JAPANESE JOURNAL OF ECOLOGY
Online ISSN : 2424-127X
Print ISSN : 0021-5007
ISSN-L : 0021-5007
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Volume 61, Issue 1
Displaying 1-21 of 21 articles from this issue
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Review
  • Similarity indices, ordination, and community analysis tests using the software R
    Hideyuki Doi, Hiroshi Okamura
    Article type: Article
    2011 Volume 61 Issue 1 Pages 3-20
    Published: March 30, 2011
    Released on J-STAGE: April 21, 2017
    DOIhttps://doi.org/10.18960/seitai.61.1_3
    JOURNAL FREE ACCESS
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    Similarity indices are frequently used in ecological analyses to compare community structure between ecosystems and experimental treatments. However, many ecological analyses have used classical similarity indices, even though new similarity indices and statistical tests have been proposed. In this review, we introduce representative and useful similarity indices and statistical tests for analyzing ecological communities. We recommend using the statistical software R with the "vegan" package to analyze similarity indices. We synthesized the frequency with which similarity indices have been used for ecological studies and found that classical similarity indices, such as the Jaccard index, have been used by researchers in the past decade. Here, we emphasize that the Chao index is one of the best options among similarity indices when considering the probability of rare species in communities. To test for differences in community similarity, PERMANOVA is one of the best tests for ecological analyses. Ecologists should use adequate similarity indices and tests.
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  • Contribution of physical protection and/or chemical adsorption of easily decomposable soil organic matter to the processes of mineralization
    Kaori Matsuoka
    Article type: Article
    2011 Volume 61 Issue 1 Pages 21-29
    Published: March 30, 2011
    Released on J-STAGE: April 21, 2017
    DOIhttps://doi.org/10.18960/seitai.61.1_21
    JOURNAL FREE ACCESS
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    The mineralization rate of soil organic matter by soil microorganisms is influenced strongly not only by the inherent chemical nature of the organic matter (i.e., its chemical structure, functional groups, and composition) but also by the interactions with soil components. These interactions can be classified roughly into physical protection and chemical adsorption. Physical protection is defined as the inaccessibility of soil organic matter to soil microorganisms due to obstruction by soil components, whereas chemical adsorption is defined as the degree of the adsorptive forces between soil organic matter and soil components. This paper provides an overview of the significance of these two processes, with a focus on analytical methodologies.
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Feature 1 Movement and biotic utilization of particulate organic matter in fluvial systems
Feature 2 Influence of Long-range Transport of Air Pollution on the Japanese Ecosystems
From field research sites (17)
Museum and Ecology (15)
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