An invasion from Germany: Deroceras invadens (Pulmonata: Agriolimacidae) and other synanthropic slugs in the southwest corner of Poland

John M. C. Hutchinson, e-mail: majmch@googlemail.com

Senckenberg Museum für Naturkunde Görlitz, Am Museum 1, 02826 Görlitz, Germany

Heike Reise

Senckenberg Museum für Naturkunde Görlitz, Am Museum 1, 02826 Görlitz, Germany
Abstract

Ten towns in the southwest corner of Poland within 57 km of the German border were surveyed for slugs. Deroceras invadens was found only in the four westernmost towns. In Zgorzelec, which was surveyed more intensively than the other towns, it occurs widely but only sporadically. Although D. invadens had been known in the adjacent German town of Görlitz since 1991, hitherto the only Polish record was from Wrocław, 140 km to the east. This pattern suggests a new colonisation across the border. Amongst the other species, one surprise was the rarity of Deroceras reticulatum in several towns, and another that Arion fuscus was common in one town but not found in any of the others. Records of Deroceras praecox extend its known range in Poland further west. Contrary to expectations from the literature, Deroceras sturanyi was adult in spring and reproducing at a small size typical of Deroceras laeve.

Key words
invasive species; urban fauna; Arion distinctus; A. fasciatus; A. fuscus; A. lusitanicus; A. rufus; A. silvaticus; Boettgerilla pallens; Deroceras laeve; D. invadens; D. praecox; D. reticulatum; D. sturanyi; Limacus flavus; Limax maximus; Oberlausitz; Lower Silesia; Dolny Śląsk; life cycle
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Folia Malacologica (2015) 23: 301-307
First published on-line: 2015-11-16 00:00:00
http://dx.doi.org/10.12657/folmal.023.026
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