Navigation Links
Eutrophication makes toxic cyanobacteria more toxic
Date:12/6/2010

Continued eutrophication of the Baltic Sea, combined with an ever thinner ozone layer, is favouring the toxic cyanobacterium Nodularia spumigena, reveals research from the University of Gothenburg, Sweden.

"There are several species of cyanobacteria, or blue-green algae, that can form surface blooms in the Baltic Sea," explains Malin Mohlin from the University of Gothenburg's Department of Marine Ecology. "Which species ends up dominating a bloom depends partly on how they deal with an increased amount of UV light and a shortage of nutrients. Nodularia spumigena is most toxic when there is little nitrogen in the water but sufficient amounts of phosphorus."

As a result, wastewater treatment processes that concentrate on removing nitrogen can make cyanobacterial blooms more toxic. Wastewater therefore needs to be cleared of both nitrogen and phosphorus.

Mohlin's research shows that Nodularia spumigena can be expected to be most toxic at the beginning of a bloom in July. At that time there is generally more phosphorus than nitrogen in the water, and the cyanobacteria have not yet to float to the surface but are found deeper in the water where they have not yet been exposed to UV light.

Surface blooms of cyanobacteria, which are a type of phytoplankton, have increased in both frequency and magnitude in the Baltic Sea in recent decades, and researchers are divided on the cause. Some put it down to eutrophication an excess of nutrients in the water caused by human emissions of nitrogen and phosphorus over the past 150 years. Others have studied the Baltic Sea's bottom sediment and argue that this is a natural phenomenon that has been ongoing for more than 7,000 years and is due instead to climate variations.

Different species of nitrogen-fixing cyanobacteria bloom at different times. Aphanizomenon species tend to bloom from May to June, but from July to August the toxic species Nodularia spumigena normally dominates for as long as the surface water is warm and still.

The toxin it produces is called nodularin and is a hepatotoxin a toxin that attacks the liver. Livestock and dogs around the Baltic Sea have died after consuming large quantities of toxic water during blooms.


'/>"/>

Contact: Malin Mohlin
malin.mohlin@marecol.gu.se
46-031-786-2954
University of Gothenburg
Source:Eurekalert  

Related biology news :

1. Researchers call for nitrogen and phosphorus reductions to combat eutrophication in aquatic systems
2. MU scientist develops salmonella test that makes food safer, reduce recalls
3. Supercomputer makes it possible to develop a Brazilian Global Climate System Model
4. Humidity makes gecko feet stickier
5. Genomic haircut makes worlds tiniest genome even smaller: UBC research
6. Pitt/Iowa team finds cellular structural molecule can be toxic: Makes pneumonia worse
7. Neuronal diversity makes a difference, says Carnegie Mellon study
8. What makes a good egg and healthy embryo?
9. Selenium makes more efficient solar cells
10. Why (smart) practice makes perfect
11. New retrieval method makes studying cancer proteins easier
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Eutrophication makes toxic cyanobacteria more toxic
(Date:11/21/2016)... 21, 2016   Neurotechnology , a provider ... today announced that the MegaMatcher On Card fingerprint ... for the NIST Minutiae Interoperability Exchange (MINEX) ... mandatory steps of the evaluation protocol. ... test of fingerprint templates used to establish compliance ...
(Date:11/17/2016)... , Nov. 17, 2016  AIC announces that it has just released a ... organizations that require high-performance scale-out plus high speed data transfer storage solutions. ... ... ... Setting up a high performance ...
(Date:11/15/2016)... 15, 2016 Research and Markets has announced ... 2021" report to their offering. ... ... by 2021 from USD 6.21 Billion in 2016, growing at a ... of the bioinformatics market is driven by the growing demand for ...
Breaking Biology News(10 mins):
(Date:12/6/2016)... , Dec. 6, 2016 The American Botanical ... adoption of arnica ( Arnica montana ) through ... ABC,s HerbMedPro database, a comprehensive, interactive ... and clinical research data on the uses and ... Naturopathica, a wellness company with healing ...
(Date:12/6/2016)... ... December 06, 2016 , ... The Osteoarthritis Research Society International ... Administration (FDA) to consider OA as a serious disease. As an organization of ... population of OA patients, many of whom may experience progressive disability and decreased ...
(Date:12/6/2016)... ... December 06, 2016 , ... Symbios ... today that the company has engaged in a collaborative research partnership with Colorado ... the CSU Office of the Vice President for Research. This agreement is designed ...
(Date:12/6/2016)... , Dec. 6, 2016  Creative Medical Technology ... , MD, PhD, FANA, FAAN to the Company,s Scientific ... and clinical trials to assist the Company,s clinical development ... AmnioStem product is a universal donor stem cell derived ... in animal models of stroke 1 .  ...
Breaking Biology Technology: