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Related Concept Videos

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.

Limits to Natural Selection

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.

Competition

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.

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...

Optimal Foraging

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.

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.

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Related Experiment Video

Updated: Nov 10, 2025

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Published on: December 14, 2006

Functional and Environmental Constraints on Prey Capture Speed in a Lizard.

D R Adams¹, M E Gifford²

¹Vilonia High School, 1164 Main St, Vilonia, AR 72173, USA.

Integrative Organismal Biology (Oxford, England)

|April 1, 2021

Summary

This summary is machine-generated.

Habitat complexity significantly impacts Prairie Lizard foraging. Cluttered environments slow prey capture and reduce attack distance, affecting foraging success more than intrinsic traits.

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Last Updated: Nov 10, 2025

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Area of Science:

Ethology
Ecology
Biomechanics

Background:

Animal movement is crucial for environmental interaction and foraging.
Movement speed is influenced by internal and external factors like habitat complexity.
Optimal foraging theory suggests balancing prey capture with minimizing errors.

Purpose of the Study:

To investigate how habitat complexity affects foraging behavior in Prairie Lizards.
To determine the influence of obstacle arrangement on attack distance, prey capture speed, and foraging success.

Main Methods:

Experimental arenas with varying obstacle configurations (uniform, clustered, none) were used.
Prairie Lizards' foraging behavior, including attack distance and prey capture speed, was observed.
Prey capture and consumption probabilities, along with foraging accuracy, were analyzed in relation to arena type and speed.

Main Results:

Uniformly spaced obstacles led to slower prey capture (15%) and shorter attack distances (30-38%) compared to open or clustered obstacle arenas.
Prey capture probability decreased with attack distance, while consumption probability decreased with attack distance and, in open arenas, with increased speed.
Foraging accuracy decreased with speed in open arenas but remained stable in cluttered environments.

Conclusions:

Foraging success is constrained by intrinsic speed-maneuverability trade-offs in open spaces.
Environmental complexity (habitat clutter) plays a more significant role in foraging success than intrinsic factors.
This study provides empirical support for theoretical models of optimal animal movement speeds in natural settings.