Document Type

Peer-Review Article



A blacklight trap (LT) and a flight interception trap (FIT) were installed throughout the May-September period during four years (2014-2017), near a farm pond within an orchard at Compton, in southern Québec (Canada). We collected by LT 162,001 adults representing 560 beetle species and morphospecies belonging to 49 families, and using a FIT 10,159 individuals for 468 Coleoptera species belonging to 48 families. We observed a similarity of 9.8% between these two assemblages including 214 common species (26.3% of total of 814 caught taxa). We caught mainly nocturnal Carabidae, Hydrophilidae, Staphylinidae and Dryopidae in the LT, and primarily diurnal Nitidulidae and Staphylinidae in FIT. Generally, the maximal species richness was recorded during June-August in LT, and during May in FIT. The number of species occurring as singletons or doubletons over all sampling years were 202 (36.1% of species) in LT and 259 (55.3%) in FIT. Also, 283 species (50.5%) in LT and 332 species (70.9%) in FIT flew during 1-3 months only over 20 sampling months. In both traps, dominant and subdominant species represented together a large proportion of catches in spite of strong year-to-year fluctuations in the relative abundance of species. It is important to evaluate the rarity of a species with complementary sampling methods over many years. We studied also the seasonal flight pattern for the 31 most abundant species in LT and for seven abundant species in FIT; the flight peak of many nocturnal species was in July and/or August, whereas six species collected in FIT flew mainly in early season (May-July). The pattern of flight period was different in LT and FIT for the cryptophagids Atomaria ephippiata Zimmermann and A. fuscata Schönherr, and for the throscid Trixagus chevrolati (Bonvouloir). We determined the sex-ratio for 31 abundant species; 17 species presented a female-biased sex-ratio.

Included in

Entomology Commons



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