Category Archives: Insects, Fish, Frogs

Bug On My Front Porch

Larger than life, a western conifer-seed bug in Pittsburgh, 30 Oct 2019 (photo by Kate St. John)

Insects that disappeared in the cold came out again during last week’s warm weather. On Wednesday I found a western conifer-seed bug on my front porch.

Formerly restricted to the western U.S., the western conifer-seed bug (Leptoglossus occidentalis, WCSB) has spread across North America, to Europe and South America. At 1/2 to 3/4 inches this “true bug” sucks the sap of developing pine cones and the pulp of pine seeds.

WCSB can see pine cones from afar in glowing infrared colors so this one was probably lured by the cones on my neighbor’s blue spruce.

After he ate, he needed to find shelter. Wednesday’s warmth was followed by record rain on Thursday and cold wind on Friday.

Western conifer-seed bugs overwinter in a bark crevice, a dead tree, or a house. My house. I didn’t know they came inside until I researched this article. By then the bug had disappeared.

Western conifer-seed bugs stink when they’re disturbed. … Great. I can hardly wait.

(photo by Kate St. John)

A Brief Change Of Scene

The view from Fort Hill at Cape Cod, 18 Oct 2019 (photo by Kate St. John)

Travel is a tonic for seeing the world in new ways. This month my husband and I spent a week with his sister at Cape Cod where we had new weather, new scenery and new looks at plants I might have seen at home.

Our timing was pretty good. We missed the October 12 nor’easter but were on hand for the October 17 “bomb cyclone.” We didn’t lose power, but it was still very windy on the 18th when I visited Fort Hill, pictured above.

Birds were hard to find that day so I noticed plants such as this European spindle-tree (Euonymous europaeus) with puffy, pink, four-sided fruits.

European spindle-tree fruits, 18 Oct 2019, Dennis, MA (photo by Kate St. John)

The puffballs are actually a casing that holds orange fruit within. This ornamental has probably been planted in Pittsburgh, though I’ve never noticed it.

Euonymous europaeus fruits burst open (photo from Wikimedia Commons)

My favorite discovery was a hole in a leaf.

Someone ate this, Cape Cod, 20 Oct 2019 (photo by Kate St. John)

Who ate it? Perhaps this caterpillar did. I found him elsewhere on the plant.

And finally, the sun touched translucent red berries and made them glow at Bell’s Neck.

The small plants have a single leaf midway up the stem (lefthand photo) and were growing among pine needles. I wonder if they are orchids … Perhaps green adder’s mouth (Malaxis unifolia)? Please leave a comment to tell me what they are.

(photos by Kate St. John except where noted in the captions; click the captions to see the originals)

Isabella Prepares For Winter

So many woolly bear caterpillars have crossed my path this fall that, fearing they’d be trampled, I have carefully moved each one across the trail.

“Woolly bears” are the larva form of a common North American moth, the Isabella tiger moth (Pyrrharctia isabella). Since she is not dependent on only one host plant, Isabella is found in many habitats.

She even lives in the Arctic, surviving the winter because she has natural anti-freeze in her cells. Wikipedia describes how she does it:

The banded woolly bear larva emerges from the egg in the fall and overwinters in its caterpillar form when it literally freezes solid. First its heart stops beating, then its gut freezes, then its blood, followed by the rest of the body. It survives being frozen by producing a cryoprotectant in its tissues.  In the spring it thaws.

from Wikipedia: Pyrrharctia isabella
A woolly bear’s face (photo by Kate St. John)

After she thaws in the spring, the woolly bear resumes eating, spins a cocoon, and becomes a flame-colored moth.

Isabella tiger moth perched on a finger (photo from Wikimedia Commons)

She’s rather large, but I don’t think I’ve ever seen her as an adult. Have you?

Adult Isabella tiger moth (photo from Wikimedia Commons)

I only notice Isabella as she’s preparing for winter.

Read about woolly bears — and what their stripes mean — in this vintage article: Isabella Scoffs At Winter.

(photos of woolly bear caterpillars by Kate St. John, photos of adult moths from Wikimedia Commons; click on the captions to see the originals)

Amazing Camouflage

This is not a leaf, it’s a butterfly (photo from Wikimedia Commons)

The orange oakleaf butterfly (Kallima inachus), native to tropical Asia, is well named. The underside looks exactly like a leaf when the butterfly closes its wings, and it has wet and dry season forms that mimic the leaves of each season.

The butterfly stands out when its wings are open.

Orange oakleaf butterfly (photo from Wikimedia Commons)

Watch it become a leaf as it flutters in place.

We have leaf-like butterflies in North America, too. Click to see the ventral and dorsal sides of the goatweed leafwing (Anaea andria). It ranges from southeastern Arizona to southern Ohio.

(photos from Wikimedia Commons; click on the captions to see the originals. video from Red Cache World on YouTube)

Monarchs Still Migrating Through Pittsburgh

Monarch butterfly in autumn (photo from Wikimedia Commons)

Though it’s nearly mid October I saw monarch butterflies migrating through Pittsburgh on Thursday and Friday October 10 & 11. Their timing seems late, but they were given a boost by August-like weather early this month.

You can follow their progress across the U.S. on Journey North’s monarch butterfly blog where you’ll find:

Today’s rain will put a damper on monarch migration in Pittsburgh but we can watch from afar as the butterflies make their way to Mexico.

(photo from Wikimedia Commons; click on the caption to see the original)

They Can Be Cannibals

Color variation in Asian ladybeetles (photo from Wikimedia Commons)

While writing about the worldwide spread of Asian ladybeetles (Establishing a Bridgehead) I learned another amazing fact. These insects are cannibals when they need to be, but they’re careful about it. They avoid eating close relatives.

Asian ladybeetles (Harmonia axyridis) are insect carnivores, preferring aphids above all else. Their population surges when aphids are plentiful and goes hungry when aphids crash. Rather than starve, ladybeetle larvae eat eggs and smaller larvae of their own species. The strong ones survive, indirectly regulating their own population.

However, they also make sure that their own family survives …

Interestingly, H. axyridis recognize their kin and are less likely to cannibalize a sibling than a non-related individual (Michaud, 2003). If normal prey becomes scarce, larval mortality can be very high, with in excess of 95% of larvae failing to survive to adulthood, and in such circumstances cannibalism can be essential for survival.

— Invasive Species Compendium, Harmonia axyridis

I’m not surprised that they eat each other, but I’m amazed that they recognize their relatives and avoid eating them.

(photo from Wikimedia Commons; click on the caption to see the original)

Further reading:

Establishing A Bridgehead

Asian lady beetles in the Netherlands (photo from Wikimedia Commons)

Now that the weather has changed unwelcome insects will invade our homes including Asian ladybeetles (Harmonia axyridis) that resemble native ladybugs but don’t act like them. Also called “harlequin ladybirds,” they overwinter indoors, make a stink, and bite when frightened.

A hundred years ago we thought this bug was a great idea and repeatedly introduced it to the U.S. to control aphids. The introduced ladybeetles never made it in the wild until a population was found thriving near New Orleans in 1988. After that they spread like wildfire across the eastern U.S. and into Canada.

Thirteen years later they became established in South America and Europe(*). By 2004 they were in southern Africa. They hadn’t been introduced. How did they get there?

A 2010 study of their genetic markers revealed that those three continents were invaded by the eastern North America population. In a move called the bridgehead effect, Asian ladybeetles in the U.S. used our continent as a jumping off point to colonize Europe, South America and Africa.

The bridgehead effect: Worldwide invasion of Asian lady beetles (map from PLOS One and NIH.gov)

The bridgehead effect is now recognized as a method of worldwide pest invasion. The pest establishes a bridgehead — a strong position near a human transportation hub — then fans out from there. Ants, obscure mealybugs and brown marmorated stinkbugs have spread this way.

Who will be the next pest to establish a bridgehead? I hope it won’t be the spotted lanternfly.

Read more at: Bridgehead Effect in the Worldwide Invasion of the Biocontrol Harlequin Ladybird.

(photo from Wikimedia Commons; map from PLOS One article posted at nih.gov. Click on the caption to see the original)

p.s. (*) The European population of H. axyridis is mixed. Some were directly introduced from their native range but were not considered pests until the North America cohort arrived.

Which Personality Survives Bad Storms?

Comb-footed spider in the Everglades (photo from Wikimedia Commons)

Comb-footed spiders (Anelosimus studiosus) have a lot of personality. These social cobweb spiders live in colonies of 40-100 individuals, build their webs around branches, and hunt cooperatively to capture large prey.

The spiders exhibit either aggressive or docile personalities. If you know what to look for you can tell the difference. In the evening aggressive A.studiosus attack each other and then retire to opposite corners of the web; docile spiders rest side by side. Aggressive spiders come out to attack when their web is disturbed, the docile ones stay inside.

What happens to these spiders when they’re hit by a tropical storm or hurricane? Is there a difference in which spiders survive?

A 2018 study led by Jonathan Pruitt of U.C. Santa Barbara tracked 240 Anelosimus studiosus colonies in seven states including Florida, Alabama and the Carolinas. For baseline data they recorded the locations and personalities of the spider colonies. Later they searched for spider webs after a tropical storm or hurricane had passed.

You might think it’s futile to look for cobwebs after hurricanes, but individual spiders do survive, stay on their home territory, and rebuild. While humans are picking up the pieces, the spiders are too.

Damage from Hurricane Michael, 2018 (photo from Wikimedia Commons)

The study found that the storms always wiped out the docile spiders but the aggressive ones survived.

The relentless pressure of weather and nature is changing the spider population. Among comb-footed spiders, only the strong personalities survive.

For more information see Science Magazine: “Tropical storms are making these spiders more aggressive” and “For spiders, it’s cruel to be kind

(photos from Wikimedia Commons; click on the captions to see the originals)

Invasive Northern Snakehead at Duck Hollow

Northern snakehead caught by Lance Mroz, Jr in Monongahela River, 26 Sep 2019 (photo courtesy of Lance E. Mroz, Jr.)

Lance Mroz knew this fish was trouble as soon as he pulled it from the river. Anglers had been warned for years to watch out for this invasive alien species but it had never been seen in western Pennsylvania waters — not until Lance caught it in the Monongahela River at Duck Hollow on 26 September 2019.

Northern snakeheads (Channa argus) are predatory fish native to China, Russia and the Koreas. They prefer shallow stagnant freshwater and can survive in low oxygen locations because they can breathe the air. In fact they can live out of water for days where it’s moist and cool and are known to wriggle overland from pond to pond, earning them the nickname “walking fish.”

This top-level predator eats crustaceans, amphibians and other fish and can double its population in only 15 months. If you find one, watch out! They look like this.

All Snakeheads are distinguished by their torpedo shaped body, long dorsal and anal fins without spines, and toothed jaws. Northern Snakeheads are typically distinguished by a flattened, pointy head with long lower jaws.

They have teeth …

… and they can get really big! According to Wikipedia, a record 19.9 pound northern snakehead was caught — actually shot at night with a bow and arrow — at Mattawoman Creek in Charles County, Maryland in May 2018.

How did they get here? People release them. They’ve been kept in aquariums or raised on fish farms in the past, but it’s illegal to keep a live one now in North America. Not everyone knows this.

The first encounter with northern snakeheads in the U.S. did not go well. A breeding population was found in a pond in Crofton, Maryland in 2002. Officials were so worried about this species that they drained the pond and poisoned three adjacent ponds to kill every fish. A man later admitted to releasing an adult pair in the original pond, but the fish was out of the bag. It already had spread in the watershed.

Since then northern snakeheads have been found in Virginia, Florida, New York, Pennsylvania, Massachusetts, California, North Carolina, Arkansas, and B.C, Canada. New isolated discoveries always begin with someone releasing a fish. If the fish become established they spread throughout the watershed. When deemed appropriate, wildlife officials may poison newly infested ponds and kill all fish.

Fortunately Lance Mroz knew what to do. He identified the fish, killed it, froze it and reported it to the PA Fish and Boat Commission. If you ever catch one,

The PA Fish and Boat Commission confirmed today, 30 September, that it’s indeed a northern snakehead.

Thanks to Lance Mroz for posting his catch in the Duck Hollow Facebook group. Now we know what to look for and what to do when we find it.

(fish photo courtesy of Lance E. Mroz, Jr., teeth photo from USFW factsheet)

Additional resources:

Shake Those Flowers!

Halictid bee shakes a flower (photo from Wikimedia Commons)

Why are bumblebees hired to pollinate greenhouse tomatoes? Why do some bees buzz when perched on a flower?

In some plant species, bees must vibrate the flowers to shake pollen loose. The technique is called buzz pollination or sonication.

Buzz-pollinated plants have anthers with very small openings so the pollen stays inside unless the anther is shaken. To collect the pollen bees grab the flower and vibrate their flight muscles. This makes a buzzing sound.

In the photo above, a halictid bee is releasing yellow grains of pollen as she shakes. She collects it on her legs for delivery to the hive.

Most species in the Solanum genus, including potatoes, eggplants and tomatoes, have to vibrate to release their pollen. Strong wind can do the trick outdoors but greenhouse tomatoes are out of luck. That’s how bumblebees get an indoor job.

(photo from Wikimedia Commons; click on the caption to see the original)