Cost of autotomy drives ontogenetic switching of anti-predator mechanisms under developmental constraints in a land snail

Masaki Hoso*

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Autotomy of body parts offers various prey animals immediate benefits of survival in compensation for considerable costs. I found that a land snail Satsuma caliginosa of populations coexisting with a snaileating snake Pareas iwasakii survived the snake predation by autotomizing its foot, whereas those out of the snake range rarely survived. Regeneration of a lost foot completed in a few weeks but imposed a delay of shell growth. Imprints of autotomy were found in greater than 10 per cent of S. caliginosa in the snake range but in only less than 1 per cent out of it, simultaneously demonstrating intense predation by the snakes and high efficiency of autotomy for surviving snake predation in the wild. However, in experiments, mature S. caliginosa performed autotomy less frequently. Instead of the costly autotomy, they can use defensive denticles on the inside of their shell apertures. Owing to the constraints from the additive growth of shells, most pulmonate snails can produce these denticles only when they have fully grown up. Thus, this developmental constraint limits the availability of the modified aperture, resulting in ontogenetic switching of the alternative defences. This study illustrates how costs of adaptation operate in the evolution of life-history strategies under developmental constraints.

本文言語English
ページ(範囲)4811-4816
ページ数6
ジャーナルProceedings of the Royal Society B: Biological Sciences
279
1748
DOI
出版ステータスPublished - 2012
外部発表はい

ASJC Scopus subject areas

  • 生化学、遺伝学、分子生物学(全般)
  • 免疫学および微生物学(全般)
  • 環境科学(全般)
  • 農業および生物科学(全般)

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