The biggest amphibians in Maine have invaded its lakes and ponds — Act Out — Bangor Each day News — BDN Maine


Crawling by way of the muck at the bottom of Maine lakes, mudpuppies are huge amphibians that have been accidentally introduced to the state in 1939, and have been perplexing ice fishermen ever because.

“Surprisingly, we’ve recognized extremely small about mudpuppies till not too long ago,” stated Phillip deMaynadier, biologist for the Maine Division of Inland Fisheries and Wildlife.

In 2017, the DIF&ampW teamed up with the University of Maine and Colby College to understand a lot more about this non-native species and how it is impacting aquatic ecosystems in Maine. Now two years later, they’ve discovered that the state’s mudpuppy population is thriving — and it has spread.

What’s a mudpuppy?

The biggest amphibian in Maine, mudpuppies can exceed 16 inches in length. They’re salamanders, but in contrast to Maine’s other salamander species, they’re waterbound. Breathing by way of huge, feathery external gills, they crawl along the bottom of lakes, streams and rivers.

In addition to becoming exceptionally huge, they’re very colorful. Their bodies are gray or brownish-gray with dark blue spots, and their gills are red. They have flat heads, wide tails, stubby legs and 4 toes on every foot.

With the scientific name Necturus maculosus, mudpuppies are also often named “water dogs” due to the barking sound they often make.

Courtesy of Trevor Persons

Courtesy of Trevor Persons

The mudpuppy is an invasive amphibian that has infiltrated a number of Maine lakes and ponds.

How they invaded Maine

Native to the Midwest, the mudpuppy was accidentally released into Terrific Pond in Belgrade, Maine, in 1939, by a Colby College professor who was studying them at the time.

“He imported them from Pennsylvania and had them in enclosures in the hatchery stream [connected to Great Pond],” deMaynadier stated. “He did it twice, basically. They escaped in 1940, as properly.”

Due to the fact this amphibian spends its complete life in the muck and its nocturnal, it simply flies beneath the radar. Even so, more than the years, Maine fishermen have reeled in this frilly creature, to their bewilderment.

The DIF&ampW applied this anecdotal proof in the study to choose exactly where to begin their search.

Exactly where can you discover them?

To capture mudpuppies, the DIF&ampW applied modified minnow traps baited with dog meals and shiners. For the duration of the winter, they drilled holes in the ice of a number of lakes and ponds, then dropped the traps by way of the holes and lowered them to the bottom. There the traps remained for a week ahead of becoming pulled back up.

With this process, researchers captured hundreds of mudpuppies. In truth, their capture prices have been greater than prices recorded by any biologist in the mudpuppy’s organic variety.

“They’re not just eking out an existence right here,” deMaynadier stated. “They’re thriving.”

Via this trapping work, researchers verified the existence of mudpuppies in a number of lakes and ponds in the Belgrade Watershed. Lengthy Pond in Belgrade and Rome had the highest capture price, with researchers recording an typical of 1.five mudpuppies per trap, per evening. And McGrath Pond in Belgrade and Oakland had the second highest capture price, with an typical of .9 mudpuppies per trap per evening.

Courtesy of Phillip deMaynadier

Courtesy of Phillip deMaynadier

Maine researchers placed this tag on the traps that they set for mudpuppies in many ponds and lakes more than the previous two years.

Other ponds and lakes in the Belgrade Watershed exactly where mudpuppies have been confirmed by way of trapping include things like Terrific Pond (exactly where they initially escaped), North Pond, Messalonskee Lake and Togus Pond.

In addition, following anecdotal proof, researchers discovered mudpuppies in Lengthy Pond in Livermore, which is a element of the Androscoggin Watershed. This issues biologists, thinking about mudpuppies are waterbound and for that reason unable to spread to unique watersheds on their personal.

“Maybe they moved through the bait bucket,” stated deMaynadier. “Or perhaps there was a organic lead to [such as a bird carrying them].”

Researchers are interested if mudpuppies have spread even additional. If you have noticed a mudpuppy in any Maine waterbody that is not listed above, you can enable the study by reporting your sighting to deMaynadier at [email protected] Consist of the place and date of the sighting, as properly as a photo, if you have a single.

How they’ve furthered science

The mudpuppy project also presented an chance for UMaine researchers to expand their operate with Environmental DNA, which has not too long ago been applied to track uncommon fish in Maine.

Environmental DNA or eDNA is DNA that is expelled by an organism into their atmosphere in numerous types, such as shed skin cells or feces. This is then collected in environmental samples, such as soil, water or even air, and applied to track particular organisms.

The mudpuppy project is “a classic example” of how eDNA can be applied, stated Michael Kinnison, UMaine science lead for the Maine-eDNA system and professor of evolutionary applications.

“If this was an animal that men and women could see readily at any time, say a bird, there’s a fantastic opportunity men and women would be in a position to spot it and count it,” Kinnison explained. “Where eDNA comes in handy is when dealing with organisms that are somewhat uncommon or complicated to discover or unfamiliar to men and women.”

For the duration of the study, the UMaine eDNA lab worked with the DIF&ampW to gather water samples from bodies of water, then confirm their findings primarily based on information collected from the mudpuppy traps.

“We’re definitely obtaining there,” Kinnison stated. “We’ve created the lab tool. We’ve shown that it will detect mudpuppy DNA down to forensic levels — a handful of molecules of DNA in a liter of water. Now we’re operating on how to deploy the tool in the field to use it proficiently.”

In August, the National Science Foundation awarded a $20 million grant to a 5-year Maine Environmental DNA initiative to additional create the technologies at UMaine, Bigelow Laboratory for Ocean Sciences and beyond. 1 of their objectives is to expand the variety of organisms they can detect with eDNA. One more is to make the technologies accessible to citizen scientists for monitoring.

What influence do mudpuppies have?

To get an notion of the influence mudpuppies have on aquatic ecosystems in Maine, DIF&ampW teamed up with Catherine Bevier, professor of biology at Colby College. With the enable of her students, she dissected hundreds of mudpuppies to get a image of what they’re consuming.

“It’s all macro invertebrates,” stated Bevier. “We see a lot of crayfish and a lot of amphipods and stonefly larvae and dragonfly larvae. It is been very variable. I’m operating correct now to finish it up.”

The principal goal of studying the mudpuppy’s eating plan is to see if they’re consuming any species listed as threatened or endangered in Maine. So far, Bevier hasn’t discovered any of these species in her dissections, but she has discovered that mudpuppies will consume taxa (or groups) of animals that do include threatened species, such as dragonflies.

“Some of these taxa do have species of conservation concern inside them, so that is some thing that is a small bit regarding,” deMaynadier stated.

Courtesy of Phillip deMaynadier

Courtesy of Phillip deMaynadier

A researcher deploys a baited minnow trap on McGrath Pond in Belgrade, to capture mudpuppies for a project led by the Maine Division of Inland Fisheries and Wildlife, in collaboration with the University of Maine and Colby College.

What now?

Like a lot of other non-native species that have discovered their way to Maine, the mudpuppy is right here to remain — at least for the foreseeable future. There’s no realistic way to eradicate the species from Maine lakes and ponds devoid of negatively impacting the other species living in these ecosystems, deMaynadier stated. But items can be performed to protect against the salamander from spreading into other bodies of water.

“By studying about what ponds they’re in and sort of retrospectively mapping out their movement more than the final 70-80 years, we can see how they’ve spread and which water bodies are most vulnerable [to them invading next],” deMaynadier stated.

Due to the fact mudpuppies are waterbound, they can be blocked with physical barriers, such as waterfalls and dams. In addition, public outreach may possibly play a function in stopping their spreading.

From speaking with neighborhood fishermen, deMaynadier has discovered that mudpuppies are deemed to be fantastic bait for huge fish like bass and northern pike.

“We could place out signage and educate anglers to the truth that it is illegal to use them as bait,” he stated.

The project is scheduled to be wrapped up in spring of 2020.



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