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Related Concept Videos

Ecological Niches02:02

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
Distribution and Dispersion00:54

Distribution and Dispersion

To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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.
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.
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.

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Updated: May 10, 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

Niche breadth predicts geographical range size: a general ecological pattern.

Rachel A Slatyer1, Megan Hirst, Jason P Sexton

  • 1Department of Zoology, University of Melbourne, Melbourne, VIC, Australia. rslatyer@student.unimelb.edu.au

Ecology Letters
|June 19, 2013
PubMed
Summary
This summary is machine-generated.

Species with narrow niches (specialists) tend to have smaller geographic ranges. This niche breadth-range size relationship suggests specialists may be more vulnerable to extinction from habitat loss and climate change.

Keywords:
Extinction riskgeographical rangemeta-analysisniche breadthrarityspecialisation

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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Published on: January 13, 2023

Related Experiment Videos

Last Updated: May 10, 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

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
08:56

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Published on: January 13, 2023

Area of Science:

  • Ecology
  • Conservation Biology
  • Biogeography

Background:

  • The relationship between a species' niche breadth and its geographic range size is a fundamental ecological question.
  • Understanding this link can explain patterns of species commonness and rarity.
  • It may also help predict species' vulnerability to environmental changes and extinction risk.

Purpose of the Study:

  • To test the hypothesis that a positive relationship exists between niche breadth and range size across species.
  • To determine if niche breadth is a predictor of geographic range size.
  • To assess the implications of this relationship for species conservation.

Main Methods:

  • Conducted a meta-analysis of 64 studies that measured both niche breadth and range size.
  • Quantified the relationship between range size and environmental tolerance breadth, habitat breadth, and diet breadth.
  • Accounted for potential sampling effects in the meta-analysis.

Main Results:

  • A significant positive relationship was found between range size and environmental tolerance breadth (z = 0.49).
  • A significant positive relationship was found between range size and habitat breadth (z = 0.45).
  • A significant positive relationship was found between range size and diet breadth (z = 0.28).
  • The positive effect remained significant after accounting for sampling effects.

Conclusions:

  • Species with broader niches generally occupy larger geographic areas.
  • Specialist species, with narrow niches and small ranges, may be disproportionately vulnerable to habitat loss and climate change.
  • Further research is needed to understand the ecological and evolutionary drivers of this pattern and its deviations.