Feb 16, 2008

Effects of predator hunting mode on grassland ecosystem function

Science
Oswald J Schmitz

Abstract

The way predators control their prey populations is determined by the interplay between predator hunting mode and prey antipredator behavior. It is uncertain, however, how the effects of such interplay control ecosystem function. A 3-year experiment in grassland mesocosms revealed that actively hunting spiders reduced plant species diversity and enhanced aboveground net primary production and nitrogen mineralization rate, whereas sit-and-wait ambush spiders had opposite effects. These effects arise from the different responses to the two different predators by their grasshopper prey-the dominant herbivore species that controls plant species composition and accordingly ecosystem functioning. Predator hunting mode is thus a key functional trait that can help to explain variation in the nature of top-down control of ecosystems.

  • References12
  • Citations131

References

  • References12
  • Citations131

Citations

Mentioned in this Paper

Behavior, Animal
Alopecurus
Grasshoppers
Predator
Food Web
Ambush
Nitrogen
Pathologic Mineralization
Herbivory
Biodiversity

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