Posted on May 19, 2015 by Bob Berwyn
‘We may have to live with smaller cod stocks if we want to protect our seals’
FRISCO — Efforts to rebuild commercially important cod stocks off the west coast of Scotland have been hampered by hungry seals, scientists said. The research by marine biologists at the University of Strathclyde suggests that, as fishermen have cut back on their catches by half, predation by seals has rapidly increased.
The seals may be consuming more than 40 percent of the total stock of cod, up to 7,000 tons per year off the west of Scotland, where landed catches now amount to only a few hundred tons. The research paper has been published in the Journal of Applied Ecology. Continue reading
Filed under: biodiversity, Environment, Marine biology, ocean conservation | Tagged: cod recovery, marine biology, Scotland, seals | Leave a comment »
Posted on May 9, 2015 by Bob Berwyn
Study shows dramatic shift in marine species
FRISCO — Biologists looking at 40 years of fisheries data from Puget Sound have documented a dramatic shift in marine species. Key fish in the food chain, like herring and smelt, have declined, while the number of jellyfish has increased exponentially, to the detriment of the marine ecosystem.
“On land people see the changes that come with human population increases, but underwater the changes are much harder to discern,” said Correigh Greene, with NOAA Fisheries’ Northwest Fisheries Science Center. “What this tells us is that when you look over time, you can see that the underwater landscape of Puget Sound is changing too,” said Greene, lead author of the new study published in Marine Ecology Progress Series. Continue reading
Filed under: biodiversity, Environment, Marine biology, ocean conservation | Tagged: jellyfish, marine biology, ocean conservation, Puget Sound, Puget Sound fisheries | 1 Comment »
Posted on May 1, 2015 by Bob Berwyn
Video contest will award winner with a spot on a six-day Atlantic research voyage
Oceans or garbage dumps?
The winner of the 5 Gyres video contest will join the crew of the Mystic on a scientific sailing expedition. Photo courtesy 5 Gyres.
FRISCO — A short video about local solutions to ocean plastic pollution could put you aboard a six-day scientific sailing expedition aimed at learning more about the North Atlantic Gyre, where huge amounts of waste spin in a giant lazy ocean eddy — to the detriment of the ocean environment.
The contest is sponsored by the 5 Gyres Institute, named for the five major ocean circulations that trap garbage and debris. In some areas, rafts of floating garbage have enabled invasive bacteria to get a foothold in the ocean environment. Scientists have known about the problem for a long time, and they also know it’s getting worse. Continue reading
Filed under: biodiversity, Environment, Marine biology, ocean conservation | Tagged: 5 Gyres, Citizen science, Environment, Jack Johnson, ocean garbage patches, oceans, plastic pollution, sailing | Leave a comment »
Posted on April 24, 2015 by Bob Berwyn
Seismic airgun blasting, naval warfare training are key sources of harmful ocean noise pollution
FRISCO — With ever more offshore oil and gas exploration proposed, conservation advocates have been warning that the cumulative effects of those activities will take a huge toll on dolphins, whales and other marine life.
Of particular concern are plans to ramp up seismic underwater airgun blasting, used in the search for oil and gas deposits beneath the seafloor. Federal officials recently adopted a final proposal that would allow the use of this controversial technology in an area twice the size of California, stretching from Delaware to Florida. Continue reading
Filed under: endangered species, Environment, gas drilling, Marine biology, ocean conservation, oil drilling | Tagged: dolphins, marine mammals, Noise pollution, ocean noise, oceans, seismic airgun blasting | Leave a comment »
Posted on April 5, 2015 by Bob Berwyn
‘We humans have to think carefully about the planet we are leaving for future generations’
Using driftwood logs as paddles, local fishermen head out to set nets along the northern coast of Jamaica. @bberwyn photo.
FRISCO — It may take oceans thousands of years to recover from global warming impacts, California-based scientists said after study a seafloor sediment core sample that tracked the impacts of ancient climate upheavals.
The study, led by scientists with the UC Davis Bodega Marine Laboratory and Coastal and Marine Sciences Institute, looked at more than 5,400 invertebrate fossils, from sea urchins to clams, in a 30-foot sediment core from offshore Santa Barbara, California.
The core sample documents changes in the ocean ecosystem between 3,400 and 16,100 years ago, during the last major deglaciation, which was a time of abrupt climate warming, melting polar ice caps, and expansion of low oxygen zones in the ocean. Continue reading
Filed under: climate and weather, Environment, global warming, Marine biology, ocean conservation | Tagged: climate change, Environment, global warming, ocean dead zones, oceans | Leave a comment »
Posted on March 27, 2015 by Bob Berwyn
CU-Boulder scientists study document decline of calcification rates in marine organisms around Antarctica
The Southern Ocean may lose its ability to function as a carbon sink. bberwyn photo.
*More Summit Voice stories on ocean acidification
FRISCO — The steady increase of atmospheric carbon dioxide is already causing large-scale shifts in the ocean carbon cycle, according to University of Colorado, Boulder scientists, who calculated the calcification rate of marine organisms in the Southern Ocean.
According to the scientists there has been a 24 percent decline in the amount of calcium carbonate produced in large areas of the Southern Ocean over the past 17 years. Continue reading
Filed under: climate and weather, Environment, global warming, Marine biology, ocean conservation | Tagged: carbon dioxide, CO2, global warming, greenhouse gases, ocean acidification, phytoplankton, Southern Ocean | Leave a comment »