Posted on May 27, 2014 by Bob Berwyn
Cutthroat trout. Photo courtesy National Park Service.
30-year study shows how warmer stream temperatures are linked with hybridization
FRISCO — Scientists studying trout in the northern Rockies say warmer stream temperatures and lower spring flows in mountain streams is increasing the pace at which introduced rainbow trout and native cutthroats interbreed. Hybridization has already contributed to the decline and extinction of many native fishes worldwide, including all subspecies of cutthroat trout in western North America.
The long-term research shows that, while hybridization used to be limited to lower stream reaches, during the past 30 years, it has quickly spread upstream as temperatures warm. According to the scientists, the process is irreversibly reducing the genetic integrity of native westslope cutthroat trout populations. Genetically pure populations of westslope cutthroat trout are known to occupy less than 10 percent of their historical range. Continue reading
Filed under: climate and weather, Environment, global warming, invasive species | Tagged: Cutthroat trout, Environment, Flathead River, global warming, hybridization, Northern Rockies | 1 Comment »
Posted on February 24, 2014 by Bob Berwyn
Forest Service wants to reconnect an aquatic ecosystem that was sliced apart by dredges in the mining era
Restoration plans are afoot for a degraded section of the Swan River, in Summit County, Colorado.
By Bob Berwyn
FRISCO — For all the gold Summit County’s old-timers managed to pull from local mountains and rivers, they left behind quite a mess. Along with toxic pollution oozing into rivers from some abandoned mines, other streams were turned completely inside-out, buried under tons of gravel.
That includes the Swan River, near Breckenridge, where the U.S. Forest Service now hopes to reverse some of the damage with an ambitious five- to 10-year restoration project.
The Forest Service aims to recreate of two miles of stream, riparian, and restore uplands that were all destroyed by the dredge boats. The agency also wants to decommission some roads in the area, build a new road and trail, all within a mix ownership of private, county, town, and national forest lands. Another element of the project would create fish barriers to protect populations of cutthroat trout. Continue reading
Filed under: Colorado, Dillon Ranger District, Environment, rivers, Summit County news, US Forest Service, water, White River National Forest | Tagged: Cutthroat trout, Environment, restoration, Swan River | 1 Comment »
Posted on October 1, 2012 by Bob Berwyn
Fishing disasters in Alaska, the Gulf of Mexico and New England may all be linked with global warming.
Fracking, cutthroat trout and Colorado weather …
Environment: Probe of Arctic scientist ends inconclusively
SUMMIT COUNTY —A Kafka-esque federal probe of a polar biologist ended inconclusively this week, as biologist Charles Monnett got a mild slap on the wrist for an alleged breach of policy that was unrelated to the focus of the 2.5-year investigation.
Filed under: climate and weather, Colorado, global warming | Tagged: climate, Colorado weather, Cutthroat trout, endangered species, Environment, fisheries, Summit County News, wildlife | Leave a comment »
Posted on September 24, 2012 by Bob Berwyn
What next for Colorado’s state fish?
A Rio Grande cutthroat trout. Photo courtesy Andrew Todd.
By Bob Berwyn
SUMMIT COUNTY — After some genetic sleuthing and intensive scrutiny of historic fish-stocking records, a team of federal, state and university biologists said they’ve pinned down Colorado’s greenback cutthroat trout to just a single population — about 750 fish, all living in a four-mile reach of Bear Creek, a small Arkansas River tributary in the mountains west of Colorado Springs.
Greenback cutthroats — the Colorado state fish — were originally native to the South Platte drainage, but now appear to survive only in that single population outside of the species’ native range.
Biologists say native cutthroats in Colorado declined because of pollution, overfishing and stocking of native and non-native species of trout. Continue reading
Filed under: biodiversity, Colorado, endangered species, Environment | Tagged: Colorado, Colorado native fish, Cutthroat trout, endangered species, Greenback cutthroat trout, United States Fish and Wildlife Service | 2 Comments »
Posted on March 21, 2012 by Bob Berwyn
Licenses for the 2012-2012 season on sale; state fishery experts warn against ‘bucket biology’
Fishing in glassy water at a "hidden" cove along the shore of Dillon Reservoir.
By Summit Voice
SUMMIT COUNTY — Early spring weather might not be the best thing for skiers looking to extend the season, but it could be good news for Colorado anglers looking to get early access to high country lakes and streams.
And with the 2o12-2012 license year just a few weeks away, it could be a good time to make sure you’re ready by buying or renewing your license. The latest fishing brochure, with regulations and other info, is also available where licenses are sold and online at http://www.flipseekpubs.com/publication/?i=99616.
Memorial Day fishing at the Dillon Marina.
Filed under: Colorado, Colorado Division of Wildlife, Colorado State Parks, fishing, recreation, seasons, Summit County Colorado | Tagged: 2012 fishing season, brook trout, Colorado, Colorado fishing regulations, Cutthroat trout, fishing, fishing license, Rainbow Trout, Summit County fishing | 1 Comment »
Posted on August 17, 2011 by Bob Berwyn
Habitat expected to shrink by 50 percent in coming decades
Anglers may have to climb high to find fish as global warming takes a toll on trout.
By Bob Berwyn
SUMMIT COUNTY — A combination of rising temperatures and changes in the timing of runoff and streamflows could reduce trout habitat in the western U.S. by about 50 percent during the next 70 years, with some populations disappearing completely within just a few decades.
The mechanisms for temperature-driven extirpations are complex, but the bottom line is that an ever-warming world isn’t going to leave much room for cold-blooded fish.
“They operate within a very narrow temperature range,” said U.S. Geological Survey biologist Andrew Todd. Variations in temperature can affect spawning, even if the temperatures don’t reach levels that are directly lethal to the fish, Todd said.
And the hydrology is also important, he explained. Even small changes in the amount and timing of precipitation can have a big impact on smaller headwaters streams. And unlike birds or mammals, trout don’t have the ability to move freely if conditions become unsuitable.
“They can’t just go to Montana,” Todd said. Continue reading
Filed under: climate and weather, Colorado, Environment, global warming, Summit County news | Tagged: climate change impacts to trout, Colorado State University, Cutthroat trout, Environment, global warming, Global warming and trout, Proceedings of the National Academy of Sciences, Summit County News, United States, western trout | 7 Comments »
Posted on January 18, 2011 by Bob Berwyn
It’s not always about what you catch …
Boy and dog, keeping cool on a summer day at Trent Park, one of several stocked ponds at neighborhood parks in Summit County, Colorado.
SUMMIT COUNTY — Wow! The many fishing pics in the archives made me realize how much quality time I spent with my son last summer alongside local ponds, reservoirs and streams. Often, Kellen came along, which worked out really well, giving me a chance to work wirelessly, as in the photo above, while the boys caught supper — or not. Enjoy the photoblog from some of our favorite Colorado fishing holes and take your kids outside and fishing this summer. It’s one of the few things I’ve found that can compete with the attractive nuisance of video games. Continue reading
Filed under: Colorado, Colorado Division of Wildlife, Colorado State Parks, daily photoblog, Morning photo, photography, Silverthorne, Summit County Colorado | Tagged: Clinton Gulch Reservoir, Colorado fishing, Cutthroat trout, Dillon Reservoir, Summit County Colorado, Summit County fishing, Summit County photography, Trent Park | Leave a comment »