Relations of intraspecific variations in fecundity, clutch size, and oviposition frequency to the body size in three species of stoneflies, Sweltsa sp., Isoperla aizuana, and Stavsolus japonicus |
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Authors: | Mayumi Yoshimura |
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Institution: | (1) Forest Conservation and Management Group, Shikoku Research Center, Forestry and Forest Products Research Institute, 2-915 Asakura-Nishimachi, Kochi, 780-8077, Japan |
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Abstract: | Most stoneflies oviposit several times during their adult stage. In this study, the relations among oviposition frequency, the number of eggs per egg mass, and body size were examined in the chloroperlid stonefly Sweltsa sp. and two perlodid stoneflies, Isoperla aizuana and Stavsolus japonicus. It was found that larger individuals tended to oviposit more frequently than smaller ones, but the relation was significant only in Isoperla aizuana. In Sweltsa sp. and Isoperla aizuana, the number of eggs per egg mass was higher for the less-frequently ovipositing individuals than for those ovipositing more frequently, and the number of eggs per egg mass decreased with successive oviposition events. Stavsolus japonicus showed the same tendency but it was not statistically significant. |
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Keywords: | Plecoptera Sweltsa Isoperla Stavsolus Egg number Oviposition frequency Oviposition sequences |
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