Tag: Environment

Environment: Massive fish kill reported in Yellowstone River

A Colorado Division of Wildlife biologist holds a young rainbow trout before releasing it into the Blue River in Silverthorne. The fingerling was raised in a cross-breeding program to develop a strain of fish resistant to parasitic whirling disease that all but wiped out rainbow trout across parts of the West.
A  young rainbow trout @bberwyn photo.

Disease may be exacerbated by warm water, low stream flows

Staff Report

The Yellowstone River, part of Montana’s iconic western landscape, is once again beset by environmental woes, as a rapidly spreading fish kill has spurred state resource managers to close the river to all recreational uses, including fishing, boating and tubing. Biologists with Montana Fish, Wildlife and Parks said they’ve counted more than 2,000  dead mountain whitefish, and the estimate the total mortality in the tens of thousands. The river was also hammered by an oilspill in 2011 after pipeline burst. Continue reading “Environment: Massive fish kill reported in Yellowstone River”

Neonicotinoid pesticides implicated in decline of wild bees across the UK

New study helps explain bee die-offs

bees and neonicotinoids
A new study in the UK once again links declining wild bee populations with exposure to systemic neonicotinoid pesticides. @bberwyn photo.

Staff Report

Researchers with the UK’s Centre for Ecology and Hydrology have released a new study linking neonicotinoid pesticides with a long-term decline of wild bee species.

The study, published in the journal Nature Communications, analyzed changes in the population of 62 wild bee species, comparing them with patters of oilseed rape crops between 1994 and 2011, as the use of commercial use of neonicotinoids became widespread.

The findings suggest that systemic pesticides contributed to a “large-scale and long-term decline” in wild bee species distributions and communities. Species that regularly forage on treated rape fields declined, on average, three times as much as species that feed on a wider variety of plants, showing that oilseed rape is a principle mechanism of neonicotinoid exposure among wild bee communities. Continue reading “Neonicotinoid pesticides implicated in decline of wild bees across the UK”

Study eyes tourism threat to sustainable fisheries in Caribbean

A spiny lobster in the Florida Keys Marine Sanctuary. Photo courtesy NOAA.
A spiny lobster in the Florida Keys Marine Sanctuary. Photo courtesy NOAA.

Under-reporting of catches documented by nonprofit research group

Staff Report

The marine environment around some Caribbean islands is still threatened by unsustainable fishing, according to a new study that documents the under-reporting of catches in the Turks and Caicos Islands. According to the research, catches on the islands were 86 percent higher than what was reported to the UN’s Food and Agriculture Organization, a finding with troubling implication for sustainable fisheries efforts.

The research team from the nonprofit Sea Around Us program says urgent policy action is needed to ensure the future sustainability of the fishing industry in this archipelago nation. The findings were published in open-access journal Frontiers in Marine Science. Continue reading “Study eyes tourism threat to sustainable fisheries in Caribbean”

Genetic study tracks westward spread of bat-killing disease

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White-nose syndrome is wiping out bats across the U.S. Photo courtesy USGS.

Are humans responsible for  the big jump to the West Coast?

Staff Report

Genetic analysis shows that the bat-killing fungus recently detected for the first time in western North America is  similar to strains found in the eastern United States. That means there is a good chance that humans were involved in spreading the disease, according to conservation advocates who want resource managers to step up efforts to halt the spread of the fungus by restricting cave tourism.

The new study, published in the journal mSphere, has implications for resource managers battling the spread of a disease that has wiped out millions of bats in North America. It provides new clues about the origin of this strain of the Pseudogymnoascus destructans fungus, or Pd. The latest case of WNS near North Bend, Washington was about 1,300 miles from the previous westernmost detection in Nebraska. Continue reading “Genetic study tracks westward spread of bat-killing disease”

New study documents biodiversity in proposed deep sea mining zone

Researchers call for balance between mining and ecosystem protection

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A species of cnidarian in the genus Relicanthus with 8-foot long tentacles attached to a dead sponge stalk on a nodule in the eastern Clarion-Clipperton Zone. These are closely related to anemones. Photo credit: Diva Amon and Craig Smith, University of Hawai’i at Mānoa.

Staff Report

New research shows that proposed mining on the seafloor of the Pacific Ocean would likely have a huge impact on marine biodiversity. A study published in the journal Scientific Reports, documents an “impressive abundance and diversity among the creatures” on the seafloor in the Clarion-Clipperton Zone — an area in the equatorial Pacific Ocean being targeted for deep-sea mining.

“We found that this exploration claim area harbors one of the most diverse communities of megafauna (animals over 2 cm in size) to be recorded at abyssal depths in the deep sea,” lead author Diva Amon said in a press release.

The researchers explained that a combination of biological, chemical and geological processes formed a high concentrations of polymetallic “manganese” nodules on the deep seafloor in the CCZ–an area nearly the size of the contiguous United States. These nodules are potentially valuable sources of copper, nickel, cobalt and manganese, among other metals, which has led to an interest in mining this region. Continue reading “New study documents biodiversity in proposed deep sea mining zone”

Study says old, weathered oil from spills is even more toxic to fish than fresh crude

Scientists still studying Deepwater Horizon spill impacts

Oil from BP's failed Deepwater Horizon drill rig and the Macondo well spread across the ocean in May 2010. PHOTO COURTESY NOAA.
Oil from BP’s failed Deepwater Horizon drill rig and the Macondo well spread across the Gulf of Mexico in May 2010. Photo courtesy NOAA.

Staff Report

It’s been six years since BP’s Deepwater Horizon drilling rig in the Gulf of Mexico failed disastrously, but scientists are still learning about how the oil affected ocean species and ecosystems.

In findings from new study released this week, researchers from the University of California, Riverside and the University of Miami Rosenstiel School of Marine and Atmospheric Science reported that old, weathered oil from the spill is even more toxic than fresh crude oil. Ultraviolet light changes changes the chemistry of the oil, the scientists said, further threatening numerous commercially and ecologically important fishes.

The Deepwater Horizon oil disaster was the worst on U.S. history. More than 3 million barrels of oil spilled into the Gulf, contaminating spawning habitats for many fishes. The oil also killed deep sea corals and had a devastating effect on dolphin reproduction. Continue reading “Study says old, weathered oil from spills is even more toxic to fish than fresh crude”

Air pollution seen as another factor in honeybee decline

Ozone degrades scent molecules

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Air pollution makes it harder for bees and other insects to find flowers. @bberwyn photo.

Staff Report

Air pollution is changing plant odors, which confuses bees and makes them less efficient at foraging and pollinating plants, Penn State researchers said in a new study that shows how ozone breaks down plant-emitted scent molecules.

The chemical interactions decrease both the scent molecules’ life spans and the distances they travel, the scientists reported in the new study. They found that plant-emitted hydrocarbons break down through chemical interactions with certain air pollutants such as ozone. This breakdown process results in the creation of more air pollutants, including hydroxyl and nitrate radicals, which further increase the breakdown rate of plant odors. Continue reading “Air pollution seen as another factor in honeybee decline”