Scientist find source of mysterious Southern Ocean sound

New data could help minke whale conservation efforts

A group of Antarctic minke whales. Photo courtesy Ari S. Friedlaender, Oregon State University

A group of Antarctic minke whales, which have been identified as the source of a mysterious sound in the Southern Ocean. Photo courtesy Ari S. Friedlaender, Oregon State University.

Staff Report

FRISCO — If you’ve ever heard mysterious sounds that you can’t identify, you’re not alone. For decades, researchers have tried to trace the source of a unique rhythmic sound in the remote Southern Ocean that’s often been recorded, but never definitively pinpointed — until now.

This week, scientists with NOAA’s Northeast Fisheries Science Center said the sound is generated by the Antarctic Minke whale, the smallest of the “great whales” or rorquals, a group that includes the blue whale, Bryde’s whale, and humpback, fin, and sei whales. Rorqual whales are relatively streamlined in appearance, have pointed heads and, with the exception of humpback whales, small pointed fins. Continue reading

Oceans: Satellite data shows leatherback sea turtles ranging far and wide in search of jellyfish

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A leatherback sea turtle at sea. Photo courtesy NOAA.

New study to help inform conservation efforts along East Coast and Caribbean

By Summit Voice

FRISCO — Threatened leatherback sea turtles like to hang out off the northeastern U.S. coast in late summer and fall, when mature jellyfish are abundant in the area, scientists said last week, sharing the results of a long-term study based on satellite data of tagged sea turtles.

“Our study provides new insights about how male and immature turtles behave, how they use their habitats and how that differs from adult females,” said University of Massachusetts researcher Kara Dodge. “Resource managers for protected marine species have lacked this key understanding, especially in coastal regions of the U.S. and Caribbean where leatherbacks and intense human activity coincide.” Continue reading

Do farmed salmon threaten wild populations?

Salmon species.

Salmon species.

Millions of escaped domestic salmon could overwhelm genetic pool of wild fish

Staff Report

FRISCO — Farmed salmon represent a clear threat to wild populations based simply on the sheer numbers of domesticated fish that escape their pens. Millions  of farmed salmon escape captivity each year, potentially with huge consequences for the genetics of wild populations, according to a new study from the University of East Anglia.

The researchers concluded that, while farmed salmon are genetically different to their wild counterparts, they are just as fertile. With full reproductive potential to invade wild gene pools, farmed salmon should be sterilized, the study concluded. Continue reading

More whales moving north through Bering Strait

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Scientists see changes in the way marine mammals use the Bering Strait. Photo courtesy NASA.

Scientists say mitigation needed to protect marine life in the region

Staff Report

FRISCO — American and Russian scientists studying the Bering Strait say that global warming is changing the way marine mammals use the area. Species at home farther south are using the narrow passage to the Arctic Ocean much more often, the researchers said after monitoring the area for three years with underwater microphones.

The recordings show Arctic beluga and bowhead whales migrating seasonally through the region from the Arctic south to spend winter in the Bering Sea. They also detect large numbers of sub-Arctic humpback, fin and killer whales traveling north through the Bering Strait to feed in the biologically rich Chukchi Sea. Continue reading

Environment: Scientists warn about use of seismic airguns in never-ending quest for more fossil fuels

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Seismic airgun testing poses a risk to marine mammals.

Marine mammals at risk off the East Coast

By Summit Voice

FRISCO — The fossil fuel industry’s use of seismic airgun testing to search for as-yet untapped offshore oil deposits could prove damaging to ocean species — especially marine mammals that depend on acoustic information.

Unless federal agencies use the best available science to design effective avoidance and mitigation strategies, thousands of dolphins and whales could be affected, including critically endangered North Atlantic right whales, with a dwindling population of only 500 individuals. Continue reading

Study documents ‘heartbreak’ after Gulf oilspill

Former Breckenridge resident Andy Cook, who owned and operated Ma's Po Boy restaurant on Park Avenue, cleans a yellowfin tuna he caught in the rich fishing waters near the mouth of the Mississippi River, just off Venice, Louisiana.

Former Breckenridge resident Andy Cook cleans a yellowfin tuna he caught in the rich fishing waters at the mouth of the Mississippi River near Venice, Louisiana. bberwyn photo.

Exposure to PAHs disrupts basic cellular function of heart muscles

By Summit Voice

FRISCO — When BP’s failed Deepwater Horizon drill rig spewed millions of gallons of oil into the Gulf of Mexico, scientists immediately began documenting impacts to natural resources, finding dead corals on the seafloor, sick dolphins in Barataria Bay and remnant oil in the splash zone along Florida beaches.

Even low levels of oil pollution can damage the developing hearts of fish embryos and larvae, reducing the likelihood that those fish will survive. Scientists have known of this effect for some time, but the underlying mechanism has remained elusive.

But recent research by scientists with NOAA and Stanford University, shows how oil-derived chemicals disrupt the normal functioning of the heart muscle cells of fish. The findings, published in the Feb. 14 issue of Science, describe how toxic oil-based chemicals disrupt cardiac function in young bluefin and yellowfin tuna by blocking ion channels in their heart muscle cells. Continue reading

Biodiversity: Counting whales — from space

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New satellite technology could help biologists getter more accurate estimates of whale populations  NOAA photo.

New method could help with marine mammal conservation planning

By Summit Voice

FRISCO — After using satellite images to discover new emperor penguin colonies in Antarctica, scientists with the British Antarctic Survey said they’ve also been able to use similar technology to count whales.

Marine mammals are extremely difficult to count on a large scale and traditional methods, such as counting from platforms or land, can be costly and inefficient, so the new method could lead to breakthroughs in estimating populations of whales and other marine mammals. Continue reading

Oceans: Iceland faces sanctions over whaling

Whale is on the menu in some Iceland restaurants. bberwyn photo.

Whale is on the menu in some Iceland restaurants. bberwyn photo.

U.S. officials say whaling trade violates international conservation treaty

By Summit Voice

FRISCO — Iceland may face trade sanctions after U.S. officials formally declared that the island nation’s whaling is undermining an international ban on commercial trade in whale products.

The declaration by U.S. Secretary of Interior Sally Jewell may have been spurred in part by Iceland’s December announcement that commercial whaling will continue for the next five years. As many as 154 endangered fin whales and 229 minke whales could be killed each year under Iceland’s self-allocated quotas which are set to run from 2014 to 2018.

Iceland killed 35 minke whales and 134 fin whales, massive animals second only to blue whales in size, during the 2013 whaling season. Whaling has deep cultural and economic roots in Iceland, and the fishing industry is by far the largest sector of the country’s economy, but wildlife and animal rights advocacy groups say it’s time for Iceland to rethink its whaling activities. Continue reading

German travel company says no to dolphin shows

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An orca swims in the Antarctic Sound. bberwyn photo.

Decision based on animal welfare concerns

By Summit Voice

FRISCO — Germany’s largest travel agency and tour operator has announced that it won’t be offering any more trips to destinations that keep whales and dolphins in captivity.

TUI Deutschland officials made the decision after aligning themselves with an advocacy group that has highlighted just a few of the problems faced by captive cetaceans, including tiny enclosures and disruption of social structures.

TUI also cited information from the CNN documentary Blackfish, which is set to air once again on Feb. 9. The company also said it won’t offer trips to destinations that advertise swimming with dolphins, according to the German publication Die Welt.

While facilities like SeaWorld and other marine parks see themselves as good stewards of marine mammals, public pressure is growing to end the practice of showing whales and dolphins for entertainment.

German wildlife advocates said recent worldwide attention on the gruesome dolphin slaughter in Taji also helped push the huge tour operator toward the decision.

Oceans: Study highlights threats to sharks and rays

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Majestic manta rays are among the species identified as facing a significant threat. Photo courtesy NOAA.

‘Unless binding commitments to protect these fish are made now, there is a real risk that our grandchildren won’t see sharks and rays in the wild …’

By Summit Voice

FRISCO — Overfishing is putting about 25 percent of the world’s sharks and rays at risk of extinction, according to ocean experts who took a close look at the global distribution, catch, abundance, population trends, habitat use, life histories, threats and conservation measures.

Previous studies have documented local overfishing of some populations of sharks and rays, but this is the first survey of their status throughout coastal seas and oceans. According to the findings, 249 of 1,041 known shark, ray and chimaera species globally fall under three threatened categories on the IUCN Red List.

“We now know that many species of sharks and rays, not just the charismatic white sharks, face extinction across the ice-free seas of the world,” said Nick Dulvy, a Simon Fraser University Canada Research Chair in Marine Biodiversity and Conservation. “There are no real sanctuaries for sharks where they are safe from overfishing,” Dulvy said. Continue reading

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