Tag: Trout

Global warming speeds diversity threats to native fish

Study looks at hybridization of trout in Northern Rocky Mountains

Biologists study trout in the Blue River in Silverthorne, Colorado. @bberwyn photo.

Staff Report

Global warming is intensifying the hybridization of native and non-native trout in the northern Rocky Mountains, according to a new study from the U.S. Geological Survey and other scientists. The trend is a serious threat to the biodiversity of Rocky Mountain aquatic ecosystems, says the study published in the journal Global Change Biology.

As non-native rainbow trout, introduced by early settlers, interbreed with cutthroat trout it leads to a decline in local adaptations that can threaten the long-term survival of species. Preserving the  genetic integrity of native species is important for  resiliency, the scientists said. Continue reading “Global warming speeds diversity threats to native fish”

Advertisements

Sunday set: Wien scene

City sights …


A short photographic stroll through a city that consistently ranks near the very top worldwide for quality of life.  Vienna’s coffee houses and parks are definitely part of its charms, but it’s also a European hub science, culture, literature and tech innovation. And there are connections to my old stomping grounds in Colorado. For example, I spent several years following the story of how parasitic whirling disease wiped out most of Colorado’s rainbows, and how biologists were working to restore the popular game fish with a population resistant to the disease. Then last summer, as I was working on a story about a massive fish die-off in the Yellowstone River, my research led me to an Egyptian-born research scientist at the University of Vienna who has been studying various parasitic trout diseases, and linking them with global warming. Turns out that Mansour El-Matbouli also was an instrumental figure in the efforts to breed the strain of rainbow trout that are resistant to whirling disease, and that he had worked closely with aquatic biologists in Colorado that I also had interviewed for my stories in Colorado. We’re facing global environmental challenges, and they require a global and science-based response. It’s a small world.

At the nexus of climate change and invasive species

What happens when the trout streams warm?

A palm-size brook trout, caught in the Tenmile Creek drainage near Copper Mountain.
A palm-size brook trout, caught in the Tenmile Creek drainage near Copper Mountain. @bberwyn photo.

Staff Report

U.S. Geological Survey scientists have completed one of the first experimental studies to explore links between climate change and invasive species, specifically how  brook trout and brown trout interact with rising stream temperatures. They found that non-native browns limit the ability of brook trout to use warmer water temperatures, By contrast, removin of browns brook trouts’ reach into warmer waters.

Brookies are freshwater fish native to eastern North America and threatened by climate change because of their requirement for cold stream temperatures. Brown trout are native to Europe and have been introduced all around North America. Continue reading “At the nexus of climate change and invasive species”

Study says high mountain streams serve as ‘climate refuge’

There’s hope for coldwater fish in the West, especially if resource managers are able to plan and implement conservation measures

CDOW Aquatic biologist Jon Ewert holds a rainbow trout for measurement while sampling fish populations in the Blue River in Silverthorne, Colorado.
CDOW Aquatic biologist Jon Ewert holds a rainbow trout for measurement while sampling fish populations in the Blue River in Silverthorne, Colorado. @bberwyn photo.

Staff Report

Global warming is hitting the high mountain world especially hard, with records from recent decades showing temperatures above 13,000 feet increasing 75 percent faster than at lower elevations in some regions. But for a while at least, the high country may end up being a last-ditch climate refuge for many species, including cold-water fish.

A recent study suggests that water temperatures in mountain streams aren’t going up as fast as previously projected. That means there’s time to survey ecological communities and plan conservation strategies, according to a new study published in the Proceedings of the National Academy of Sciences. Continue reading “Study says high mountain streams serve as ‘climate refuge’”

Environment: UK study shows how heavy metal pollution alters genetics of trout populations

sdfg
Some trout populations in Colorado have been affected by toxic heavy metal pollution from abandoned mines.

Historic UK mining contamination has cut genetic diversity of brown trout

Staff Report

FRISCO — In a study that has implications for Colorado rivers and fish, scientists in the UK have shown that heavy metal pollution from mining has dramatically reduced  genetic diversity of brown trout.

The University of Exeter researchers say their findings show that human activity can alter the genetic patterns of wild populations — an important issue in modern conservation. Continue reading “Environment: UK study shows how heavy metal pollution alters genetics of trout populations”

It’s free fishing weekend in Colorado

Fishing for brookies at Officers Gulch Pond, in Summit County, Colorado.
Fishing for brookies at Officers Gulch Pond, in Summit County, Colorado. Bob Berwyn photo.

No license needed June 1-2

By Summit Voice

SUMMIT COUNTY — There’s no better way to start the summer than by wetting a line in one of Colorado’s sparkling streams or lakes, and to celebrate the start of the angling season, Colorado Parks and Wildlife is once again offering free fishing this weekend (June 1-2).

Each year, the agency designates the first weekend in June as the only two-day period that anglers all around the state are not required to have a fishing license. For the rest of the year a fishing license is required for anyone 16 years and older. Check all the Colorado Parks and Wildlife fishing online here and check out this guide for popular Summit County fishing spots here. Continue reading “It’s free fishing weekend in Colorado”

Colorado: Trouble in trout paradise

asdf
Please click on the image to watch the short video clip.

An exclusive Summit Voice interview with Fraser Trout, a homeless fish seeking some love (and water) in the Colorado River Basin

By Summit Voice

SUMMIT COUNTY — The Defend the Colorado coalition’s new video, “Trout in Trouble,” features a lost-looking trout leaving his dried-up streambed in the Fraser Valley to go seek water in the big city of Denver, where he panhandles on the streets with a sign reading, “Anything helps.” A passing motorist gives him a bottle of water that he sprinkles over his head, but the expression on his face tells us it’s not enough.  The video’s message: Denver Water needs to do more to protect the Fraser River from future diversions to the Front Range.

The “homeless trout’s” performance has been hailed for its authenticity and raw power, with Denver’s Westword calling the film reminiscent of Chaplin and Capra.  Others have compared the trout to a young Brando.

Defend the Colorado has offered Summit County Citizens Voice an exclusive interview with the trout. The following is a highly edited transcript. Please click the read more button to check it ou. Continue reading “Colorado: Trouble in trout paradise”