The Natural Environmental Science Research

Tardigrade living in sewage treatment plants

Kazuo UTSUGI

2005 Volume 18 Pages 1-8
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_1

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It is well known that some tardigrades are found in the aeration tanks of sewage disposal plants. These tardigrades are generally called 'Macrobiotus' and coexist with the various types of bacteria, fungi, protozoans, rotifers, and other organisms that are presumably beneficial to wastewater treatment.
Activated sludge samples were obtained from several sewage disposal plants in Tokyo and other areas and examined for the occurence of tardigrades. The same species was observed from all samples, although the frequency of tardigrade varied depending on the region and the condition of activated sludge. Many exuviae with eggs and embryos were concurrently found in the activated sludge. Morphological observations of their mouth apparatus, eyespot, and double-claws showed the present species was not as 'Macrobiotus', but one of the aquatic tardigrades, Isohypsibius myrops (Du Bois-Reymond Marcus, 1944).
This species seems to live and reproduce in sewage aeration tanks as a scavenger.

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Occurrence of Echinochaete ruficeps at Mt. Yoshida, Kyoto

Sho-ichi TSUJIYAMA, Komako TSUJTYAMA

2005 Volume 18 Pages 9-13
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_9

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A tropical white rot basidiomycete Echinochaete ruficeps (Berk. & Br.) Ryvarden, which had been rarely found in Japan, continuously apperared at Mt. Yoshida, Kyoto. This fungus occurred from May to September, when temperature rose up to 25 ℃ and above. An increasing number of fruit-bodies have been observed in the last four years. Furthermore, the fruit-bodies were found in other areas of the Kinki region. This suggests that there are E. ruficeps colonies in Kyoto and its surroundings.

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Differences in behavior of Japanese field mouse Apodemus speciosus toward acorns of four Fagaceae species

Tomomichi KOBAYASHI, Satomi HATANO

2005 Volume 18 Pages 15-20
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_15

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Behaviors of a Japanese field mouse, Apodemus speciosus, toward acorns of four Fagaceae species, Quercus serrata, Q. acutissima, Q. myrsinaejolia and Castanopisis cuspidate, were examined. Particularly, the mouse's acorn hoarding behavior was observed. The experiment was performed in a naturalistic indoor room where we could judge how the mouse dealt with acorns. The responses by the mice to acorns of four species were different. The mice hoarded more Q. serrata and Q. acutissima acorns underground than Q. myrsinaefolia and Castanopisis acorns. They ate Q. myrsinaefolia acorns most. The results suggest the possibility that the four Fagaceae species adopted different evolutional strategies about utilization of the mice.

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Bryophytes of Mt. Makuyama and adjacent areas, Kanagawa, Japan

Teruyo HIRAOKA, Sumiko ISONO, Shigeko SASAKI, Showzabroh HIRAOKA

2005 Volume 18 Pages 21-40
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_21

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137 species of moss, 80 species of liverwort, and 2 species of hornwort were recorded from approximately 900 specimens collected from Mt. Makuyama and adjacent volcanic areas, south of Hakone, Kanagawa. Taxa of phytogeographic interest include Theriotia kashimirensis, Fissidens geppii, Campylostelium brachycarpum, Schistostega pennata, and Cololejeunea trichomanis.

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Notes on Japanese Lycoperdaceae

日本産ホコリタケ科知見

Taiga KASUYA

2005 Volume 18 Pages 41-46
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_41

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Five species and one variety of the genus Calvatia (Lycoperdaceae) deposited in the herbarium of Hiratsuka City Museum, Japan, are reported: Calvatia boninensis, C. candida, C. craniiformis, C. cyathiformis, C. utriformis, and C. utriformis var. hungarica. Among these species, C. candida and C. utrifonnis var. hungarica are newly recorded from Japan. A key to the species of the genus Calvatia is provided.

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Bryophytes of the Sukumo-gawa (river), Hatajuku, Hakone, Kanagawa, Japan

Shigeko SASAKI

2005 Volume 18 Pages 47-59
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_47

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An investigation of brophytes was conducted at the Sukuumo-gawa (river) and adjacent area, Hatajuku, Hakone, Kanagawa, Japan, from January to May, 2005. Total 88 species of moss, 56 species of liverwort, and one species of hornwort were recognized from approximately 320 specimens collected. Taxa of phytogeographic interest included Diphyscium lorifolium, Campylostelium saxicola, Fissidens nobilis, Pallavicinia ambigua, Hygrobiella nishimurae, and Megaceros flagellaris.

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Bryophytes of Takasuna-Ryokuchi, Chigasaki, Kanagawa, Japan

Junko ISHII, Kazue KURAMAE

2005 Volume 18 Pages 61-66
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_61

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Food habit and foraging activity of Japanese Green Pigeon, Sphenurus sieboldii (preliminary report)

Susumu OSAWA, Morio URANO, Mana KOSUGI

2005 Volume 18 Pages 67-71
Published: December 10, 2005
Released on J-STAGE: December 25, 2024

DOIhttps://doi.org/10.32280/nesr.18.0_67

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Feces of Sphenurus sieboldii collected in Terugasaki coast in Oiso, Kanagawa are in the process of being analyzed. Results of the partial analysis are outlined along with photographs.

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