Navigation Links
Hidden interactions between predators and prey: evolution causes cryptic dynamics in ecology
Date:9/3/2007

When the populations of two species oscillate together (for example, predators and prey), its a good bet that they are tightly coupled ecologically. A famous example is the Canadian lynx and snowshoe hare, documented in the trapping records of the Hudsons Bay Company. But is the opposite also true" If the preys population doesnt fluctuate while the predators does, can we assume they are not tightly linked in the food web" Among ecologists, this has generally been thought to be the case. But in a new multidisciplinary study published this week in the open-access journal PLoS Biology, Takehito Yoshida from the University of Tokyo in Japan and colleagues from the Universities of Cornell, Oregon, and Michigan in the USA have come together to show that cryptic evolutionary dynamics can link these populations.

The authors observed the dynamics of a rotifer and its food source, a unicellular alga, in a laboratory microcosm (in this case, a chemostat with an aqueous growth chamber whose nutrient supply is kept steady through a continuous in-and-out flow of medium). They were therefore able to experimentally manipulate the conditions of the two species. Under many different conditions, the pair co-oscillated and was tightly linked, just like the lynx and the hare. Yet, sometimes the rotifers population waxed and waned, while the algal population abundance remained virtually constant. Yoshida and colleagues demonstrate mathematically that this could occur when the algal population comprises more than one genotype: one type more palatable to the rotifer predator and one less so. Needing direct data to back up this finding, the researchers then turned to another pair of interacting species in a laboratory microcosm, the bacterium Escherichia coli< /span> and the phage virus T4. Despite wide swings in phage abundance, they maintained a constant bacterial population by including vulnerable and resistant strains of the bacteria. Importantly, the population of the vulnerable bacterial strain showed a typical predator-prey cycle with the phage.

The researchers call this pattern of predatorprey population changes cryptic dynamics, because the rapid evolution of the prey into different genotypes masks the strong interaction between the two species. The implications of this prediction for understanding natural communities are extensive: observations of predator and prey population dynamics cannot always be trusted to be informative about the strength or even the existence of interspecific trophic links because such cryptic evolutionary dynamics may occur in a large fraction of trophic interactions.


'/>"/>
Contact: Natalie Bouaravong
press@plos.org
415-568-3445
Public Library of Science
Source:Eurekalert

Related biology news :

1. Finding hidden invaders in a Hawaiian rain forest
2. UCLA cancer researchers shake loose hidden biomarker
3. Measuring hidden parasites in falciparum malaria
4. Envisat and ERS-2 reveal hidden side of Hurricane Rita
5. Computer modeling reveals hidden conversations within cells
6. Hidden sponges determine coral reefs nutrient cycle
7. Viagras hidden help for wildlife
8. Clues to breast cancer hidden inside stem cells
9. Squid skin reveals hidden messages
10. Hidden-hero microbes in soil, water may help naturally clean toxic sites
11. UBC researchers reveal dwarf aquatic plants hidden ancestry
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/16/2016)... 16, 2016 The global ... to reach USD 1.83 billion by 2024, according ... Inc. Technological proliferation and increasing demand in commercial ... to drive the market growth.      ... The development of advanced multimodal techniques for biometric ...
(Date:6/9/2016)... 9, 2016 Paris Police ... video security solution to ensure the safety of people and ... during the major tournament Teleste, an international technology ... services, announced today that its video security solution will be ... back up public safety across the country. The system roll-out ...
(Date:6/2/2016)... June 2, 2016 The Department of ... awarded the 44 million US Dollar project, for the ... Plates including Personalization, Enrolment, and IT Infrastructure , ... the production and implementation of Identity Management Solutions. Numerous renowned ... Decatur was selected for the most ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... -- Liquid Biotech USA , Inc. ... Research Agreement with The University of Pennsylvania ("PENN") ... patients.  The funding will be used to assess ... outcomes in cancer patients undergoing a variety of ... to support the design of a therapeutic, decision-making ...
(Date:6/24/2016)... , ... June 24, 2016 , ... Researchers at the ... commonly-identified miRNAs in people with peritoneal or pleural mesothelioma. Their findings are the subject ... it now. , Diagnostic biomarkers are signposts in the blood, lung fluid or ...
(Date:6/23/2016)... June 23, 2016 A person commits a crime, ... scene to track the criminal down. An outbreak ... and Drug Administration (FDA) uses DNA evidence to track down ... Sound far-fetched? It,s not. The FDA has increasingly used ... investigations of foodborne illnesses. Put as simply as possible, whole ...
(Date:6/23/2016)...   EpiBiome , a precision microbiome engineering company, ... financing from Silicon Valley Bank (SVB). The financing will ... its drug development efforts, as well as purchase additional ... has been an incredible strategic partner to us – ... would provide," said Dr. Aeron Tynes Hammack , ...
Breaking Biology Technology: