Navigation Links
Rapid evolution within single crop-growing season increases insect pest numbers
Date:8/15/2011

RIVERSIDE, Calif. New research by scientists at the University of California, Riverside shows that evolution genetic changes in populations over time can occur so rapidly in organisms that its impact on population numbers and other aspects of biology can be seen within just a few generations.

The research, published online Aug. 9 in Ecology Letters, the highest ranked journal in the field of ecology, can improve scientists' ability to predict the growth and spread of endangered species, invasive species, and disease epidemics.

Working on aphids, considered the world's most important crop pest, the researchers experimentally tested the impact of rapid evolution on wild populations within a single crop-growing season. To accomplish this, the researchers set up an experiment that prevented evolution by natural selection from occurring in some aphids while allowing it in others. They then compared the rate at which the non-evolving and evolving populations grew.

Each fall, aphids undergo one generation of sexual reproduction. The following spring, they begin multiple generations of asexual reproduction. During this period multiple clonal lineages compete, leading to changes in gene frequencies and mean trait values in the population in the process.

In their field experiment, the researchers compared replicated aphid populations that were non-evolving (single clone, thus genetically identical) to aphid populations that were potentially evolving (two clones genetically different from each other and with dissimilar growth rates).

As the populations grew, the researchers tested whether the mixed populations evolved. Counting aphids repeatedly, they found that clones rapidly changed in frequency, within 30 days or 4-5 aphid generations. They then tested the impact of this evolutionary change on the ecology of the aphids. They found that evolving populations grew in number up to 42 percent faster than non-evolving populations.

"This shows that even without human interference natural selection acting on aphid populations causes rapid evolution," said Martin M. Turcotte, who led the research as a graduate student in ecology, evolution and organismal biology at UC Riverside. "Even stronger effects might be expected when pesticides are in use. For decades, evolution was deemed too slow and, hence, it was not considered when studying population growth an oversight that needs to be corrected. Ignoring this evolution, as is not currently uncommon, can lead to predictions that greatly underestimate pest densities and outbreaks."

Rapid evolution could have important untested impacts in many other applied areas. For example, rapid evolution is important in fisheries where intense fishing causes fish to evolve traits that let them escape fishing nets. Antibiotic resistance and increased virulence in pathogens are examples where rapid evolution impacts human health.

The study was conducted at the University of California Motte Rimrock Reserve where the researchers collected multiple clonal lineages from a wild aphid population feeding on mustard plants. They identified clones and characterized their intrinsic per capita growth rates in a greenhouse at UCR.


'/>"/>

Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert  

Related biology news :

1. Sexually extravagant male birds age more rapidly, but try to hide it
2. New UC sensor promises rapid detection of dangerous heavy metal levels in humans
3. Rapid venom evolution in pit vipers may be defensive
4. Study Shows Sutro Biopharmas Biochemical Protein Synthesis Technology Enables Rapid Production and Scale-Up of Biopharmaceuticals
5. Plasticity of hormonal response permits rapid gene expression reprogramming
6. University of Tennessee scientist: Flowers rapid growth rate can be traced back 65 million years
7. Genome duplication encourages rapid adaptation of plants
8. Evolution can cause a rapid reduction in genome size
9. New imaging technique provides rapid, high-definition chemistry
10. In the best youth football teams, the first team players develop their bodies more rapidly
11. Research suggests HIV causes rapid aging in key infection-fighting cells
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Rapid evolution within single crop-growing season increases insect pest numbers
(Date:4/4/2017)... April 4, 2017   EyeLock LLC , a ... the United States Patent and Trademark Office (USPTO) has ... the linking of an iris image with a face ... represents the company,s 45 th issued patent. ... very timely given the multi-modal biometric capabilities that have ...
(Date:3/30/2017)... 2017 Trends, opportunities and forecast in this ... technology (fingerprint, AFIS, iris recognition, facial recognition, hand geometry, ... end use industry (government and law enforcement, commercial and ... and others), and by region ( North America ... Asia Pacific , and the Rest of the ...
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. ... have received the prestigious international IAIR Award for the most innovative ... ... Maldives Immigration ... Algeen (small picture on the right) have received the IAIR award for ...
Breaking Biology News(10 mins):
(Date:9/21/2017)... , ... September 21, 2017 , ... Lajollacooks4u welcomed the ... The organization, a worldwide society of professional women with high achievement in the ... its annual dinner. , Twelve members began with an olive oil tasting ...
(Date:9/20/2017)... ... September 20, 2017 , ... The award-winning producers behind the ... feature new innovations aimed at helping farmers solve the problem of nitrogen loss. ... Tuesdays at 8:30aET on RFD-TV. Check your local listings for more info. ...
(Date:9/20/2017)... ... September 20, 2017 , ... Diversity focused business accelerator, The Refinery , ... competition to uncover the top technology-driven, women-led startups in Boston, MA, New Haven/Hamden, CT, ... city’s entrepreneurial events going on that week – in Boston, it will be part ...
(Date:9/20/2017)... ... September 20, 2017 , ... Proscia Inc. ... , a provider of whole slide imaging solutions, are hosting a pre-conference workshop ... entitled “Successfully Deploying a Best-in-Class Strategy for Digital Pathology,” will feature Proscia CEO, ...
Breaking Biology Technology: