Sunday, January 20, 2019

Marching to the Lakeshore



Jumping Bush Crickets, fall, 2018



They’ve made it to the south shore of Lake Erie and are spreading along the lakeshore. It looks like they’re staging an invasion and trying to determine how to get across.

Handsome Trigs, fall 2018

Round-tipped Coneheads. Jumping Bush Crickets. Handsome Trigs. I’ve been documenting their northward movement for several years now. Will they find a way around Lake Erie to the Canadian shoreline?

Round-tipped Coneheads, fall 2018

I first met Round-tipped Coneheads in the Dayton area, and later discovered that some were already as far north as Geauga County. I then discovered they’re fairly common in Summit County and I began to focus on tracking them in counties farther north. Each year, I’d document more occurrences in NE Ohio parks and preserves including Medina, Lorain, Cuyahoga, Geauga, and Lake Counties. 

I hadn’t searched for them in Portage County southeast of Cleveland except for the Aurora area, but I found them this year at the Portage County Park District’s Breakneck Creek Preserve. 

Along the lakeshore, I’d already recorded them at Lake Erie Bluffs in eastern Lake County, North Kingsville Sand Barrens in the far northeastern tip of Ohio near the Pennsylvania border, and to the west at East Harbor State Park on the central Ohio lake shore’s Marblehead Peninsula. One would think they’d be elsewhere along the lake in addition.

I was invited to give a singing insect program last September at the Westlake Porter Library and decided after the program to see if there was any kind of field or meadow at nearby Huntington Reservation. I was already very close to this Cleveland Metroparks reservation, which is at the lake shore near the Cuyahoga/Lorain County line. It was a mild evening and still early, at least by my standards.

After listening to crickets and noticing Monarch butterflies mating in the dark, I thought I heard a buzzing in spite of the traffic on Lake Road…
 



..and sure enough  - there was yet another lakeshore-dwelling Round-tipped Conehead. 

                                       Round-tipped Conehead, Huntington Reservation


And there’s more. They’re also at Cleveland Metroparks’ Acacia Reservation, which is a former golf course across from Beachwood Mall and adjacent to both Legacy Village (a large retail complex) and the I-271 on-ramp at Cedar Road. 



How did they even GET there?

Then one of my music theory students heard a singing Round-tipped on campus in Cleveland’s University Circle.

Here’s my 2018 map of northbound Round-tipped Coneheads. 


 Canada, they’re coming! They just have to find a route. 

 
It might not be a land route, either. Jumping Bush Crickets have made it to Kelleys Island in Lake Erie. How did they get there? I think they took the ferry – in landscape saplings and shrubs. I’ve heard them singing in the outdoor garden section of a Home Depot parking lot not far from where I live, so why not? 


Humans have transported other insects – including singing insects – much farther. For example, the Roesel’s Katydid and the Drumming Katydid are both non-invasive European immigrants to our region’s species list. 

In addition to a possible ferry ride to the islands, Jumping Bush crickets are continuing to move northeast over land in Ohio. They’re well established in the Cleveland area now, though their presence is still spotty in the snow belt counties in the northeast corner of the state. But each year, they move farther into this snow-laden region and I’ve tracked their progress one highway at a time over the past 10 years. 


Although I’ve found them along I-90 from Cleveland all the way to downtown Erie, PA., there are still areas where their songs are missing from the singing insect chorus. 

They're doing well close to Lake Erie at Mentor Marsh in Lake County, where I recorded them at the Nature Center on 9-23-18. 


 

Although I’ve recorded them at Lake Erie Bluffs in eastern Lake County, I did not hear any in Lakeshore Reservation. None - but there were plenty of Handsome Trigs. It was quite unusual to hear one of these northbound cricket species without the other now, as it’s such a typical pairing these days (or nights, to be more accurate).

Lake Erie Bluffs to the west, and Lakeshore Reservation five miles to the northeast.
The recording was made at Lakeshore Reservation on 9-20-18.


Just south of Lakeshore Reservation near Rte. 20, though, I began to hear their songs again and I suspect they’ll make it to this park quite soon.

Before I continue to the last of these three northbound species, I’d like to tell you more about how range expansion sounds. Keep in mind that most of my survey work is done by ear, since these insects are small, protect themselves by staying hidden, and are often inaccessible.

But I can hear them – and I can hear that there are a lot of individuals singing once they become established in a new area.

For example, in 2017 I was looking for Snowy Tree Crickets in Portage County. This shouldn’t be so difficult. The song is distinctive and it’s not particularly soft. You know this one.



In areas like Portage and Summit Counties, however, the numbers of Jumping Bush Crickets are so large that there are times when I can’t hear any other crickets. The huge chorus drowns out everyone else except perhaps the noisy Common True Katydids. Jumping Bush Cricket choruses resound through the woods as well as residential areas. They also love edge habitats with…not surprisingly…lots of bushes. 

Snowy Tree Crickets like residential areas, shrubs, and vines as well, but they become almost inaudible when large numbers of Jumping Bush Crickets take over the stage with their wall of sound. In more residential areas where I was listening for Snowies from my car, I simply gave up because I couldn’t possibly hear them if they were present.

Jumping Bush Crickets were not an expected sound in the Cleveland area 15 -20 years ago, and it was exciting to hear a few individuals here and there when they first begin to move up here. They’re much more common in our parks now and increasingly common in the suburbs and even in the city. At what point with the wall of sound become the norm up here as well? 



Those beautiful little Handsome Trigs are continuing their northeast movement as well, as evidenced by their strong showing at Lake Shore Reservation. Currently in the Lake County Metroparks close to the lakeshore, their numbers still drop off in Ashtabula County. I’ve found just a few at Geneva State Park on Lake Erie, and last year I drove into the city of Ashtabula itself, listening in parks and neighborhoods. I finally found a small cluster of Handsome Trigs singing in shrubs next to a building in a warehouse area near the river.

I wondered yet again, how DID they get there?


It’s only been recently that Handsome Trigs' sparkling, crackling songs have become an addition to the expected smooth, silvery songs of the Say’s Trigs in the lakeshore counties. Although they’ve been abundant in Summit County, Handsome Trigs are now becoming a prominent and distinctive chorus in Lorain, Cuyahoga, and Lake Counties. Geauga County locations where I initially found just a few in a couple of buckthorns along a power line cut or a blackberry tangle near a trail now have steadily growing populations. The rapid increase in as little as a few years is both surprising and impressive!


And it’s easy to hear the population growth. For such tiny insects, they are surprisingly loud and their songs are quite distinctive. I find theirs to be a more prominent sound than the Say’s Trigs for whom I now have to listen more closely.



These shifting  ranges and changing ensembles aren’t just occurring in NE Ohio. Naturalist and singing insect specialist Carl Strang in the Chicago area has been studying crickets, katydids, and range expansion for many years, carefully documenting annual changes in range and updating maps for multiple species. His work shows very specifically where Round-tipped Coneheads, Jumping Bush Crickets, and Handsome Trigs are moving north in his region and by how much each year. You can read more about his work in his blog, Nature Inquiries. There's a search box on the left side of the page that allows you to search for the species you’re interested in reading about.

I’m already curious enough to consider a listening tour around the north shore of Lake Erie from Toledo across Canada east to Buffalo. I think they’ll need a land route unless they take a ferry. Unlike them, however, I’m going to have to finally get a passport…




If you'd like to read more about the species in this post, I've included links to the species accounts in my online field guide, Listening to Insects: NE Ohio's Crickets and Katydids. 



Monday, November 19, 2018

Songs from a Landfill


 
                                          (Sign at Cleveland Lakefront Nature Preserve)


This was an autumn that changed dramatically from an unsettlingly wonderful extended period of temperatures in the 70s and even 80s to a dramatic 35-degree plunge to the low 40s. Earlier in October, the nighttime low temperatures had been absolutely balmy and the remaining crickets sang as if it were August. Then the abrupt arrival of unseasonably cold temperatures was accompanied by rain and more rain.


Singing insect season didn’t gradually diminish. It was a sharp cutoff.  On those rare occasions when the sun appeared and temperatures climbed briefly into the 50s, a few survivors attempted to resume singing. Their songs, now softer, were delivered from lower locations in thicker vegetation by wary and tentative individuals. Instead of moderating, the cold, wet weather intensified and the last crickets were silenced.


The finality was too difficult to accept, as usual. Were there any crickets singing anywhere? 



What about near the lake – as in right at the lakeshore? The Lake Erie water temperature off Cleveland was 54-55, so the lakeshore areas hadn’t gotten quite as cold. The warmest area in the region should be the lakeshore in the city because of urban heating.



If so, then perhaps Cleveland Lakefront Nature Preserve would be the place to look and listen for survivors. I’d read about the habitat improvements underway at this urban lakeshore preserve – especially the meadow area - and I knw that it's typically filled with migrating birds in spring and fall. Yet I’d only visited a few times because one of my goals is to get away from human noise, not immerse myself in it.


I invite and encourage you to read more about this 88-acre preserve’s origins as a confined disposal facility for polluted material that was dredged from the Cuyahoga River and couldn’t be dumped directly into Lake Erie itself. The site was commonly referred to as “Dike 14” (short for “diked disposal facility site number 14.”) Please see Dike 14: From Sunken Barges to Nature Preserve by Jim Lanese at Cleveland Historical.org, and keep in mind that the vegetation, birds, and insects now present moved in on their own once disposal ended in 1999. 




When I pulled into the parking area on November 5th, I was astonished. Allard’s Ground Crickets – a multitude of them – were singing nonstop in the grass near the cars!  What a gorgeous, sparkling chorus! Elderly grasshoppers hopped laboriously on the path, an ancient Slender Meadow Katydid tried to hide in the taller grasses, but the Allard's Ground crickets sounded as youthful and enthusiastic as if it were late July. The truth of the season was in the calls of the Golden-crowned Kinglets in the evergreens overhead, but the grasses hosted the last songs of summer.


I tried to record the ground cricket chorus, but the adjacent freeway’s urban uproar was prohibitive. The preserve is next to heavily-traveled I-90, (which we call the Shoreway here in Cleveland) and its din obscures all other sounds except the jets flying into Burke Lakefront Airport just west of the preserve.



Although the Allard’s chorus was quite enthusiastic, I knew their concert would abruptly end in just a few days. Within less than 10 minutes, I caught four of them - just a small sample of all the crickets singing in the grass – so they would continue singing in a warm house.

This initial discovery was exciting, but it quickly became essential for me to relocate out toward the lake and away from the relentless traffic. 




I headed to the gate and began walking toward the meadow area. Mowed paths were lined with goldenrod standing tall with silvery seed heads held high. 



Then from the back of the goldenrod I heard…a Four-spotted Tree Cricket! How did his species arrive at this former landfill, and why was he still alive and singing after that prolonged, miserable weather? 


He definitely wouldn’t be alive for more than a couple more days.  I searched until I found him and gently plucked his leafy concert stage into a container so he could continue singing in a warm house. 


I subsequently heard one additional - and very intriguing - Four-spotted song farther up the path. It sounded as if his “voice” cracked and broke between two different pitches. How was this possible? Surely age and damage to the file teeth of his file-and-scraper instrument was the cause, but I had no way of examining him. 


In fact, I couldn’t find him at all. I certainly tried, but I was at the preserve during a break between teaching my morning classes and an important meeting in the afternoon. I couldn’t return to school with my hair adorned with goldenrod seeds and my clothes looking like a seed bank.


But I was able to get a recording of what I heard, and if you look at the sonogram you can see as well as hear the two different pitches.





As I approached the meadow, I was delighted to see tall stands of native grasses. Did Sword-bearing and Round-tipped Coneheads sing here earlier in the season? I decided immediately that I would need to return next year and learn more about which crickets and katydids were somehow finding and establishing themselves in this urban insect oasis. 




My most significant surprise occurred along a rutted path a little farther to the west. This is what I saw, and at first, I just heard traffic. 


 But look closely at the sonogram as you listen...




Do you see that pale orange line far above the thick, fuzzy band of color that is traffic noise? 



As I brought my microphone closer to what had caught my attention, this is who I heard:





Cuban Ground Crickets! 

Since discovering that this supposedly southern species is common in every county in NE Ohio, I’ve been curious about whether they're present in more urban areas. I hadn’t found them in the city or the inner-ring suburbs, but here they were in a former river-dredging landfill! 


They’re only ¼” in size. They jump very well, but they don’t fly. How could they have possibly gotten to this area? 

For that matter, how are any of these singing insects reaching this spot? A few years ago I found a Black-legged Meadow Katydid in a stand of phragmites there, and a single Forbes’s Tree Cricket had announced his presence in the goldenrod. I was puzzled and curious, but did not pursue that particular wondering. Maybe it's time I did.

                Black-legged Meadow Katydid in phragmites at CLNP on 9-14-15

    
You may be wondering how my new house guests are doing.




The Allard’s Ground Crickets’ winter homes are plastic insect carriers with a base layer of sand, clumps of grass, and some small twigs and leaves. They like sandy soil, after all, and they appreciate having places to hide.  

 
They are a lively bunch when they’re warm, and they’re quite capable of hopping right out of their plastic carriers and onto the dining room table when I change their lettuce, grape and apple slices each evening.  



If I’m not fast enough, they can quickly travel across the dining room floor or perch on one of the chairs. Fortunately, I've caught any adventurous ones before they got too far.


The Cuban Ground Cricket seems quite pleased with his carrier as well. 


Everyone comes upstairs to the bedroom at night to enjoy the warmth of the space heater, returning to the dining room table near the south windows during the day and my little studio in the evening. When they're warm, they sing: light, separated, sparkling songs from the Allard's Ground Crickets and longer, smooth, silvery songs from the Cuban Ground Cricket.



 
Dmitri the cat spends hours with them, as he does with our late-season crickets every year. Even when I can't spot them in their little apartments, he always knows exactly where they are.




And the Four-spotted Tree Cricket? He enjoys eating the apple pieces I provide in his leafy terrarium. I try to choose a variety of stems and leaves that seem like appropriate singing perches, and I move him up to the bedroom by the space heater at night.



He is quite old, but when all the house lights are off and conditions suit him, he still sings. It’s the song of an elderly individual, but I am so appreciative. And when I woke up on the morning of my mid-November birthday, I stayed in bed an extra ten minutes just to listen to his solo. He continued to sing while I quietly slipped downstairs for my recording equipment so I could share his song with you.