Rare yellow birds need wild roses to survive in British Columbia: researcher
A little yellow bird's rescue from the brink of extinction in British Columbia hinges on an oft-overlooked wild flower in the province's Okanagan region, according to one Canadian government researcher.
The importance of local wild roses emerged over a nearly 20-year experiment concentrating on the yellow-breasted chat, a tiny bird whose characteristics and precarious status have preoccupied scientists for decades.
At the beginning of the 21st century, the population at one breeding site on the grounds of the Okanagan Valley's En'owkin Centre stood at just one pair.
Today it's grown to roughly 22 pairs, a phenomenon Environment and Climate Change Canada researcher Christine Bishop largely attributes to the rejuvenation of wild roses in the area.
Bishop said human appetite for shoreline development, combined with livestock grazing, led to the depletion of the prickly wild rose bushes she described as providing the birds' ideal nesting conditions.
“They nest in forests along shorelines. And that's one of the key reasons why population declined,” she said.
“Everybody wants to develop or live near waterfront . ... It's definitely a habitat that's under threat continually.”
Bishop said yellow chat populations exist beyond the borders of the En'owkin centre, but have been all but eradicated in Ontario and go largely unmonitored in the Prairies. Bishop estimated B.C.'S total yellow chat population at about 250 pairs.
Environment Canada teamed up with the En'owkin Centre — an Indigenous post-secondary institution — and the Nature Trust of B.C. to try to revitalize chat populations in the southern Okanagan Valley.
They fenced off about 70 kilometres along a stream, resulting in 455 protected hectares.
The results allowed previously trampled wild rose plants to regrow, Bishop said, linking their regeneration to the spike in local yellow chat pairs.
Bishop said the birds' preferred habitat in B.C. is wild rose bushes along shorelines with willow and cottonwood forests.
Sometimes they nest in habitats with poison ivy as long as it is intermingled in a thicket of wild rose, she added, noting humans don't often recognize such environments for the vital wildlife habitats they are.
Bishop said chats have provided no end of scientific puzzles over the years, a fact even reflected in the species name.
Chats produce about 40 distinctive sounds, including imitations of other bird calls, but can't be classified as songbirds because they don't sing.
She said their vibrant yellow hue prompted researchers to categorize them as warblers for decades, but that classification was undercut by their roughly 25-gram weight, more than twice the size of an average bird of that type.
“In 2017, they actually created its own family. And it's the only species in that family, because it cannot be classified,” she said.
Researchers are also concerned about the effects of climate change on the chat's habitat.
The watercourses will change into grasslands if it gets too dry in the Okanagan, making it unsuitable for these birds, Bishop said.