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Predator satiation

predator satiation, predator satiation definition
Predator satiation less commonly called predator saturation is an antipredator adaptation in which prey briefly occur at high population densities, reducing the probability of an individual organism being eaten When predators are flooded with potential prey, they can consume only a certain amount, so by occurring at high densities prey benefit from a safety in numbers effect This strategy has evolved in a diverse range of prey, including notably many species of plants, insects, and fish Predator satiation can be considered a type of refuge from predators:340

As available food increases, a predator has more chances of survival, growth, and reproduction However, as food supply begins to overwhelm the predator's ability to consume and process it, consumption levels off This pattern is evident in the functional response of type II There are also limits to population growth numerical response, dependent on the generation time of the predator species

This phenomenon is particularly conspicuous when it takes the form of masting, the production of large numbers of seeds by a population of plants

Some periodical cicada Magicicada species erupt in large numbers from their larval stage at intervals in years that are prime numbers, 13 or 17 At high-density sites, research finds that the number eaten by birds does not increase with the number of cicada individuals and the risk of predation for each individual decreases

In contrast to predator satiation, a different pattern is seen in response to mutualistic consumers, which benefit an organism by feeding from it such as frugivores, which disperse seeds For example, a vine's berries may ripen at different times, ensuring frugivores are not swamped with food and so resulting in a larger proportion of its seeds being dispersed

See also

  • Selfish herd
  • Semelparity

References

  1. ^ Williams, Kathy S; Smith, Kimberly G; Stephen, Frederick M 1993 "Emergence of 13-Yr Periodical Cicadas Cicadidae: Magicicada: Phenology, Mortality, and Predators Satiation" Ecology 74 4: 1143 doi:102307/1940484 ISSN 0012-9658 JSTOR 1940484 
  2. ^ a b Molles, Manuel C, Jr 2002 Ecology: Concepts and Applications International ed New York: The McGraw-Hill Companies, Inc pp 586 pp ISBN 0-07-112252-4 
  3. ^ Begon, M, JL Harper and CR Townsend 1996 Ecology: individuals, populations, and communities, Third Edition Blackwell Science Ltd, Cambridge, Massachusetts, USA
  4. ^ "Periodical Cicadas, Life Cycles & Behavior" OSU Retrieved 2015-02-06 
  5. ^ Karban, Richard April 1982 "Increased Reproductive Success at High Densities and Predator Satiation For Periodical Cicadas" Ecology 63 2: 321–328 doi:102307/1938949 JSTOR 1938949 

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    29.10.2014


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