Paper offers new insights into predator-prey relationships

Apr 07, 2011 By William G. Gilroy
Paper offers new insights into predator-prey relationships

(PhysOrg.com) -- For those old enough to remember Mutual of Omaha’s “Wild Kingdom” television series, the dynamics of predator-prey relationships seemed clear enough: predators thinned out prey populations, which enabled a smaller, but stronger, population to survive and reproduce.

However, a new paper by University of Notre Dame biologist Gary Belovsky appearing in the prestigious journal Ecology Letters suggests that relationships are much more complex than originally thought.

The paper arose out of pioneering studies Belovsky, who also is director of the Notre Dame Environmental Research Center (UNDERC), has been conducting on populations since 1978 at Montana’s National Bison Range, now a location for one of UNDERC’s national undergraduate programs.

Belovsky conducted an experiment to examine how behavioral responses of grasshoppers to avian predators affected grasshopper survival and reproduction at different grasshopper population densities. A series of cages containing grasshoppers were enclosed within a tent constructed of aviary netting, creating a “no threat” area because its design prevented birds from approaching the cages and “scarring” the grasshoppers. A second set of cages provided a “threat” area because it was not enclosed in a tent, which allowed birds to feed around the cages, perch on top consuming grasshoppers caught outside the cages and “scare” the grasshoppers inside the cages.

The research demonstrated that grasshopper behavior changed with the threat of predators, reducing grasshopper feeding, and this was apparent at all grasshopper densities. The behavioral changes with the threat of predation increased survival at low grasshopper densities, as reduced feeding made food available to more individuals, while the changes decreased survival at higher densities, as severe food shortages were made worse by reduced feeding. However, the behavioral changes decreased per capita reproduction over all grasshopper population densities, as grasshoppers traded off survival and reproduction as competition among the grasshoppers increased with greater population densities.

“This type of variable response is generally overlooked when prey behavioral changes with predation are considered in how predation affects prey populations,” Belovsky said. “Resource availability may need to be considered when assessing how prey behavioral changes with predation threat affect population and food web dynamics.”

Belovsky also notes that the new paper reinforces the importance of his western prairie research, which is now the longest running experimental study at a site examining what controls grasshopper populations. Although it isn’t feasible to conduct a population study like this with populations of larger animals, such as elk and wolves in far-flung areas such as Alaska, the more easily observable field work with grasshoppers and birds offers important predator-prey insights that can be applied to these types of populations.

Explore further: Sheep flock to Eiffel Tower as French farmers cry wolf

Related Stories

New fungi could curb grasshopper populations

Jan 07, 2011

(PhysOrg.com) -- Beneficial fungi that could help manage grasshopper populations are being tested by U.S. Department of Agriculture (USDA) scientists and university colleagues.

Post oak grasshoppers emerging

Apr 17, 2007

They're not afraid of heights, they're voracious, and Dr. Spencer Behmer wants to know if you've seen them hanging out in oak trees or on your house. They're post oak grasshoppers, and Behmer, a Texas Agricultural Experiment ...

Recommended for you

How can we avoid kelp beds turning into barren grounds?

7 hours ago

Urchins are marine invertebrates that mould the biological richness of marine grounds. However, an excessive proliferation of urchins may also have severe ecological consequences on marine grounds as they ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

resinoth
not rated yet Apr 07, 2011
this makes sense, if the opposite were true, species would slide to extinction or slide to overpopulation, like a graph that looks like a bump. the results of this study suggest that species, at least with regard to predation pressures, are more robust, with a graph like a trough. This seems to me like very important work for conservation efforts.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.