Navigation Links
Lichens function as indicators of nitrogen pollution in forests
Date:10/6/2008

Scientists have found lichens can give insight into nitrogen air pollution effects on Sierra Nevada and San Bernardino mountain ecosystems, and protecting them provides safeguards for less sensitive species.

Their findings are presented this month in the international journal Environmental Pollution and are significant because nitrogen from air pollution causes detrimental chemical and biological effects to terrestrial and aquatic ecosystems. Other harmful effects include elevated nitrate concentrations in streams and groundwater, and weakened California forests more susceptible to bark beetle infestations and fires.

The U.S. Forest Service funded the study, which included the agency's own researchers working with scientists at the University of Arizona and Spain's National Research Center for Energy, Environment and Technology.

According to the scientists, nitrogen pollution that has virtually eliminated lichen species in the Los Angeles Basin and San Bernardino Mountains is now exceeding critical loads over much of the Western Sierra Nevada as far north as Lake Tahoe. Other areas in corridors of polluted air such as the Central Valley are also exceeding nitrogen critical loads.

"Publicity surrounds the carbon cycle and its effects on the environment, but humans have altered the global nitrogen cycle to a greater degree," said Mark Fenn, a Forest Service plant pathologist and one of the study's authors. "There are now significant changes in lichen indicator groups because nitrogen critical loads are being exceeded over much of California."

Scientists involved in the research studied 24 mixed-conifer forest sites exposed to a wide range of atmospheric nitrogen deposition and monitored adverse changes in lichens, among the most sensitive biological indicators of nitrogen effects.

The result is a useful tool for determining critical loads and preventing broader impacts to forests. Protecting lichens also has inherent value because of their complex hydrological, nutrient cycling, wildlife forage and nesting material roles.

"Quantifying nitrogen critical loads helps land managers determine the point at which unacceptable impacts occur to sensitive ecosystems," Fenn said. "This helps bring air quality management that is more firmly rooted in ecosystem protection."

The United Nations' International Cooperative Program on Effects of Air Pollution on Natural Vegetation and Crops has led the largest effort to quantify nitrogen critical loads. Similar coordinated efforts do not exist in the United States. But, U.S. research in critical loads is increasing.


'/>"/>

Contact: Roland Giller
rgiller@fs.fed.us
510-559-6327
US Forest Service, Pacific Southwest Research Station
Source:Eurekalert

Related biology news :

1. Technical report explores role of lichens as bioindicators
2. Iron-moving malfunction may underlie neurodegenerative diseases, aging
3. US Air Force technology helps scientists understand plant root function
4. New insights into the regulation of PTEN tumor suppression function
5. Ikaria(R) Receives FDA Orphan Drug Designation for Inhaled Carbon Monoxide for Delayed Graft Function in Solid Organ Transplants
6. In scientific first, Einstein researchers correct decline in organ function associated with old age
7. GIANT-Coli: A novel method to quicken discovery of gene function
8. Chronic exposure to estrogen impairs some cognitive functions
9. Ikaria(R) Receives FDA Orphan Drug Designation for Inhaled Carbon Monoxide for Delayed Graft Function in Solid Organ Transplants
10. Researchers analyze how new anti-MRSA abtibiotics function
11. UCLA researchers clarify function of glucose transport molecule
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/10/2016)... --  Unisys Corporation (NYSE: UIS ) today announced ... testing its biometric identity solution at the Otay Mesa border ... identify certain non-U.S. citizens leaving the country. ... determine the efficiency and accuracy of using biometric technologies in ... until May 2016. --> the United States ...
(Date:3/9/2016)... Nigeria . Recently, ... 23,000 public service employees either did not exist with ... unlawfully.    --> Nigeria . ... than 23,000 public service employees either did not exist ... salary unlawfully.    --> DERMALOG, the biometrics ...
(Date:3/8/2016)... March 8, 2016   Valencell , the ... announced it has secured $11M in Series D ... a new venture fund being launched by UAE-based ... from existing investors TDF Ventures and WSJ Joshua ... continue its triple-digit growth and accelerate its pioneering ...
Breaking Biology News(10 mins):
(Date:4/27/2016)... ... April 27, 2016 , ... ... its Scientific Advisory Board. Dr. Lamka will assist PathSensors in expanding the use ... , PathSensors deploys the CANARY® test platform for the detection of harmful pathogens, ...
(Date:4/27/2016)... ... 2016 , ... Global Stem Cells Group and the University of ... research and development initiatives for potential stem cell protocol management for 2016 – 2020. ... executives began meeting to establish a working agenda and foster initiatives to promote stem ...
(Date:4/26/2016)... ... April 27, 2016 , ... Cameron ... LLP as an associate in the firm’s Intellectual Property practice group. , Clients ... electromechanical patent applications. He has an electrical engineering and computer engineering background, and ...
(Date:4/26/2016)... ... April 26, 2016 , ... ... announces the latest technology innovation for its Volume Pattern Generator (VPG) line of ... production of advanced photomasks as well as a solution for mid volume direct ...
Breaking Biology Technology: