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 »
Posted on November 14, 2013 by Bob Berwyn
Bird populations are declining at Loch Neagh, in Northern Ireland. Photo courtesy NASA Landsat.
Warmer temps in northeastern Europe shifting bird migration patterns
By Summit Voice
FRISCO — Biologists studying wildlife at Lough Neagh say the number of overwintering birds at the largest lake in the British Isles has dropped dramatically in just a few decades.
The decline is due to a quirky combination of improved water quality and global warming, according to researchers at Queen’s University Belfast. Cutting nutrient pollution has suppressed algae in the lake, which means less food for snails and aquatic bugs, and in turn, less food for diving birds.
And, warmer temperatures across northeastern Europe means the birds don’t have to fly all the way to Northern Ireland to find a place to spend the cold season.
The study by Quercus, Northern Ireland’s Centre for Biodiversity and Conservation Science, found the number of diving ducks migrating to the lake for the winter months has dropped from 100,000 to less than 21,000 in the space of a decade. Continue reading
Filed under: biodiversity, climate and weather, Environment, global warming | Tagged: Birds, climate change, enviroment, global warming, Loch Neagh, migratory birds | Leave a comment »
Posted on November 13, 2013 by Bob Berwyn
Broad-tailed hummingbirds may have a hard time finding food during the short breeding season as temperatures in the Colorado Rocky Mountains continue to warm steadily. bberwyn photo.
Earlier nesting and breeding observed in some species
By Summit Voice
FRISCO — Some birds are nesting and hatching earlier because of steadily increasing global temperatures, and that may be driving earlier migration in some species according to scientists with the University of East Anglia.
Changes in migration timing has already been linked with a biological disconnect between some species and their primary food sources, for example hummingbirds that fly to the southern Rocky Mountains, as well as purple martins that fly from South America to eastern North America. Both species arrival is increasingly out of synch with key food sources.
“We have known that birds are migrating earlier and earlier each year … particularly those that migrate over shorter distances,” said Lead researcher Dr. Jenny Gill from UEA’s school of Biological Sciences. “But the reason why has puzzled bird experts for years. It’s a particularly important question because the species which are not migrating earlier are declining in numbers.” Continue reading
Filed under: biodiversity, climate and weather, Environment, global warming, Iceland | Tagged: Birds, Environment, global warming, migration, phenology | 2 Comments »
Posted on October 5, 2013 by Bob Berwyn
Native bird has nearly been extirpated from the West
Yellow-billed cuckoos are only found in a few isolated locations in Colorado.
By Summit Voice
FRISCO — The yellow-billed cuckoo, once common along streams throughout the West, may finally get some protection under the Endangered Species Act.
The U.S. Fish and Wildlife Service has proposed Endangered Species Act protection for the brids, following a 2011 agreement with the Center for Biological Diversity to speed protection decisions for 757 imperiled species nationwide.
The flashy bird, with a long tail and white markings on it wings, has long been listed as a species of concern by Colorado wildlife biologists, as their numbers have dropped drastically since the early 20th century. Click here to read a Rocky Mountain Bird Observatory report on yellow-billed cuckoos in Colorado. Continue reading
Filed under: biodiversity, endangered species, Environment | Tagged: biodiversity, Birds, Colorado River, endangered species, riparian habitat, yellow-billed cuckoo | 2 Comments »