Posted on August 20, 2014 by Bob Berwyn
Feds map critical habitat for yellow-billed cuckoo
Will yellow-billed cuckoos make a comeback in Colorado?
By Summit Voice
FRISCO — The long endangered species odyssey of the yellow-billed cuckoo may be one step closer to resolution, as federal wildlife officials this week proposed designating more than half a million acres of critical habitat for the birds, sometimes known as rain crows for their habit of singing before a storm.
The bird was once common along most rivers and streams in the West, but the decline of the species, eyed for protection since 1986, shows how much human activities have degraded riparian riverside habitat. Yellow-billed cuckoos are neotropical migrants that winter in South America and nest along rivers and streams in western North America. Continue reading
Filed under: biodiversity, Colorado, endangered species, Environment | Tagged: biodiversity, Birds, Colorado, endangered species, Environment, riparian habitat, rivers, yellow-billed cuckoo | 1 Comment »
Posted on July 20, 2014 by Bob Berwyn
Systemic neocotinoid pesticides are starting to affect bird populations, according to research.
Neonicotinoid use linked with decline in bird populations
By Summit Voice
FRISCO — Populations of some insect-eating bird species are declining in areas where scientists measured high concentrations of a widely used neonicotinoid pesticide.
In some cases, bird numbers are dwindling by as much as 3.5 percent annually, according to the new study by researchers with Radboud University in Nijmegen and the Dutch Centre for Field Ornithology and Birdlife Netherlands. Continue reading
Filed under: biodiversity, Environment | Tagged: Birds, Environment, neonicotinoids, pesticides, Silent Spring | Leave a comment »
Posted on July 16, 2014 by Bob Berwyn
New model unravels some of the complexities of how wildlife will respond to global warming
FRISCO — Populations of familiar backyard birds like the rufous hummingbird and evening grosbeak are declining, a trend that may be linked with changes in precipitation patterns across the western U.S.
Scientists studying the changes with a new model say precipitation, rather than temperature, may be the the main factor in determining how birds will respond to climate change.
Several past studies have found that temperature increases can push some animal species – including birds – into higher latitudes or higher elevations. Few studies, however, have tackled the role that changes in precipitation may cause, according to Matthew Betts, an Oregon State University ecologist and a principal investigator on the study. Continue reading
Filed under: biodiversity, climate and weather, Environment, global warming | Tagged: biodiversity, Birds, climate change, Environment, global warming, rufous hummingbirds | Leave a comment »
Posted on April 22, 2014 by Bob Berwyn
Scientists track decline of iconic Galápagos birds
FRISCO — Populations of blue-footed boobies, one of the Galápagos Islands iconic species, have dwindled by a third since the 1960s, mainly because the birds don’t seem to be finding the food they need to breed and raise chicks.
The population decline is so steep that the birds are in danger of dying out, according to a new study published in the journal Avian Conservation and Ecology. The researchers found that sardines have all but disappeared from the birds’ diet, said Wake Forest University biology professor Dave Anderson. Without that primary food source, adult birds are simply choosing not to breed, he said. Continue reading
Filed under: biodiversity, Environment | Tagged: biodiversity, Birds, blue-foote boobies, conservation, Galapagos Islands, wildlife | 2 Comments »
Posted on April 5, 2014 by Bob Berwyn
Study offers new insight into long-distance avian migration.
‘We think that these behaviors represent a previously unknown cognitive ability …’
FRISCO — Some migrating birds may be able to sense weather patterns on a hemispheric scale, helping them optimally time their nonstop transoceanic flights.
Bar-tailed godwits, the ultra-marathon champions of migration, breed in Alaska and spend winters in New Zealand and a recent U.S. Geological Survey-led study suggests that these birds can sense broad weather patterns.
Careful monitoring of the birds suggest they time their departure to match the best possible atmospheric wind conditions possible within a two-week window. Remarkably, not only were the conditions optimal for take-off, but they almost always provided the best possible conditions for the birds’ entire flights, as far as 7,000 miles in eight days between Alaska and New Zealand.
Filed under: biodiversity, Environment | Tagged: bar-tailed godwits, Birds, Environment, migration, weather | 4 Comments »
Posted on March 8, 2014 by Bob Berwyn
Some bird populations are shifting fast in response to climate change. bberwyn photo.
‘The rapidity with which these changes are happening is a big deal’
*More Summit Voice stories on birds and climate change here.
By Summit Voice
FRISCO — Watching climate change is a little more subtle than just sitting around watching a thermometer, but sometimes even scientists are surprised at just how fast things are changing.
A group of East Coast university researchers probably felt that way as they studied the breeding areas of Carolina and black-capped chickadees. Along a narrow zone in the eastern U.S., the two species interbreed, and that overlap zone is moving northward at 0.7 miles per year — a full-on sprint by geological time standards. Continue reading
Filed under: biodiversity, climate and weather, Environment, global warming | Tagged: Birds, climate change, global warming | 1 Comment »
Posted on December 11, 2013 by Bob Berwyn
Annual survey helps track population trends, potential threats
A red-tailed hawk perches on a snag in the Williams Fork Range in Summit County, Colorado. bberwyn photo.
By Summit Voice
FRISCO — Experienced birders and novices alike are invited to join in one of the longest-running citizen science surveys in the world — the 114th annual Christmas Bird Count, set this year for Dec. 14 through Jan. 5, 2014.
This year, Colorado Parks and Wildlife is hosting an event at the State Forest State Park, near Gould. The 71,000-acre park includes alpine lakes, forests and peaks along the west side of the Medicine Bow Mountains and into the north end of the Never Summer Range. Continue reading
Filed under: biodiversity, Environment | Tagged: biodiversity, bird-watching, Birds, Christmas Bird Count, Colorado, wildlife | Leave a comment »