There was one thing unusual concerning the turquoise-colored songbird flying round San Antonio in 2023. With its black-and-white tail bands and its jeering honk, it considerably resembled and gave the impression of a blue jay. Nevertheless it had the face and low, two-tone rattling name of a inexperienced jay.
The fowl turned out to be an extraordinarily uncommon hybrid that some are calling a “grue jay.” Genetic testing confirmed the hybrid fowl had a inexperienced jay mom and a blue jay father, scientists report September 10 in Ecology and Evolution.
Although fowl hybrids aren’t unusual, a pairing between these two jays is exceptional as their ranges solely not too long ago started to overlap resulting from human exercise, says Timothy Keitt, an ecologist and evolutionary biologist on the College of Texas at Austin.
The inexperienced jay (Cyanocorax yncas) is a tropical fowl. On the flip of this century, the one place they lived inside the USA was the Rio Grande Valley close to the Texas–Mexico border. The fowl’s vary extends all through Mexico and Central America, spanning as far south as Honduras. Nonetheless, as a result of warming local weather, inexperienced jays have unfold north by a whole bunch of kilometers and several other levels in latitude.
“And it occurred fairly rapidly, perhaps a 20-year-period,” Keitt says.
On the similar time, the vary of the blue jay (Cyanocitta cristata) is reaching farther west throughout Canada and the USA, together with into south central Texas. Ecologists recommend blue jays are following people into new areas, searching for wealthy meals sources in suburban environments.
Hybridization within the wild normally happens between species that share a latest frequent ancestor. Nonetheless, the evolutionary cut up between blue jays and inexperienced jays was at the very least 7 million years in the past throughout the late Miocene Epoch. (The final frequent ancestor of people and chimpanzees additionally lived round this time.)
The truth that two organisms, which have been evolving independently, got here collectively to provide a viable offspring after 7 million years is wonderful, says Jamie Alfieri, an evolutionary biologist who researches speciation on the College of Iowa in Iowa Metropolis.
“It’s only a actually very long time. I imply, I don’t understand how else to say that. It’s a extremely large quantity,” says Alfieri, who was not concerned in Keitt’s research.
Why a inexperienced jay crossed the species divide to mate with a blue jay is a thriller. It may have been that each birds have been drawn to novelty. Keitt says there have been situations the place a brand new track kind has been most well-liked amongst birds on the lookout for mates. For instance, researchers on the College of Lancaster discovered that a male blue tit is extra prone to maintain a feminine’s consideration if he sings a singular track.
One other speculation is that each birds have been on the far edges of their ranges. Unable to discover a mate amongst their very own species, pairing up was a kind of last-ditch effort.
Each methods are a danger: Hybrids are typically sterile, although with birds, hybrid males are extra seemingly to have the ability to reproduce than females. The noticed grue jay is male, so it’s attainable that it’s going to have offspring.
However whereas each blue and inexperienced jays are extremely social, the grue jay gave the impression to be by itself. Maybe the opposite blue jays that have been within the space acknowledged that it was completely different and wouldn’t settle for it into their group.
Whereas Keitt doubts that blue and inexperienced jays will merge into a brand new species, this hybrid highlights the bizarre and speedy ecological adjustments occurring resulting from human exercise.
“So buckle in, people,” he says. “We’re going to see very completely different outcomes,” a number of uncommon climate and mixes of vegetation and animals we’ve by no means seen previously.
