Biology and conservation of the rare New Zealand land snail Paryphanta busbyi watti (Mollusca, Pulmonata)

Stringer, IAN, Bassett, SM, McLean, MJ, McCartney, J and Parrish, GR (2003) Biology and conservation of the rare New Zealand land snail Paryphanta busbyi watti (Mollusca, Pulmonata). Invertebrate Biology, 122 3: 241-251.

Author Stringer, IAN
Bassett, SM
McLean, MJ
McCartney, J
Parrish, GR
Title Biology and conservation of the rare New Zealand land snail Paryphanta busbyi watti (Mollusca, Pulmonata)
Journal name Invertebrate Biology   Check publisher's open access policy
ISSN 1077-8306
Publication date 2003
Sub-type Article (original research)
Volume 122
Issue 3
Start page 241
End page 251
Total pages 11
Place of publication Lawrence, USA
Publisher American Microscopical Society
Collection year 2003
Language eng
Subject C1
270504 Invertebrate Biology
770704 Control of pests and exotic species
Abstract The biology of Paryphanta busbyi watti, an endangered carnivorous land snail, was studied mostly by following large juvenile and adult snails with harmonic radar. The snails are nocturnally active and most (79%) hide during the day under leaf litter or in dense vegetation. Fecal analysis showed that the diet is primarily earthworms, but some cannibalism of smaller snails occurs. Empty shells appear to be an additional source of dietary calcium. Mating occurred most frequently between April and July. Mating snails stayed together for 4-7 days, and each pair reversed their positions at least twice. Four snails were first found mating 151-1240 d after they acquired adult shells, and 7 snails were observed mating a second time after 66-298 d. We found 8 nests and observed 6 snails ovipositing; 5 snails laid eggs in holes they dug and one laid eggs in a crevice between rocks. In 2 instances, oviposition was recorded 52 and 140 d after mating. Snails were estimated to lay on average similar to17.5 eggs per year in 3-5 clutches. Most oviposition was observed in August/September, but some occurred between November and February. Of the snails that died, pigs killed 13.6% and humans inadvertently killed another 13.6%. Other snails died from unknown causes mostly during the drier and warmer months, from November to April. This large land snail survives in the presence of introduced predators, but some life history traits could predispose it to a rapid decline in numbers if new predators arrive.
Keyword Zoology
Behavior
Harmonic Radar
Northernmost New-zealand
Placostylus-ambagiosus
Bulimulidae
Growth
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Wed, 15 Aug 2007, 02:12:48 EST