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Occurrence and habitat of the endangered white flower moth, Schinia bimatris (Lepidoptera: Noctuidae), in Manitoba

Published online by Cambridge University Press:  02 April 2012

A. Richard Westwood*
Affiliation:
Department of Biology, University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba, Canada R3B 2E9
Christopher P. Friesen
Affiliation:
Manitoba Conservation Data Centre, Wildlife and Ecosystem Protection Branch, Manitoba Conservation, 200 Saulteaux Crescent, Winnipeg, Manitoba, Canada R3J 3W3
*
1Corresponding author (e-mail: [email protected]).

Abstract

The only known Canadian population of the white flower moth, Schinia bimatris Harvey, a federally listed endangered species, was rediscovered in 2003 in the dune area of Spruce Woods Provincial Park and Canadian Forces Base Shilo in Manitoba. Little is known about the biology or habitat requirements of this moth in North America. The dune area in Manitoba was surveyed for adult and immature stages of the species during July 2007 using light traps and daytime visual searches. A detailed vegetation survey was also completed in areas where moths were active. Whereas individuals caught in light traps were predominantly males, both females and males were observed to be very active during daylight hours. This is the first record of diurnal activity of the white flower moth in Canada. Adults were observed flying above dune crests and also resting on vegetation between open dunes. Although the current population appears robust, given the number of adults observed, a previous population approximation of up to 5000 individuals may be an overestimate because sand-dune habitat is limited. We were unable to locate immature stages or determine which host plant(s) were utilized by larvae.

Résumé

La seule population canadienne connue de l’héliotin blanc satiné, Schinia bimatris Harvey, qui figure au répertoire des espèces menacées, a été redécouverte en 2003 dans la zone des dunes du parc provincial Spruce Woods et de la base des forces canadiennes à Shilo, Manitoba. On connaît peu sa biologie et ses besoins en habitat en Amérique du Nord. Nous avons inventorié la région des dunes au Manitoba à la recherche d’adultes et de stades immatures de l’héliotin en juillet 2007 à l’aide de pièges lumineux et par des recherches visuelles durant la journée. Nous avons aussi procédé à un inventaire détaillé de la végétation dans les régions d’activité des héliotins. Les pièges lumineux ont capturé surtout des mâles, alors que les mâles et les femelles peuvent être observés en forte activité durant les heures d’éclairement. Il s’agit de la première observation d’activité diurne de l’héliotin blanc satiné au Canada. Nous avons vu les adultes en vol au-dessus des crêtes des dunes et au repos sur la végétation entre les dunes découvertes. Bien que la population actuelle semble solide, compte tenu du nombre d’adultes observés, une évaluation approximative de la population de l’ordre de 5000 individus peut être une surestimation, car l’habitat des dunes de sable existant est restreint. Nous n’avons pas réussi à trouver les stades immatures, ni à déterminer la ou les plantes hôtes utilisées par les larves.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2009

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