Navigation Links
New research links decline of endangered California delta smelt to nutrient pollution

A new study to be published in the academic journal Reviews in Fisheries Science recommends that efforts to restore the endangered California delta smelt and other declining pelagic fish should more sharply focus on reducing nutrient pollution to the species' native waters. The research indicates these fish populations would greatly benefit from reductions in the amount of nitrogen flowing into the Sacramento-San Joaquin Bay-Delta from wastewater treatment plants and balancing the ratio of nitrogen and phosphorus contained in the discharged water.

"While a great deal of emphasis has been placed on ensuring there is enough water for delta smelt, we also need to recognize that the water also has to have the right chemical balance," said Dr. Patricia Glibert of the University of Maryland Center for Environmental Science. "The research shows us that reducing the amount of nitrogen from Bay-Delta wastewater treatment plants should aid the recovery of the delta smelt population. The high nutrient loads are affecting the algae at the base of the food web, which in turn, affect the food supply for the fish. This has altered the ecology of the system over many years."

For her research, Dr. Glibert analyzed 30 years of water chemistry, river flow, plankton, fish population and effluent discharge data to determine possible linkages to the population of the delta smelt and other pelagic fish in the Bay-Delta system. The analysis reveals that declines in delta smelt population most closely coincide with effluent changes from the region's major wastewater treatment plant.

"The effect of nutrient loading on fish populations has been in debate for some time," said Dr. Glibert. "While the current rate of wastewater discharge is within established permit and nutrient criteria guidelines, the ecology appears to require environmental conditions more favorable than these guidelines. In this study, a broad-scale, long-term approach was taken to understand how nutrients are related to the food web."

"Reviews in Fisheries Science is pleased to publicly release this research prior to being published in our print edition," said journal editor Dr. Sandra E. Shumway of the University of Connecticut. "We believe this research will contribute to the regional public discussions about this issue and will have significance for other nutrient impacted coastal systems elsewhere as well."

A professor of ecology and oceanography at the University of Maryland Center for Environmental Science Horn Point Laboratory and member of the National Academy of Sciences committee examining sustainable water and environmental management in the California Bay-Delta, Dr. Glibert's research focuses on nitrogen cycling, harmful algal blooms and their relationships with the food web. In addition to this research, Glibert is conducting, or has recently completed, research projects in Chesapeake Bay, Florida Bay, the Arabian Sea, East China Sea, and Australia and she currently serves as co-Chair of the international working group on land based nutrient pollution and harmful algal blooms.

The San Francisco Estuary, which encompasses the Sacramento-San Joaquin Bay Delta, is one of the largest estuarine systems on the Pacific Coast as well as one of the largest managed and engineered water systems in the United States. It is the largest source of municipal and agricultural fresh water in California and is home to several economically important fisheries. The Bay-Delta is the subject of considerable national public awareness due to the sociopolitical and socioeconomic tension surrounding the plight of the endangered delta smelt (Hypomesus transpacificus) and the court-ordered modifications of water diversion projects to protect the species.


Contact: Christopher Conner
University of Maryland Center for Environmental Science

Related biology news :

1. Plant protection research targets cacao in developing countries
2. Are invasives bad? Not always, say Brown researchers
3. HHS Secretary Sebelius announces $1 billion in NIH Recovery Act awards for research construction
4. NYSCF receives $27 million grant from Robertson Foundation to promote stem cell research
5. New research reveals Hurricane Katrinas impact on ecological and human health
6. Cutting-edge vaccine research to be showcased at AAPS National Biotechnology Conference
7. Identifying federal research dollars for ag
8. UGA researchers use patented SERS technique to rapidly, accurately detect rotavirus strain
9. 700 international researchers gather for Great Lakes Research Conference
10. New forensics research will help identify remains of children
11. TGen researcher awarded American Cancer Society fellowship
Post Your Comments:
(Date:11/17/2015)... LIVERMORE, Calif. , Nov. 17, 2015  Vigilant ... has joined its Board of Directors. ... Vigilant,s Board after recently retiring from the partnership at ... owning 107 companies with over $140 Billion in revenue.  ... performance improvement across all the TPG companies, from 1997 ...
(Date:11/12/2015)... , Nov. 11, 2015   Growing ... reliable analytical tools has been paving the way ... qualitative determination of discrete analytes in clinical, agricultural, ... are being predominantly used in medical applications, however, ... environmental sectors due to continuous emphasis on improving ...
(Date:11/9/2015)... 9, 2015  Synaptics Inc. (NASDAQ: SYNA ), ... broader entry into the automotive market with a comprehensive ... pace of consumer electronics human interface innovation. Synaptics, industry-leading ... for the automotive industry and will be implemented in ... Europe , Japan , and ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... 25, 2015 The Global ... a professional and in-depth study on the current ... (Logo: ) , The ... including definitions, classifications, applications and industry chain structure. ... international markets including development trends, competitive landscape analysis, ...
(Date:11/24/2015)... -- Cepheid (NASDAQ: CPHD ) today announced that ... and invited investors to participate via webcast. ... 1, 2015 at 11.00 a.m. Eastern Time --> ... 1, 2015 at 11.00 a.m. Eastern Time --> ... NY      Tuesday, December 1, 2015 at 11.00 ...
(Date:11/24/2015)... , ... November 24, 2015 , ... ... of the year and one of the premier annual events for pharmaceutical manufacturing: ... from 8–11 November 2015, where ISPE hosted the largest number of attendees in ...
(Date:11/24/2015)... ... ... This fall, global software solutions leader SAP and AdVenture Capital brought together dozens ... BIG ideas to improve health and wellness in their schools. , Now, the top ... of SAP's Teen Innovator, an all-expenses paid trip to Super Bowl 50, and an ...
Breaking Biology Technology: