Navigation Links
Edge density key to controlling gypsy moth spread

Controlling population peaks on the edges of the gypsy moth range may help to slow their invasion into virgin territory, according to a team of researchers.

"Slowing the spread of the gypsy moth is a priority in forest management in the U.S.," says Ottar Bjornstad, associate professor of entomology and biology, Penn State. "Understanding the underlying patterns in the spread of invasive species is important for successful management."

The accidental release of the gypsy moth in 1869 in Massachusetts has led to an infestation covering more than 386,000 square miles of the U.S. Northeast. Native to Europe and Asia, gypsy moths are currently found from Maine to North Carolina and west into Wisconsin where they defoliate trees and occasionally, cause extensive damage to northern deciduous forests.

"We analyzed historical data on the spread of the gypsy moth in the U.S. and found that its invasion has been characterized by regular periods of rapid spread interspersed between periods of little expansion," says Bjornstad. "This is the first identification of pulsed invasions for an invading species."

Bjornstad; Derek M. Johnson, Department of Biology, University of Louisiana, and Andrew M. Liebhold and Patrick C. Tobin, U.S. Forest Service, used historical, county-level quarantine records as well as forest service data from more than 100,000 pheromone traps set along the expanding gypsy moth population front for their theoretical model. The pheromone trap data were collected from 1988 to 2004.

They used a theoretical model to show how an interaction between negative population growth at low densities ?"the Allee effect" ?and the existence of a few satellite seed colonies created by human transfer of the insects over long distances, explain the invasion pulses, the researchers explain today (Nov. 16) in Nature. The gypsy moth adult is flightless and usually only spreads a short distance beyond infestation boundaries. External c olonies occur when moths hitch a ride on vehicles or other items relocated by people. Without an Allee effect, these colonies would establish, but because gypsy moths exhibit an Allee effect, the low populations are insufficient for establishment of permanent populations.

This is also true at the edges of the population area. If the population density is low, the Allee effect prevents growth across the boundaries. The model showed that no pulsed expansion exists for populations unaffected by the Allee effect. However, when the it is a factor, not only does pulsed expansion occur, but it mimics the historic pulses of the gypsy moth population from 1960 to 2002 found in the quarantine records.

Currently, the containment program for gypsy moths aims at controlling outbreaks outside the current population boundaries. The researchers suggest that "the invasion might also be slowed by suppressing outbreaks near the invasion front (within the populated area), to reduce the number of dispersers to below the donor threshold." This would decrease edge populations and prevent the periodic surges of growth that expand the territory.

Other invading species may also exhibit pulsed spreading. If researchers can determine that the Allee effect is in place, than this same plan of containment might aid in controlling a variety of pests.


'"/>

Source:Penn State


Related biology news :

1. Census of Marine Life explorers surprised by diversity, density of Arctic creatures
2. Scientists find that protein controls aging by controlling insulin
3. Gene controlling circadian rhythms linked to drug addiction
4. Enzyme affects hypertension by controlling salt levels in body
5. Liquid crystals show promise in controlling embryonic stem cells
6. Important gene controlling tree growth and development found
7. Key gene controlling eye lens development identified
8. Electronic chip, interacting with the brain, modifies pathways for controlling movement
9. Key gene controlling kidney development found
10. New understanding of cell movement may yield ways to brake cancers spread
11. Mosquito study shows new, faster way West Nile can spread
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/13/2017)... -- Former 9/11 Commission border counsel and Special Counsel ... of Identity Strategy Partners, LLP, today releases the ... Order: Protecting the Nation From Foreign Terrorist Entry Into ... President Trump,s ,Travel Ban, Executive Order gains more notoriety ... travel ban, it is important that our national discourse ...
(Date:2/8/2017)... Mass., Feb. 7, 2017  Aware, Inc. (NASDAQ: ... today reported financial results for its quarter and year ended ... quarter of 2016 was $3.9 million compared to $6.9 million ... fourth quarter of 2016 was $0.6 million compared to $2.6 ... the fourth quarter of 2016 was $0.5 million, or $0.02 ...
(Date:2/7/2017)... MINNETONKA, Minn. , Feb. 7, 2017   ... that supports the entire spectrum of clinical research, is ... iMedNet , its innovative, highly flexible and ... iMedNet customers. iMedNet is a ... only provides Electronic Data Capture (EDC), but also delivers ...
Breaking Biology News(10 mins):
(Date:2/16/2017)... ... February 16, 2017 , ... Avomeen & MichBio will be hosting a ... held at Avomeen Analytical Services (4840 Venture Dr., Ann Arbor, Michigan 48108). BioMixers ... an opportunity to interact with peers, make new connections and talk bio biz. , ...
(Date:2/16/2017)...  ArmaGen, Inc., a privately held biotechnology company ... neurological disorders, today reported preliminary evidence of cognitive ... investigational therapy for the treatment of Hurler and ... or MPS I). The initial results from an ... at the 13 th annual WORLD Symposium ...
(Date:2/16/2017)... , February 16, 2017 ... infusion of innovative telemedicine application, new and leading ... are experiencing a boom worldwide. The healthcare sector ... of technologies, services and new therapies for companies ... (TSX-V: RHT), Cellectar Biosciences, Inc. (NASDAQ: ...
(Date:2/16/2017)... ... February 16, 2017 , ... AxioMed announced ... professor and Harvard trained surgeon, completed the procedure on Monday, Jan. 30 at ... practicing female physician suffering from degenerative disc disease with radiculomyelopathy, as a result ...
Breaking Biology Technology: