Acta Arachnologica
Online ISSN : 1880-7852
Print ISSN : 0001-5202
ISSN-L : 0001-5202
Volume 64 , Issue 2
Showing 1-6 articles out of 6 articles from the selected issue
  • Takuya Nagasawa, Hiroshi Abé
    2015 Volume 64 Issue 2 Pages 71-73
    Published: December 31, 2015
    Released: January 02, 2016
    Prostigmatid aquatic mites are known to temporarily live on the surface of aquatic insects in their life cycle. We collected imaginal aquatic insects by hand-sweeping and a light trap on mountain streams in Shizuoka and Kanagawa prefectures in Japan to clarify the parasitic nature of aquatic mites on them. During the survey, 16 genera in 13 families of Trichoptera, four genera in two families of Plecoptera, and three genera in two families of Diptera were recorded as host insects of aquatic mite genera Protzia, Partnunia, Stygomomonia, and Lebertia in Hydrachnidiae and Stygothrombium in Stygothrombiae. Trichoptera was newly recorded as a host taxon of aquatic mites in Japan. The diversity of host insect taxa for Protzia was greater than that for the other four mite genera. The host-parasite correspondence between mite and host insect taxa was generally consistent with the results so far obtained.
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Rearing method
  • Yusuke Shigemiya, Kensuke Nakata
    2015 Volume 64 Issue 2 Pages 75-81
    Published: December 31, 2015
    Released: January 02, 2016
    Rearing of animals from one generation to the next is important in many biological studies. In this study, we aimed to develop efficient methods for rearing multiple generations of orb-web spiders (Cyclosa argenteoalba), testing three methods. First, we examined isolated rearing with aphid supplied by hand. Second, we tested mass rearing. We also collected various insect species from the field using light trap and supplied them by hand. Both methods failed, perhaps because of the inappropriate aphid (Uroleucon formosanum) and insufficient quantity of prey supplied in the first and second tests, respectively. For the third method, we mass reared with abundant prey directly supplied from light traps into the terrariums located outside. This method successfully raised hatchlings to adults, and the eggs produced from these adults also matured. The development time of wintering and non-wintering cohorts was 150.2‐195.0 days and 24.0‐76.3 days, respectively.
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