환경생물 (Korean Journal of Environmental Biology)

  • 제33권4호
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  • Pages.419-424
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  • 2015
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  • 1226-9999(pISSN)
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  • 2287-7851(eISSN)
한국환경생물학회 (Korean Society of Environmental Biology)
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두꺼비 (Bufo gargarizans) 난소주기에 관한 연구

A Study on the Ovarian Cycle of Asian Toad (Bufo gargarizans)

  • 투고 : 2015.10.27
  • 심사 : 2015.12.08
  • 발행 : 2015.12.31
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초록

두꺼비 (Bufo gargarizans)의 난소주기를 파악하기 위해 암컷 성체를 대상으로 gonadosomatic index (GSI)와 난소 내 여포난자의 크기와 난황 축적 정도를 기준으로 발달과정을 연중 조사하였다. 4월에는 난소 무게와 GSI가 가장 낮게 나타났으며 모든 여포난자들은 난황 축적 전단계의 상태로 존재하여 난황 형성이 중단된 것으로 판단된다. 난소 무게와 GSI가 증가하기 시작한 5월의 난소에서는 난황 축적 전기단계의 여포난자가 출현하였고 6월에는 난황 축적 중기단계와 난황 축적 전단계의 여포난자가 존재하여 난소 무게와 GSI도 증가하여 나타났다. 이러한 현상은 이 시기에 난황 축적현상이 진행되는 것을 의미하며 난소 무게와 GSI가 급격히 증가하기 시작한 9월에는 난황 축적 중기단계의 여포난자들과 난황 축적이 거의 완성된 난황 축적 후기단계의 여포난자들이 존재하였다. 난황 축적을 마치고 성장이 완료된 여포난자들은 10월부터 일부 출현하기 시작하여 동면기인 12월에 급격히 증가하였으며 2월의 난소에서는 성장이 완료된 여포난자가 전체적으로 존재하여 여포난자의 성장기에는 난소 내의 모든 여포난자들이 동시적 (synchronized)으로 진행되지 않고 각각의 여포난자에 따라 진행되다가 배란시기에 성장이 완료된 상태를 유지하는 난소주기를 나타내었다.

In order to determine the ovarian cycle of Asian Toad, Bufo gargarizans, the developmental stage based on the gonadosomatic index (GSI), size of follicle oocytes in ovary and vitellogenesis for adult females were investigated all around the year. The weight of ovary and GSI were the lowest from April, and all follicle oocytes exist in the pre-vitellogenic form, indicating that the vitellogenesis was suspended. The follicle oocytes in early-vitellogenic stage appeared in ovary during may when the weight of ovary and GSI start to increased, and the follicle oocytes in mid-vitellogenic and pre-vitellogenic stages existed during June and the weight of ovary and GSI also increased. This indicates that vitellogenesis has been carried out actively during this period. The follicle oocytes in mid-vitellogenic stage and late-vitellogenic stage when the vitellogenesis was also completed existed on September. Post-vitellogenic follicle oocytes after vitellogenesis started to appear from October and rapidly increased from December in hibernation. The full grown follicle oocytes existed during February, indicating the ovarian cycle that all follicle oocytes in ovary are developed separately, not synchronized, during the growing period of follicle oocytes and the post-vitellogenic follicle oocytes are maintained the ovulation period.

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