Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

91
Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
91
Modeling with Differential Equations01:25

Modeling with Differential Equations

296
Population dynamics can be described mathematically by considering the population size P(t) as a function of time. The rate of change of the population is then represented by the derivative of P(t). A simple assumption is that the rate of growth is proportional to the size of the population itself. This leads to an exponential growth model, where the population increases rapidly without bound. While this is a useful first approximation, it does not reflect realistic long-term...
296
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

66.5K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
66.5K
Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model01:13

Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model

407
Drugs administered through various routes can lead to nonlinear elimination, resulting in complex pharmacokinetic behaviors crucial to understanding efficacious drug dosing.
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...
407
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

77.9K
Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
77.9K
Frequency-dependent Selection01:21

Frequency-dependent Selection

24.6K
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.
24.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Rupture of Hematoma of the Broad Ligament-Operated.

Buffalo medical journal·2023
Same author

The effects of evolution on the stability of competing species.

Journal of biological dynamics·2022
Same author

Closed Fluxtubes and Dispersive Proton Conics at Jupiter's Polar Cap.

Geophysical research letters·2022
Same author

A Behavioral Lifestyle Intervention to Improve Frailty in Overweight or Obese Older Adults with Type 2 Diabetes: A Feasibility Study.

The Journal of frailty & aging·2022
Same author

Comparison of neutral outgassing of comet 67P/Churyumov-Gerasimenko inbound and outbound beyond 3 AU from ROSINA/DFMS.

Astronomy and astrophysics·2020
Same author

Hierarchical competition models with the Allee effect III: multispecies.

Journal of biological dynamics·2018

Related Experiment Video

Updated: Apr 20, 2026

Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System
09:23

Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System

Published on: November 1, 2017

12.7K

A discrete-time host-parasitoid model with an Allee effect.

G Livadiotis1, L Assas, B Dennis

  • 1a Southwest Research Institute , San Antonio , TX , USA.

Journal of Biological Dynamics
|November 29, 2014
PubMed
Summary

This study introduces a host-parasitoid model with an Allee effect, revealing two scenarios: one leading to extinction or host exclusion, and another allowing host-parasitoid coexistence or extinction.

Keywords:
39A1192D25Allee effectcoexistenceextinctionhostparasitoidstability

More Related Videos

Author Spotlight: Advanced Enteroid Model for Studying Host-Pathogen Interactions
07:56

Author Spotlight: Advanced Enteroid Model for Studying Host-Pathogen Interactions

Published on: April 5, 2024

2.8K
Author Spotlight: Real-Time Monitoring of Parasite Burden and Host Response
07:59

Author Spotlight: Real-Time Monitoring of Parasite Burden and Host Response

Published on: May 31, 2024

2.3K

Related Experiment Videos

Last Updated: Apr 20, 2026

Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System
09:23

Methodology for Developing Life Tables for Sessile Insects in the Field Using the Whitefly, Bemisia tabaci, in Cotton As a Model System

Published on: November 1, 2017

12.7K
Author Spotlight: Advanced Enteroid Model for Studying Host-Pathogen Interactions
07:56

Author Spotlight: Advanced Enteroid Model for Studying Host-Pathogen Interactions

Published on: April 5, 2024

2.8K
Author Spotlight: Real-Time Monitoring of Parasite Burden and Host Response
07:59

Author Spotlight: Real-Time Monitoring of Parasite Burden and Host Response

Published on: May 31, 2024

2.3K

Area of Science:

  • Ecology
  • Mathematical Biology
  • Population Dynamics

Background:

  • The Nicholson-Bailey model is a foundational host-parasitoid model.
  • Allee effects can significantly impact population dynamics by reducing per capita growth at low densities.
  • Intraspecific competition is a key factor in regulating population sizes.

Purpose of the Study:

  • To investigate the impact of a strong Allee effect on host populations within a discrete-time host-parasitoid model.
  • To analyze the stability and dynamics of populations under combined Allee effects and intraspecific competition.
  • To identify conditions favoring species extinction, exclusion, or coexistence.

Main Methods:

  • Adaptation of the Nicholson-Bailey model to incorporate a positive density-dependent factor (Allee effect) and a negative density-dependent factor (intraspecific competition).
  • Analysis of a discrete-time dynamical system to identify fixed points and their stability.
  • Phase-plane analysis to delineate regions of different population outcomes.

Main Results:

  • The model exhibits two main scenarios based on the presence or absence of interior fixed points.
  • Scenario 1 (no interior fixed points): Outcomes include universal extinction or two distinct regions—an extinction region and a host exclusion region where the host reaches carrying capacity.
  • Scenario 2 (one interior fixed point): Outcomes include universal extinction or two regions—an extinction region and a coexistence region where both host and parasitoid survive.

Conclusions:

  • The Allee effect, combined with intraspecific competition, introduces complex dynamics into host-parasitoid interactions.
  • The presence and stability of interior fixed points critically determine whether coexistence or exclusion/extinction prevails.
  • This modified model provides insights into the conditions under which host-parasitoid systems may collapse or persist.