HOME >> BIOLOGY >> NEWS
Cold climate produced by algae contributed to onset of multicellular life

The rise of multicellular animals about 540 million years ago was a turning point in the history of life. A group of Finnish scientists suggests a new climate-biosphere interaction mechanism for the underlying processes in a new study, which will be published on February 14, 2007 in PLoS ONE, the international, peer-reviewed, open-access, online publication from the Public Library of Science (PLoS).

The theory invokes cold, ice-containing climates as a key precursor for multicellular life. If the model turns out to be correct, one can assume that complex life might exist also around stars which are more massive and short-lived than the Sun. Since remote sensing of highly reflecting glaciers should be possible, this may help designing future astronomical observation programmes for earthlike extrasolar planets.

Multicellular life was preceded by the cold Neoproterozoic climate 600-800 million years ago which at times produced widespread glaciations. According to the new theory, the coldness was due to low carbon dioxide concentration brought about by strong algal growth in the oceans. The algal growth was maintained by the lack of grazing animals and the ability of cold seawater to mix and transport nutrients efficiently. A moderately high seawater oxygen concentration developed as a byproduct of the algal growth. This enabled diffusive breathing of primitive multicellulars which were larger than their unicellular counterparts. The ability of cold water to contain more dissolved oxygen also helped the multicellulars to thrive.

The diversification of the marine food webs introduced by multicellular predators as well as the moving and burrowing activity of animals on the seafloor contributed to a more efficient decomposition of the algae-produced organic carbon, which slowed the rate of organic carbon sequestration. This in turn increased the atmospheric carbon dioxide level and ended the severe glaciations and the reign of unicellular alga
'"/>

Contact: Pekka Janhunen
pekka.janhunen@fmi.fi
358-919-294-635
Public Library of Science
13-Feb-2007


Page: 1 2

Related biology news :

1. 1 of deep oceans most turbulent areas has big impact on climate
2. Changing climate will challenge Northeast agriculture, CU expert warns
3. New perspectives for the geosciences and climate research
4. Salty oceans provide early warning for climate change
5. Land conversion and climate threaten land birds
6. Study warns climate change and deforestation will lead to declines in global bird diversity
7. Smithsonian scientists connect climate change, origins of agriculture in Mexico
8. West African Ocean sediment core links monsoons to global climate evolution
9. Research finds evidence tropical cyclones have climate-control role
10. Experts to address farmers role in managing climate change
11. Investigating coral reefs to help understand past and future climate change

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


(Date:7/10/2020)... Va. (PRWEB) , ... July 08, 2020 , ... ... Latest on Cell and Gene Therapy Regulation, An FDAnews Webinar, Wednesday, July 22, ... need a comparability study, but what is the most effective way to complete ...
(Date:7/2/2020)... ... July 02, 2020 , ... Dutch ... the use of its revolutionary NEXTGENPCR endpoint thermocycler to test for SARS-CoV-2 ... The article, titled "Ultra-fast one-step RT-PCR protocol for the detection of SARS-CoV-2," ...
(Date:6/28/2020)... JUPITER, Fla. (PRWEB) , ... June 25, 2020 , ... ... will focus on innovations in accelerated Point of Care Testing solutions (POCT). Check local ... labs. Samples are collected at medical offices and are shipped to labs throughout the ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... July 16, 2020 , ... After research model surgery and catheter implantation, ... surgery is only the beginning of a successful study, while protecting and accessing the ... Gien, Global Head of Surgery from Envigo in a live webinar ...
(Date:7/10/2020)... BALTIMORE (PRWEB) , ... July ... ... Baltimore biotechnology company, announced today that Massachusetts Institute of Technology (MIT) has ... This broader license allows PathSensors to move into the point-of-care diagnostic market, ...
(Date:7/1/2020)... ... June 29, 2020 , ... MedShift ... 40% in 2020, despite many obstacles created as a result of COVID-19. As ... for its partnered medical practices and medical manufacturers by expanding access to device ...
(Date:6/28/2020)... ... June 25, 2020 , ... Lumeda Inc. ... cancer, today announced the company has entered a license agreement with Roswell Park ... Lumeda globally exclusive rights to Roswell Park intellectual property surrounding a novel medical ...
Breaking Biology Technology:
Cached News: