Authors: Elizabeth A Bergey Laura L Figueroa Charles M Mather Rebekah J Martin Eric J Ray Jobin T Kurien David R Westrop Phushewan Suriyawong
Publish Date: 2013/11/23
Volume: 16, Issue: 7, Pages: 1441-1451
Abstract
The plant trade provides a major mechanism for the longdistance dispersal of land snails including slugs which have low natural mobility Whereas inspections at national borders intercept many incoming snails dispersal within countries is much less well regulated and documented To investigate the role of plant nurseries as a source for the distribution of nonnative invertebrates particularly land snails we surveyed snails in 28 nurseries in Oklahoma United States and compared our survey with similar surveys worldwide We found 36 taxa including 16 species not native to the region 11 of these were new state records Snail species richness increased with increasing outside area of snailappropriate habitat but not with enclosed greenhouse area Species composition was similar among nurseries and Oklahoma nurseries shared several species with nurseries in Hawaii and Europe Appropriate models for the dispersal of snails via plant nurseries are the transport hub model snails moving as contaminants on plants coming into and leaving nurseries and for snail populations already established in nurseries the stratified diffusion model contamination of plants by snails within nurseries followed by longdistance jumps as plants are sold and transported Potted plants are portable habitats that protect snails from detection pesticides and desiccation Dispersing snails may survive in urban habitats where mulching and watering may ameliorate hot dry summers and cold wintersWe thank all the nursery owners and staff who allowed access and advised on locations to search Lisa Price Lainie Zarones and Eric Bright helped with fieldwork We thank Authur E Bogan Jamie M Smith and Aaron T Edwards for taxonomic help Comments from Eric Bright and anonymous reviewers improved the manuscript Funding was provided by the Oklahoma Biological Survey and the University of Oklahoma’s Honors Research Assistant Program
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