Variation of Egg Clutches in the Giant African Snail, Achatina fulica (Ferussac) (Stylommatophora : Achatinidae) in Ogasawara Islands

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  • 小笠原諸島におけるアフリカマイマイ Achatina fulica (Ferussac) の卵サイズの変異
  • 小笠原諸島におけるアフリカマイマイAchatina fulica(Ferussac)の卵サイズの変異〔英文〕
  • オガサワラ ショトウ ニ オケル アフリカマイマイ Achatina fuli

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Abstract

The giant African snail, Achatina fulica (Ferussac), was introduced into and is now abundant in Ryukyu and Ogasawara Islands, Japan. Its clutch size varied from 13 to 137, and egg volume from 35 to 85 mm^3. There was no significant difference in clutch size or egg volume by season and by locality. The clutch size and egg volume were positively correlated with the shell lengths of parents. Snails with reproductive organs were divided into three age groups ; viz. "young-adult", "intermediate", and "old-adult", according to degree of peristome thickness. No "young-adult" had eggs. The "old-adult" produced larger clutches and eggs than the others. It was concluded that A. fulica had a great variability in reproductive performance.

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