. Die kanadische Feld - naturforscher. 1999 Notizen 285 Hummeln, Bombus spp., Nahrungssuche auf rote Eiche, Quercus rubra. Acorn Galle im südlichen Ontario Brendon M. H. Larson Institut für Botanik, Universität Toronto, 25 Willcocks Street, Toronto, Ontario M5S 3B2, Kanada Larson, Brendon M. H. 1999. Hummeln, Bombus spp., Nahrungssuche auf rote Eiche, Quercus rubra, Acorn Galle im südlichen Ontario. Kanadische Field-Naturalist 113 (2): 285-286. Hummeln und andere aculeate Hymenopteren wurden beobachtet, Sammeln einer Sekretion mit der Galle von Callirhytis operator (Cynipidae) von eicheln von Red Oak {Quercus rubra verbunden)

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. The Canadian field-naturalist. 1999 Notes 285 Bumblebees, Bombus spp., Foraging on Red Oak, Quercus rubra. Acorn Galls in Southern Ontario Brendon M. H. Larson Department of Botany, University of Toronto, 25 Willcocks St., Toronto, Ontario M5S 3B2, Canada Larson, Brendon M. H. 1999. Bumblebees, Bombus spp., foraging on Red Oak, Quercus rubra, acorn galls in southern Ontario. Canadian Field-Naturalist 113(2): 285-286. Bumblebees and other aculeate Hymenoptera were observed collecting a secretion associated with galls of Callirhytis operator (Cynipidae) on acorns of Red Oak {Quercus rubra) at Lake Matchedash, Ontario, in August 1996. This is the first record of bumblebees collecting gall secretions, which may be a locally important sugar source during mast years. Key Words: Bumblebees, Bombus, cynipid wasp, Callirhytis operator, Cynipidae, Hymenoptera, Red Oak, Quercus rubra, acorn, galls, Ontario. The phytophagous larvae of many insects induce production of galls on their plant hosts (reviewed in Shorthouse and Rohfritsch 1992). This interaction has received much attention because it is often detri- mental to the host (Collins et al. 1983; Crawley and Long 1995) and because the galls support a diverse community of parasitoid and inquiline insects (Wiebes-Rijks and Shorthouse 1992; Schonrogge et al. 1995). Here, I report new observations concerning an additional interaction supported by gall insects that has not been discussed in the recent literature. During early August 1996, 1 observed bumblebees {Bombus spp.) and other aculeate Hymenoptera (Table 1) collecting a secretion associated with galls on acorns of Red Oak {Quercus rubra). The Q. rubra trees were located along the shore of Lake Matchedash (also called Long Lake), Simcoe County, Ontario (79°30'45"W, 44°47'00"N). The galls were yellow in colour and located on the out- side of the acorn near its junction with the cup (Figure 1), and were identified as the pip galls of the agamic generation of the

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• bookauthorottawafi
• bookcentury1900
• bookdecade1910
• bookyear1919