Meteorologist explains El Niño, likely to develop this winter
Ecosystem-Based Fisheries Management
NOAA strives to adopt an ecosystem-based approach throughout its broad ocean and coastal stewardship, science, and service programs. The goal of ecosystem-based management is to maintain ecosystems in a healthy, productive, and resilient condition so they can provide the services humans want and need. NOAA Fisheries refers to the ecosystem-based approach to management that is focused on the fisheries sector as ecosystem-based fisheries management (EBFM). While EBFM is directed towards fisheries management, a similar approach, accounting for ecosystem interactions and considerations, can be applied in the management of protected and other trust marine species.
EBFM is a new way of looking at the management of living marine resources. The traditional management strategy for fisheries and other living marine resources is to focus on one species in isolation. For example, if a particular species’ population was declining, fishery managers might decide to reduce the annual catch limit the following year in an attempt to reduce overexploitation. However, fishing is only one variable that affects a species’ population. Additional elements come in to play, such as interactions with other species, the effects of environmental changes, or pollution and other stresses on habitat and water quality. To more effectively assess the health of any given fishery and to determine the best way to maintain it, fishery managers should take ecosystem considerations into account.
Videos:
Fisheries in the California Current Ecosystem
Fisheries in the Northwest Atlantic Large Marine Ecosystem
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A Bird’s Eye View: Aerial Surveys of Nearshore Waters Provide Important Information for Managing Coastal Pelagic Fishes
An unretouched aerial photo of a sardine school off Southern California
Since August 2012, CDFW’s Coastal Pelagic Species (CPS) Project and the California Wetfish Producers Association have been working together to develop a nearshore aerial survey program for southern California waters. The valuable data collected by the program may be used to set sustainable harvest limits and prevent overfishing of CPS, including Pacific sardine, Pacific mackerel, and northern anchovy.
A primary focus of the program is developing scientifically rigorous aerial survey methods. Over the first four field seasons, Pacific sardine schools were mostly observed close to shore along either mainland or island coasts. Boat-based groundtruthing confirmed the accuracy of aerial fish identification, and provided critical biological and environmental data.
Starting in summer 2013, other CPS were quantified including northern anchovy and Pacific mackerel. Both aerial and boat survey methods have been refined to improve data collection efficiency and accuracy, and staff have begun integrating all CPS observations into the program. Information from the aerial surveys will help to increase our understanding of the abundance and distribution of CPS in southern California.
CDFW coordinates with NOAA Fisheries and other West Coast agencies through the Pacific Fishery Management Council (PFMC) to manage Pacific sardine and other CPS fisheries included in the federal CPS Fishery Management Plan. PFMC uses stock assessments to set sustainable harvest limits that prevent overfishing of CPS populations. Once enough data are collected, CDFW will request that the PFMC include the California aerial survey data in future stock assessments of Pacific sardine and, potentially, other CPS. California aerial surveys would complement other types of surveys currently included in stock assessments, such as the ship-based acoustic surveys and fish egg surveys conducted farther off shore.For more information about Pacific sardine research and management, please visit CDFW’s Pacific sardine webpage.
View original post: CDFW Marine Management News
A bigger chance of El Niño returning in 2014, but with little rain
An image from the Jet Propulsion Laboratory shows a pair of warmer Kelvin waves heading towards the South American coast. NASA/JPL
El Niño can’t seem to make up its mind. After climatologists had previously stated that the chances of the warming weather phenomenon occurring this winter were becoming ever slimmer, it seems that there may now be a “glimmer of hope for a very modest comeback,” according to a press release from NASA’s Jet Propulsion Laboratory.Ocean temperatures in equatorial Pacific had been rising earlier this year — indicating El Niño conditions. But they fell over the summer — dashing hopes for much needed rain.Satellite images now show that warmer eastward “Kelvin waves” are headed towards the South American coast in the next two months, indicating a resurgent El Niño weather pattern. However, if El Niño triggers a wetter winter, it probably won't mean drought-busting rain.“If I was to compare where we are at with El Niño with where we were in ‘97-‘98, which was the Godzilla El Niño, I would call this one the gecko El Niño,” JPL climatologist Bill Patzert tells KPCC. He says El Niños can be small and modest and have little to no impact whatsoever on our rainfall.NASA scientists will continue to monitor the Pacific for any changes.Watch NASA video of El Niño forming earlier this year.http://youtu.be/zaxPwASV2kY
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Unusual North Pacific warmth jostles marine food chain
September 2014 | Scientists across NOAA Fisheries are watching a persistent expanse of exceptionally warm water spanning the Gulf of Alaska that could send reverberations through the marine food web. The warm expanse appeared about a year ago and the longer it lingers, the greater potential it has to affect ocean life from jellyfish to salmon, researchers say."Right now it's super warm all the way across the Pacific to Japan," said Bill Peterson, an oceanographer with NOAA's Northwest Fisheries Science Center in Newport, Ore., who has linked certain ocean indicators to salmon returns. "For a scientist it's a very interesting time because when you see something like this that's totally new you have opportunities to learn things you were never expecting."Not since records began has the region of the North Pacific Ocean been so warm for so long. The warm expanse has been characterized by sea surface temperatures as much as three degrees C (about 5.4 degrees F) higher than average, lasting for months, and appears on large- scale temperature maps as a red-orange mass of warm water many hundreds of miles across. Nick Bond of the Joint Institute for the Study of the Atmosphere and Ocean at the University of Washington earlier this summer nicknamed it "the blob."Indeed, there are three warm zones, said Nate Mantua, leader of the landscape ecology team at the Southwest Fisheries Science Center: The big blob dominating the Gulf of Alaska, a more recent expanse of exceptionally warm water in the Bering Sea and one that emerged off Southern California earlier this year. One exception to the warmth is a narrow strip of cold water along the Pacific Northwest Coast fed by upwelling from the deep ocean.The situation does not match recognized patterns in ocean conditions such as El Niño Southern Oscillation or Pacific Decadal Oscillation, which are known to affect marine food webs. "It's a strange and mixed bag out there," Mantua said.One possibility is that the PDO, a long-lived El Niño-like pattern, is shifting from an extended cold period dating to the late 1990s to a warm phase, said Toby Garfield, director of the Environmental Research Division at the Southwest Fisheries Science Center. Mantua said the PDO may have tipped into a warm state as early as January of this year.But both scientists noted that the observed warm temperatures are higher and cover more of the northern Pacific than the PDO typically affects. For all but the Gulf of Alaska, the warm waters appear to lie in a relatively shallow layer near the surface. The cold near-shore conditions in the Pacific Northwest also don't match the typical PDO pattern.Warm ocean temperatures favor some species but not others. For instance, sardines and albacore tuna often thrive in warmer conditions. Pacific Coast salmon and steelhead rely on cold-water nutrients, which they may have found recently in the narrow margin of cold water along the Northwest coast. But if the warmth continues or expands Pacific Northwest salmon and steelhead could suffer in coming years."If the warming persists for the whole summer and fall, some of the critters that do well in a colder, more productive ocean could suffer reduced growth, poor reproductive success and population declines," Mantua said. "This has happened to marine mammals, sea birds and Pacific salmon in the past. At the same time, species that do well in warmer conditions may experience increased growth, survival and abundance."Peterson recently advised the Northwest Power and Conservation Council that juvenile salmon and steelhead migrating from the Columbia River to the ocean this year and next may experience poor survival."The signs for salmon aren't good based on our experience in the past," Peterson said, "but we won't really see the signal from this until those fish return in a few years." The warm expanse in the Gulf of Alaska is a kind of climatic "hangover" from the same persistent atmospheric ridge of high pressure believed to have contributed to California's extreme drought, Bond and Mantua said. The ridge suppressed storms and winds that commonly stir and cool the sea surface.Other factors created the patch of warm water hugging the Central California Coast south to Baja California. A low-pressure trough between California and Hawaii weakened the winds that typically drive upwelling of deep, cold water along the California Coast. Without those winds waters off Southern California's beaches have stayed unusually warm.NOAA surveys off California in July found jellyfish called "sea nettles" and ocean sunfish, which the warmer waters likely carried closer to shore, Mantua said. Anglers have reported excellent fishing for warm water species including yellowfin tuna, yellowtail and dorado, also known as mahi-mahi.Research surveys in the Gulf of Alaska this summer came across species such as pomfret, ocean sunfish, blue shark and thresher shark often associated with warmer water, said Joe Orsi of the Alaska Fisheries Science Center Auke Bay Laboratories in Juneau. He said temperatures in the upper 20 meters of water up to 65 kilometers offshore were 0.8 degrees C (about 1.4 degrees F) above normal in both June and July.The potential arrival of El Niño later this year would likely reinforce the warming and its effects on marine ecosystems, Bond said. NOAA's National Weather Service estimates a 65 percent chance El Niño will emerge in fall or early winter.Mantua noted that fall in California generally brings even weaker winds and weaker upwelling, making it likely that the warm waters off Central California will persist and even expand northward regardless of a tropical El Niño.
Unusually warm temperatures dominate three areas of the North Pacific: the Bering Sea, Gulf of Alaska and an area off Southern California. The darker the red, the further above average the sea surface temperature. NOAA researchers are tracking the temperatures and their implications for marine life.
NOAA research surveys in the Gulf of Alaska this summer turned up ocean sunfish, also known as mola, which are often associated with warmer waters.
Thresher sharks were among the species associated with warmer waters that turned up in research surveys in the Gulf of Alaska this summer.
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Eating fish could lower your risk of hearing loss: study
All it takes is two or more servings per week, and it doesn't matter what kind you consume. The omega-3 fats in fish help preserve hearing, it seems.
According to researchers at Brigham and Women's Hospital in Boston, two or more servings of fish per week could lower women's risk of acquired hearing loss."Consumption of any type of fish (tuna, dark fish, light fish, or shellfish) tended to be associated with lower risk," says corresponding author Dr. Sharon G. Curhan, MD, of BWH Channing Division of Network Medicine. "These findings suggest that diet may be important in the prevention of acquired hearing loss."In the massive cohort study, researchers tracked a total 65,215 women from 1991 to 2009.Overall, participants self-reported 11,606 cases of incident hearing loss, and data analysis indicates that the women who consumed fish at least twice per week showed a 20% lower risk of hearing loss than the women who seldom ate fish.Case-by-case observation revealed that higher consumption of each of the aforementioned fish types and increased intake of long-chain omega-3 polyunsaturated fatty acids (PUFA) in the women's diets showed benefits for hearing preservation."Acquired hearing loss is a highly prevalent and often disabling chronic health condition," says Dr. Curhan. "Although a decline in hearing is often considered an inevitable aspect of aging, the identification of several potentially modifiable risk factors has provided new insight into possibilities for prevention or delay of acquired hearing loss."The study was published in the journal American Journal of Clinical Nutrition.
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UN warns on ocean acidification as GHG levels soar
Carbon dioxide emissions in 2013 were largest on record since 1984, says World Meteorological Organization
Shellfish are vulnerable to acidification, as acid in waters prevents species developing calcium shells (Pic: NOAA)
By Ed KingCurrent levels of ocean acidification are “unprecedented” and directly linked to rising emissions of carbon dioxide, according to the UN’s World Meteorological Organization (WMO). In a greenhouse gas analysis of 2013, released on Tuesday, it said concentrations of CO2 in the air had risen more than any other year since 1984. Methane and nitrous oxide levels also rose.Carbon dioxide levels in the atmosphere are now 142% higher than 1750, before the industrial revolution.And the WMO said data showed the warming effect on the world’s climate due to greenhouse gases, known as radiative forcing, had risen 34% between 1990 and 2013.“Carbon dioxide remains in the atmosphere for many hundreds of years and in the ocean for even longer,” said WMO secretary general Michel Jarraud.“Past, present and future CO2 emissions will have a cumulative impact on both global warming and ocean acidification. The laws of physics are non-negotiable.”Jarraud added the latest data should be used as a “scientific base for decision-making”.World leaders are primed to meet in New York in two weeks for a UN summit to discuss options to reduce emissions of climate warming gases.This report is the latest evidence of the levels of atmospheric gases burning fossil fuels has released.A leaked draft of the UN’s IPCC climate science panel syntheses report, due out in November, stressed that “human influence on the climate system is clear”.
Earlier this year the Mauna Loa observatory in Hawaii recorded for the first time in recorded history that concentrations of carbon dioxide in the atmosphere had passed 400 parts per million (ppm).Report: Alaska fisheries hit by rising acidifiction levelsEqually concerning, WMO scientists said the ability of the biosphere to absorb rising carbon levels had diminished, leaving the oceans to compensate.“The ocean cushions the increase in CO2 that would otherwise occur in the atmosphere, but with far-reaching impacts,” it said in a press release.“The current rate of ocean acidification appears unprecedented at least over the last 300 million years, according to an analysis in the report.”Caused when the oceans suck in CO2, acidification is likely to lead to the decline of corals, algae, molluscs and some plankton, say scientists.The ocean currently absorbs around a fourth of manmade CO2 emissions. The WMO said if emissions continue to rise, acidification is likely to accelerate until the 2050s.Earlier this year the IPCC said ocean warming and acidification linked to rising CO2 levels would undermine food production and threaten the world’s poorest people.Wendy Watson-Wright, executive secretary of the Intergovernmental Oceanographic Commission of UNESCO welcomed the WMO’s focus on oceans in its report.“The inclusion of a section on ocean acidification in this issue of WMO’s greenhouse gas bulletin is appropriate and needed,” she said.“It is high time the ocean, as the primary driver of the planet’s climate and attenuator of climate change, becomes a central part of climate change discussions.”
Read the original post at www.rtc.org:http://www.rtcc.org/2014/09/09/un-warns-on-ocean-acidification-as-ghg-levels-soar/
INNOVATIVE LAB GAUGES ACIDIFICATION EFFECTS ON MARINE SNAILS
Michael Maher working at the NOAA Northwest Fisheries Science Center Mukilteo field station with Mobile Ocean Acidification Treatment Systems (MOATS). Credit: NOAA NWFSC
Carbon dioxide scrubbers like those that clean the air in space stations.Precision monitors and instruments.Industrial parts used in wastewater treatment.Michael Maher’s job was to assemble the pieces into one of the most sophisticated ocean acidification simulation systems yet developed. Ocean acidification is the decrease in ocean pH due to its absorption of carbon dioxide from the atmosphere – carbon dioxide forms an acid when it dissolves in water.“You have tools available – they may not be designed for this purpose but you can try to make them all work together,” said Maher, a research biologist at NOAA Fisheries’ Northwest Fisheries Science Center in Seattle. “There wasn’t a blueprint or a kit you could order because nobody had really been trying to do this kind of thing before.”The system that Maher and the ocean acidification research team built in the Science Center’s parking lot has provided new insight into the impacts of future ocean conditions on marine species. Researchers used it to examine what happens to small marine snails from Puget Sound when exposed to both current ocean conditions and the acidified conditions expected in the future. The research is described in a new paper in the online journal PLOS ONE reporting that current West Coast ocean waters are acidified enough to dissolve the shells of the snails, called pteropods.The finding is not a surprise: Another NOAA-led team reported in April that shells of pteropods in near-shore habitat on the West Coast show signs of dissolution due to acidified waters. What is important about the new research is that it measured the extent of shell damage at escalating carbon dioxide concentrations, each translating to a different degree of acidification, in a controlled laboratory environment said Shallin Busch, a NOAA research ecologist.The findings are a first step toward using the pteropod species examined in the study as a living barometer or indicator of ocean acidification along the West Coast.“Our findings are a piece of the puzzle,” said Busch, the lead author of the new paper. “Now we know, yes, pteropods from the North Pacific are sensitive to ocean acidification. Now that we have confirmed their sensitivity, we need to look more closely at how pteropods are responding to current ocean conditions and what may happen in the future as carbon dioxide increases.”Pteropods provide important nutrition for whales, seabirds and fish such as herring, salmon and mackerel, so changes in their populations could rattle through the marine food chain. Carbon emissions during the industrial era have lowered the average global ocean pH from 8.2 to 8.1, turning oceans slightly more acidic. West Coast waters are naturally acidified compared to other parts of the ocean so they may affect marine life such as pteropods sooner than acidifying waters elsewhere in the world.The research also demonstrated the capacity of the NWFSC’s ocean acidification system to hold marine life at different carbon dioxide concentrations for extended periods. The system can control temperatures, oxygen levels and light for even more precise management of conditions during experiments.“They are all dependent on each other – if you change the temperature, the pH will change,” Maher said. The system that carefully manages all the variables is “ a combination of machines and precisions instruments.”The comprehensive controls allow researchers to isolate acidification as the cause of the shell damage, ruling out other factors that might otherwise be at play in a natural environment.“There are not a lot of cases where we can definitively say, ‘This change is the result of acidification,’” said research ecologist Paul McElhany, Busch’s colleague at NWFSC. “It’s very hard to disentangle unless you know that’s the only thing changing. Experiments like this provide evidence about the effects of acidification alone.”Busch said each member of the research team – Maher, McElhany and NOAA Hollings Scholar Patricia Thibodeau – brought individual skills to the research. The team has also developed a smaller and transportable version called a Mobile Ocean Acidification Treatment System, or MOATS that could be carried in the field or aboard research ships.Thibodeau joined the research team for the summer of 2012 after her junior year at Bowdoin College in Maine. One of her initial tasks was to collect pteropods from Puget Sound by boat at night to stock the experimental system. Pteropods ascend in the water column at night to feed. The vertical movement naturally exposes them to varying carbon dioxide concentrations, which the ocean acidification system can simulate.Later Thibodeau helped examine the shells of pteropods exposed to different concentrations of carbon dioxide. As with most science experiments where objectivity is paramount, she did not know which ones had been exposed to which concentrations when she rated the extent of damage to each shell.“Sometimes biology can be so unpredictable, but this had such a clear outcome and relationship, it was very interesting to be a part of,” said Thibodeau, who just began work on her PhD at the Virginia Institute of Marine Science. “There is definitely a human component to the issue because so many of us eat oysters and clams and other species affected by ocean acidification. So what we know and what we do really makes a difference.”
NOAA Hollings Scholar, Patricia Thibodeau collects seawater from Puget Sound for chemistry measurement. Credit: NOAA NWFSC
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