Woods Hole Oceanographic Institution Archives - Page 5 of 12

Heat waves on Cape Cod may be tied to slowing ocean current

October 19, 2020 — We really baked this summer, with the Northeast and the East Coast experiencing intense heat waves.

In August alone, the Blue Hill Observatory in Milton recorded six days with temperatures over 90 degrees, four more than the average for the month. July had five days with temperatures over 90, two more than the monthly average.

While we often seek relief in the ocean, marine heat waves also occur, and those can adversely affect the creatures and plants that live there and have no refuge except deeper, colder water, if they can find it. Marine heat waves can be deadly: Researchers say “The Blob,” a large mass of warm water that extended down nearly 700 feet along 1,800 miles of North Pacific coastline, may have killed off over 62,000 common murre birds.

While most might expect that air temperatures may be driving those higher water temperatures, oceanic currents play a major role.

The Atlantic Ocean right off our doorstep is one of the fastest-warming ocean bodies on the planet, and some researchers say that may be due to a slowdown of what is known as the Atlantic conveyor belt, a massive offshore current that transports cold water from the Arctic south to the equator and returns warm water to the north and to Europe.

Read the full story at the Cape Cod Times

WHOI receives NOAA awards to study, predict harmful algal blooms

October 7, 2020 — The following was released by the Woods Hole Oceanographic Institution:

Researchers at Woods Hole Oceanographic Institution (WHOI) were recently named in a list of 17 new research projects funded by the National Oceanic and Atmospheric Administration (NOAA) to improve the nation’s collective response to the growing problem of harmful algal blooms (HABs). The four projects led, co-led, or supported by WHOI researchers total nearly $2.5 million over the coming year and $7.9 million over the course of the projects. A full list of the new grant awards is available online and includes projects funded under NOAA’s National Centers for Coastal Ocean Science (NCCOS) and the U.S. Integrated Ocean Observing System (IOOS^Ⓡ) Office.

“NOAA is funding the latest scientific research to support managers trying to cope with increasing and recurring toxic algae that continue to affect environmental and human health of coastal communities,” said David Kidwell, director of NOAA’s National Centers for Coastal Ocean Science (NCCOS) Competitive Research Program. “These projects will address the largely unknown socioeconomic impact of blooms in various regions, improve local managers’ ability to keep drinking water safe, aid monitoring for algal toxins in seafood and advance a potentially valuable control method for Florida red tide and other blooms, enhancing our nation’s collective response to these events.”

Marine and fresh waters teem with life, much of it microscopic, and most of it harmless. Although most of these phytoplankton and cyanobacteria are harmless, there are some that create potent toxins and, under the right conditions, both toxic and non-toxic species can form blooms that threaten the health of humans and ecosystems, and cause significant societal and economic problems.

These impacts include human illness and death following consumption of or indirect exposure to HAB toxins, economic losses to coastal communities and commercial fisheries, and HAB-associated wildlife deaths. Freshwater HABs can also affect drinking water supplies far from the ocean and are a growing problem as water temperatures rise, precipitation patterns change, and the use of agricultural fertilizers becomes more widespread.

Read the full release here

Ocean acidification causing coral ‘osteoporosis’ on iconic reefs

August 28, 2020 — In a paper published Aug. 27, 2020, in the journal Geophysical Research Letters, researchers show a significant reduction in the density of coral skeleton along much of the Great Barrier Reef — the world’s largest coral reef system — and also on two reefs in the South China Sea, which they attribute largely to the increasing acidity of the waters surrounding these reefs since 1950.

“This is the first unambiguous detection and attribution of ocean acidification’s impact on coral growth,” says lead author and WHOI scientist Weifu Guo. “Our study presents strong evidence that 20th century ocean acidification, exacerbated by reef biogeochemical processes, had measurable effects on the growth of a keystone reef-building coral species across the Great Barrier Reef and in the South China Sea. These effects will likely accelerate as ocean acidification progresses over the next several decades.”

Roughly a third of global carbon dioxide emissions are absorbed by the ocean, causing an average 0.1 unit decline in seawater pH since the pre-industrial era. This phenomenon, known as ocean acidification, has led to a 20 percent decrease in the concentration of carbonate ions in seawater. Animals that rely on calcium carbonate to create their skeletons, such as corals, are at risk as ocean pH continues to decline. Ocean acidification targets the density of the skeleton, silently whittling away at the coral’s strength, much like osteoporosis weakens bones in humans.

“The corals aren’t able to tell us what they’re feeling, but we can see it in their skeletons,” said Anne Cohen, a WHOI scientist and co-author of the study. “The problem is that corals really need the strength they get from their density, because that’s what keeps reefs from breaking apart. The compounding effects of temperature, local stressors, and now ocean acidification will be devastating for many reefs.”

Read the full story at Science Daily

‘A risk for the future’: How warming oceans are disrupting America’s seafood supply

May 13, 2020 — Recorded temperatures in the Atlantic Ocean are increasing at an “alarming” rate, according to one scientist, and forcing fisherman to confront a seafood industry primed for disruption.

Scientists at the Woods Hole Oceanographic Institution (WHOI) in Massachusetts recorded 2017 as the warmest year on record for water temperatures in the Northeast. Glen Gawarkiewicz, a senior scientist at the institution, said 2019 was equally “disturbing,” adding that over the past seven years, water temperatures off southern New England have increased by nine degrees Fahrenheit, faster than any region outside of the Arctic.

“The ocean is changing pretty rapidly,” Gawarkiewicz said. “Typically temperature variations might be two degrees Fahrenheit there, and fish are probably sensitive at about one degree Fahrenheit there. So it’s almost an order of magnitude more that you normally need to get some kind of change.”

Read the full story at Yahoo Finance

North Atlantic right whales are in much poorer condition than their Southern counterparts

April 27, 2020 — The following was released by the Woods Hole Oceanographic Institution:

A new study by Woods Hole Oceanographic Institution (WHOI) scientists and their colleagues reveals that endangered North Atlantic right whales are in much poorer body condition than their counterparts in the southern hemisphere. The international research team, led by Fredrik Christiansen from Aarhus University in Denmark, published their findings April 23, 2020, in the journal Marine Ecology Progress Series.

Using drones and a method called aerial photogrammetry to measure the body length and width of individual right whales in four regions around the world, the team compared body condition of individual North Atlantic right whales with individuals from three increasing populations of Southern right whales: off Argentina, Australia and New Zealand.

From aerial photographs, the researchers estimated the body volume of individual whales, which they then used to derive an index of body condition or relative fatness. The analyses revealed that individual North Atlantic right whales—juveniles, adults and mothers—were all in poorer body condition than individual whales from the three populations of Southern right whales.

“For North Atlantic right whales as individuals, and as a species, things are going terribly wrong,” says WHOI researcher Michael Moore, a coauthor of the paper. “This comparison with their southern hemisphere relatives shows that most individual North Atlantic right whales are in much worse condition than they should be.”

Read the full release here

Federal study surveys spawning Atlantic Cod

March 23, 2020 — Fisheries biologists used to rely on fishermen to tell them where fish were spawning and when. Fish are attracted to specific areas at certain times of the year, and fishermen find those important spawning grounds because the fishing is easy and the females come up bursting with eggs.

“Historically, researchers try to get in a good relationship with fishermen,” said Timothy Rowell, a research biologist with the passive acoustic research group at the National Oceanic and Atmospheric Administration’s Northeast Fisheries Science Center in Woods Hole. “They have the best local knowledge of where (the fish) are aggregating and spawning.”

Although researchers still depend on fishermen, they also use ever more sophisticated technology to help them find and study fish in the immensity of the world’s oceans. That is true of a four-year $1.3 million study of spawning fish in the sprawling blocks of ocean southeast of Block Island that are zoned to build massive offshore wind farms.

NOAA, the state Division of Marine Fisheries, Woods Hole Oceanographic Institution and the University of Massachusetts Dartmouth School of Marine Science and Technology are all participating in the study, which is funded by the U.S. Bureau of Ocean Energy Management. The research is focused on what may be one of the last remaining major seasonal spawning gatherings in the Northwest Atlantic, according to the state Division of Marine Fisheries.

Read the full story at the Cape Cod Times

New tech helps scientists detect right whales off Maine’s coast

February 24, 2020 — New acoustic monitors off Maine’s coast have detected the presence of North Atlantic right whales this winter. Scientists are trying to gather new data on the endangered animals’ whereabouts.

In mid-December, scientists put a set of underwater drones in the Atlantic Ocean. One of them is charting a zigzag course to and from Maine’s coast, starting Down East and working its way southwest. It’s currently heading eastward off Portsmouth, New Hampshire.

During its cruise, the glider’s electronic ears have heard dozens of calls from finback and humpback whales and, on seven occasions, the call of the endangered North Atlantic right whale.

“We usually figure about a 10 kilometer of five-mile radius is on average where we can hear them,” said Genevieve Davis, a scientist at the National Oceanic and Atmospheric Administration. Davis is a coordinator for the project, which also includes researchers from the Woods Hole Oceanographic Institution.

Read the full story at the Bangor Daily News

Offshore Wind to Fund New Study of Right Whales

January 28, 2020 — Ørsted is funding a project to study and protect endangered North Atlantic right whale during surveys, construction, and operation of its U.S. offshore wind facilities such as Bay State Wind and Revolution Wind.

Using data collected from an aerial, unmanned glider and two sound-detection buoys, researchers from the University of Rhode Island, Rutgers University, and the Woods Hole Oceanographic Institution will examine the habitat and behaviors of right whales in the wind-lease areas awarded to Ørsted.

An estimated 400 North Atlantic right whales remain, fewer than 100 are breeding females.

The oceanographic data will help studies of additional fish species and improve forecasting for severe storms and other weather, according to Ørsted. The three-year initiative is called Ecosystem and Passive Acoustic Monitoring (ECO-PAM).

Read the full story at EcoRI

Acoustic survey to study right whales, fish around offshore wind projects

January 23, 2020 — Acoustic sensors on buoys and an undersea drone will be used to map out the movements of endangered northern right whales, marine mammals and fish around offshore wind energy sites, in a joint project with wind developer Ørsted and marine science institutions.

Ørsted on Wednesday announced the “Ecosystem and Passive Acoustic Monitoring” project is launching in cooperation with Rutgers University, the University of Rhode Island and Woods Hole Oceanographic Institution, in addition to the company’s 2019 agreement to support Rutgers research related to wind energy development.

Rutgers will supply a Slocum electric glider, an undersea probe that can operate autonomously for weeks at a time, periodically surfacing to transmit its data back via satellite link. Now widely used in oceanography, the glider technology will be a first for Ørsted, one of the pioneer companies in European offshore wind.

Read the full story at National Fisherman

Underwater pile driving noise causes alarm responses in squid

December 17, 2019 — Exposure to underwater pile driving noise, which can be associated with the construction of docks, piers, and offshore wind farms, causes squid to exhibit strong alarm behaviors, according to a study by Woods Hole Oceanographic Institution (WHOI) researchers published Dec. 16, 2019, in the journal Marine Pollution Bulletin.

“This study is the first to report behavioral effects of pile driving noise on any cephalopod, a group including squid, cuttlefish, and octopuses,” says lead author Ian Jones, a student in the Massachusetts Institute of Technology-Woods Hole Oceanographic Institution Joint Program in Oceanography.

Squid use natural alarm and defense behaviors like inking, jetting, and changing color and patterns on their skin for communication and also for survival when they’re trying to avoid capture. Squids’ changeable skin gives them the ability to create extraordinary camouflage, enabling them to blend into the background and avoid becoming a meal.

Jones and his colleagues in the Sensory Ecology and Bioacoustics Lab at WHOI exposed longfin squid (Doryteuthis pealeii) to pile driving sounds originally recorded near the construction site of the Block Island Wind Farm in Rhode Island. The squid exhibited the same types of natural alarm and defense behaviors when they were exposed to the noises, but it’s what they did next that surprised the researcher team.

“The alarm behaviors occurred within the first several noise impulses, but they diminished quickly within the first minute of playback,” Jones says. “That suggests a learned lack of response to the noise, as the squid perceive the noise stimulus may not pose an immediate threat, unlike the imminent threat of a nearby predator. This phenomenon is called habituation.”

Read the full story at Science Daily

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