Related Experiment Video
Updated: Jun 3, 2026
06:25
A Real-Time Interactive System for Studying Confrontational Pursuit Behavior in Rodents
Published on: May 16, 2025
Density-dependent predation influences the evolution and behavior of masquerading prey
John Skelhorn1, Hannah M Rowland, Jon Delf
1Centre for Research in Animal Behaviour, College of Life and Environmental Sciences, University of Exeter, Washington Singer Laboratories, Exeter EX4 4QG, United Kingdom. J.P.Skelhorn@exeter.ac.uk
Summary
Organisms using masquerade for anti-predator defense benefit most when rare. Increasing masquerader density reduces this benefit by decreasing predator search motivation and detection success.
Area of Science:
- Ecology
- Evolutionary Biology
- Animal Behavior
Background:
- Predation drives the evolution of anti-predator traits.
- Masquerade, resembling inanimate objects, is a poorly understood defensive strategy.
Purpose of the Study:
- Investigate the evolutionary dynamics of masquerade.
- Examine behavioral adaptations in masquerading species.
Main Methods:
- Laboratory experiments using avian predators and twig-mimicking caterpillars.
- Analysis of masquerade benefits in relation to masquerader and model density.
Main Results:
- Masquerade benefits decrease as masquerader density increases relative to models.
- Increased model density reduces predator search motivation and detection.
- Masquerading organisms employ microhabitat selection to optimize masquerade effectiveness.
Conclusions:
- Masquerade effectiveness is density-dependent.
- Opportunity costs are associated with masquerade.
- Understanding these costs is crucial for evolutionary and ecological studies of masquerade.
Related Concept Videos
02:39Predator-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.Although predation is commonly associated with carnivory, for...
01:21Frequency-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.Positive Frequency-Dependent SelectionIn positive...
01:28Microbial Interactions: Predation
Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...
01:20Mate Choice
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
00:48Optimal 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.
01:46Types 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...