Journal of the Acarological Society of Japan
Online ISSN : 1880-2273
Print ISSN : 0918-1067
ISSN-L : 0918-1067
Volume 17, Issue 2
Displaying 1-5 of 5 articles from this issue
Original Papers
  • Genichi KURIKI
    2008 Volume 17 Issue 2 Pages 75-85
    Published: November 25, 2008
    Released on J-STAGE: December 26, 2008
    JOURNAL FREE ACCESS
    Some aspects of the life cycle of Limnozetes ciliatus, the dominant oribatid species in a Sphagnum mire at Yachidaira, Northeast Japan, were surveyed using laboratory cultures and field surveys. Reproductive characteristics, ontogenetic development and release of faecal pellets by the adults were investigated. This species is oviparous and laid a maximum of 11 eggs (mean 3.4) one by one at 25°C in a life cycle. Fewer eggs were laid at 15°C and 20°C. During ontogenetic development, the number of pair of notogastral setae and genital setae changed as follows: 12-15-15-15-10 (pairs) and 0-2-4-6-7 (pairs), respectively. The adult deposited many faecal pellets under pieces of decayed tissues of Moliniopsis japonica; the largest at 25°C with a maximum of 1,528 faecal pellets (0.195 mm3 in volume) per animal within a lifetime of 150 days. Fewer faecal pellets were released at 15°C and 20°C. The results suggest that this species is an important decomposer in this habitat where there are few macrodecomposers, and shows a clear difference in metabolic rate between 20°C and 25°C.
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  • Yousuke OHZORA, Shuichi YANO
    2008 Volume 17 Issue 2 Pages 87-92
    Published: November 25, 2008
    Released on J-STAGE: December 26, 2008
    JOURNAL FREE ACCESS
    We examined the hypothesis that sons of fertilized and unfertilized mothers of Tetranychus urticae Koch differ in some life history traits. Sons of fertilized and unfertilized mothers did not differ in developmental period regardless of mother’s presence during the juvenile phase. Moreover, dispersal capacity also did not differ between the two groups of males. However, sons of unfertilized mothers guarded immature females earlier than did sons of fertilized mothers, which should reflect the different probabilities of encountering mates.
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  • Mohammad Ali AKRAMI, Luis S. SUBÍAS
    2008 Volume 17 Issue 2 Pages 93-99
    Published: November 25, 2008
    Released on J-STAGE: December 26, 2008
    JOURNAL FREE ACCESS
    Two new species of oribatid mites belonging to subfamily Multioppiinae Balogh, 1983 of the family Oppiidae Sellnick, 1937, Ramusella (Insculptoppia) iranica n. sp. and Ramusella (Rectoppia) damavandica n. sp., are described from Iran.
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