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A Method for Quantifying Foliage-Dwelling Arthropods
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Which insect species numerically respond to allochthonous inputs?

Shinji Sugiura1, Hiroshi Ikeda

  • 1Graduate School of Agricultural Science, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan. sugiura.shinji@gmail.com

Die Naturwissenschaften
|June 20, 2013
PubMed
Summary

Heron (Ardeidae) colonies provide organic material, increasing some forest arthropod populations like earwigs and beetles. However, ant abundance decreased, influenced by species-specific traits and environmental changes.

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Area of Science:

  • Ecology
  • Forest Ecology
  • Arthropod Ecology

Background:

  • Herons deposit organic matter (prey, chick carcasses) in forest ecosystems.
  • Allochthonous inputs are known to influence forest arthropod populations.
  • Specific arthropod species and factors driving their numerical responses in heron colonies are not well understood.

Purpose of the Study:

  • To investigate arthropod population density differences between heron breeding colonies and non-colony areas.
  • To identify specific arthropod groups and species exhibiting numerical responses to heron-derived allochthonous inputs.
  • To explore factors influencing individual species' numerical responses.

Main Methods:

  • Comparison of arthropod densities using pitfall and baited traps.

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  • Study sites included five heron breeding colonies and five control areas in central Japan.
  • Analysis of differences in abundance for various arthropod groups and species.

    • Main Results:

    • Overall arthropod density did not differ significantly between colony and non-colony sites.
    • Earwigs (Anisolabididae), hister beetles (Histeridae), and carrion beetles (Silphidae) were more abundant in colonies.
    • Ants (Formicidae) were less abundant in colonies, with specific species showing numerical responses to heron inputs.

    Conclusions:

    • Heron carcasses directly support increased populations of certain consumers (earwigs, histerids, silphids).
    • Microenvironmental changes in colonies may negatively impact ant abundance.
    • Life history traits, such as reproductive behavior, likely determine individual species' numerical responses to allochthonous inputs.