Tag Archives: ocean

Fishing for Answers off Fukushima

By Guest PostNovember 19, 2012Environmentcatastrophic damage, cesium, contaminated sediment, contamination, dai ichi, earthquake, fish, fukushima, fukushima prefecture, implication, Japan, japanese coast, japanese public, ken buesseler, maff, marine environment, mitsuo uematsu, northeast, northwest, nuclear power plant, ocean, pacific ocean, public health, radiation, radiation level, radioactive isotope, radionuclides, reactor site, release, seafloor, seaweed, shellfish, tokyo, triple disaster, tsunami, university, world

Japan fisheries data provides a look at how the ocean is faring 18 months after the worst accidental release of radiation to the ocean in history

Japan’s “triple disaster,” as it has become known, began on March 11, 2011, and remains unprecedented in its scope and complexity. To understand the lingering effects and potential public health implications of that chain of events, scientists are turning to a diverse and widespread sentinel in the world’s ocean: fish.

Events on March 11 began with a magnitude 9.0 earthquake, the fourth largest ever recorded. The earthquake in turn spawned a massive 40-foot tsunami that inundated the northeast Japanese coast and resulted in an estimated 20,000 missing or dead. Finally, the wave caused catastrophic damage to the Fukushima Dai-ichi nuclear power plant, resulting in the largest accidental release of radiation to the ocean in history, 80 percent of which ended up in the Northwest Pacific Ocean. (more…)

Small Organisms Could Dramatically Impact World’s Climate

By Guest PostOctober 26, 2012Environment21st century, atmospheric, carbon, carbon dioxide, christopher klausmeier, climate change, colin kremer, cycle, david garrison, diversity, element, elena litchman, equatorial water, evolutionary adaptation, food chain, global climate, impact, level, marine microorganism, michigan, mridul thomas, nitrogen, ocean, ocean floor, organism, phosphorous, photosynthesis, phytoplankton, population, science express, state university, temperature, tropical water, warmer

EAST LANSING, Mich. — Warmer oceans in the future could significantly alter populations of phytoplankton, tiny organisms that could have a major impact on climate change.

In the current issue of Science Express, Michigan State University researchers show that by the end of the 21st century, warmer oceans will cause populations of these marine microorganisms to thrive near the poles and may shrink in equatorial waters. Since phytoplankton play a key role in the food chain and the world’s cycles of carbon, nitrogen, phosphorous and other elements, a drastic drop could have measurable consequences. (more…)

Speaking of Ethics

By Guest PostOctober 22, 2012Environmentatmosphere, baby albatross, bird, bottle caps, brown lab, carbon dioxide, climate change, climate crisis, delaware, distribution, earth, Environment, environmental ethics, environmental philosopher, ethical responsibility, extinction, gulf, history, human, human rights, joy, kathleen dean moore, life, Mexico, moral obligation, Nature, notion, ocean, oil companies, oil spill, oregon, organism, planet, plastic, principle, protect, relationship, species, spring creek project, state university, stomach, university, violation, world

Lecturer explores the imperatives of environmental ethics

Speaking to University of Delaware faculty and students and community members in Brown Lab on Monday night, Oct. 15, environmental philosopher Kathleen Dean Moore discussed how important it is for humans to realize their ethical responsibility to save the world from a climate crisis.

In a lecture titled “Why It’s Wrong to Wreck the World: Climate Change and the Moral Obligation to the Future,” Moore reflected on the relationship humans have with the environment and argued that once humans realize the impact of their actions, they will naturally feel a moral obligation to care for the planet. (more…)

Shark Social Networking

By Guest PostOctober 17, 2012Natureacoustic tags, acoustic transmitter, apex predator, battery recharge, behavior, biotelemetry, coast, coastal water, concern, conventional, danielle haulsee, delaware, delaware bay, delmarva peninsula, device, dewayne fox, east coast, eastern seaboard, ecological balance, georgia aquarium, habitat, identification sensor, indian river, inlet, maryland, matthew oliver, migration pattern, mobile transceiver, network, ocean, ocean observation, oceanographic, otis, real-time, remote controlled, researcher, shark migration, species, telemetry, tiger shark, tracking technique, transmitter, underwater robot, university, vemco, vmt

Shark migrations studied with underwater robot along Delmarva Peninsula

University of Delaware researchers are using an underwater robot to find and follow sand tiger sharks that they previously tagged with transmitters. The innovative project is part of a multi-year partnership with Delaware State University to better understand the behavior and migration patterns of the sharks in real time.

“In the past week our new, specially equipped glider OTIS – which stands for Oceanographic Telemetry Identification Sensor – detected multiple sand tiger sharks off the coast of Maryland that were tagged over the past several years,” said Matthew Oliver, assistant professor of oceanography in UD’s College of Earth, Ocean, and Environment. “This is the first time that a glider has found tagged sharks and reported their location in real time.” (more…)

Scientists Uncover Vast Differences in Earth’s Polar Ocean Microbial Communities

By Guest PostOctober 10, 2012Environmentalison murray, Antarctica, arctic ocean, biodiversity, biodiversity pattern, biogeographically, canada, changing climate, coast, community, continental, drainage basin, earth, environmental selection, flow, france, freshwater, glacial melt, global ocean, jean françois ghiglione, kevin bakker, marine, marine life, marine microbe, michigan, microbial community, microbial diversity, new zealand, ocean, oceanic circulation, oden, polar ocean, polar region, polar year, pole, sea ice, sloan foundation, southern, spain, structure, Sweden, swedish icebreaker, united states, university

ANN ARBOR— An international team of scientists, including a University of Michigan graduate student, has demonstrated that a clear difference exists between the marine microbial communities in the Southern and Arctic oceans, contributing to a better understanding of the biodiversity of marine life at the poles.

The most comprehensive comparison of microbial diversity at both of Earth’s polar oceans showed that about 75 percent of the organisms at each pole are different. This insight sheds light on newly recognized biodiversity patterns and reinforces the importance of studying Earth’s polar regions in the face of a changing climate. And it highlights the need for further research on the impacts of sea ice, seasonal shifts and freshwater input in both regions. (more…)

Researchers Highlight Growing Problem of Ocean Acidification

By Guest PostSeptember 27, 2012Environmentatmosphere, carbon biogeochemistry, carbon dioxide, CO2, co2 conditions, co2 world, earth, emission, eucidaris tribuloides, faq, global issue, hole, institution, logarithmic, monterey, neutral, oa, ocb, ocean, ocean acidification, oceanographic, pencil urchins, ph, ph scale, ph unit, sarah cooley, tropical, web version, whoi, woods

An international group of scientists, including researchers from the Woods Hole Oceanographic Institution, are working to improve communication about ocean acidification to help the public better understand the pressing global issue.

The term “ocean acidification” (OA) describes the changes that occur in the ocean as a result of increased emissions of carbon dioxide (CO₂) into the atmosphere. The rising acidic level in the ocean puts certain organisms at risk and threatens the overall health of the ocean. (more…)

Large Bacterial Population Colonized Land 2.75 Billion Years Ago

By Guest PostSeptember 26, 2012Scienceatmosphere, atmospheric oxygenation, cambrian period, continental rock, data, database, david catling, earth, Environment, eva stueken, event, geologist, great, methane, microbial life, molybdenum, ocean, oxidation, oxygen, ozone layer, research record, roger buick, sulfur, ultraviolet radiation, university, Washington, weathering pyrite

There is evidence that some microbial life had migrated from the Earth’s oceans to land by 2.75 billion years ago, though many scientists believe such land-based life was limited because the ozone layer that shields against ultraviolet radiation did not form until hundreds of millions years later.

But new research from the University of Washington suggests that early microbes might have been widespread on land, producing oxygen and weathering pyrite, an iron sulfide mineral, which released sulfur and molybdenum into the oceans. (more…)

Tracking Fish Through a Coral Reef Seascape

By Guest PostSeptember 4, 2012Environment, Naturecoastal seagrass, coastal wetland, coral reef, dream divers, ear bones, ehrenbergs snapper, fish, food web, functional connectivity, gas chromatography, isoscape, isotope signature, juvenile, kelton mcmahon, king abdullah, lutjanus ehrenbergii, mangrove habitat, marine environment, michael berument, migration, northern coast, nursery habitat, ocean, offshore island, offshore reef, otoliths, plasticity, record, red sea, reef ecosystem, reef fish, remediation, saudi arabia, scientist, simon thorrold, subtropical water, tree rings, tropical habitat, tropical seascape, university, whoi

Ear-bone ‘tree rings’ provide evidence of connectivity

Ocean scientists have long known that juvenile coral reef fishes use coastal seagrass and mangrove habitats as nurseries, later moving as adults onto coral reefs. But the fishes’ movements, and the connections between different tropical habitats, are much more complex than previously realized, according to a study published September 3 in Proceedings of the National Academy of Sciences. The findings have important implications for management and protection of coral reefs and other marine environments.

A number of studies have demonstrated a strong relationship between the presence of coastal wetlands and offshore fish abundance and fisheries yield, but it has proved difficult to develop quantitative assessment of habitat use by fish or their movement among different habitats. “The rationale for this study,”says Simon Thorrold, a biologist at Woods Hole Oceanographic Institution (WHOI), “was to determine the relative importance of different nursery habitats to reef fishes that spend their adult lives on coral reefs but may spend at least part of their juvenile residency elsewhere.” (more…)