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Predispersal seed predation by a coleophorid on the threatened Gulf of St. Lawrence aster

Published online by Cambridge University Press:  02 April 2012

Royce Steeves ,
Vazrick Nazari ,
Jean-François Landry  and
Christian R. Lacroix
Royce Steeves*
Affiliation:
Floristic Diversity Research Group, Biodiversity Institute of Ontario, Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Vazrick Nazari
Affiliation:
Biodiversity Institute of Ontario, Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Jean-François Landry
Affiliation:
Agriculture and Agri-Food Canada, Neatby Building, Central Experimental Farm, Ottawa, Ontario, Canada K1A 0C6
Christian R. Lacroix
Affiliation:
Department of Biology, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island, Canada C1A 4P3
*
1Corresponding author (e-mail: rsteeves@uoguelph.ca).
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Abstract

The Gulf of St. Lawrence aster, Symphyotrichum laurentianum (Fernald) G.L. Nesom (Asteraceae), a small annual halophyte endemic to disturbed and highly transient habitats in the Gulf of St. Lawrence, is classified as “threatened” by the Committee on the Status of Endangered Wildlife in Canada. Lepidopteran larvae that are predispersal seed predators of the Gulf of St. Lawrence aster are reported for the first time from populations in Prince Edward Island National Park. DNA barcoding was used to identify the seed predators tentatively as larvae of the casebearing moth Coleophora triplicis McDunnough (Lepidoptera: Coleophoridae), which is typically associated with a related halophyte, Solidago sempervirens L. (Asteraceae). These larvae were found to consume a large proportion of seeds from one of two aster populations in Prince Edward Island National Park and may be yet another risk to the survival of this threatened species.

Résumé

L’aster du golfe du Saint-Laurent, Symphyotrichum laurentianum (Fernald) Nesom (Asteraceae), une petite plante halophyte endémique des habitats perturbés et très éphémères du golfe du Saint-Laurent, est considéré comme “menacé” par le Comité sur le statut des espèces menacées de disparition au Canada. Nous signalons ici pour la première fois l’existence de chenilles prédatrices des graines de l’aster du golfe du Saint-Laurent avant leur dispersion dans des populations du parc national de l’Île-du-Prince-Édouard (PEINP). Nous avons identifié provisoirement ces prédateurs des graines à l’aide des codes-barres de l’ADN comme étant les larves du porte-case Coleophora triplicis McDunnough (Lepidoptera: Coleophoridae) typiquement associé à une plante halophyte apparentée, Solidago sempervirens L. (Asteraceae). Ces chenilles consomment une forte proportion des graines dans l’une des deux populations d’asters du PEINP et elles constituent un danger supplémentaire qui pourrait mettre en péril la survie de cette espèce menacée.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 3 , June 2008 , pp. 297 - 305
Copyright
Copyright © Entomological Society of Canada 2008

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