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Searching for Colorado’s little-known fireflies

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Searching for Colorado’s little-known fireflies


Banner image: Fireflies dance over a field near Sawhill Ponds in Boulder, Colorado. (Credit: Peleg Lab)

Owen Martin steps carefully through the knee-high grass growing up around a long-abandoned railroad track near Sawhill Ponds in Boulder, Colorado. It’s almost pitch black out. The sun set 45 minutes ago, and the only light now comes from the distant buzz of cars on Valmont Road.

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Or almost the only light. If you let your eyes adjust to the dark, you can just make out the twinkle from hundreds of faint specks. They flash on and off as if someone spilled yellow-green glitter across this empty field. 

Martin, a doctoral student in computer science at CU Boulder, is hunting for fireflies.

“There’s one right there,” he says, holding up a butterfly net. “It’s leading me on a little chase.”

Many people who call Colorado home might be surprised to learn that fireflies (or lightning bugs, depending on who you ask) also live in the state. But, if you’re lucky, you might stumble on a few pockets of these insects lighting up the night. You just need to know when and where to look.

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That’s what Martin and his advisor Orit Peleg are trying to figure out now. In a project that blends technology with natural history, researchers in Peleg’s lab have spent summers since 2018 traveling across the state in search of fireflies. They use 360-degree cameras to learn more about the insects, including the patterns they make with their flashes. In many ways, the team is in a race against time. In Colorado, as in other places around the world, firefly populations may be vanishing as a result of humans paving over wetland habitats and saturating the night sky with artificial light.

“Firefly flashes are like a little, secret language,” said Peleg, associate professor in the BioFrontiers Institute and Department of Computer Science. “They are very special, and we have a lot to learn from them.”

 

Introducing Colorado fireflies

It’s a new experience for Martin. The researcher grew up not far from this natural area in Louisville, Colorado, but had never seen a firefly at home until three years ago. He said that observing these animals in the wild is a “wonderous feeling.”

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“It’s all dark, and you feel like the rest of the world isn’t there anymore,” he said. “You feel like you are floating in space, and there are all these stars moving around you.”

A male Photuris firefly coated in pollen sits on a thistle plant near the Boulder Reservoir. (Credit: Owen Martin)

A red light illuminates a man wearing a cap in the dark

Owen Martin uses a red light to examine a firefly in the field. (Credit: Owen Martin)

At Sawhill Ponds, he’s trapped one of those stars now. He gingerly moves the insect from his canvas net to a covered petri dish. The firefly is about a half-inch long, and you can just make out its orangish head and black wings. A light organ on the bug’s abdomen glows, flashing like the beacon from a lighthouse. 

Fireflies belong to a family of beetles known as Lampyridae, and roughly 2,000 species of fireflies can be found across the globe. It’s not clear how many live in Colorado. The insects near Sawhill Ponds belong to a common genus called Photuris. The name roughly translates to “light terror” because female Photuris fireflies sometimes use flashes to lure in, then devour males from different species. 

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Entomology collections at the CU Museum of Natural History include specimens from Photuris and four other genera found in 19 Colorado counties—ranging from Yuma County in the northeast to Montezuma in the southwest. Martin himself has observed fireflies in the town of Divide, which sits near Pikes Peak at an altitude of more than 9,000 feet.

Still, there are good reasons why these luminous animals remain such a mystery in the state. Unlike fireflies in the eastern U.S., which can abound all summer long, Colorado fireflies tend to cluster in swampy areas and are active for just a few weeks per year—appearing in the second half of June, then disappearing again by mid-July. Martin’s research is supported through the President’s Teaching Scholars Program and Timmerhaus Fund Ambassadors at the University of Colorado and by the City of Boulder Open Space and Mountain Parks.

“A lot of people here come from places like the Midwest where they’ve seen fireflies. But they don’t know about them in their own backyards,” said Martin, who wants to raise “firefly literacy” in the Front Range.

Speaking firefly

Part of that goal hinges on understanding their secret language, Peleg said.

She explained that male fireflies flash to attract females, which often remain hidden on the ground. Each firefly species, however, has its own, unique flash pattern. 

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“It’s like Morse code,” she said. “It’s this simple light on, light off signal, and that’s probably as close as it gets to computer language, ones and zeros, in the animal kingdom.”

To explore those patterns, her team uses 360-degree GoPro cameras to record fireflies in the wild. They then feed those recordings into computer programs that analyze the patterns. In recent research, for example, the group dug into the flashing behavior of fireflies in the Great Smoky Mountains of Tennessee—where thousands of insects synchronize their displays so that they all flash in unison, bathing entire hillsides in light.

Peleg’s team found that these animals seem to achieve that feat by observing how their neighbors are flashing, then adjusting their behavior to match.

Martin is gathering similar insights into Colorado’s fireflies. Eventually, he and Peleg want to build a library of firefly flash patterns—a sort of Google Translate for insects. That way, people could record video of fireflies flashing, then automatically identify what species they’re looking at.

Protecting diversity

The researchers hope they can collect their data before it’s too late.

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 How you can help fireflies

Coloradans can help protect fireflies by following these tips from the Butterfly Pavillion:

  • Support land conservation and habitat restoration.
  • Stay on designated paths when visiting natural areas to avoid damaging their habitat.
  • Enjoy fireflies in the wild and don’t catch them.
  • Turn off unnecessary lights near their habitats in June through August.

Across the globe, research on fireflies remains scarce. But a growing number of hints suggests that some species may be disappearing. 

In Colorado, artificial light is a major threat. Studies of fireflies from the eastern United States show that streetlights and other nighttime illumination can wash out the signals that fireflies are trying to communicate. It’s a bit like trying to carry on a conversation in the middle of a crowded bar. (Such “light pollution” can also make it more difficult to see the stars from Colorado). 

But there are a number of actions people can take to protect vulnerable firefly habitats. Martin and Peleg invite curious Coloradans to volunteer to help out with the research project. A team at the Butterfly Pavillion near Denver is also raising adult fireflies from larvae, which could one day be released into the wild. 

The potential of those actions is on display at Sawhill Ponds. There, a strange light has caught Martin’s attention. It’s a firefly, but one with an oddly orange-colored light.

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After a few swipes of his net, the scientist captures the mysterious insect. It’s noticeably smaller than the Photuris bug he caught earlier. It’s a Pyractomena, a completely different firefly genus and one Martin has not recorded at this spot before.

“This could be very exciting,” he says.

The new insect is a reminder that scientists still have a lot to learn about fireflies in Colorado. Martin encourages everyone to get out and look.

“Turn your lights off,” he said. “Then, between the middle of June and the middle of July, try to take some walks at night in your local wetland areas and see if you can find some.”



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US Fish and Wildlife backed Colorado plan to get wolves from Canada before new threats to take over program, documents show

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US Fish and Wildlife backed Colorado plan to get wolves from Canada before new threats to take over program, documents show


The U.S. Fish and Wildlife Service backed Colorado’s plan to obtain wolves from Canada nearly two years before the federal agency lambasted the move as a violation of its rules, newly obtained documents show.  

In a letter dated Feb. 14, 2024, the federal agency told Colorado state wildlife officials they were in the clear to proceed with a plan to source wolves from British Columbia without further permission.

“Because Canadian gray wolves aren’t listed under the Endangered Species Act,” no ESA authorization or federal authorization was needed for the state to capture or import them in the Canadian province, according to the letter sent to Eric Odell, CPW’s wolf conservation program manager. 

The letter, obtained by The Colorado Sun from state Parks and Wildlife through an open records request, appears to be part of the permissions the state received before sourcing 15 wolves. The agency also received sign-offs from the British Columbia Ministry of Land, Water and Resource Stewardship and the Convention on International Trade in Endangered Species of Wild Flora and Fauna.  

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In mid-December, however, the Fish and Wildlife Service pivoted sharply from that position, criticizing the plan and threatening to take control over Colorado’s reintroduction. 

In a letter dated Dec. 18, Fish and Wildlife Service Director Brian Nesvik put CPW on alert when he told acting CPW Director Laura Clellan that the agency violated requirements in a federal rule that dictates how CPW manages its reintroduction. 

Colorado voters in 2020 directed CPW to reestablish gray wolves west of the Continental Divide, a process that has included bringing wolves from Oregon in 2023 and British Columbia in 2025.

A gray wolf is carried from a helicopter to the site where it will be checked by CPW staff in January 2025. (Colorado Parks and Wildlife photo)

The federal rule Nesvik claims CPW violated is the 10(j). It gives Colorado management flexibility over wolves by classifying them as a nonessential experimental population within the state of Colorado. Nesvik said CPW violated the 10(j) by capturing wolves from Canada instead of the northern Rocky Mountain states of Montana, Wyoming, Idaho, Washington, eastern Oregon and north-central Utah “with no warning or notice to its own citizens.” 

CPW publicly announced sourcing from British Columbia on Sept. 13, 2024, however, and held a meeting with county commissioners in Rio Blanco, Garfield, Pitkin and Eagle counties ahead of the planned releases last January. The agency also issued press releases when the operations began and at the conclusion of operations, and they held a press conference less than 48 hours later.

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Nesvik’s December letter doubled down on one he sent CPW on Oct. 10, after Greg Lopez, a former Colorado congressman and 2026 gubernatorial candidate, contacted him claiming the agency violated the Endangered Species Act when it imported wolves from Canada, because they lacked permits proving the federal government authorized the imports. 

That letter told CPW to “cease and desist” going back to British Columbia for a second round of wolves, after the agency had obtained the necessary permits to complete the operation. Nesvik’s reasoning was that CPW had no authority to capture wolves from British Columbia because they aren’t part of the northern Rocky Mountain region population.  

But as regulations within the 10(j) show, the northern Rocky Mountain population of wolves “is part of a larger metapopulation of wolves that encompasses all of Western Canada.” 

And “given the demonstrated resilience and recovery trajectory of the NRM population and limited number of animals that will be captured for translocations,” the agencies that developed the rule – Fish and Wildlife with Colorado Parks and Wildlife – expected “negative impacts to the donor population to be negligible.” 

So despite what Nesvik and Lopez claim, “neither identified any specific provision of any law – federal, state or otherwise – that CPW or anyone else supposedly violated by capturing and releasing wolves from British Columbia,” said Tom Delehanty, senior attorney for Earthjustice. “They’ve pointed only to the 10(j) rule, which is purely about post-release wolf management, and  applies only in Colorado.” 

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More experts weigh in 

In addition to the 2024 letter from the Fish and Wildlife Service, documents obtained by The Sun include copies of permits given to CPW by the Ministry of British Columbia to export 15 wolves to the United States between Jan. 12 and Jan. 16, 2025. 

These permits track everything from live animals and pets to products made from protected wildlife including ivory. 

The permit system is the backbone of the regulation of trade in specimens of species included in the three Appendices of the Convention on International Trade in Endangered Species, also called CITES. A CITES permit is the confirmation by an issuing authority that the conditions for authorizing the trade are fulfilled, meaning the trade is legal, sustainable and traceable in accordance with articles contained within the Convention. 

An image that looks to be from a security camera shows a wolf looking straight at the camera
Gray wolf sits in a temporary pen awaiting transport to Colorado during capture operations in British Columbia in January 2025. (Colorado Parks and Wildlife)

Gary Mowad, a former U.S. Fish and Wildlife agent and expert on Endangered Species Act policies, said “obtaining a CITES certificate is unrelated to the 10j rule” and that in his estimation, CPW did violate both the terms of the 10(j) and the memorandum of agreement with the Fish and Wildlife Service, because “the 10(j) specifically limited the populations from where wolves could be obtained, and Canada was not authorized.” 

Mike Phillips, a Montana legislator who was instrumental in Yellowstone’s wolf reintroduction that began in 1995, thinks “the posturing about a takeover seems like just casually considered bravado from Interior officials.” 

And Delahanty says “Nesvik and Lopez are making up legal requirements that don’t exist for political leverage in an effort that serves no one. It’s unclear what FWS hopes to accomplish with its threatening letter,” but if they rescind the memorandum of agreement, “it would cast numerous elements of Colorado’s wolf management program into uncertainty.” 

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Looking forward 

If Fish and Wildlife does as Nesvik’s letter threatens and revokes all of CPW’s authority over grey wolves in its jurisdiction, “the service would assume all gray wolf management activities, including relocation and lethal removal, as determined necessary,” it says. 

But Phillips says “if Fish and Wildlife succeeds in the agency’s longstanding goal of delisting gray wolves nationwide,” a proposition that is currently moving through Congress, with U.S. Rep. Lauren Boebert’s Pet and Livestock Protection Act bill, the agency couldn’t take over Colorado’s wolf program. That’s because “wolf conservation falls back to Colorado with (its voter-approved) restoration mandate.” And “the species is listed as endangered/nongame under state law,” he adds. 

If the feds did take over, Phillips said in an email “USFWS does not have staff for any meaningful boots-on-the-ground work.” Under Fish and Wildlife Service control, future translocations would probably be “a firm nonstarter,” he added, “but that seems to be the case now.” 

A big threat should Fish and Wildlife take over is that lethal removal of wolves “in the presence of real or imagined conflicts might be more quickly applied,” Phillips said. 

A gray wolf with black markings crosses a snowy area into a patch of shrubs.
A gray wolf dashes into leafless shrubs. It is one of 20 wolves released in January 2025, 15 of which were translocated from British Columbia (Colorado Parks and Wildlife photo)

But it would all be tied up in legal constraints, given that gray wolves are still considered an endangered species in Colorado, and requirements of the 10(j) and state law say CPW must advance their recovery. 

So for now, it’s wait and see if CPW can answer Fish and Wildlife’s demand that accompanies Nesvik’s latest letter. 

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Nesvik told the agency they must report “all gray wolf conservation and management activities that occurred from Dec. 12, 2023, until present,” as well as provide a narrative summary and all associated documents describing both the January 2025 British Columbia release and other releases by Jan. 18., or 30 days after the date on his letter. If they don’t, he said, Fish and Wildlife “will pursue all legal remedies,” including “the immediate revocation of all CPW authority over gray wolves in its jurisdiction.” 

Shelby Wieman, a spokesperson for Gov. Jared Polis’ office, said Colorado disagrees with the premise of Nesvik’s letter and remains “fully committed to fulfilling the will of Colorado voters and successfully reintroducing the gray wolf population in Colorado.” 

And CPW maintains it “has coordinated with USFWS throughout the gray wolf reintroduction effort and has complied with all applicable federal and state laws. This includes translocations in January of 2025 which were planned and performed in consultation with USFWS.”



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Avalanche To Play Mammoth in 2027 Discover Winter Classic in Salt Lake City | Colorado Avalanche

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Avalanche To Play Mammoth in 2027 Discover Winter Classic in Salt Lake City | Colorado Avalanche


NEW YORK – The National Hockey League announced today that the Colorado Avalanche will be the visiting team in the 2027 Discover Winter Classic and play the Utah Mammoth at the University of Utah’s Rice-Eccles Stadium in Salt Lake City. Additional details for the game, including ticketing information, date and start time, will be announced at a later date.

The 2027 Winter Classic marks the first time the Avalanche will play in the event and will be the fourth ever outdoor game the franchise plays in and the first one they’ll compete as the visiting team. Colorado hosted the Detroit Red Wings at Coors Field in the Stadium Series on Feb. 27, 2016, the Los Angeles Kings for the 2020 Stadium Series at Air Force Academy’s Falcon Stadium on Feb. 15, and the Vegas Golden Knights at Edgewood Tahoe Resort for the NHL Outdoors at Lake Tahoe event on Feb. 20, 2021.

“We’re excited and honored that the League selected us for the Winter Classic,” said Avalanche President of Hockey Operations Joe Sakic. “The Avalanche organization is always proud to be in consideration for marquee events like this. We’re looking forward to being matched up with a great team and represent the Rocky Mountain region in a game that appeals to these two markets in this part of the country.”

The Avalanche are 1-2-0 all-time in outdoor games but captured the most recent one at Lake Tahoe by a 3-2 score.

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Colorado has faced the Mammoth six times since their inception ahead of the 2024-25 campaign, and the Avalanche have posted a 4-1-1 record. The club also owns a 2-0-1 record against Utah this season, which includes beating them in the home opener when Nathan MacKinnon became the first player in NHL history to record a game-winning goal against 32 franchises.



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Colorado Parks and Wildlife building ‘bison roster’ for new potential hunting

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Colorado Parks and Wildlife building ‘bison roster’ for new potential hunting


Colorado Parks and Wildlife is building a list of prospective bison hunters ー a first for the agency as the iconic animal comes under new state management.  Starting this year after the passage of Senate Bill 25-053, bison will be managed as big game wildlife in addition to their historic classification as livestock in the […]



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