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Related Experiment Video

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Assessment of Social Cognition in Non-human Primates Using a Network of Computerized Automated Learning Device (ALDM) Test Systems
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Published on: May 5, 2015

Testing the island rule: primates as a case study.

John J Welch1

  • 1Institute of Evolutionary Biology, University of Edinburgh, Edinburgh EH9 3JT, UK. j.j.welch@ed.ac.uk

Proceedings. Biological Sciences
|October 30, 2008
PubMed
Summary
This summary is machine-generated.

The island rule predicts body size changes in animals colonizing islands. This study reveals statistical biases in common tests, proposing a new method and finding the rule applies to primates when using skull length or body mass.

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Area of Science:

  • Evolutionary Biology
  • Biogeography
  • Ecology

Background:

  • The island rule posits that insular species evolve body size changes: larger species decrease, smaller species increase.
  • Recent debates question the island rule's prevalence due to statistical methodology discrepancies.
  • Different statistical tests for the island rule rely on varied null hypotheses and biological assumptions.

Purpose of the Study:

  • To analyze and quantify biases in statistical tests used to evaluate the island rule.
  • To introduce a robust statistical method that avoids common testing pitfalls.
  • To re-evaluate the island rule's applicability in primates using revised methodologies.

Main Methods:

  • Statistical analysis and simulation to identify and quantify biases in existing island rule tests.
  • Development and application of a Monte Carlo permutation test to address methodological artifacts.
  • Reanalysis of primate data using different body size metrics (head-body length, skull length, body mass).

Main Results:

  • Many widely used statistical tests provide false support for the island rule when island and mainland evolution are similar.
  • Tests based on independent contrasts may lack statistical power under specific evolutionary scenarios.
  • Reanalysis of primate data reveals that previous findings of the island rule were often methodological artifacts, but the rule holds when using skull length or body mass.

Conclusions:

  • The validity of the island rule is highly dependent on the statistical methods employed.
  • A Monte Carlo permutation test offers a more reliable approach to testing the island rule.
  • The island rule is supported in primates when appropriate body size measures (skull length, body mass) are used, challenging prior conclusions based on head-body length.