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Related Experiment Videos

Scaling regions for food web properties.

L F Bersier1, G Sugihara

  • 1Scripps Institution of Oceanography 0202, University of California at San Diego, La Jolla, CA 92093, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 18, 1997
PubMed
Summary

Food web properties show scale dependence in small webs (≤12 species) but scale invariance in larger webs (>12 species). This resolves debates about scale dependence versus scale invariance in ecological networks.

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Area of Science:

  • Ecology
  • Ecological Network Analysis
  • Food Web Dynamics

Background:

  • Food web properties are crucial for understanding ecosystem stability and function.
  • Existing research presents conflicting findings regarding whether these properties are scale-dependent or scale-invariant.
  • The influence of small-sized food webs on these properties remains under-explored.

Purpose of the Study:

  • To investigate the robustness of eight common food web properties in relation to web size.
  • To resolve the controversy surrounding the scale dependence or scale invariance of food web properties.
  • To identify distinct categories of food webs based on size that exhibit different scaling behaviors.

Main Methods:

  • Statistical analysis of eight common food web properties.

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  • Examination of property robustness across varying web sizes.
  • Categorization of food webs into small (≤12 species) and large (>12 species) groups.

    • Main Results:

    • Food web properties exhibit scale dependence in small webs (≤12 species).
    • Larger food webs (>12 species) demonstrate scale invariance for these properties.
    • Accounting for scaling constraints in small webs resolves the scale dependence/invariance controversy.

    Conclusions:

    • Food web properties are not uniformly scale-invariant across all sizes.
    • A size threshold (12 species) effectively distinguishes between scale-dependent and scale-invariant behaviors.
    • Ecological network analysis should consider distinct size categories for accurate interpretation of food web properties.