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 Experiment Videos

K-selection, alpha-selection, effectiveness, and tolerance in competition: density-dependent selection revisited.

A Joshi1, N G Prasad, M Shakarad

  • 1Evolutionary Biology Laboratory, Evolutionary and Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, P.O. Box No. 6436, Jakkur, Bangalore 560 064, India. ajoshi@jncasr.ac.in

Journal of Genetics
|March 23, 2002
PubMed
Summary

Related Concept Videos

You might also read

Related Articles

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

Sort by
Same author

Deployment of COVID-19 Vaccines for Refugees and Migrants in Nepal.

Kathmandu University medical journal (KUMJ)·2026
Same author

Housing density affects the survivorship post infection of Drosophila melanogaster males in a pathogen dependent manner.

Journal of invertebrate pathology·2025
Same author

The impact of co-occurring tumor suppressor mutations with mEGFR as early indicators of relapse in lung cancer.

ESMO open·2025
Same author

Patient Selection and Outcomes in Reirradiation for Head and Neck Cancers: A Prospective Cohort Study.

Clinical oncology (Royal College of Radiologists (Great Britain))·2025
Same author

Invisible Struggles: Exploring Challenges Faced by Women With Amputation in India.

Canadian prosthetics & orthotics journal·2024
Same author

Knowledge, Attitude and Practice in Recurrent Shoulder Dislocation: an analysis of patients presenting at a tertiary referral centre.

Kathmandu University medical journal (KUMJ)·2024

Selection for faster development in fruit flies (Drosophila) can decrease competitive ability. This study broadens density-dependent selection theory to explain why faster development doesn't always mean better competition.

Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Ecological Genetics

Background:

  • Density-dependent selection theory often predicts that adaptation to high population densities enhances competitive ability.
  • Empirical results from high-density evolution experiments, particularly in Drosophila, challenge these classical predictions.
  • Selection for faster development and adaptation to high density are frequently confounded in the literature.

Purpose of the Study:

  • To reconcile conflicting theoretical predictions and empirical observations in density-dependent selection.
  • To propose a broader interpretation of density-dependent selection incorporating alpha-selection and competitive ability components.
  • To predict the correlated evolutionary consequences of selection for faster development in Drosophila.

Main Methods:

Related Experiment Videos

  • Review and synthesis of theoretical and empirical results from Drosophila literature.
  • Presentation of new experimental data from Drosophila populations under selection for faster development.
  • Development of a refined theoretical framework for density-dependent selection.

Main Results:

  • A broader formulation of density-dependent selection, including alpha-selection and distinct components of competitive ability (effectiveness and tolerance), better explains empirical data.
  • Selection for faster development in Drosophila leads to increased efficiency and population growth rates in monotypic culture.
  • Contrary to some expectations, selection for faster development is predicted to correlate with decreased competitive ability.

Conclusions:

  • The study advocates for a more nuanced understanding of density-dependent selection beyond classical models.
  • Incorporating alpha-selection and the effectiveness/tolerance dichotomy provides a more robust framework for studying adaptation to density.
  • Faster development in Drosophila, under this broader framework, is associated with trade-offs, including reduced competitive ability.