JAPANESE JOURNAL OF ECOLOGY
Online ISSN : 2424-127X
Print ISSN : 0021-5007
ISSN-L : 0021-5007
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Volume 25, Issue 3
Displaying 1-16 of 16 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1975 Volume 25 Issue 3 Pages Cover1-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_Cover1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1975 Volume 25 Issue 3 Pages Cover2-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_Cover2
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    1975 Volume 25 Issue 3 Pages App1-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_App1
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  • STUDIES ON THE FREQUENCY DISTRIBUTION OF THE WEIGHT OF INDIVIDUAL TREES IN A FOREST STAND : V. THE M-w DIAGRAM FOR VARIOUS TYPES OF FOREST STANDS
    Kazuo HOZUMI
    Article type: Article
    1975 Volume 25 Issue 3 Pages 123-131
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_123
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    The M-w diagram for various types of forest stands can be approximated by a few segmental linear relationships between M and w. Each segment is related to the story (stratum) with the specific characteristics of the beta-type distribution function. And this function reflects some aspect of the modes of packing trees in a three dimensional space as realized eventually by the real forest stand. The number of stories distinguished by the M-w diagram ranges from four to one as related to the climatic conditions under which the forest stands grow.
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  • STUDIES ON THE RATE OF DECAY OF WOOD LITTER ON THE FOREST FLOOR : II. DRY WEIGHT LOSS AND CO_2 EVOLUTION OF DECAYING WOOD
    Tsuyoshi YONEDA
    Article type: Article
    1975 Volume 25 Issue 3 Pages 132-140
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_132
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    The relative rate of dry weight loss (r) and the rate of CO_2 evolution (R) in wood litter were observed under natural conditions on the floor of evergreen oak forests in Japan. The CO_2 evolution rate increased exponentially with the rise of temperature during both the short-term and longer seasonal changes of temperature, with the Q_10 values of 1.76 and 3.32 respectively. Both R and r were linearly correlated with the apparent density (ρ) of dead wood. R was maximized at the medium water content in each group of dead wood sample having similar ρ values. A logistic equation was derived from the R-ρ relation to describe the time trend of dry weight loss.
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  • ANIMAL INFLUENCES ON JAPANESE PINE SEEDS OF THE FOREST FLOOR : II. SEED INPUT AND OUTPUT OF SEEDLING WITH SEED COAT
    Young-Deuk RIM, Tsunahide SHIDEI
    Article type: Article
    1975 Volume 25 Issue 3 Pages 141-148
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_141
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    The process from seed input to seedling output of the Japanese red and black pine was investigated in the forests of Iwakura, Tanakami, and Kiryu during the period from seed fall to seedling emergence. Pine seeds produced are exposed to enemies such as squirrels on the tree and birds or field mice on the seedbed. A small part of the seeds was consumed by squirrels (2.6-13.9%) and most of the fallen seeds on the forest floor were attacked by birds and field mice (86-97%). Seed relocation due to rain showed remarkable difference between on litter and on naked soil. Seedlings emerged were very small compared with the number of seeds produced. This may be entirely due to animal damage. Seed-glueing method to catch clues responsible for animal agents seemed to be available.
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  • CHANGES OF GERMINABILITY OF WEED SEEDS DURING STORAGE IN AIR-DRY CONDITION II
    nobuo hiramatsu
    Article type: Article
    1975 Volume 25 Issue 3 Pages 149-154
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_149
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    Changes of germinability of weed seeds during two years of air-dry storage were studied not noly for the 35 species treated in a previous paper but also for the additional 33 species. The species which did not germinate in the first year failed to germinate in the second year. This trend was found in Paederia scandens, Clematis apiifolia, C. Maximowiczianum, Trichosanthes cucumeroides, Villebrunea frutescens, Phryma leptostachya, Dioscorea japonica, Cardiocrinum cordatum, Arundinella hirta and Commelina communis among the 68 species. Thirty-two of the 58 species that germinated in the first year did not germinate in the second year, but 17 species indicated that the maximum germinability of the first year was more than 50 percent of that of the first year. Changes of seed germinability in the two years were classified into nine patterns on the basis of transitions of germination types from the first year to the second year.
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  • STUDIES ON THE BOTTOM FAUNA OF LAKES MASHU-KO, AKAN-PANKE-KO AND TOYONI-KO, HOKKAIDO, JAPAN
    Norizumi KITAGAWA
    Article type: Article
    1975 Volume 25 Issue 3 Pages 155-159
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_155
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    Three lakes in Hokkaido, Mashu-ko, Akan-Panke-ko and Toyoni-ko were investigated in 1974 with regard to their bottom fauna. In lake Mashu-ko, Micropsectra sp. A, though not abundant, occurred in the zone shallower than about 100 m. In the profundal zone deeper than 160 m, no macroscopic animals were found, except for the very rare occurrence of Procladius sp. F. This lake belongs to an oligotrophic-Tanytarsus lake. In Akan-Panke-ko, Sergentia sp. B was found in the profundal zone deeper than 40 m and Calopsectra sp. J in the zone shallower than 40 m. Though this lake belongs to an oligotrophic-Tanytarsus lake, slight eutrophication is in progress. In Toyoni-ko, Sergentia sp. B was abundant in the profundal zone, except at the central part deeper than 17 m. In the central part of the lake where the dissolved oxygen content was measured to be 8.4%, only Tubifex sp. was found. This lake belongs to a mesotrophic-Sergentia lake.
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  • THE SEASONAL AND THE ANNUAL CHANGES OF BENTHIC COMMUNITIES OF THE CLIMAX IN RAPIDS OF THE STREAM
    Tsukasa KOMATSU
    Article type: Article
    1975 Volume 25 Issue 3 Pages 160-172
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_160
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    The seasonal and the annual changes of benthic communities of the climax in rapids were studied at Heiwabashi station in the middle reaches of the Taru River, during the years from 1968 to 1974. The Taru River, about 18 km in length, is situated in Nagano Prefecture, Central Japan. The River has clean water and a stable environment. A net-spinning caddis-worm Stenopsyche griseipennis was always dominant. But the next dominant species changed with each season and year by year. The benthic communities were composed of 18 to 27 species per 0.25 m^2 (50 cm×50 cm), and the maximum number of species was in early spring. The individual number increased in summer. The standing crops were 3.9 g to 23.5 g in wet samples per 0.5 m^2,the maximum being in spring and the minimum at the end of autumn. The diversity index was at the minimum in summer and at the maximum in early spring. The annual changes in the number of species, individual numbers and standing crops of the benthic communities were relatively small. But each species except the dominant species had noticeable annual changes in the individual numbers and standing crops.
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  • ON THE RELATIONS OF THE TURNOVER RATE TO P/B^^- AND P/B_<MAX>
    Masaaki MORISTTA
    Article type: Article
    1975 Volume 25 Issue 3 Pages 173-184
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_173
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    In the production ecology of animal populations, the turnover rate has usually been defined by P/B^^-, where P is the net production and B^^- the mean biomass during a given period or over the life of a cohort. However, it is shown theoretically that the above definition is not applicable to the non-stationary populations, and that the turnover rate of a population should be defined in general by the ratio of the "mean appearance time" to the mean residence time of the biomass. The tumover rate thus defined can be measured by E/B_MAX or at least approximately by P/B_MAX, where E is the elimination and B_MAX the maximum biomass of the population. The estimated P/B_MAX values based on three estimates of B_MAX (B_max, B^*_max and B^**_max) were compared with each other and with P/B^^- for the populations of several aquatic insects.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1975 Volume 25 Issue 3 Pages 185-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_185_1
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1975 Volume 25 Issue 3 Pages 185-186
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_185_2
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  • [title in Japanese]
    Article type: Appendix
    1975 Volume 25 Issue 3 Pages 186-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_186
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  • [title in Japanese]
    Article type: Appendix
    1975 Volume 25 Issue 3 Pages App2-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_App2
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  • [title in Japanese]
    Article type: Cover
    1975 Volume 25 Issue 3 Pages Cover3-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_Cover3
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  • [title in Japanese]
    Article type: Cover
    1975 Volume 25 Issue 3 Pages Cover4-
    Published: September 30, 1975
    Released on J-STAGE: April 11, 2017
    DOIhttps://doi.org/10.18960/seitai.25.3_Cover4
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