Navigation Links
Monarch butterflies help explain why parasites harm hosts
Date:5/14/2008

Athens, Ga. Its a paradox that has confounded evolutionary biologists since Charles Darwin published On the Origin of Species in 1859: Since parasites depend on their hosts for survival, why do they harm them?

A new University of Georgia and Emory University study of monarch butterflies and the microscopic parasites that hitch a ride on them finds that the parasites strike a middle ground between the benefits gained by reproducing rapidly and the costs to their hosts. The study, published in the early online edition of the journal Proceedings of the National Academy of Sciences, provides the first empirical evidence in a natural system of whats called the trade-off hypothesis.

Parasites have to harm their host to replicate and be transmitted, said lead author Jacobus de Roode, a former post-doctoral researcher at UGA and now an assistant professor at Emory University. But what this study found is that if they harm their host too much, theyll suffer too. On the other hand, this study also shows that it does not benefit the parasite to be maximally benign, because those parasites dont replicate enough to be effectively transmitted.

In a painstaking, three-year study conducted in the laboratory of Sonia Altizer, assistant professor in the UGA Odum School of Ecology, researchers infected monarch caterpillars with varying levels of spores from a protozoan parasite commonly found in wild populations. After the adult butterflies emerged, females were mated and placed in outdoor mesh cages. The butterflies spread the parasites when they deposit spores onto eggs or leaves of the milkweed plants that caterpillars feed on. These spores are then consumed by caterpillars as they feed. Each butterfly had one stalk of milkweed in its cage, and every day for up to 30 days the researchers gave the butterflies a new stalk while taking the previous stalk back to the lab for analysis. The spores on the eggs and on the milkweed were counted, which i
'/>"/>

Contact: Sam Fahmy
sfahmy@uga.edu
706-542-5361
University of Georgia
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Smell-wars between butterflies and ants
2. Genetic breakthrough explains dangerously high blood glucose levels
3. Computers explain why pears may become brown during commercial storage
4. The Uukuniemi virus helps to explain the infection mechanism of bunyaviruses
5. Private Rocketeers reach for space -- science writer in Canada to explain
6. Professors video series explains all facets of Earth
7. New research explains link between smoking and SIDS
8. Study helps explain how allergic reactions are triggered
9. Snoozing worms help Penn researchers explain the evolution of sleep
10. Bodily breakdown explained: How cell differentiation patterns suppress somatic evolution
11. Can interacting pathogens explain disease patterns?
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Monarch butterflies help explain why parasites harm hosts
(Date:10/18/2014)... 2014 Psychological stress and stress-related psychiatric disorders are ... but the molecular mechanisms underlying this relation ... to the development of targeted preventive strategies ... devastating diseases. This work is presented at ... Berlin., Now an international group of researchers ...
(Date:10/17/2014)... shown for the first time how bacteria can grow ... them the opportunity to get tremendous insights into bacteria ... also discovered the bacterial growth in chronic lung infections ... down by the immune cells. The researchers discovered the ... the bacteria, forcing the bacteria to switch to a ...
(Date:10/16/2014)... the bowel lining develops and, in the process, suggested ... The researchers produced evidence that stem cells are responsible ... feature of the bowel lining, and believe these stem ... finding as scientists are still divided on the stem ... Wee Tan and Professor Tony Burgess from the Walter ...
Breaking Biology News(10 mins):Researchers find why depression and aging linked to increased disease risk 2Scientists opens black box on bacterial growth in cystic fibrosis lung infection 2Cryptic clues drive new theory of bowel cancer development 2
... CORVALLIS, Ore. Fungi have significant potential for "horizontal" ... mechanisms that allow bacteria to evolve so quickly, become resistant ... to be published Thursday in the journal Nature , ... make-up of their genomes and become infectious to plants and ...
... like a mashup of monster movies, but palaeontologists have discovered ... a killing that took place 4 million years ago. ... by careful, forensic-style analysis of bite marks on an otherwise ... have reconstructed the events that led to the death of ...
... scientists have successfully used geometrically patterned surfaces to influence ... a departure from that of many stem-cell biologists, who ... controlling the fate of stem cells. "The cells ... it,s the shape alone that,s dictating whether they turn ...
Cached Biology News:Fungi can change quickly, pass along infectious ability 2Jaws -- 4 million B.C. 2
(Date:10/22/2014)... (PRWEB) October 21, 2014 The ... the inorganic refrigerants market in Americas with analysis ... TOC of the Americas Inorganic Refrigerants Market report, ... provided. This also provides a glimpse of the ... is supported by various tables and figures. ...
(Date:10/22/2014)... Cranford, NJ (PRWEB) October 22, 2014 ... technologies and services – has been working with a ... Health and New Haven Farms Community Farming Collaborative to ... iPad-based ePRO solution. The study, which started in ... Wellness program that provides participants weekly exposure to and ...
(Date:10/22/2014)... 22, 2014 According to new ... Service Type (Consulting, Integration, Deployment & Support), by ... Model (Public, Private, Others (Hybrid & Community)) - ... and segments the Cloud Professional Services Market into ... of revenues. It also identifies the drivers and ...
(Date:10/22/2014)... DUBLIN , Oct. 22, 2014 ... "Organic Electronics Market by Material, by Application, Geography ... report to their offering. Organic electronics, ... a branch of material science which deals with small ... as organic because small molecules and polymers are carbon ...
Breaking Biology Technology:The Americas Inorganic Refrigerants Market is estimated to grow to $71.6 million by 2018 - New Report by MicroMarket Monitor 2The Americas Inorganic Refrigerants Market is estimated to grow to $71.6 million by 2018 - New Report by MicroMarket Monitor 3myPROpad™ Topic of Panel Discussion at the Yale Food Systems Symposium 2myPROpad™ Topic of Panel Discussion at the Yale Food Systems Symposium 3Cloud Professional Services Market by Public, Private, Hybrid & Community Expected to Reach $34.41 Billion by 2019 - New Report by MarketsandMarkets 2Cloud Professional Services Market by Public, Private, Hybrid & Community Expected to Reach $34.41 Billion by 2019 - New Report by MarketsandMarkets 3Cloud Professional Services Market by Public, Private, Hybrid & Community Expected to Reach $34.41 Billion by 2019 - New Report by MarketsandMarkets 4Cloud Professional Services Market by Public, Private, Hybrid & Community Expected to Reach $34.41 Billion by 2019 - New Report by MarketsandMarkets 5Global Organic Electronics (Semiconductor, Conductive, Dielectric and Substrate) Market - Analysis and Forecast (2014 - 2020) 2Global Organic Electronics (Semiconductor, Conductive, Dielectric and Substrate) Market - Analysis and Forecast (2014 - 2020) 3
... York are pioneering the development of electron microscopes which ... materials in new revolutionary ways., The team, headed by ... University,s Department of Physics has created electron beams with ... will open the way to many novel applications including ...
... Inc. announced today the publication of key results relating ... discovery for high-value G-protein-coupled receptor (GPCR) targets in ... of a Lipid G Protein-Coupled Receptor," was co-authored by ... Ph.D., and Raymond Stevens, Ph.D. Drs. Rosen and Stevens ...
... Pa., Feb. 16, 2012  BioDelivery Sciences International, Inc. (Nasdaq: ... Trademark Office (USPTO) has issued a Notice of Allowance ... granted, will extend the exclusivity of the BioErodible MucoAdhesive ... Buprenorphine/Naloxone from 2020 to 2027.  A ...
Cached Biology Technology:York researchers create 'tornados' inside electron microscopes 2Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science 2Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science 3Receptos Scientists Publish Determination of a High Resolution Sphingosine 1-Phosphate Receptor 1 Structure in Science 4BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 2BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 3BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 4BioDelivery Sciences Receives Patent Allowance Triggering $15 Million Milestone Payment from Endo Pharmaceuticals 5