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Volume 47 (1998)
- Issue 2 Pages 79-
- Issue 1 Pages 1-
Volume 47, Issue 1
Displaying 1-9 of 9 articles from this issue
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Hajime Yoshida, I-Min Tso, Lucia Liu Severinghaus1998 Volume 47 Issue 1 Pages 1-5
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSA new species, Argyrodes lanyuensis of the family Theridiidae is described from Orchid Island, Taiwan. The ecology and behavior of the new species are reported.View full abstractDownload PDF (469K) -
Habitat Preference Observed by Hand-sortingYasuhiro Fujii1998 Volume 47 Issue 1 Pages 7-19
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSWolf spiders (Araneae: Lycosidae) of 19 species were collected by hand-sorting in a northwest area of Kanto Plain, Japan, and their habitat preferences were inferred from their frequency in 10 habitats classified by three environmental elements (substrata, light, water). In addition to the 12 species surveyed by trapping (Fujii 1997), the hand-sorting enabled to examine the other seven species, Alopecosa virgata, Arctosa depectinata, A. subamylacea, Lycosa coelestis, Pardosa pseudoannulata, P. yaginumai, and Pirata subpiraticus, and to know more accurate preference of Pardosa agraria, P. astrigera, Pirata clercki, and P. piratoides. The interspecific differences were large within each genus, but were not found between Arctosa ebicha and A. fujiii and between Pirata procurvus and P. tanakai. Partial overlap was also detected among the preferences of other several Pardosa or Pirata species. The differences among the developmental stages were not obvious.View full abstractDownload PDF (1366K) -
Akio Tanikawa1998 Volume 47 Issue 1 Pages 21-26
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSThe spider genus Spheropistha Yaginuma, 1957 is newly synonymized with the genus Argyrodes Simon, 1864. A new species of the genus is described from Japan. It can be easily separated from the closely related Argyrodes melanosoma (Yaginuma, 1957), comb. nov. by general appearance.View full abstractDownload PDF (568K) -
Claire K. Cartan, Tadashi Miyashita1998 Volume 47 Issue 1 Pages 27-30
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSWebs of Nephila clavata living in Okinawa, a sub-tropical region of Japan, were found to be significantly smaller and to have less number of radii and spirals than those seen in temperate Tokyo. According to recent papers, a web is thought to get smaller when prey is abundant (Sherman 1994), or before molting and egg-laying (Higgins 1990), but none of these explain web reduction in Okinawa. We propose an alternative explanation: the necessity of the spider to adjust its life cycle to a sub-tropical climate.View full abstractDownload PDF (354K) -
Tadashi Miyashita, Tadashi Fukami, Aya Shimazaki1998 Volume 47 Issue 1 Pages 31-36
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSSpiderlings of the orb-weaver Nephila maculata frequently build webs on a large leaf surface such as Farfugium japonicum. In our observations and removal experiment, the spiderlings showed (1) uniform distribution with respect to leaves, i.e., one spider a leaf, (2) high preference for “deep” leaves which were limited, and (3) higher immigration rate onto leaves from which spiders were removed. These provide evidence of intraspecific competition for web-sites, a phenomenon rarely reported in orb-web spiders.View full abstractDownload PDF (465K) -
Hiroyoshi Ikeda1998 Volume 47 Issue 1 Pages 37-43
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSA new salticid spider species, Laufeia sasakii sp. nov. is described on the basis of the materials obtained from Tokunoshima Island, Kagoshima Pref., Japan. Another species of the same genus, Laufeia aenea Simon, 1889, is redescribed.View full abstractDownload PDF (669K) -
Yoshinori Yamamoto1998 Volume 47 Issue 1 Pages 45-52
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSTwo species belonging to the genus Malaconothrus were described from Sichuan Province in the western part of China. Malaconothrus marginatus sp. nov. is very similar to Malaconothrus japonicus Aoki, 1966 from Gunma Prefecture, central Japan, but is distinguishable from the latter by having small and slender body, long interlamellar setae, protrudent lateral margin of notogaster, 5 pairs of genital setae, short adanal setae. Malaconothrus pygmaeus Aoki, 1969 was originally described from IBP (International Biological Programme) area of Nagano Prefecture, central Japan, and later reported by Wang & Norton (1988) from Jilin and Hubei Province in China.View full abstractDownload PDF (601K) -
Akira Shinkai1998 Volume 47 Issue 1 Pages 53-57
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSMenosira ornata was found to have two types of web. One was a normal horizontal tetragnathid web and the other was a specialized web consisting of only radii. The early juveniles were found on the normal horizontal web, but the late juveniles and matures constructed the specialized web. The predatory behavior on the specialized web was also observed. Most of the prey were tipulidid flies and spiders. M. ornata directly captured flying insects approaching the web, or captured the spider walking on a radial thread.View full abstractDownload PDF (408K) -
Jun-ichi Ogula1998 Volume 47 Issue 1 Pages 59-68
Published: 1998
Released on J-STAGE: March 29, 2007
JOURNAL FREE ACCESSIt has long been stressed that food web study is important, but we know little about it. Properties of the structure of food webs are not obvious, while functional properties of webs are now getting clear through a few studies published recently. In particular, terrestrial systems containing spiders contribute to the progress of food web study and provide some new concepts.View full abstractDownload PDF (1111K)
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