Navigation Links
Twentieth-century warming in Lake Tanganyika is unprecedented
Date:5/17/2010

e lake bed to reconstruct the 1,500-year history of the lake. The scientists analyzed the cores for chemicals produced by microbes and left in the sediments to determine the lake's past temperature and productivity.

Because sediment is deposited in the lake in annual layers, the cores provide a detailed record of Lake Tanganyika's past temperatures and productivity and of the regional wildfires.

The instrument record of lake temperatures from the 20th century agrees with the temperature analyses from the cores, Cohen said.

The cores were extracted as part of the UA's Nyanza Project, a research training program that brought together U.S. and African scientists and students to study tropical lakes. The National Science Foundation funded the project.

"A big part of our mandate for the Nyanza Project was looking at the interconnectivity between climate, human activity, resources and biodiversity," said Cohen, who directed the multi-year project.

Lake Tanganyika and similar tropical lakes are divided into two general levels. Most of the fish and other organisms live in the upper 300 feet (about 100 meters). At depths below that, the lake waters contain less and less oxygen. Below approximately 600 feet, the lake water, although nutrient-rich, has no oxygen and fish cannot live there.

During the region's windy season, the winds make the lake's surface waters slosh back and forth, mixing some of the deep water with the upper layers. This annual mixing resupplies the lake's food web with nutrients and drives the lake's productivity cycle, Cohen said.

However, as Lake Tanganyika warms, the upper waters of the lake become less dense. Therefore, stronger winds are required to churn the lake waters enough to mix the deeper waters with the upper layer. As a result, the upper layers of the lake are becoming increasingly nutrient-poor, reducing the lake's productivity.

In addition, warmer water contains less d
'/>"/>

Contact: Mari N. Jensen
mnjensen@email.arizona.edu
520-626-9635
University of Arizona
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Brown geologists show unprecedented warming in Lake Tanganyika
2. NASA, Purdue study offers recipe for global warming-free industrial materials
3. CO2 effects on plants increases global warming
4. Study gives green light to plants role in global warming
5. Study gives green light to plants’ role in global warming
6. Microbes contribute less to climate warming
7. Soil microbes produce less atmospheric CO2 than expected with climate warming
8. Topography of mountains could complicate rates of global warming
9. New mathematical model helps biologists understand how coral dies in warming waters
10. Global warming threatens plant diversity
11. Global warming may hurt some poor populations, benefit others
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Twentieth-century warming in Lake Tanganyika is unprecedented
(Date:3/23/2015)... , March 23, 2015  In the 2014 fiscal ... case conviction losses. This figure accounts for a fraction ... to The Nilson Report, exceeds $11 billion globally. The ... after a crime has occurred. Investor Mark Saint ... expert Joe Paolella partnered to administer the ...
(Date:3/20/2015)... -- NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or ... growing mobile commerce market, announces its biometric payment technology, ... featured in 2015 "I Want That" International CES Special, ... the DIY Network.   DIY,s "I Want ... site of the 2015 International CES for a firsthand ...
(Date:3/17/2015)... , March 17, 2015 ... company specializing in clinical study management systems, is ... in attendance at ARENA,s Outsourcing in Clinical Trials ... This event provides an excellent forum for MedNet ... flexible and affordable software-as-a-service (SaaS) eClinical technology platform. ...
Breaking Biology News(10 mins):Polygraph Test Now Used to Protect Investors From Fraud 2Polygraph Test Now Used to Protect Investors From Fraud 3NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 2NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 3Connect With MedNet Solutions At Outsourcing In Clinical Trials Southeast 2
... PITTSBURGHCarnegie Mellon University,s John Kitchin was awarded $750,000 ... of Energy for developing new materials for producing ... was elated to hear that my research had been ... professor in Chemical Engineering at Carnegie Mellon. "This ...
... distinctive red soils could play a part in the formation ... off east coast beaches in summer., A QUT team of ... gives our iron-rich soil its red colour, reaches water to ... a foul smell, but also make our eyes sting, cause ...
... This release is available in German . ... decreased over recent decades. In fact, the number of beekeepers has ... the result of a study that has now been published by ... provided an overview of the problem of bee colony decline at ...
Cached Biology News:Carnegie Mellon's John Kitchin receives early career award 2Is iron from soil a factor in algal blooms? 2Fewer honey bee colonies and beekeepers throughout Europe 2Fewer honey bee colonies and beekeepers throughout Europe 3
(Date:4/23/2015)... 23, 2015 Six startups from ... April 4-17 as part of the U.S.-Russia Innovation ... group of biotechnology startups to participate in the ... (UNN) and the University of Maryland (UMD) signed ... their respective universities in the biomedical industry in ...
(Date:4/23/2015)... 2015  Cryoport, Inc. (OTCBB: CYRX) ("Company"), the ... the life sciences industry, today announced that the ... within the animal husbandry market by signing a ... the shipment of equine semen for artificial insemination ... Animal husbandry is a multi-billion dollar ...
(Date:4/23/2015)... Irvine, CA (PRWEB) April 23, 2015 ... research leader in Personalized Medicine, is excited to ... Medication Response profile . This profile assesses 62 ... and provide dosing information for commonly prescribed non-opioid ... gabapentin (brand name Neurontin), alprazolam (brand name Xanax) ...
(Date:4/23/2015)... ReliantHeart's HeartAssist5® Ventricular Assist Device (VAD) ... the device) in real time, and this data is ... provider of Machine to Machine (M2M) communications for the ... VADLink.com can be monitored by a patient’s ... flow below a minimum threshold, the patient can be ...
Breaking Biology Technology:U.S.-Russian Innovation Corridor Program Connects Visiting Russian Startups to U.S. Experts 2U.S.-Russian Innovation Corridor Program Connects Visiting Russian Startups to U.S. Experts 3U.S.-Russian Innovation Corridor Program Connects Visiting Russian Startups to U.S. Experts 4Cryoport to Support the Equine Animal Husbandry Market Through Agreement with Yancey Farms 2Cryoport to Support the Equine Animal Husbandry Market Through Agreement with Yancey Farms 3Proove Biosciences Launches World’s First Test to Predict Responders to Commonly Prescribed Non-Opioid Pain Medications 2Proove Biosciences Launches World’s First Test to Predict Responders to Commonly Prescribed Non-Opioid Pain Medications 3
... 3SBio Inc.,(Nasdaq: SSRX ) ("3SBio" or ... focused on researching, developing, manufacturing and,marketing biopharmaceutical ... board of directors has approved a share ... 3SBio to purchase up to US$20 million ...
... Genomas(R), a,biomedical company advancing DNA-guided medicine and ... Phase I-II Small,Business Innovation Research (SBIR) Grant totaling ... Statin Safety and Efficacy," was,awarded by the National ... are the most prescribed drugs in the world. ...
... to Attend April Meeting,in St. Louis, DANBURY, ... (SBS) today announced its outstanding roster of,keynote speakers ... be held,April 6-10 at America,s Center in St. ... and biotech industries from around the world are,expected ...
Cached Biology Technology:3SBio Inc. Approves Share Repurchase Program 2Genomas Awarded $1.2 Million NIH SBIR Grant to Develop DNA-Guided System for Management of Statin Therapy 2Society for Biomolecular Sciences Announces 2008 Conference Speaker Line-up 2
... designed for stabilizing the coating biomolecules ... immunoassay development. It can stabilize ... and drying process and for long ... works as a blocking agent to ...
... The Freedom EVO Clinical is Tecans open ... to enhance quality, safety and performance in ... Safety is provided by flexible barcode reading ... to mention that the system complies with ...
... is one of the smallest thermal cyclers on ... of either the 0.5ml (20 samples) or 0.2ml ... Fast heating and cooling rate of 3.6C/sec ... high performance Fast track programming with new ...
... cycler, flexible on your protocols, easy on your ... high sample throughput instrument at a highly affordable ... format: The truly user-friendly fully interchangeable block system ... of seconds without the need of any tools ...
Biology Products: