Quebec races to save western chorus frog as city builds road through wetland

In the coming months, a city on Montreal's South Shore aims to finish build‐ ing a boulevard that cuts through a thriving wetland so motorists can shave some time off their com‐ mute.

But before the black top is spread, employees of Que‐ bec's Ministry of Wildlife have been wading through the wa‐ ter-saturated forest, collect‐ ing a tiny frog and its eggs with hopes of boosting the species' population through a reproduction program hosted by the Biodome.

However, conservationists like Tommy Montpetit say that's not enough to protect the western chorus frog. "What they're doing, basical‐ ly, is annihilating the popula‐ tion that exists there," he said.

The western chorus frog lives for about a year, and he said removing eggs and frogs during the crucial breeding season may not succeed.

"We don't know what's going to happen," he said, but what's clear is the frogs will be returned to a habitat that is further destroyed by a roadway.

He wants, at the very least, for the road to be built above the wetland so the frogs can continue to move freely below.

Road project halted in 2021

The 300-metre stretch of road in Longueuil, Que., was nearly completed in 2021. The forest was clearcut. The boulevard's foundation was laid, street lights installed and manholes dug.

The city even spent about $1 million to build a wildlife corridor under Béliveau Boulevard. But that will likely cause more harm than good, Montpetit said, because predators will learn to wait by exit points to catch frogs filing through.

The road was near com‐ pletion when first a Superior

Court order and then a feder‐ al decree halted its construc‐ tion to protect the western chorus frog, a threatened species under the Species at Risk Act.

While that was going on, a municipal election was held and newly elected Mayor Catherine Fournier inherited the unfinished road. She re‐ assessed the project and found the damage can't be undone.

"The environment cannot be fully restored," her office said in a statement, so the goal is to complete the road this summer with some im‐ provements.

Improving plan with more fauna crossings

After an assessment by the province's Ministry of Wildlife, the under-the-road crossing for large fauna will be enhanced and there will be three specific crossings added for the frog, the state‐ ment says.

The road cuts through a wetland that is directly adja‐ cent to a 260-hectare nature preserve known as the Boisé du Tremblay. Fournier's of‐ fice says the city will contin‐ ue to protect the Tremblay, Roberval and Fonrouge forests, which are home to the largest population of western chorus frogs in Canada.

But work on the road will continue, connecting R-100 Street to Béliveau Boulevard, creating a straight shot be‐ tween de la Savane Road, where the Saint-Hubert Air‐ port is found, and JacquesCartier Boulevard East, at the Pierre Boucher Hospital.

The new road is designed to help dampen rush-hour traffic on Roland-Therrien Boulevard.

Meanwhile, the eggs and frogs collected from around the construction site this spring are being kept safe at the Biodome.

The tadpoles will emerge and develop in a protected environment, and the col‐ lected adults, treated with hormones, will be encour‐ aged to breed in captivity - a process that has proven ef‐ fective, according to Emiko Wong.

"It has been successful in the past. In 2016, there were almost 2,000 froglets that were born with this assisted reproduction," said Wong, head scientific advisor for conservation at the Montreal Biodome.

Along with urbanization and agriculture, climate change also plays a role in the frog's decline because water levels in ponds and wetlands are not always the same year after year, she said.

"What we are trying to do is make sure we collect the eggs at a good moment so we can protect them from any environmental threats and then after, we can re‐ lease them back into the wild," said Wong.

That means, come June, the froglets will be reintro‐ duced to the environment. Some will go back to the wet‐ land around the road con‐ struction site, and others will go to the nearby provincial park, Mont-Saint-Bruno.

Currently, there are no western chorus frogs in the provincial park, which is a good thing, said Wong, as sci‐ entists will be able to moni‐ tor the new population closely and accurately gauge the program's effectiveness.

"If we took better care of their habitats, we probably wouldn't have to do all this," she said.

"Unfortunately, this is not the case. This is why we are trying to mimic mother nature."

Conservationists worry plan won't work

Still, conservationists like Montpetit and Alain Bran‐ chaud, director of the Cana‐ dian Parks and Wilderness Society's Quebec division, are worried the breeding pro‐ gram will fail.

Branchaud said artificially reproducing the species and reintroducing them to new territories is not the way to go.

Removing the frogs cre‐ ates a gap in natural repro‐ duction, he explained. If you cut a whole year of reproduc‐ tion, the frog might disap‐ pear from that area, he said.

He would like to see the province hold off on collect‐ ing specimens for now, and he would like road construc‐ tion to be delayed another year so a better plan can be developed.

"We really need to protect the natural sites," he said. "We really need to make sure that we protect a huge area for the western chorus frog."