|By PR Newswire||
|March 21, 2014 03:19 PM EDT||
WELLESLEY, Mass., March 21, 2014 /PRNewswire-USNewswire/ -- March 21 marks World Water Day--and a fitting time to consider one of the most unique mammals in the Earth's waters.
The nerpa, also known as the Baikal seal, is the only seal that lives exclusively in fresh water. This earless seal can be found in just one place, Russia's Lake Baikal, where it is at the top of the food web. And now, Wellesley scientists have found that the teeth of this particular seal may hold the strongest evidence of the effects of decades of environmental pollution, nuclear testing, and climate change on Lake Baikal--the deepest, oldest, and most bio-diverse lake in the world.
"The Baikal seal teeth are a chemical record of the lake," said Marianne Moore, Wellesley Professor of Biological Sciences. By analyzing the chemical composition of hundreds of seal teeth, Professor Moore and her co-researchers, post-doctoral fellow Ted Ozersky and Wellesley student Xiu Ying (Annie) Deng '15, are working to reconstruct the Baikal seal's diet and contaminant burdens over the last 80 years. The teeth were collected from ice harvested in the area by fellow scientists in Russia.
Baikal seals can live up to 40 and 50 years, and much like the rings of a tree trunk, the layers of dentine within their teeth can be studied and linked to environmental patterns and changes over a period of time. Moore, Ozersky, and Deng are looking for evidence of toxic metals such as uranium, mercury, cadmium, and zinc inside the teeth samples, which date back to the period before industrialization in the region.
Why not just measure these toxic elements in the water? Professor Moore explained that these metals show up at extremely low levels in the water. The teeth of the nerpa are actually better indicators due to biomagnification, the process by which the concentration of a substance increases with each level of the food chain. Because the Baikal seal is at the top of its food web, their teeth hold the best clues into the lake's environmental past.
"Ultimately, the goal of our project is to study contamination levels in Lake Baikal as reflected by the seals, and to tie these patterns to changes in the watershed, such as the introduction of mining in the area, an increase in coal burning, and other environmental events," said Dr. Ozersky.
Still early in the project, the Wellesley researchers have already made a surprising discovery: levels of some toxic metals such as uranium were higher in the mid 1970's than in seals today. This suggests improving environmental conditions in the region. High levels of uranium in the mid 1970's may represent the legacy of atmospheric nuclear testing that ended in 1980 in Asia.
This news release was issued on behalf of Newswise™. For more information, visit http://www.newswise.com.
SOURCE Wellesley College
Jul. 1, 2015 07:15 PM EDT Reads: 2,520
Jul. 1, 2015 05:00 PM EDT Reads: 867
Jul. 1, 2015 05:00 PM EDT Reads: 2,226
Jul. 1, 2015 04:09 PM EDT Reads: 618
Jul. 1, 2015 03:30 PM EDT Reads: 1,078
Jul. 1, 2015 03:00 PM EDT Reads: 1,952
Jul. 1, 2015 02:45 PM EDT Reads: 1,086
Jul. 1, 2015 02:30 PM EDT Reads: 1,198
Jul. 1, 2015 02:21 PM EDT Reads: 663
Jul. 1, 2015 01:15 PM EDT Reads: 2,172
Jul. 1, 2015 12:54 PM EDT Reads: 631
Jul. 1, 2015 12:15 PM EDT Reads: 2,059
Jul. 1, 2015 12:00 PM EDT Reads: 2,015
Jul. 1, 2015 11:45 AM EDT Reads: 1,035
To many people, IoT is a buzzword whose value is not understood. Many people think IoT is all about wearables and home automation. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed some incredible game-changing use cases and how they are transforming industries like agriculture, manufacturing, health care, and smart cities. He will discuss cool technologies like smart dust, robotics, smart labels, and much more. Prepare...
Jul. 1, 2015 11:30 AM EDT Reads: 803