JAPANESE JOURNAL OF ECOLOGY
Online ISSN : 2424-127X
Print ISSN : 0021-5007
ISSN-L : 0021-5007
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Volume 60, Issue 2
Displaying 1-21 of 21 articles from this issue
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In Memoriam
Original Articles
  • Estimation of sedimentation depth and its history on backswamp of Kuchoro river, Kushiro mire, northeast Hokkaido
    Yoshiyasu Fujimura, Kunihiko Kato, Hideshi Fujiwara, Hiroko Fujita, Ma ...
    Article type: Article
    2010 Volume 60 Issue 2 Pages 157-168
    Published: July 31, 2010
    Released on J-STAGE: April 21, 2017
    DOIhttps://doi.org/10.18960/seitai.60.2_157
    JOURNAL FREE ACCESS
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    We conducted a soil investigation to (1) describe the sedimentation history, (2) discuss the factors of sedimentation changes and (3) discuss the effects of sediment deposition on the sedimentation rate of the backswamp of the Kuchoro River in Japan, which delivers considerable amounts of sediment to the Kushiro mire from its catchment area. Carbon content profiles were produced from soil cores that were sampled along transects perpendicular to the river channels. The 137Cs concentration and the tephra layer (Ta-a) were used to detect layers deposited in 1963 and 1739, respectively. The results revealed that the backswamp of the Kuchoro River started receiving more sediment from about 1963. This increase in sediment is thought to be related to frequent flooding from 1957 to 1965. The amount of inorganic material in the sediment decreased with an increase in the distance from the river channel: 0.521 and 0.098kg/m2yr at distances of 150 and 250m from the river, respectively. However, sedimentation rates (cm/yr) were similar regardless of the amount of sediment deposited. This indicates that sedimentation rates were not affected by the sediment deposition that has increased from about 1963 at our study transect in backswamp of the Kuchoro River.
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Review
  • Adaptive significance of the temperature-size rule
    Takahiro Irie
    Article type: Article
    2010 Volume 60 Issue 2 Pages 169-181
    Published: July 31, 2010
    Released on J-STAGE: April 21, 2017
    DOIhttps://doi.org/10.18960/seitai.60.2_169
    JOURNAL FREE ACCESS
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    Ectotherms often exhibit smaller adult body size with faster growth when reared at higher temperatures. The phylogenetically widespread trend in this thermal life-history plasticity is called the "temperature-size rule." Empirical evidence suggests that this thermal reaction norm has adaptive significance, but specifying its ultimate mechanism remains an open question. Most existing hypotheses are based on optimality models, which hinders an intuitive understanding of the theories. Such models explain which phenotypes maximize fitness via natural selection within a particular phenotypic range, determined by specific constraints and tradeoffs. In this article, I review these hypotheses to facilitate future empirical efforts to test their validity and discuss the main issues that need to be addressed in the near future.
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Feature Species distribution, dynamics and ecological traits: a macroecological perspective
News
Museum and Ecology (13)
From field research sites (15)
An introduction to ecogenomics (5)
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