Navigation Links
Study shows climate change makes some chemicals more toxic to aquatic life

Some areas of the southern United States are suffering from the longest dry spell since 1887 and a new Baylor University study shows that could prove problematic for aquatic organisms.

The Baylor study found that drought conditions make some chemicals in the environment more toxic to fish and other aquatic life. Specifically, the study found that drought conditions exacerbate the magnitudes of the natural pH shifts in the water. This is important, the researchers said, because some contaminants in the water, such as ammonia, are more toxic to aquatic life depending on the pH level. Also, more than 75 percent of the essential drugs described by the World Health Organization and approximately one-third of modern pesticides have ionizable groups of compounds. These "weak base" compounds when dispersed in the environment can become more toxic to fish when surface pH levels are high.

The findings appear on-line in the journal Integrated Environmental Assessment and Management.

"The importance of this work is it shows that we may be underestimating or overestimating the adverse effects of some chemicals on fish," said study co-author Dr. Bryan Brooks, associate professor of environmental science and biomedical studies and director of environmental health science at Baylor. "How drought conditions, especially those influenced by climatic changes, impact fluctuations of the water's pH level is just now emerging as an area of concern in regards to making certain chemicals more toxic and more likely to accumulate in fish."

The Baylor researchers took samples at different times over the course of two years at 23 streams across the southern U.S. and measured how ecosystem production and respiration, dissolved oxygen content, the amount of phosphorus and nitrogen, and pH level changed over the course of a day. The researchers found that in the year that was one of the driest on record, the fluctuations of the water's pH level was extreme and coincided with increased toxicity to aquatic life.

"Future water scarcity associated with global climate change and altered precipitation patterns may profoundly impact in-stream flows in semiarid regions, which have direct implications for water resource management," said study co-author Dr. Ted Valenti, a former Baylor doctoral student. "Predicting the cumulative effects of climatic variability on the risk of contaminants may require a significant shift in the environmental assessment and management approaches for freshwater systems."


Contact: Matt Pene
Baylor University

Related biology news :

1. Long-term study shows effect of climate change on animal diversity
2. £2 million study to reveal workings of dementia genes
3. New study looks to define evangelicals and how they affect polling
4. CU-Boulder study suggests air quality regulations miss key pollutants
5. Researchers study acoustic communication in deep-sea fish
6. Study reveals homeowner perceptions in fire-prone areas
7. Researchers study how pistachios may improve heart health
8. Study: urban black bears live fast, die young
9. New study indicates link between weight gains during pregnancy and dieting history
10. Study reveals specific gene in adolescent men with delinquent peers
11. Sweat it out: UH study examines ability of sweat patches to monitor bone loss
Post Your Comments:
(Date:10/26/2015)... ALTO, Calif. and LAS VEGAS ... Nok Nok Labs , an innovator in modern ... Alliance , today announced the launch of its latest ... first unified platform enabling organizations to use standards-based authentication ... The Nok Nok S3 Authentication Suite is ideal for ...
(Date:10/23/2015)... 23, 2015 Research and Markets ( ... Voice Recognition Biometrics Market 2015-2019" report to their ... The global voice recognition biometrics market to grow ... --> --> The report, ... based on an in-depth market analysis with inputs from ...
(Date:10/22/2015)... AWRE ), a leading supplier of biometrics software and services, ... 2015.  --> --> Revenue ... of 33% compared to $6.0 million in the same quarter last ... million, or $0.10 per diluted share, which compared to $2.6 million, ... ago.  --> --> Lower ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... -- Halozyme Therapeutics, Inc. (NASDAQ: HALO ) will be presenting ... on Wednesday, December 2 at 9:30 a.m. ET/6:30 a.m. ... will provide a corporate overview. th Annual Oppenheimer ... p.m. ET/10:00 a.m. PT . Jim Mazzola , vice ... overview. --> th Annual Oppenheimer Healthcare Conference in ...
(Date:11/24/2015)... CITY , Nov. 24, 2015 /PRNewswire/ - Aeterna ... request of IIROC on behalf of the Toronto Stock ... news release there are no corporate developments that would ... --> --> About ... . --> Aeterna Zentaris is ...
(Date:11/24/2015)... ... November 24, 2015 , ... The Academy of Model ... Group (SIG), MultiGP, also known as Multirotor Grand Prix, to represent the First–Person View ... years. Many AMA members have embraced this type of racing and several new model ...
(Date:11/24/2015)... 24, 2015 /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ: ... the remaining 11,000 post-share consolidation (or 1,100,000 pre-share ... "Series B Warrants") subject to the previously disclosed ... 23, 2015, which will result in the issuance ... to the issuance of such shares, there will ...
Breaking Biology Technology: