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Predator-Prey Interactions

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

What are Populations and Communities?

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Types of Selection

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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Updated: Dec 30, 2025

Visualizing Efficacy of Pesticides Against Disease Vector Mosquitoes in the Field

Visualizing Efficacy of Pesticides Against Disease Vector Mosquitoes in the Field

Published on: March 16, 2019

Predator density modifies mosquito regulation in increasingly complex environments.

Mmabaledi Buxton¹, Ross N Cuthbert², Tatenda Dalu³

¹Department of Biological Sciences and Biotechnology, Botswana International University of Science and Technology, Palapye, Botswana.

Pest Management Science

|January 17, 2020

Summary

This summary is machine-generated.

Habitat complexity impacts predator interactions differently for Anisops sardea and Enithares chinai. This affects their biocontrol efficacy against mosquito larvae, complicating pest management in diverse environments.

Keywords:

Culex pipiens pipiens biological control functional response habitat complexity multiple predator effects predator-prey interactions

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Last Updated: Dec 30, 2025

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Area of Science:

Ecology
Aquatic Entomology
Predator-Prey Dynamics

Background:

Predation is crucial for ecosystem structure and function.
Habitat complexity and predator density influence ecological interactions.
Natural enemy efficacy in controlling vector pests can be context-dependent.

Purpose of the Study:

To experimentally quantify predator effects of two notonectids (Anisops sardea and Enithares chinai) on mosquito larvae (Culex pipiens pipiens).
To assess conspecific multiple predator effects across a habitat complexity gradient using a functional response approach.

Main Methods:

Utilized a functional response (FR) approach to measure consumption rates.
Experimentally manipulated habitat complexity and predator density.
Compared the feeding behavior of Anisops sardea and Enithares chinai towards Culex pipiens pipiens larvae.

Main Results:

Enithares chinai showed higher consumption rates than Anisops sardea.
Both species exhibited Type II functional responses.
Synergistic predator effects occurred without habitat complexity, while complexity led to antagonism, especially with Anisops sardea.

Conclusions:

Species-specific responses to habitat complexity alter multiple predator interactions.
Habitat complexity can reduce predator efficacy, complicating biocontrol predictions in varied environments.
Pest management should consider density, diversity, and habitat effects for effective biocontrol.