Fostering gives genetic boost to wild Mexican wolves

This undated photo shows Mexican gray wolf pups that are part of a fostering program.

ALBUQUERQUE, N.M. — It’s a carefully planned mission that involves coordination across state lines — from Mexican gray wolf dens hidden deep in the woods of New Mexico and Arizona to breeding facilities at zoos and special conservation centers around the U.S.

It’s also about timing, as wolves in the wild and those in captivity need to be having pups at the same time to ensure a smooth transition.

Pups born within a couple days of each other are the best candidates for a fostering program that aims to get more pups out of captivity and into the wild in hopes of boosting the genetic diversity of the endangered species.

“It’s really a balance of science and astrology — because the stars have to align,” said Maggie Dwire, a biologist with the U.S. Fish and Wildlife Service team that oversees recovery of Mexican gray wolves in the American Southwest.

U.S. officials claimed success Tuesday, saying 12 pups were placed this year with packs living in a mountainous region along the New Mexico-Arizona state line.

That marks the most pups fostered in a single breeding season since biologists first attempted the technique in 2014 by moving wild-born pups from one wild pack to another.

In 2016, they tried placing captive-born pups with wild packs, discovering that the survival rate of the foster pups was on par with those born in the wild.

Since 2014, 30 pups have been fostered by wild packs, another handful has been transferred among wild packs and seven were taken from the wild and reared by captive parents.

Jim deVos, assistant director for wildlife management at the Arizona Game and Fish Department, called the fostering project one of the most important when it comes to recovering the species.

More Mexican wolves are in the wild now than at any time since they were nearly exterminated decades ago. Mexican wolves, a subspecies of the Western gray wolf, have faced a difficult road to recovery that has been complicated by politics, legal fights and conflicts involving livestock.

At least 131 of the predators now span southwestern New Mexico and southeastern Arizona.

Members of a field team track the wild wolves via radio collars. When females stop roaming, that usually means they’re ready to den. The team will keep watch, knowing that pups will likely be born in about two months.

Officials at the captive breeding facilities also monitor their pairs for denning behavior.

“That’s the astrology part,” Dwire said. “Whichever facility aligns is the one we’re going to pull from.”

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