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Migration00:53

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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Populations are groups of individuals of the same species that inhabit a shared environment. Communities include multiple co-existing, interacting populations of different species. Metapopulations span multiple populations of the same species that occupy different areas. Metapopulations interact through immigration and emigration, providing genetic diversity that lends resilience to harsh environments. Population size and density can be estimated using quadrat and mark and recapture...
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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.Positive Frequency-Dependent SelectionIn positive...
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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...
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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.
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Assessing microbial populations is crucial for understanding microbial roles in health, ecology, and industry. Various complementary techniques—both culture-based and molecular—enable detailed analysis of microbial abundance, diversity, and function.Viable Plate CountThe viable plate count is a traditional culture-based method used to estimate the number of living microbes in a sample. After serial dilution, the sample is spread onto nutrient agar plates. Each viable cell forms a visible...

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Related Experiment Video

Updated: Jul 12, 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

Stream insect occupancy-frequency patterns and metapopulation structure.

T Heatherly1, M R Whiles, D J Gibson

  • 1Department of Zoology and Center for Ecology, Southern Illinois University, Carbondale, IL 62901-6501, USA. heatherly75@yahoo.com

Oecologia
|November 9, 2006
PubMed
Summary

Stream insect communities are dominated by satellite species, with their proportion increasing with spatial scale and sampling intensity. Niche-based models better explain these occupancy-frequency patterns than core-satellite hypotheses.

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Area of Science:

  • Ecology
  • Biodiversity patterns
  • Biogeography

Background:

  • Understanding organism distribution is key in ecology.
  • Occupancy-frequency patterns visualize species distributions.
  • Core-satellite species hypothesis is a common model.

Purpose of the Study:

  • Analyze stream insect occupancy-frequency patterns.
  • Assess effects of spatial scale, sampling intensity, and taxonomic resolution.
  • Compare niche-based models with metapopulation models.

Main Methods:

  • Utilized North American stream insect distribution data.
  • Analyzed occupancy-frequency patterns across varying scales.
  • Examined taxonomic resolution effects using New York data.

Main Results:

  • Distributions were dominated by satellite taxa (<10% sites).
  • Satellite taxa proportions increased with spatial scale and sampling intensity (r2=0.74-0.96).
  • Generic-level taxonomy underestimated satellite species and altered distribution modality.

Conclusions:

  • Stream insect communities consistently feature satellite species.
  • Satellite species proportion is influenced by spatial scale and sampling intensity.
  • Niche-based models provide a more accurate characterization than core-satellite models.