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Related Concept Videos

Genetic Drift03:33

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
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...
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

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.In the early 20th century,...
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...
Types of Selection01:46

Types 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...

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Related Experiment Video

Updated: Jun 16, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
08:16

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

Heterogeneous landscapes promote population stability.

Tom Oliver1, David B Roy, Jane K Hill

  • 1NERC Centre for Ecology & Hydrology, Oxfordshire, UK. toliver@ceh.ac.uk <toliver@ceh.ac.uk>

Ecology Letters
|February 13, 2010
PubMed
Summary
This summary is machine-generated.

Diverse habitats in heterogeneous landscapes stabilize butterfly populations. This finding supports conservation strategies by showing how varied environments benefit species dynamics.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Population Dynamics

Background:

  • Habitat heterogeneity is proposed to enhance population stability and aid species conservation.
  • However, empirical evidence supporting this link has been limited.

Purpose of the Study:

  • To investigate the relationship between landscape heterogeneity and population stability in British butterfly species.
  • To determine if habitat and topographic heterogeneity influence population dynamics.

Main Methods:

  • Analysis of population dynamics data for 35 British butterfly species across 166 sites.
  • Assessment of landscape heterogeneity at spatial scales of 1-5 km radius around study sites.
  • Robustness checks using various measures of population variability and abundance.

Main Results:

  • Heterogeneous landscapes with diverse habitat types were significantly associated with more stable butterfly population dynamics.
  • Topographic heterogeneity also showed a positive correlation with population stability.
  • Species-specific responses were observed, with more mobile species benefiting more from larger-scale habitat heterogeneity.

Conclusions:

  • Landscape heterogeneity, particularly habitat diversity, is crucial for stabilizing butterfly populations.
  • Conservation strategies should prioritize maintaining or enhancing habitat heterogeneity to support species resilience.
  • The findings suggest that varied resources and microclimates in heterogeneous landscapes buffer populations against environmental fluctuations.