HOME >> BIOLOGY >> NEWS
Dartmouth biologists say algae might be missing mercury link in aquatic food chain

HANOVER, N.H. A team of Dartmouth researchers is one step closer to understanding how toxic metals, specifically methylmercury, move through the aquatic food chain. Their results, to be published in the April 2, 2002, issue of the Proceedings of the National Academy of Sciences (available online March 19), suggest that there is a link between the amount of algae in the water and the amount of mercury going up the food chain, and their findings may help explain why levels of mercury in the water dont always indicate corresponding levels in fish.

In a controlled experiment, the researchers followed mercury as it moved from the water, was taken up by algae, and eventually found its way into small animals called Daphnia, which eat the algae. Daphnia, a type of zooplankton, is in turn a food source for many species of fish.

While not toxic to the Daphnia or the fish at the levels found normally in nature, methylmercury biomagnification presents a serious health hazard for humans and other animals that eat the fish. Under biomagnification, there is a systematic increase in the concentration of elements, found in tissue of organisms, as they move up the food chain.

The study finds that when there is a lot of algae present, methylmercury is dispersed widely throughout the single-celled algae. As a result, Daphnia that eat the algae arent exposed to high levels of mercury. However, in systems with less algae, the mercury is more concentrated on each plant cell, so the Daphnia eat more mercury with each meal.

"Now we understand more fully the connection between mercury in the water and mercury in fish," said Paul Pickhardt, senior author on the paper, and a graduate student at Dartmouth. "We suspected there was an algal link, but few laboratories had the technology to make such precise measurements before. With our trace-metal techniques, weve achieved mercury detection levels that are 50 times more sensitive than any other method."


'"/>

Contact: Sue Knapp
sue.knapp@dartmouth.edu
603-646-3661
Dartmouth College
18-Mar-2002


Page: 1 2 3

Related biology news :

1. Dartmouth Medical School awarded $9 million grant for genomics research
2. Dartmouth study advances prion disease research
3. Dartmouth bioengineers develop humanized yeast
4. Dartmouth researchers find two circadian clocks in the same plant tissue
5. Dartmouth engineers closer to mass-producing therapeutic proteins
6. Arsenic in drinking water may be linked to cancer Dartmouth study finds
7. Dartmouth researchers put recycling in perspective
8. Dartmouth Medical School geneticists discover new role for antisense RNA
9. Dartmouth researchers identify multi-tasking circadian protein
10. New way found to see light through novel protein identified by Dartmouth geneticists
11. Cancer killing gene found by Dartmouth researchers

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/27/2021)... ... March 25, 2021 , ... Phlexglobal announced ... Planet Group, has selected Phlexglobal and its innovative regulatory SaaS software, PhlexSubmission, as ... a comprehensive review of five regulatory software companies, with the review team including ...
(Date:3/27/2021)... ... 25, 2021 , ... The 2021 Virtual Conference on Clinical Trial Supply-Europe ... More and more, clinical trial supply conferences are featuring speakers and forums that ... Asymmetrex’s founder and CEO, James L. Sherley, M.D., Ph.D., presented a talk ...
(Date:3/23/2021)... ... March 23, 2021 , ... G-CON Manufacturing (G-CON), the ... by Matica Biotechnology (Matica Bio), a contract development and manufacturing organization (CDMO) specializing ... the cleanroom build out for its new GMP production facility in College Station, ...
Breaking Biology News(10 mins):
(Date:3/27/2021)... ... March 24, 2021 , ... ... Life Sciences and Healthcare firms of all sizes, adds depth to its team ... specialist. Pardillo, who earned his doctorate in computational chemistry from Florida International University ...
(Date:3/27/2021)... ... March 24, 2021 , ... ABI Wellness, ... and reporting approach designed under CEO Mark Watson, today announced a webinar dedicated ... featuring guest speakers Dr. Cameron Clark, Neuropsychologist and Founder of Sharp Thinking, and ...
(Date:3/27/2021)... ... ... The Xtalks editorial team is pleased to announce the launch of the ... joined by editorial team members Ayesha Rashid, Sydney Perelmutter and Mira Nabulsi to discuss ... including insights from industry experts. , The Xtalks Life Science podcast will feature ...
(Date:3/23/2021)... Conn. (PRWEB) , ... March 23, 2021 , ... ... develops solutions for characterizing microbiome populations down to the strain level, recently unveiled ... applications. , Not all microbes are created equal: some are easy to ...
Breaking Biology Technology:
Cached News: