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Volume 23 (1973)
- Issue 6 Pages 237-
- Issue 5 Pages 195-
- Issue 4 Pages 141-
- Issue 3 Pages 95-
- Issue 2 Pages 1-
- Issue 1 Pages 1-
Predecessor
Volume 23, Issue 5
Displaying 1-12 of 12 articles from this issue
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Article type: Cover
1973 Volume 23 Issue 5 Pages Cover1-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSDownload PDF (27K) -
Article type: Cover
1973 Volume 23 Issue 5 Pages Cover2-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSDownload PDF (27K) -
Article type: Appendix
1973 Volume 23 Issue 5 Pages App1-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSDownload PDF (118K) -
Hiromitsu KIRITA, Kazuo HOZUMIArticle type: Article
1973 Volume 23 Issue 5 Pages 195-200
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSThe chlorophyll content per unit leaf area (CHL) in Castanopsis cuspidata, Quercus gilva and other evergreen trees was found to decrease and to have less pronounced seasonal change (with an early summer minimum and a winter maximum) toward the bottorn of the forest canopy. The CHL-mean relative illuminance curve proved to be approximately hyperbolic. A formula was derived to estimate the total amount of chlorophyll held by the total forest canopy (CHLF, in a land area basis), based on this regression and the exponential extinction of light with cumulative leaf area density along the canopy profile. Estimated CHLF increased from the new leaf stage in June through summer to a maximum value (ca. 40 kg/ha) in winter, and reached a minimum (ca. 20 kg/ha) in June when most of the leaves were shed. The correlation between CHLF and the rate of gross canopy photosynthesis was positive during the peripds of June-August and Novembr-March, while it turned out to be negative in March-June and August-November.View full abstractDownload PDF (550K) -
Haruo OGI, Tokimi TSUJITAArticle type: Article
1973 Volume 23 Issue 5 Pages 201-209
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSTo clarify the food relationship between seabirds and juvenile sockeye salmon (Oncor hynchus nerka) the stomach contents of 163 murres captured in the eastern Bering Sea and Bristol Bay during June-August, 1970 and 1971 were examined. Food organisms were mainly composed of larval and juvenile fishes and euphausiids followed by amphipods and squids. The fish identified to species included ; walleye pollock (Theragra chalcogramma), Pacific sandlance (Ammodytes hexapterus), capelin (Mallolus catervarius), juvenile sockeye salmon (Oncorhynchus nerka). Euphausiids were mostly Thysanoessa raschii and T. longipes. Amphipods such as Euthemisto libellula and Hyperia medusarum occurred very rarely. Fishes were the main food items making up the diet of murres, but the murres appeared to become plankton feeders when no other food was available. Ecologically, it appears that murres may influence the life of the juvenile sockeye salmon in two ways, one as a predator and the other as a competitor for food.View full abstractDownload PDF (1008K) -
Yoshitaka TSUBAKIArticle type: Article
1973 Volume 23 Issue 5 Pages 210-217
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSThe life table studies were carried out on the first and the second generations of Papilio xuthus population at Omura, Nagasaki. Natural and semi-natural (caged in the field) populations were used in order to detect the cause and the rate of mortality in each of the developmental stages, such as egg, five larval instars and pupa. The effect of predation was measured by comparing the two survival curves obtained from the caged (5 mm net) and the uncaged populations. By this treatment, it was made clear that small predators (spiders, etc.). attacked the young larvae and large predators (polistes wasps, etc.) attacked the later larvae. The high mortality rate during the later larval instars was mainly due to the predation. Egg mortality was mainly due to the egg parasite, Trichogramma dendrolimi. Three species of parasitic wasps, Pleromalus puparum, Trogus mactator, and Brachimeria obscurata emerged from the pupae. These egg and pupal parasites killed 24.3 per cent of the eggs and 83 per cent of the pupae in the first generation, though with only slight effect on the second generation. The difference in egg population density between the first (12.7 eggs per 10 plants) and the second generation (3.3 eggs per 10 plants) was partially explained by the difference in the mean fecundities of the adults. The mean fecundity per female was estimated as, M.F.=(L-length of pre-ovipositional period)×Mean number of eggs laid per day. The mean length of the adult life span (L) was given as follows, L=1/(1-K) where K is the daily survival rate of the adult under the natural condition, and K is given as the solution of the following equation, N'/N=K^α where N is the total number of adults in a generation and N' is the number of adults living longer than α days.View full abstractDownload PDF (904K) -
Masahiko OHSAWA, SHAKYA Puspa.Ratna, Makoto NUMATAArticle type: Article
1973 Volume 23 Issue 5 Pages 218-228
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSAn ecological survey of the natural and semi-natural vegetation in eastern Nepal was performed from August to December, 1971,along the river Arun. This report deals with the altitudinal zonation of the vegetation, especially the occurrence of the deciduous broad-leaved forest in the Sedua region, upper Arun. The Sedua region is one of the regions of highest rainfall in Nepal (more than 4000 mm/year). The characteristic feature of the altitudinal zonation of the forest vegetation in the humid Himalayas was the occurrence of deciduous broad-leaved forest zone in the cool-temperate region between 2500-2900 m in altitude. This zone is equivalent to the Fagus climax forest zone in the northern hemisphere and to the Tsuga dumosa-Quercus semecarpifolia evergreen forest zone in the central Himalayas. A description of these deciduous broad-leaved forests is given and their status among various forests of the same climatic zone in the Nepal Himalayas discussed.View full abstractDownload PDF (2116K) -
Article type: Appendix
1973 Volume 23 Issue 5 Pages 229-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
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Article type: Appendix
1973 Volume 23 Issue 5 Pages 229-236
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSDownload PDF (792K) -
Article type: Bibliography
1973 Volume 23 Issue 5 Pages Misc1-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
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Article type: Cover
1973 Volume 23 Issue 5 Pages Cover3-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSDownload PDF (33K) -
Article type: Cover
1973 Volume 23 Issue 5 Pages Cover4-
Published: October 20, 1973
Released on J-STAGE: April 11, 2017
JOURNAL FREE ACCESSDownload PDF (33K)
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