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Introduced Carabidae (Coleoptera) from Nova Scotia and Prince Edward Island: new records and ecological perspectives

Published online by Cambridge University Press:  02 April 2012

Christopher G. Majka ,
Joyce Cook  and
Susan Westby
Christopher G. Majka*
Affiliation:
Nova Scotia Museum of Natural History, 1747 Summer Street, Halifax, Nova Scotia, Canada B3H 3A6
Joyce Cook
Affiliation:
Carleton University, Department of Biology, 4690 CTTC Building, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6
Susan Westby
Affiliation:
Agriculture and Agri-Food Canada, 32 Main Street, Kentville, Nova Scotia, Canada B4N 1J5
*
1Corresponding author (e-mail: c.majka@ns.sympatico.ca).
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Abstract

Seven species of introduced Carabidae are newly reported in Nova Scotia and Prince Edward Island. Trechus quadristriatus (Schrank), Amara ovata (Fabricius), and Harpalus rubripes (Duftschmid) are newly recorded in Atlantic Canada as a whole. Possible modes of introduction of these species to the region are discussed. Several may have been introduced in association with dry ballast shipments. Some may have arrived via natural dispersion from neighbouring areas; others appear to have been present and undetected for a considerable time. The possible impact of such introductions is also discussed. Synanthropic environments have higher proportions of introduced species than relatively undisturbed, native habitats. Some adventive species do become widespread in native environments; however, negative impacts on native species may not be readily apparent.

Résumé

On signale sept espèces non indigènes de Carabidae pour la première fois en Nouvelle-Écosse et à l'Île-du-Prince-Édouard. Le Trechus quadristriatus (Schrank), l'Amara ovata (Fabricius) et le Harpalus rubripes (Duftschmid) sont signalés pour la première fois dans l'ensemble des provinces atlantiques du Canada. L'article aborde les voies d'introduction de ces espèces dans la région. Certaines espèces ont pu être introduites par le biais des matériaux secs utilisés pour le ballastage ou encore par voie de dispersion naturelle en provenance des régions avoisinantes, tandis que d'autres semblent avoir été présentes dans la région sans avoir été détectées pendant longtemps. L'article aborde également les conséquences envisageables de telles introductions. Les environnements synanthropiques décèlent de plus grandes proportions d'espèces non indigènes que ce que l'on pourrait normalement retrouver dans des habitats indigènes à l'état naturel. Certaines espèces adventives se répandent en effet dans des environnements indigènes, toutefois, les effets néfastes sur les espèces indigènes pourraient ne pas se révéler immédiatement.

Type
Articles
Information
The Canadian Entomologist , Volume 138 , Issue 5 , October 2006 , pp. 602 - 609
Copyright
Copyright © Entomological Society of Canada 2006

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