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:4/6/2017)... Forecasts by Product Type (EAC), ... End-Use (Transportation & Logistics, Government & Public Sector, Utilities ... Generation Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), ... you looking for a definitive report on the $27.9bn ... ...
(Date:4/5/2017)... 2017 Today HYPR Corp. , leading ... component of the HYPR platform is officially FIDO® ... security architecture that empowers biometric authentication across Fortune 500 ... secured over 15 million users across the financial services ... home product suites and physical access represent a growing ...
(Date:4/4/2017)... NEW YORK , April 4, 2017   ... solutions, today announced that the United States Patent and ... The patent broadly covers the linking of an iris ... the same transaction) and represents the company,s 45 th ... our latest patent is very timely given the multi-modal ...
Breaking Biology News(10 mins):
(Date:7/22/2018)... Md. (PRWEB) , ... July 19, 2018 , ... ... the Freedom from Cancer Startup Challenge (FCSC), generously supported by the Laura and ... to advance 100+ breakthrough inventions -- conceived and developed at 55 institutions, including ...
(Date:10/12/2017)... ... October 12, 2017 , ... The Blavatnik Family Foundation ... six Finalists of the 2017 Blavatnik Regional Awards for Young Scientists. Established ... administered by the New York Academy of Sciences to honor the excellence of ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... the first-ever genomics analysis platform specifically designed for life science researchers to ... of pioneering researcher Rosalind Franklin, who made a major contribution to the ...
(Date:10/11/2017)... BALTIMORE, Md. (PRWEB) , ... October 11, 2017 ... ... for digital pathology, announced today it will be hosting a Webinar titled, “Pathology ... of  Advanced Pathology Associates , on digital pathology adoption best practices and how ...
Breaking Biology Technology:
Cached News: