Saving Seafood

Long-running plankton survey to resume this winter

October 28, 2020 — Scientists this winter will revive a long-running survey of plankton in the Gulf of Maine. Plankton, drifting microscopic sea organisms, are food for endangered North American right whales and other marine species. 

The Gulf of Maine plankton survey was originally performed from 1961–2017. It is returning under a new agreement between the National Oceanic and Atmospheric Administration’s (NOAA) Northeast Fisheries Science Center, the Marine Biological Association in Plymouth, England, and the Massachusetts-based Woods Hole Oceanographic Institution.  

“Many marine species are shifting their distributions as ocean waters warm,” said Chris Melrose, a research oceanographer at the Northeast Fisheries Science Center’s laboratory in Narragansett, R.I. “Because plankton are an important food source for many species, including the endangered North Atlantic right whale, knowing about changes in the plankton helps us to understand other changes we see in the ecosystem.” 

Melrose, who is NOAA representative on the agreement, said continuing the survey “is essential to understanding the impact of climate change to marine ecosystems.”  

Read the full story at the Mount Desert Islander

Long-Running Plankton Survey to Resume in the Gulf of Maine

October 23, 2020 — The following was released by NOAA Fisheries:

A new agreement between NOAA’s Northeast Fisheries Science Center, the Marine Biological Association in Plymouth, England and the Woods Hole Oceanographic Institution will allow a plankton survey to resume. The survey was originally conducted across the Gulf of Maine from 1961 to 2017.

NOAA Fisheries is providing funding for the survey through the NOAA Cooperative Institute for the North Atlantic Region, hosted by the Woods Hole Oceanographic Institution. The Marine Biological Association manages merchant vessel-based plankton surveys around the world. The association will run and maintain the resumed Gulf of Maine survey through 2024 under this agreement.

“Continuing a long-term time series like the Continuous Plankton Recorder Survey is essential to understanding the impact of climate change to marine ecosystems,” said Chris Melrose, a research oceanographer at the Northeast Fisheries Science Center’s laboratory in Narragansett, Rhode Island and NOAA representative on the agreement.

“Many marine species are shifting their distributions as ocean waters warm,” explained Melrose. “Because plankton are an important food source for many species, including the endangered North Atlantic right whale, knowing about changes in the plankton helps us to understand other changes we see in the ecosystem.”

Read the full release here

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

Studies investigate marine heatwaves, shifting ocean currents

September 22, 2020 — In a paper published September 17 in the Journal of Climate, WHOI oceanographers and collaborators at the GEOMAR Helmholtz Centre for Ocean Research Kiel in Germany use a new model to understand how ocean processes affect marine heatwaves at depth off the west coast of Australia. Known as “Ningaloo Niño,” these extreme warming events have caused mass die-offs of marine organisms, coral bleaching, and potentially permanent ecosystem shifts, all of which impact fisheries and the economies that depend on them.

“This area is a hotspot for increasing temperature and extreme events, with drastic impacts on regional marine species,” said lead author Svenja Ryan. “It’s important to understand where in the water column temperature and salinity changes are happening so you can determine how the ecosystem will be impacted.”

For the first time in the Southern Indian Ocean, Ryan and her co-authors, WHOI physical oceanographers Caroline Ummenhofer and Glen Gawarkiewicz, showed that the effects of marine heatwaves extend to 300 meters or more below the surface along the entire west coast of Australia. They found that during La Niña years, the southward-flowing Leeuwin Current becomes stronger and is associated with warm temperature anomalies at greater depths. These conditions were observed during the 2011 marine heatwave that led to the first-recorded coral bleaching at Ningaloo Reef, a World Heritage site, and extensive loss of a nearby kelp forest. During El Niño periods, the temperature and salinity anomalies associated with marine heatwaves are limited to the ocean surface, showing that complex ocean processes play an important role in the depth-extent of extreme events.

Ryan and her colleagues are using a similar modeling approach to study marine heatwaves in the Northwest Atlantic. “The challenge, wherever you go, is that marine heatwaves have so many drivers,” Ryan said. “Understanding different types of events and their associated depth structure is crucial for regional impact assessment and adaptation strategies, as well as for predicting potential changes in a future climate.”

Read the full story at Science Daily

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

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