Navigation Links
Early warning signs of population collapse
Date:4/10/2013

reach a tipping point at which any small disruption could wipe out a population.

This phenomenon can be spotted quickly in yeast, which produces about 10 new generations per day, but measuring these population fluctuations for species such as fish or deer would take much more time. In hopes of finding more useful signals, the researchers turned their attention to spatial information.

There goes the neighborhood

In their new study, the researchers theorized a new type of indicator that they call "recovery length" the spatial counterpart to recovery time. This idea is based on the observation that populations living near the boundary of a less hospitable habitat are affected, because the neighboring habitats are connected by migration. Populations further away from the bad region gradually recover to equilibrium, and the spatial scale of this recovery can reveal a population's susceptibility to collapse, according to the researchers.

To test this idea, the researchers first established several linked yeast populations in a state of equilibrium. At the end of each day, a certain percentage of each population was transferred to adjacent test tubes, representing migration to adjacent regions.

The researchers then introduced a "bad" habitat, where only one in every 2,500 yeast survives from one day to the next. This reduction in population mimics what might happen in a natural population plagued by overfishing, or by a drastic reduction in its food supply.

The MIT team found that populations closest to the bad habitat had the hardest time maintaining an equilibrium state. Populations farther away maintained their equilibrium more easily.

"There's some distance you have to go away from the bad region in order to get recovery of the population density," Gore says. "How far you have to go before you reach equilibrium is the recovery length, and that tells you how close these populations are to collapse."<
'/>"/>

Contact: Sarah McDonnell
s_mcd@mit.edu
617-253-8923
Massachusetts Institute of Technology
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Brain & Behavior Research Foundation awards nearly $4 million in new NARSAD grants
2. Ocean plankton sponge up nearly twice the carbon currently assumed
3. JCI early table of contents for Mar. 15, 2013
4. More accurate, sensitive DNA test allows early identification of fungus causing WNS
5. Potential early indicator of kidney injury identified
6. Friend or foe: Babies choose sides early
7. NIH awards nearly $2 million to 3 NYC institutions for chronic fatigue syndrome research
8. Early antiretroviral treatment reduces viral reservoirs in HIV-infected teens
9. Early warning system provides 4-month forecast of malaria epidemics in northwest India
10. New model could lead to improved treatment for early stage Alzheimers
11. Prenatal DHA reduces early preterm birth, low birth weight
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... Evidence exists that cannabinoid receptor type 1 ... Ca2+ influx, and reduce neurotransmitter release. However, ... 1 can increase extracellular Ca2+ influx and ... his team, Tongji Hospital Affiliated to Tongji ... Technology, China used whole cell voltage-clamp and ...
(Date:7/11/2014)... Janeiro, Brazil- In the brains of all vertebrates, ... allows an electric or chemical signal to be ... synapses, which are the most abundant type of ... formation is crucial for learning, memory, perception and ... synapses critical for brain function. For instance, ...
(Date:7/10/2014)... NEW YORK , June 27, 2014 /PRNewswire/ ... against Provectus Biopharmaceuticals, Inc. ("Provectus" or the "Company")(NYSE-MKT: ... action, filed in United States District Court, Middle ... Division, is on behalf of a class consisting ... otherwise acquired Provectus securities between December 17, 2013 ...
Breaking Biology News(10 mins):Blame it on the astrocytes 2SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 2SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 3
... This news release is available in ... November 26, 2013 In the developing world, Cryptosporidium ... decade ago, it announced its presence in the United States, ... the county,s history. Its rapid ability to spread, combined with ...
... new study reveals how pollution causes thunderstorms to leave ... Proceedings of the National Academy of Sciences ... reveal how pollution plays into climate warming. The work ... weather and climate models. Researchers had thought that ...
... mild cognitive impairment is a transitional stage between ... networks during this transformation have yet to be ... University of Technology, China constructed brain networks using ... four populations (normal controls, patients with early mild ...
Cached Biology News:Treatment target identified for a public health risk parasite 2The lingering clouds 2The lingering clouds 3
(Date:7/11/2014)... , Not for release, publication or distribution (in whole ... to do so would constitute a violation of the relevant ... the "Company") (LSE: SHP, NASDAQ: SHPG ) notes ... a meeting with representatives of AbbVie. This statement ... approval of AbbVie. A further update will be ...
(Date:7/11/2014)... 11, 2014  Researchers have pioneered a revolutionary ... new technology, called Virtual Finger, allows scientists to ... neurons and synapses using the flat surface of ... 3D imaging studies orders of magnitude more efficient, ... level across many areas of experimental biology. The ...
(Date:7/10/2014)... Understanding the need for better quality ... the gap that currently exists in this area, ChanTest ... portfolio of validated ion channel and GPCR cell lines. ... as ion channels control many critical physiological functions throughout ... the potential to treat a variety of human diseases. ...
(Date:7/10/2014)... July 10, 2014 EvoDerma ’s NOOME ... This rejuvenating device now comes with a second treatment cup ... time. , The new cup is thinner on the edges ... to target rough, thin and uneven surfaces on the face, ... for a stimulating treatment on areas such as the cheeks ...
Breaking Biology Technology:Shire plc - Statement re: Media Speculation 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 2Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 3Introducing a New Bonus Treatment Cup for EvoDerma’s NOOME Anti-Aging Motion 2
... BEIJING , June 1 /PRNewswire-Asia-FirstCall/ -- Dehaier Medical Systems ... and,sale of medical products in China , said today that it ... anesthesia product manufactured,by Penlon, a UK firm specializing in anesthesia and breathing ... , ...
... -- Pioneer Surgical Technology, Inc. is pleased to announce that the ... study patients was presented at the recent 10th annual meeting of The ... Orleans by Domagoj Coric , M.D., Chief, Department of Neurosurgery, ... , ...
... June 1 /PRNewswire-FirstCall/ - Oncolytics Biotech Inc. ... has received approval from the Belgian Federal Agency for ... 3 trial examining REOLYSIN in combination with paclitaxel and ... This is the same trial that was agreed to ...
Cached Biology Technology:Dehaier Medical Systems Extends Product Offerings with Exclusive Distribution Agreement for Penlon Anesthesia System in North China 2Dehaier Medical Systems Extends Product Offerings with Exclusive Distribution Agreement for Penlon Anesthesia System in North China 3Dehaier Medical Systems Extends Product Offerings with Exclusive Distribution Agreement for Penlon Anesthesia System in North China 4Two-Year Follow up Data of NuBac® IDE Feasibility Study Was Presented at SAS Meeting 2Oncolytics Biotech(R) Inc. Receives Approval from Belgium FAMHP to Conduct Phase 3 Trial for REOLYSIN(R) in Head and Neck Cancers 2Oncolytics Biotech(R) Inc. Receives Approval from Belgium FAMHP to Conduct Phase 3 Trial for REOLYSIN(R) in Head and Neck Cancers 3Oncolytics Biotech(R) Inc. Receives Approval from Belgium FAMHP to Conduct Phase 3 Trial for REOLYSIN(R) in Head and Neck Cancers 4
... SizeSep 400 Spun Columns, 10. *SizeSep 400 ... > 400 base pairs in length. ... CL-4B and pre-equilibrated in distilled water containing 0.15% ... than ~ 400 base pairs. *Extremely ...
... 25 purifications. Allows rapid purification ... removal of unincorporated CyDye label and ... yields of labeled cDNA probe. ... labeled by either direct incorporation or ...
... are complete ready-to-use reagents for the isolation ... specifically formulated for the isolation of genomic ... specifically formulated for the isolation of genomic ... DNAzol Reagents can be used for restriction ...
Apoptosis Detection Systems and Reagents...
Biology Products: