ALIEN INVASION: THE STATUS OF NON-NATIVE LADY BEETLES (COLEOPTERA: COCCINELLIDAE) IN INDUSTRIAL CAPE BRETON, NOVA SCOTIA
2000; Eagle Hill Institute; Volume: 7; Issue: 3 Linguagem: Inglês
10.1656/1092-6194(2000)007[0241
ISSN1938-5307
AutoresC. M. Cormier, T. A. Forbes, Trevor A. Jones, Robert Morrison, D. B. McCorquodale,
Tópico(s)Insect Pest Control Strategies
ResumoFour species of non-native coccinellids in North America have expanded their ranges to include Cape Breton Island, Nova Scotia in the past 20 years. Lady beetles were sampled in 1998 at five sites in industrial Cape Breton to determine the status of these four non-native species. Coccinella septempunctata L. has been established for about 15 years and was the most common coccinellid in Cape Breton during the past 10 years. It continues to be one of the most common and widespread species. The other three are very recent, mid-1990s, introductions to this area. Harmonia axyridis (Pallas) has apparently not become established. Two others, Propylea quatuordeci-mpunctata (L.) and Hippodamia (Adonia) variegata (Goeze), are now common and widespread. The latter is particularly abundant, especially in the late summer. Native species were rarely encountered; the most frequent, Coccinella trifasciata, made up less than 4% of all individuals. During the past ten years, Adalia bipunctata L. has been the most abundant native species. However, only two individuals were observed during 40 hours of sampling in 1998, possibly indicating a major decline.
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