人為的に寄生処理を施した関東産イシガイ幼生の宿主としてのオオクチバスとウシガエルの不適合

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  • Two Alien Species, Largemouth Bass and Tadpole of American Bullfrog, Are Unsuitable Hosts for the Glochidia of the Freshwater Unionid Mussel <i>Unio douglasiae nipponensis </i>in the Kanto Area, Central Japan
  • ジンイテキ ニ キセイ ショリ オ ホドコシタ カントウサン イシガイヨウセイ ノ シュクシュ ト シテ ノ オオクチバス ト ウシガエル ノ フテキゴウ

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Here, we examined the suitability of the largemouth bass, Micropterus salmoides; common freshwater goby, Rhinogobius spp. (Rhinogobius sp. OR); and tadpoles of the American bullfrog, Rana catesbeiana as hosts for glochidia of the freshwater unionid mussel Unio douglasiae nipponensis. The hosts, to which the glochidia were attached for 2 h (density of glochidia: 500–1000 individuals/L), were cultured in tanks (6 L, 28 ± 0.5°C) for 16 days. The glochidia and juveniles that became detached from the hosts were counted daily. The juveniles appeared for 7 to 15 days after the glochidia became attached to the goby. Therefore, Rhinogobius spp. was apparently a suitable host on which over 74% of the attached glochidia metamorphosed to juveniles. However, only dead glochidia were observed between the first and forth days for the largemouth bass, and neither glochidia nor juveniles were observed for the American bullfrog. These alien species were apparently unsuitable hosts for U. douglasiae nipponensis.

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