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What's up, Deuterinos? It's Emily Kwong. And Burley McCoy, freshly back from parental leave and Emily, today I hear you recently embarked on some late night reporting in the woods under the cover of darkness. Yeah. So is this your way of telling us you're a spy? What a spy revealed that. Okay, my thoughts exactly, but seriously, what were you doing out there? Well, Burley, I was on a night hike. So in about two minutes, we'll get started.
Meanwhile, enjoy yourselves. It was a Trump through Patuxent River State Park in Maryland, hosted by a group of naturalists, people trained in gathering observations and educating people about the environment. Now, naturalists lead hikes all over the world, but not all of them, like this screw handout homemade banana bread. That was pretty cool. And UV lights provided by our leader.
Hi, my name is Sereneela Linares. I'm the Facility Director at Non-Grenure Nature Center and the program's share of the Micrological Association of Washington, D.C. Okay, so Sereneela is a mushroom expert along with other fungi. She's been leading nature walks since 2013 and tonight. I really wanted to see the forest through her eyes.
to know what flaps and flutters and fluoresces when the sun goes down in winter. It is a night for nature magic, bioluminescence, fluorescence of fungi and lichens, of insects that fly in the night and are attracted to the bait that we have set up. So I should really like try to listen very closely to everything. We will have
And that's what I want to do with you. Today, Burleigh, I want to just get real quiet and listen to the sounds of a winner's night when everything is dead or dormant. Or is it? Okay. Today on the show, we are taking you on a night hike through the Patuxent River watershed in search of owls and salamanders and maybe, if we're lucky, a bioluminescent mushroom. You're listening to Shortwave, the science podcast from NPR.
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Alright Emily, so you went on this night hike last month, set the scene for us. What does this park look like?
No idea, because it was so dark. And we don't have half of these critters night vision. OK, this makes sense. But I know that the park, because I looked at a map, sits along the Patuxent River, which flows into Maryland's Chesapeake Bay. We were bundled in our winter coats, and the first stop along our night hike was a patch of lichen growing along a tree just off the parking lot. Remind me what? Our lichen, exactly.
Yeah, lichen is that stuff that grows on trees. It kind of looks like seaweed, but it's actually a hybrid colony of fungi and algae in a symbiotic relationship. To show us, sarinella dramatically shines our flashlight up the tree trunk. Nothing out of the ordinary, right? That blue gray lichen color, everything looks pretty much the same.
Sarah Nella then flips on her UV light and the patch of green lichen totally changes. And it's suddenly glowed, neon yellow. The lichen, one particular part of it was fluorescing. So absorbing the ultraviolet light from the flashlight and emitting visible light.
Oh, and I'm just looking at the pictures you just sent me. And this is like neon, neon yellow. Yeah, it was like the Las Vegas strip. Natalie Howe, an ecologist with the US Department of Agriculture, steps forward and shoves her face into the tree bark. You can come up real close. You can sort of tell that there's a lot of diversity there because there's some that are a little yellow or some that are a little gray.
Sounds so excited. So we take a UV light and get up close to that tree to look. And pretty soon, Sarah Nella shouts. Oh, Natalie. What did you find? Oh, that's true. We barely ever seen that orange one. They just sound so excited. This sounds like my kind of group. OK, so like what do the different colors mean? Yeah, OK, so the yellow lichen is called
pixine sub-seneria, and the orange lichen is pixine serritiata, and both have chemicals in their tissues which allow them to fluoresce. Okay, but like, why? Natalie explained to me that lichen fluoresce has a protective response against ultraviolet light damage from the sun. Oh my gosh, I wish we could do this. Okay, that's so cool. So like, these lichens are carrying their own sunscreen.
So the group starts to branch out at this point, away from the lichen depot, drifting into pockets of the forest, swinging their UV lights and headlamps up trees. Everyone's kind of getting into it now. And they're breaking up books to try to identify what they see. And suddenly it just feels weird to step on anything, because like everything is alive. Yeah, except where there's trash. Oh. Oh, what's I actually got too excited about finding like a soggy piece of toilet paper as a reflected weirdly.
Oh my gosh. Okay, so what did you see next on your hike? Well, there was this gigantic piece of fabric that one of the naturalists had hung up and lit with mercury vapor lamps. So those are lamps that emit this very broad spectrum of light and attracted all these different kinds of moths, just like clinging to the fabric. Come on over here. If anyone wants to get a quick photo of the fall cankerworm. I want to see a photo of the fall cankerworm.
Yeah, this moth, along with all moths, use the moon and stars to navigate so lamps are a good way to draw them out of the shadows. Then, Matt Felparin, a roving naturalist with Nova Parks, the regional park system of Northern Virginia, makes an announcement that he will be, quote, doing owl calls intermittently, okay? They're very defensive of their territory, so they will frequently come and check out who the potential rival is in their territory. So what's the best way to call Bard Owl?
there's a mnemonic for it and the mnemonic would be who cooks for you who cooks for you all
Matt learned how to do this while prowling for owls during the Great American camp out. What is that? It's this nationwide campaign that happens every June to get people outdoors in a safe way. And this was a really common theme among the naturalists. They're all involved with some kind of community work.
Anna Kahanui is the co-founder of the DC-based non-profit Capital Nature. I found her crouched over a log inches from the dirt taking a picture with her iPhone. Oh my gosh. What is that? It's a snow fungus, so it's a jelly fungus. I just want to get a picture of it. It's like that fungi that are jelly. Yeah, let me show you a better picture of it. It looks like slime.
So you got Matt making alcohol in the background, Anna, face in the dirt showing me her eye naturalist. Okay, so eye naturalist is the app that helps you ID things in the natural world. I use it all the time for things like flowers and trees and one time a spider in my garden. Yeah, Anna's like a prolific user of eye naturalist. Well, you have 5,107 observations. I do make a lot of observations.
5,100. That's a lot. Yeah. I have, I don't know, a few dozen, but I have realized that learning to identify and name and even just notice the life forms around me is one of the best ways to deepen
your relationship to land and to nature. Anna says you can also look up a bird count or some other bio blitz in your area. That's what they call like these nature searches. One of the biggest ones is the city nature challenge. Oh, what's that? It's basically a four day sprint around Earth Day. Cities who enroll are tasked with identifying as many of a certain type of species as possible.
It's multi-generational. So because mom and dad and grandma and grandpa and the kids can go out and the kids are low to the ground. So did that owl ever show up? Never showed. Save us the cold shoulder. But at this point in the hike, owl cameo didn't really matter. I mean, over the course of the night, just watching these grown adults act more and more like kids was so amazing, like sticking their fingers in dirt.
rolling over wet logs, jumping and shrieking when a tiny crustacean, like an isopod appear. I love it. Oh no, it's like a little shrimp. Or a tiny fungi shaped like a fan with an incredible secret. Gueso filum comone, doesn't have two sexes, doesn't have four sexes. Give me a number of how many sexes do you think? Six? Yeah, higher. 27?
and go so much higher than you think is possible for how many sexes an organism can have. I mean, 27 was the highest, you know, like, what? Hundreds? 20,000. This fungi has 20,000 different sexes. Amazing. It's very successful, very abundant, and found almost everywhere. Take a look. And then there were life forms that were moving quite actively, like... We got a salamander?
So I got low, you know, army crawling and peering through everyone's legs, hovering beneath this like chaotic cloud of science facts. It's like orange and black and slithering. It looks kind of like a smith.
One of the most interesting things I picked up was the fact that redback salamanders will bury themselves. Sometimes a foot deep in winter to basically be surrounded by decaying roots to stay warm and wet because the salamanders need the moisture to absorb oxygen through their skin. Yeah, and there's so many adaptations for winter when you really start to look for them. Sometimes that looks like a change of location. Sometimes that looks like energy conservation.
Okay, give me an example. Yeah, this was towards the end of the hike. I hear Saranella calling my name in the dark. Oh, all people look the same. We don't overlook the stick. The stick with the mushroom. Wait, is this the bioluminescent mushroom? That's right. That's right. This is the one Saranella spent the whole hike searching for. It is a honey mushroom.
our final observation of the night. So in the summertime, honey mushrooms produce a green light known as Foxfire. They glow in the dark, all on their own, no flashlight required. And we call this phenomenon bioluminescence. I am really sad to say I've never seen bioluminescence in nature, but honestly, I usually imagine it's like a frog or some kind of plankton doing the bioluminescence, not a mushroom.
Yeah, I had no idea that mushrooms bioluminesse either. Scientists don't entirely know why, but as Sarah Nella explained to me and my husband Duncan, it might be the fungi's way of attracting nocturnal creatures. You know, the glow is basically
and advertisement saying, come get me, I'm delicious. And by the way, take my kids away. So how do you advertise your Burger King at 2 AM? You need a new side that people walking by, so oh, yummy.
Hungry animals, so birds, rodents, and insects eat the mushrooms and poop it out later, which may help with spore dispersal. But that's not what I saw, Burleigh. No. No, it was winter, and apparently the honey mushrooms will shut down all bioluminescent business. They will not glow at night.
in wintertime. Timer, you did not see the green glow. Nope, just a stick of happy brown caps that were not bioluminescing at all, which I think provides a nice life lesson for wintertime, you know, about not spending energy when you don't have to.
Honestly, Emily, this hike is reminding me that that's what winter is all about, right? At least according to nature. Slow down, rest, conserve your energy, and you can consider this hike your permission slip. Thank you so much for this night walk. Anytime, Burleigh, welcome back to Shortwave. Thank you. To join the City Nature Challenge or the Great American Camp Out,
Check out the links on our website. Make sure you never miss a new episode by following us on the podcasting platform you're listening from. And if you have a science question, send us an email at shortwave at NPR.org.
This episode was produced by Jessica Young and Hannah Chin, and edited by our showrunner, Rebecca Ramirez. Tyler Jones checked the facts. Jimmy Keeley was the audio engineer. Beth Donovan is our senior director and Colin Campbell is our senior vice president of podcasting strategy. I'm Emily Kwong. And I'm Burleigh McCoy. Thanks for listening to shortwave from NPR.