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

Conservation of Declining Populations02:07

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Limits to Natural Selection01:38

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.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Life Histories01:29

Life Histories

Constrained by limited energy and resources, organisms must compromise between offspring quantity and parental investment. This trade-off is represented by two primary reproductive strategies; K-strategists produce few offspring but provide substantial parental support, whereas r-strategists produce much progeny that receives little care. These strategies are related to an organism’s survival likelihood across its lifespan, which is represented by a survivorship curve. Three general types of...
Threats to Biodiversity01:50

Threats to Biodiversity

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
Conservation of Small Populations02:04

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...

You might also read

Related Articles

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

Sort by
Same author

AI, Comparative Advantage, and the Next Decade of Ecological Research.

Ecology letters·2026
Same author

On the consequences of collapsing introductions and range expansions under a single framework: A Comment on 'The concept of biological invasions in the Anthropocene: introductions and range expansions' (2026), by Carlton and Schwindt.

Philosophical transactions of the Royal Society of London. Series B, Biological sciences·2026
Same author

Networks of Indirect Contact Promote Spread of an Environmentally Transmitted Pathogen in a Highly Social Species.

Ecology and evolution·2026
Same author

Explaining complex dynamical systems using conditional SHAP analysis with application to multi-variant epidemic dynamics.

Scientific reports·2026
Same author

A single autoregressive integrated moving average with exogenous variable outperforms ensembles of autoregressive models for forecasting influenza hospitalizations in the contiguous United States.

Journal of the Royal Society, Interface·2026
Same author

Nonlinear effects of noise on outbreaks of mosquito-borne diseases.

PLoS computational biology·2026

Related Experiment Video

Updated: Jun 26, 2026

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
07:41

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

Scaling rules for the final decline to extinction.

Blaine D Griffen1, John M Drake

  • 1Odum School of Ecology, University of Georgia, Athens, GA 30605, USA. bgriffen@biol.sc.edu

Proceedings. Biological Sciences
|January 15, 2009
PubMed
Summary

Ecological scaling rules predict population extinction dynamics. This study confirms two extinction predictions, finding persistence duration exceeds decline duration and decline lengthens with carrying capacity, but challenges a third prediction.

More Related Videos

Measurement of Lifespan in Drosophila melanogaster
10:00

Measurement of Lifespan in Drosophila melanogaster

Published on: January 7, 2013

Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Related Experiment Videos

Last Updated: Jun 26, 2026

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
07:41

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

Measurement of Lifespan in Drosophila melanogaster
10:00

Measurement of Lifespan in Drosophila melanogaster

Published on: January 7, 2013

Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Area of Science:

  • Ecology
  • Population Dynamics
  • Theoretical Ecology

Background:

  • Space-time scaling rules are fundamental in ecological phenomena.
  • Existing theory proposes three scaling rules for population extinction decline duration.
  • Empirical validation of these extinction scaling rules has been limited.

Purpose of the Study:

  • To empirically test established space-time scaling rules for population extinction.
  • To investigate these rules under diverse density-dependent population dynamics.
  • To assess predictions regarding extinction decline duration and population persistence.

Main Methods:

  • Experimental manipulation using Daphnia magna as a model organism.
  • Analysis of population dynamics across various density-dependent patterns.
  • Testing specific predictions of extinction scaling theory.

Main Results:

  • Confirmed that population persistence duration significantly exceeds final extinction decline duration.
  • Found that extinction decline duration increases with the logarithm of carrying capacity.
  • Did not find support for the prediction that decline duration scales inversely with population growth rate.

Conclusions:

  • The study provides empirical support for key aspects of standard extinction theory.
  • Findings highlight a discrepancy between theory and empirical results regarding growth rate scaling.
  • Identified new empirical anomalies in population extinction dynamics requiring theoretical explanation.