As described in the July 20, 2013, issue of the journal Estuarine, Coastal and Shelf Science, the researchers tapped into a vast, yet nontraditional source of information to formulate their conclusions: An expansive catalog of fish captured and recorded in cooling water systems at five California coastal power plants.
The unique data set is derived from the tens of millions of cubic meters of water filtered at each power plant several times per year. Each fish caught by the cooling systems since 1972 was identified and counted.
The power plant data are another component in the various methods Scripps scientists employ to help science and society understand environmental issues and challenges. Scripps’s longstanding oceanographic observation programs include the California Cooperative Oceanic Fisheries Investigations (CalCOFI), the longest open-ocean observing program of its kind that has been producing vital data to decipher changes well offshore, as well as a long-standing program of daily seawater measurements off the Scripps Pier. The CalCOFI program has also shown long-term declines in plankton abundance. Such observational sources are part of a foundation for research to better understand the ocean environment and provide benefits to ocean managers, decision makers, and others.
The bulk average of fish from the early power plant recordings (1972-1983) declined by 78 percent compared with more recent years (1990-2010). The findings, according to the scientists, tend to absolve overfishing as the main culprit in the decline of these fishes because both commercial fish species as well as non-commercial fishes suffered similar population drops.
The decline centers on so-called “forage” fishes, small species such as sardines and anchovies that live close to shore and are consumed by larger predatory fish, seabirds, and marine mammals.
“Many of the species represented in this data set are rarely reported on as they are not targeted by either recreational or commercial fisheries, yet their decline was commensurate with better known species such as anchovies and sea basses,” said Miller. “Recent data collected since this analysis was completed do not change the outlook—the relatively long-term decline continues and likely contributes to the current, acute malnutrition and mortalities in California sea lions.”
“The data indicate that there has been a clear-cut and substantial decline in the abundance of these forage fish, both in the number of fish caught and in the overall biomass,” said McGowan, an emeritus research professor of oceanography at Scripps. “Factors beyond fishing such as oceanographic change appear to be involved, including temperature changes from global warming.”
McGowan says the evidence reveals clear synchronous declines across all five regions, possibly connected to ocean temperatures. Ranging from Northern San Diego County to Ventura County, the power plants include the San Onofre Nuclear Generating Station, Huntington Beach Generating Station, Redondo Beach Generating Station, El Segundo Generating Station, and Ormond Beach Generating Station.
“The data from four of the five power plants agree with one another, so it has to be a large-scale phenomenon, something other than the individual power plants,” McGowan said.
“We have found consistency between the power plant records and data compiled from other independent sources including fishing records and stock assessment models,” said Miller. “This invaluable secondary use of the power plant monitoring program provides population data to help better manage our coastal resources. It is a benefit which we have only begun to utilize.”
Monitoring was executed, in part, in fulfillment of conditions set forth in each power plant’s state-issued discharge permit. This analysis, however, examined these data in ways and to a depth well beyond their respective permit requirements. The results represent a substantial secondary use for regulated monitoring data, once the data have fulfilled their primary, permit-required purpose. Each of the power plant operators agreed to the use of their historic data and supported the monitoring program throughout. All data analyses were supported internally by MBC Applied Environmental Sciences.
Mario Aguilera | Source: Newswise
Further information: www.ucsd.edu
Further Reports about: Applied and Environmental Microbiology > Coastal Ocean Science > coastal power plants > cooling system > environmental risk > ocean temperature > power plant > Power Plant Technology > temperature change > water system
More articles from Ecology, The Environment and Conservation:
Rising Ocean Acidification Leads to Anxiety in Fish
05.12.2013 | University of California - San Diego
Turning wet biomass waste into high-value products
04.12.2013 | ttz Bremerhaven
The Light: Global study gets underway with online user survey
Light has a fundamental impact on our sense of well-being and performance. In cooperation with Zumtobel, a supplier of lighting solutions, Fraunhofer IAO has launched a global user survey of lighting quality in offices. The objective is to identify the best lighting conditions for a variety of spaces and lighting ...
Quantum entanglement, a perplexing phenomenon of quantum mechanics that Albert Einstein once referred to as “spooky action at a distance,” could be even spookier than Einstein perceived.
Physicists at the University of Washington and Stony Brook University in New York believe the phenomenon might be intrinsically linked with wormholes, hypothetical features of space-time that in popular science fiction can provide a much-faster-than-light shortcut from one part of the universe to another.
But here’s the catch: One couldn’t actually ...
A star is formed when a large cloud of gas and dust condenses and eventually becomes so dense that it collapses into a ball of gas, where the pressure heats the matter, creating a glowing gas ball – a star is born.
New research from the Niels Bohr Institute, among others, shows that a young, newly formed star in the Milky Way had such an explosive growth, that it was initially about 100 times brighter than it is now. The results are published in the scientific journal, Astrophysical Journal Letters.
The young ...
EPFL scientists have shown how to achieve a dramatic increase in the capacity of optical fibers; Their simple, innovative solution reduces the amount of space required between the pulses of light that transport data
Optical fibers carry data in the form of pulses of light over distances of thousands of miles at amazing speeds. They are one of the glories of modern telecommunications technology.
However, their capacity is limited, because the pulses of light need to be lined up one after the other in ...
NASA's Hurricane and Severe Storms Sentinel airborne mission known as HS3 wrapped up for the 2013 Atlantic Ocean hurricane season at the end of September, and had several highlights. HS3 will return to NASA’s Wallops Flight Facility in Wallops Island, Va., for the 2014 Atlantic hurricane season.
During the 2013 mission, two unmanned Global Hawks flew from Wallops for the first time. The mission highlights included studying the Saharan Air Layer, following the genesis of a tropical storm, finding a unique hybrid core or center circulation in a redeveloped storm, obtaining measurements on the strongest side of ...
05.12.2013 | Health and Medicine
05.12.2013 | Ecology, The Environment and Conservation
05.12.2013 | Information Technology
05.12.2013 | Event News
04.12.2013 | Event News
12.11.2013 | Event News