Distribution of oviposition sites and environmental characteristics around these sites of Tokyo salamander, <i>Hynobius tokyoensis</i>, at paddy fields of valley bottom in northeast region of Chiba Prefecture.

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  • NATSUMEDA Takaharu
    <I>Faculty of Risk and Crisis Management, Chiba Institute of Science</I>
  • OHGI Tomoya
    <I>Faculty of Risk and Crisis Management, Chiba Institute of Science</I>

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  • 千葉県北東部の谷津田におけるトウキョウサンショウウオ <i>Hynobius tokyoensis</i> の産卵場の分布及びその周辺環境
  • 千葉県北東部の谷津田におけるトウキョウサンショウウオHynobius tokyoensisの産卵場の分布及びその周辺環境
  • チバケン ホクトウブ ノ タニ ツダ ニ オケル トウキョウサンショウウオ Hynobius tokyoensis ノ サンランジョウ ノ ブンプ オヨビ ソノ シュウヘン カンキョウ
  • Distribution of oviposition sites and environmental characteristics around these sites of Tokyo salamander, Hynobius tokyoensis, at paddy fields of valley bottom in northeast region of Chiba Prefecture.

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Abstract

We surveyed the distribution of oviposition sites and environmental characteristics around these sites of Tokyo salamander (Hynobius tokyoensis) at paddy fields of valley bottom in northeast region of Chiba Prefecture in 2012. Fifty oviposition sites were detected from mid-March to late-April. The number of egg sacs found in each oviposition site ranged from 1 to 52 (9.4 egg sacs on average), and small-scale oviposition sites, which had less than 10 egg sacs, shared over 70% of the total number of oviposition sites. Generalized linear model(GLM) analysis based on six variables related to landing of adults and larva after metamorphosis (canal width, water depth, sediment depth，distance to forest on slope, canal bank slope, and area of oviposition site), indicated that distance to forest on slope had a negative significant effect on their egg-sac number. Our results suggest the importance of spatial connectivity between oviposition sites and ordinary habitat for adults and larvae after metamorphosis( i.e. forest on slope) at micro spatial scale that allows the viability of Tokyo salamander population.

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