Today in Pittsburgh we’re looking forward to a week of heavy downpours.
HAZARDOUS WEATHER OUTLOOK, Pittsburgh, PA, 30 July 2024 Scattered showers and thunderstorms could produce heavy rainfall that creates localized flooding concerns, favoring low lying or urbanized areas.
This is bad news for trees that are on the southern edge of their range. Not only do they live a long time but they cannot adapt as fast as our climate is changing. For example, quaking aspens, which prefer cooler weather, will disappear from Pittsburgh by the end of this century. Meanwhile eastern cottonwoods will do just fine.
Beaver Meadows Recreation Area, 24 June 2024 (photo by Kate St. John)
29 June 2024
Early this week a group of us drove north to go birding at Heart’s Content, Beaver Meadows and Piney Tract in Warren, Forest and Clarion counties. For two days the weather was pleasantly cool and the sky was gorgeous. Here are a few things we saw this week.
Beaver Meadows Recreation Area near Marienville, PA
Allegheny River as seen from Rt 62 south of East Hickory
Old growth hemlocks at Heart’s Content
A fallen tree completely covered by moss. It was cut because it blocked the path when it fell long ago.
Looking through the trees at Heart’s Content
A view of Piney Tract, SGL 330
The Wall of Rocks at the Microtel parking lot in Clarion
Allegheny River south of East Hickory, PA, 24 June 2024 (photo by Kate St. John)Old growth hemlock at Heart’s Content, 24 June 2024 (photo by Kate St. John)Fallen tree coated in moss, Heart’s Content, 24 June 2024 (photo by Kate St. John)Heart’s Content forest, 24 June 2024 (photo by Kate St. John)
Piney Tract, SGL 300, 25 June 2024 (photo by Kate St. John)
The Wall of Rocks:
We stayed at the Microtel in Clarion (nice and new) where I was fascinated by the Wall of Rocks that formed one side of the parking lot. It looked impressive at dusk, lit by streetlamps.
Wall of Rocks closeup at Microtel parking lot, Clarion, 24 June 2024 (photo by Kate St. John)
The next morning it was not so fascinating. It looks this way because the excavated hillside is too steep to mow. It is landscaped with large stones.
Rocky hillside at Microtel parking lot, Clarion, 25 June 2024 (photo by Kate St. John)
Blackpoll warbler, Presque Isle, 12 May 2024 (photo by Charity Kheshgi)
18 May 2024
Best birds this week were seen at Presque Isle State Park on Sunday 12 May while birding with Charity and Kaleem Kheshgi. At Leo’s Landing many of the birds were at eye level including this blackpoll warbler and the barn and bank swallows.
Barn and bank swallows, Presque Isle, 12 May 2024 (photo by Charity Kheshgi)
Even the treetop birds, like this yellow-throated vireo, cooperated for photographs.
Yellow-throated vireo, Presque Isle, 12 May 2024 (photo by Charity Kheshgi)
Was this redstart was looking askance at us? Or eyeing a bug?
American redstart, Presque Isle, 12 May 2024 (photo by Charity Kheshgi)
I had high hopes for the Bird Banding at Hays Woods on Wednesday 15 May but we were in for a surprise. No birds to band! Bummer. đ This restart, banded earlier in the week, shows what we could have seen.
American redstart at Bird Lab banding (photo by Kate St. John)
After we left the banding station we had good looks at a scarlet tanager and found this Kentucky flat millipede (Apheloria virginiensis). It’s colored black and orange because it’s toxic.
It secretes cyanide compounds as a defense. Don’t touch it!
You might find one perched and dying on top of a twig. That’s because it can host the parasitic fungus Arthrophaga myriapodina which causes infected individuals to climb to an elevated spot before death (per Wikipedia). Eeeew.
Centipede Aphelosia virginiensis, Hays Woods, 15 May 2024 (photo by Kate St. John)
This week there were flowers in the tulip trees (Liriodendron) obscured by thick leaves. This flower came into view when a squirrel bit off the twig and didn’t retrieve the branch.
Tulip tree flower and leaves, 16 May 2024 (photo by Kate St. John)
Instead of rain on Wednesday we had a beautiful sunrise.
Sunrise 14 May 2024 (photo by Kate St. John)
To make up for no rain on Wednesday it’s pouring right now on Saturday.
Eastern cottonwoods (Populus deltoides) rely on the wind for both pollination and seed dispersal. In the spring the male and female trees each produce an inflorescence.
The males produce catkins which drop off the tree when the pollen is gone. The females produce flowers whose seeds are embedded in fluff to carry them away on the wind.
Eastern cottonwood inflorescences: male and female (photos from Wikimedia Commons)
By the time the cottonwoods have gone to seed warbling vireos (Vireo gilvus) have returned to the trees on the shore of Lake Erie. Though the birds look nondescript their song is the sound that fills the air in the parking lot at Magee Marsh in May.
Yesterday at Presque Isle State Park we watched a warbling vireo building a nest in a cottonwood. The nest is a cup that hangs from the fork of two small branches. Both sexes help build it.
In s. Ontario [the region of Lake Erie], nest exteriors fashioned with insect and spider silk and cocoons, paper and string, and bits of birch bark; exterior walls composed of grasses, plant fibers, bark strips, plant down, hair, leaves, fine twigs, lichens, and rootlets. Linings were fine grasses, pine needles, plant fibers, rootlets, feathers, and leaves.
p.s. Here’s a mnemonic to help you remember their song:
The mnemonic of âIf I see you, I will seize you, and Iâll squeeze you till you squirt!â is very useful in identifying and remembering this birdâs song.
While easily heard, the Warbling Vireo can be difficult to spot. They tend to perch themselves high in treetops. When they are seen, this common bird is often described as ânondescriptâ.
Oak tree in bloom with dangling pollen flowers (photo by Kate St. John)
1 May 2024
Since our last spring checkup six weeks ago, Pittsburgh has galloped into summer. Last weekend we had July-in-April weather with official highs of 83°F and even higher in town.
Pitt peregrine Carla felt the heat at 10am on 29 April as she shaded her chicks and gular fluttered (panted) to cool herself off.
Pittsburgh is not alone. In a wide swath of the U.S. from Iowa to New York spring was 20+ days early this year. In Pittsburgh nearly half of April was more than 10°F above normal while we had only one cold day at 12°F below normal.
So what temperature should we expect if we’re only 20 days ahead of schedule? April 29th ought to have been like a normal 19 May but it was way beyond that.
The heat prompted the trees to leaf out early and flowers to bloom ahead of schedule. Maples and buckeyes are in full leaf now and our oaks are at flower+leaf stage as shown at top. The leaves are hosting food for birds in the form of tiny caterpillars, so …
Migratory birds are taking advantage of the south winds and early leaf out. Since 27 April we’ve seen our first scarlet tanagers, rose-breasted grosbeaks, Baltimore orioles, indigo buntings and warblers.
Charity Kheshgi has been documenting our good luck with warblers at Frick Park. Notice the size of the leaves in her photos!
p.s. And where am I? Right now I’m at Magee Marsh a week ahead of The Biggest Week in American Birding. I don’t expect to see the swarms of migratory birds that will be here next week (I’m leaving on 3 May) but I’ll learn what happens before the people show up and why everyone waits until next week. đ
Blue-winged teal, Moraine State Park, 27 March 2024 (photo by Charity Kheshgi)
30 March 2024
A Wednesday trip to Moraine State Park was cold and gray but quite worthwhile. We saw 300(!) red-breasted mergansers, many ring-necked ducks, blue-winged teal and a rare bird — a trumpeter swan. Charity Kheshgi’s photos show off the teal and swan.
Trumpeter swan, Moraine State Park, 27 March 2024 (photo by Charity Kheshgi)
Trumpeter swans (Cygnus buccinator) are “the heaviest living bird native to North America and the largest extant species of waterfowl.” They were nearly extinct in 1933 — only 70 remained in the wild — but several thousand were then found in Alaska. “Careful re-introductions by wildlife agencies and the Trumpeter Swan Society gradually restored the North American wild population to over 46,000 birds by 2010.” The trumpeter at Moraine is one of their descendants. (quotes from Wikipedia)
Comparing two springs, yellow buckeyes’ early leaf-out, Schenley, March 2012 and 2024 (photos by Kate St. John)
Early spring is the hungriest time of year for deer in Pennsylvania because they’ve already eaten all the easy-to-reach food. When the deer population is greater than the area’s carrying capacity they seek out food in unusual places. Thus I was amazed but not surprised to see a deer browsing the bushes next to our highrise at 5:30am. There is nothing to eat down there. There is nothing to eat anywhere near here.
A deer browses at a highrise in Pittsburgh, 5:30am 24 March 2024 (photo by Kate St. John)
Despite the popularity of The Christmas Song, you’ll never find nuts of the American chestnut in the wild. By the time The Christmas Song was written in 1945 mature American chestnuts were nearly gone from North America. Today there are so few surviving mature trees that Wikipedia lists only 25 locations though people are always searching.
American chestnuts (Castanea dentata) used to be more abundant than oaks within their native range.
Then in the late 1800s someone imported Japanese chestnut trees that had chestnut blight. Asian chestnuts are immune, American trees are not. First noticed at the Bronx Zoo in 1904, chestnut blight spread quickly and nothing could stop it. By 1950 mature American chestnut trees were gone throughout their range.
Chestnut blight is caused by a fungus that kills the above-ground portion of the tree by getting under the bark and girdling the trunk.
The stump lives and sends up seedlings though they die as saplings. The process repeats — seedlings, sapling, death. Most stumps are at least a hundred years old.
To find a chestnut in the woods I look for the leaves at knee height. The photo below shows a typical American chestnut stump with seedlings. This one has a dead sapling as well.
For over 70 years arborists have been searching for a cure for chestnut blight and trying to breed immune American chestnuts. They have crossed the American chestnut with Chinese chestnuts, then back-crossed the hybrid to another American chestnut. These efforts, supported by The American Chestnut Foundation among many others, take decades to realize any success.
There are several experimental orchards in Pennsylvania. All are protected from deer.
As potentially successful hybrids become available, they are planted more widely — still in protected areas — to test their immunity and build back the chestnut population.
Perhaps in one to two hundred years the nuts of American chestnuts will be easy to find and we’ll appreciate the first phrase of The Christmas Song again.
You’ve probably noticed that in humid weather table salt clumps in the salt shaker and sticks to the top. That’s because at the molecular level salt’s ions have a net positive charge that attracts atmospheric water which has a net negative charge. Salt literally pulls water out of the air and builds crystals. This process can make the top of the salt shaker moist or dampen a salted road on a humid day.
Can salt’s natural means of pulling water from the air be used to gather water in a larger way? Researchers led by Marieh B. Al- Handawi investigated Athel tamarisk (Tamarix aphylla), a desert plant native to Africa and Asia that takes up saline water with its roots and secretes excess salt through its leaves.
The tiny leaves are arranged alternately, almost wrapping the branches. The salt crystalizes on the leaves. Look closely and you can see tiny crystals.
The smaller crystals stay on the plant and attract more water, especially overnight as shown on this branch in the early morning (8 a.m.) with condensed water droplets.
Every day the water cycle repeats: (A) branches attract water overnight, (B) water evaporates during the hot day while salt crystals grow, (C) water is gone and crystals are large, (D) during overnight high humidity the crystals attract water from the air and the plant absorbs the water. — paraphrased from PNAS: Harvesting of aerial humidity with natural hygroscopic salt excretions.
The tree is “drinking” from its leaves.
Researchers observed that at least one type of salt, lithium sulfate, forms small crystals that remain on the leaves and absorb water from the air. When the team added colored water to salty leaves, they watched the liquid stick to the crystal crust, then absorb into the plantâs leavesâevidence that the salty coating acts as a bona fide water collection mechanism.
Acorns are complicated because oaks are extremely diverse. There are about 500 species in the Quercus genus (oaks) plus about 180 hybrids, all of them native to the Northern Hemisphere and Asia.
The best I can do in the field is divide them into the red oak or white oak group based on buds, bark and leaves. Knowing this, I balk at identifying acorns down to the species level. There is only so much room in my brain and I’m saving it for birds.
So with that in mind here are a few acorns I’ve found in Pittsburgh recently. What exact species are they? The only one I know for sure is the burr oak.
Pin oak acorns found on Devonshire St sidewalk (photo by Kate St. John) — see comments for IDBur oak acorn, Schenley Park, Oct 2022 (photo by Kate St. John)White oak acorn without its cap (photo by Kate St. John)Red oak acorns and a mix of fallen leaves, Sept 2020 (photo by Kate St. John)
Buckeyes have always been one of my favorite objects because their skin is smooth and shiny fresh out of the husk, perfect to carry in my pocket like a worry stone.
In America, the native Aesculus are commonly called âbuckeyes,â a name derived from the resemblance of the shiny seed to the eye of a deer [a buck’s eye]. In the Old World, theyâre called âhorse chestnutsââa name that arose from the belief that the trees were closely related to edible chestnuts (Castanea species), and because the seeds were fed to horses as a medicinal treatment for chest complaints and worm diseases.
Let’s go backwards in the growing season from nut to husk, flower and leaf by examining buckeyes planted in Schenley Park more than 100 years ago.
The large nut pictured at top left is from a European horse chestnut (Aesculus hippocastanum) native to Albania, Bulgaria, mainland Greece and North Macedonia. Each husk contains one to three nuts. Sometimes they’re flat on one side. My favorites are the round ones.
They’re produced from the white flowers that have pink (already fertilized) highlights. Notice that each leaf has seven fat leaflets. The number and shape of the leaflets indicate this is a horsechestnut.
Horse chestnut flowers and leaves (photo by Kate St. John)
In winter horse chestnuts are easy to identify by their large, sticky end buds.
The yellow buckeye (Aesculus flava) is native to the Appalachians and Ohio Valley and is North America’s tallest buckeye tree at 70 feet. Planted as an ornamental in Schenley Park it can hybridize with its shorter cousin, the Ohio buckeye (Aesculus glabra), making identification difficult for non-botanists like me.
Yellow and Ohio buckeye nuts look a lot like horse chestnuts. Seeing the husk is a big help because yellow buckeye husks are smooth …
p.s. The small buckeye nut in the top photo is from the shrub-sized bottlebrush buckeye (Aesculus parviflora), planted in Schenley Park near Panther Hollow Lake. Click here to learn more.
(*) Which Flowers? I could not tell whether the flower photo was yellow or Ohio buckeye. Mary Ann Pike suggests Ohio buckeye in this comment.
