Moluscos em área de horticultura no município de Porto Alegre, Rio Grande do Sul, Brasil

Horticultural production areas are favorable to development and maintenance of land mollusks populations. To know the mollusk fauna diversity in that kind of production area a research project was conduced in a rural-urban district of Porto Alegre, Rio Grande do Sul, Brazil. The production property studied is located in the Southern zone of the city and has 17 ha of cultivated area. The sampling period was from August/2000 to August/2001, with monthly quantitative collects on the different culture production beds previously selected. Six taxa were registered: Deroceras leave (Müller, 1774) (1.389 specimens = 82,82%), Bradybaena similaris (Férussac, 1821) (195 specimens = 11,7%), Succinea meridionalis d'Orbigny, 1846 (82 specimens = 4,9%), Lamellaxis gracilis (Hutton, 1834) (03 specimens = 0,17%), Bulimulus (Bulimulus) vesicalis angustus Weyrauch, 1966 (05 specimens = 0,3%) and Megalobulimus abbreviatus (Bequaert, 1948) (02 specimens = 0,11 %), only the last two being natives