butters’s background includes extensive knowledge about Iowa’s ecosystems and native bee conservation. She’s a graduate of Kansas State University (KSU) with a Master’s of Science in Entomology and recently completed work as a research assistant organizing and analyzing a large dataset concerning native bee presence in soybean in fields.

“We are thrilled to have her join our staff and look forward to some significant contributions towards pollinator and native plant habitat creation, restoration and education throughout Iowa,” says Executive Director Penny Brown Huber.

Jessica has a history of collaboration that will serve her well in this new position. As a part of the team at Kansas State, she has co-authored publications on topics ranging from Providing for Pollinators: Conserving and Integrating Natural Habitats to Native Flowering Border Crops Attract High Pollinator Abundance and Diversity. At KSU she managed two projects that gave her and others a greater understanding of native plant and insect interactions, and landowner viewpoints towards conservation efforts and practices.

Connecting with the public is an area of expertise Jessica honed while serving as an insect zoo tour guide at KSU and as a private tutor where she was able to synthesize scientific information into something simple, fun, and informational to school children and diverse audiences. Central Iowa audiences will get their first taste of her expertise during the Ames Public Library’s Birds, Bees and Pollinators EcoChat on April 28.

Besides being a great presenter, Jessica’s scientific skills are impressive as well. She is just as comfortable while conducting research and analyzing data, creating maps using ArcGIS and R, identifying native pollinators and plants, talking about sustainable agriculture or creating the perfect bee house. They are skillsets that are critical when considering the challenges pollinators currently face in Iowa and beyond.

Please welcome Jessica to the Prairie Rivers team, and “bee” sure to reach out, say hello, and call upon her expertise when you need assistance with your next pollinator garden, native prairie restoration, or educational event.

During the application process, Jessica related, “I believe my research experience, passion for public relations, and solid bee and Iowa ecology background, blend perfectly together for this position.” We could not agree more!