Researchers have suggested that predators could actually...

Name: Problem 6, Chapter 14: Ecology: Concepts and Applications
Uploaded: 2020-10-08T20:53:10-08:00
Duration: 1 min 43 s
Channel: Sam James
Description: Researchers have suggested that predators could actually increase the population density of a prey species heavily infected by a pathogenic parasite (Hudson, Dobson, and Newborn 1992). Explain how predation could lead to population increases in the prey population.

Researchers have suggested that predators could actually increase the population density of a prey species heavily infected by a pathogenic parasite (Hudson, Dobson, and Newborn 1992). Explain how predation could lead to population increases in the prey population.

Key Concepts

Population Regulation

Population regulation involves the various factors that control population size, including predation, disease, and competition. Predatory removal of infected individuals can lessen the effects of disease outbreaks and competition among survivors, leading to an overall increase in reproductive success and a higher population density.

Selective Predation

This concept refers to the tendency of predators to target individuals in the prey population that are weakened by infection. By removing these less fit, diseased individuals, predators reduce the overall parasite load within the prey community, which can result in a healthier, more resilient population that is better able to reproduce and sustain higher densities.

Pathogen-Host Dynamics

Pathogen-host dynamics explore the interactions between diseases and their hosts. In the context of predation, when predators remove highly parasitized individuals, they diminish the spread and impact of the pathogen. This reduces disease-induced mortality, allowing the population to stabilize and possibly increase in density.

Disease Ecology

Disease ecology studies the effects of infectious diseases on population dynamics and community structure. In systems where parasitic infections play a significant role, predation can create an ecological cascade by indirectly controlling parasite prevalence. By selectively preying on the infected, predators contribute to a healthier host population, which may result in increased numbers over time.

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