Navigation Links
A study proposes a new universal rule to explain the equilibrium of plant populations
Date:9/18/2007

A study financed by the BBVA Foundation and conducted by scientists Carlos Duarte, Nuria Agust and Nuria Marb from the Mediterranean Institute for Advanced Studies (CSIC University of the Balearic Islands) has allowed the first-time formulation of a universal rule that explains the equilibrium of plant communities, showing how plants assure the survival of their species whether their lives last a day or are prolonged over centuries.

The research project, whose results will appear in the next issue of the U.S. journal Proceedings of the National Academy of Science, also concludes that the life span of these organisms may be sensitive to rises in temperature. According to the authors predictions, the mortality of plants could increase by 40% if land temperatures rise by up to 4C (the rate of increase projected for the 21st century by climate change prediction models).

The reasons why organisms cease functioning and die is still one of the big questions for science. Some trees live for centuries while the smallest herbs last no more than a few months. However, there is no real reason why herbs should not, in theory, live as long as trees, given that all photosynthetic organisms plants can live indefinitely in the absence of disturbances.

The authors of the BBVA Foundation study examined the mortality and population growth rates of 700 phototrophs, ranging from the very smallest the cells of the marine photosynthetic cyanobacteria Prochloroccocus (just half a micrometer across yet responsible for a considerable fraction of marine photosynthesis) up to the largest species of trees, in search of general rules conducive to an improved understanding of plant life span regulation.

The results of the study identify phytoplankton as the shortest lived beings, with a span of around one day, while some trees reach ages of a thousand years. This was possible thanks to a methodology developed by Susana Agust, using techniques that have permitted the first ever quantification of the cell death of phytoplankton.

The authors show that the same basic rules govern the longevity and birth rates of plants, such that the brief life span of the microscopic phytoplankton cells is offset by the vertiginous birth rates of populations, while centennial tree populations register no more than sporadic births.

Their findings provide the key to a universal regulation of the life span of photosynthetic organisms with reference to plant size and the temperatures they grow at, and suggest that the mortality rates of phototrophs evolve to match population growth rates. A further conclusion is that plant mortality is of necessity highly temperature-sensitive, such that climate change will tend to accelerate the phototroph death rates which are an essential part of the food chain. As stated, the authors estimate that plant mortality could increase by 40% in the event of an up to 4C increase in land temperatures (the rate foreseen for the 21st century by most climate change prediction models).

The balance between longevity and birth rates in photosynthetic organisms is what keeps their populations stable. In the event of a serious mismatch between plant mortality and birth rates, these populations would either be driven to extinction (if death rates far exceeded births) or would outgrow available resources of light, water and food with the same inevitable result (in the case of births far exceeding deaths).


'/>"/>

Contact: Javier Fernndez
comunicacion@fbbva.es
Fundaci n BBVA
Source:Eurekalert

Related biology news :

1. Bioartificial kidney under study at MCG
2. Novel Asthma Study Shows Multiple Genetic Input Required; Single-gene Solution Shot Down
3. W.M. Keck Foundation funds study of friendly microbes
4. Yellowstone microbes fueled by hydrogen, according to U. of Colorado study
5. Emory Study Tests Bone Marrow Stem Cells to Improve Circulation in Legs
6. UCLA Study Shows One-Third of Drug Ads in Medical Journals Do Not Contain References Supporting Medical Claims
7. Study Demonstrates Gene Expression Microarrays are Comparable and Reproducible
8. Study Links Ebola Outbreaks To Animal Carcasses
9. Genome-wide mouse study yields link to human leukemia
10. Breakthrough Microarray-based Technology for the Study of Cancer
11. NYU Study Reveals How Brains Immune System Fights Viral Encephalitis
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/20/2017)... (NYSE: DAL ) customers now can use fingerprints instead of ... Airport (DCA). ... Delta launches biometrics to board aircraft at Reagan Washington National Airport ... Delta,s biometric boarding pass experience that launched in May ... boarding process to allow eligible Delta SkyMiles Members who are enrolled in ...
(Date:5/16/2017)... 2017  Veratad Technologies, LLC ( www.veratad.com ), an ... identity verification solutions, announced today they will participate as ... 15 thru May 17, 2017, in Washington ... Center. Identity impacts the lives of ... quickly evolving digital world, defining identity is critical to ...
(Date:4/18/2017)...  Socionext Inc., a global expert in SoC-based imaging and computing ... M820, which features the company,s hybrid codec technology. A demonstration utilizing ... Inc., will be showcased during the upcoming Medtec Japan at Tokyo ... Las Vegas Convention Center April 24-27. ... Click here for an image ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... The CRISPR-Cas9 ... enabling overexpression experiments and avoiding the use of exogenous expression plasmids. The simplicity ... for performing systematic gain-of-function studies. , This complement to loss-of-function studies, such ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... will be hosting a Webinar titled, “Pathology is going digital. Is your lab ... digital pathology adoption best practices and how Proscia improves lab economics and realizes ...
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions are ... 5.5 million people each year. Especially those living in larger cities are affected by ... in one of the most pollution-affected countries globally - decided to take action. , ...
(Date:10/10/2017)... ... 2017 , ... San Diego-based team building and cooking events company, Lajollacooks4u, has ... The bold new look is part of a transformation to increase awareness, appeal to ... period. , It will also expand its service offering from its signature gourmet cooking ...
Breaking Biology Technology: