Rapid decline of endemic snails in the Ogasawara Islands, Western Pacific Ocean

Takashi Ohbayashi, Isamu Okochi, Hiroki Sato, Tsuyoshi Ono, Satoshi Chiba

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The distribution of Mandarina spp., endemic land snails (ground-dowelling ecotype species) of the Ogasawara (Bonin) Islands (Japan), was examined from the 1980's to the present in Chichijima and Hahajima islands. In Chichijima Island, M.mandarina has been rapidly declining since the 1990's in the northeastern area of the island. On the other hand, M. chichijimana has only slightly declined since the 1990's in the southern area of the island. In Hahajima Island since the 1990's, M. polita has slightly declined in the central area while M. ponderosa has been rapidly declining, and M. aureola has shown almost no decline in the southern area of the island. These circumstances offer evidence of the expansion of land snail predators (flatworms). Moreover, Chichijima and Hahajima islands differ in the pace of their respective decline, perhaps because of a predatory flatworm, Platydemus manokwari, used previously as a biological control agent abroad for the giant African snail, Achatina fulica, which only invaded Chichijima island in the 1990's. Reprinted from Ohbayashi T, Okochi I, Sato H, Ono T, Chiba S (2007) Applied Entomology and Zoology 42:479-485, with permission of the Japanese Society of Applied Entomology and Zoology.

Original languageEnglish
Title of host publicationRestoring the Oceanic Island Ecosystem
Subtitle of host publicationImpact and Management of Invasive Alien Species in the Bonin Islands
PublisherSpringer Japan
Pages27-33
Number of pages7
ISBN (Electronic)9784431538592
ISBN (Print)9784431538585
DOIs
Publication statusPublished - 2010 Jan 1

Keywords

  • Mandarina spp.
  • Ogasawara (Bonin) Islands
  • Platydemus manokwari
  • island biology
  • land snail decline

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)

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