Découverte de la cordulie tricoteuse (Somatochlora filosa) au Canada et reconsidération de la cordulie linéaire (Somatochlora linearis) au Québec, deux espèces rhéophiles de libellules

Abstract

La pêche d’une naïade de la cordulie tricoteuse (Odonata : Corduliidae : Somatochlora filosa), le 7 septembre 2016 à Sainte-Catherine-de-Hatley, en Estrie, au Québec, représente une première mention de l’espèce au Canada. Fort méconnu, l’habitat de reproduction de cette espèce est rapporté pour la deuxième fois en Amérique du Nord. La découverte inattendue de cette population relique, isolée de 575 km au nord de son aire de répartition connue, soulève un questionnement sur la composition originelle de l’odonatofaune de la sous-zone de la forêt décidue du Québec, la plus perturbée depuis la colonisation et l’exploitation du territoire par les humains pour ses ressources naturelles. De plus, la cordulie linéaire (S. linearis) est ramenée dans la liste des espèces d’odonates du Québec, sur la base de l’authentification du spécimen capturé en 1877 par l’abbé Léon Provancher. Trois autres espèces rhéophiles de cordulies pourraient habiter les sources et les ruisseaux forestiers du sud de la province.The collection of a nymph of the fine-lined emerald (Odonata: Corduliidae: Somatochlora filosa) on September 7, 2016 in Sainte-Catherine-de-Hatley, in the Estrie region of Québec, provides the first record of this species for Canada. The breeding habitat of the fine-lined emerald in North America is poorly known, and is reported here for only the second time. The unexpected discovery of a relic population, 575 km north of its previously known range, raises questions concerning the original composition of the odonatological fauna of the hardwood forest subzone of Québec – an ecosystem that has been considerably altered since human colonization of the area and the exploitation of natural resources. In addition, during the present study, the mocha emerald (S. linearis) specimen collected by Léon Provancher in Saint-Hyacinthe in 1877 was authenticated, and the species reinstated to the list of Odonata of Québec. Finally, it is suggested that 3 other rheophilic emerald species could inhabit forest springs and streams in the southern part of the province

The Dragonflies and Damselflies (Insecta: Odonata) of Canada: species list, geographical distribution, status, and conservation ranks

“…Somatochlora linearis. Savard et al (2017) authenticate the occurrence of this species from a teneral female specimen collected in 1877 by Léon Provancher at Saint-Hyacinthe in the region of Montérégie. The species has not been found recently at the Provancher site (which is now heavily disturbed by human activities) and is possibly extirpated from the province of Québec.…”

“…In 2020, the list had grown to 219, but this included the three alien species mentioned earlier that were detected in Québec, so the actual number should have been 216. However, Cannings (2019), in his overview of the Canadian fauna, gave the number as 214, having inadvertently missed the record of Somatochlora filosa (Savard et al 2017) and omitting Stylurus plagiatus (see note under "Species Retained in the Canadian List"). The texts and tabular databases (i.e, provincial/territorial species lists, and status ranks for each species) for these reports are available at Canadian Endangered Species Conservation Council (2016a, b;2022a, b).…”

“…Somatochlora filosa (Hagen) (Fine-lined Emerald / La cordulie tricoteuse). Savard et al (2017) record the collection of a female naiad collected by Majella Larochelle on 7 September 2016 at Sainte-Catherine-de-Hatley, in the region of Estrie, province of Québec; an adult emerged ten days later (Fig. 6).…”

New Population of the Rare Dragonfly Ophiogomphus howei (Odonata: Gomphidae) in Southern Michigan, United States

“…Landscapes are noted as being ‘forested’ and relatively ‘undisturbed’ with ‘minimal’ agriculture. Surveys of rivers that meet these criteria in states and provinces where O. howei has been found ( Nikula 2002 , White et al 2010 , Hamill 2013 , COSEWIC 2018 ) or where it is presumed they could occur ( Wagner and Thomas 1999 , Klymko 2010 , Olcott 2011 , ODS 2019 , Pfeiffer et al 2019 , Savard 2019 ) have often failed to locate any individuals. This localized and patchy distribution and the apparently narrow habitat requirements has led Ophiogomphus howei to be designated as a habitat specialist ( Kennedy and White 1979 , White et al 2010 , COSEWIC 2018 ).…”

The Ouellet-Robert Entomological Collection: new electronic resources and perspectives

“…The label data associated with the Odonata museum objects were electronically recorded in another FileMaker Pro relational database, each object being given a unique identifier label. The taxonomic nomenclature was updated using recent checklists (Garrison and von Ellenrieder 2016; Paulson and Dunkle 2018; Savard 2018). North American collection geoposition coordinates were found retrospectively using the Canada Geographical Names Database at Natural Resources Canada and the Geographic Names Information System at the United States Geological Survey.…”