Browsing by Author "Gonzalez, Victor H."
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Item Bee visitors of Centaurea solstitialis L. (Asteraceae) in an urban environment in northwestern Turkey(Springer, 2017-04-06) Gonzalez, Victor H.; Olsen, Alena; Mallula, Maija; Hranitz, John; Barthell, John; Çakmak, İbrahim; Tosunoğlu, Aycan; Uludağ Üniversitesi/Tıp Fakültesi/Arıcılık Geliştirme Uygulama ve Araştırma Merkezi.; 0000-0003-2303-672X; AAH-2558-2021; 57207796431; 35235434000Information on the pollination ecology and floral visitors of the noxious weed Centaurea solstitialis is available for several populations in its invasive range, but limited information is available in its native range, with most studies conducted on the Greek island of Lesvos. Herein, we document the visitation pattern of bees and explore the relationship of bee body size and nectar availability in weedy populations of C. solstitialis from an urban environment within its native range in northwestern Turkey. Studies were conducted at patches of C. solstitialis in abandoned lots at the Uludag University near the city of Bursa. A total of 41 species, including honey bees, belonging to five families and 19 genera were recorded. Small megachilid and halictid bee species were the most common visitors. Average nectar standing crop volume per floret was low (0.003-0.117 mu L) and did not significantly vary throughout the day. Average bee head width significantly correlated with average nectar standing crop volume but did not significantly change throughout the day. Analyses of pollen loads as well as direct observations of bee foraging behavior indicate that a large number of bees visit C. solstitialis, primarily in search of nectar while carrying a large percentage of pollen grains of this plant species on their bodies. These results are similar to previous observations on a non-weedy population of C. solstitialis from the island of Lesvos.Item Mid-summer urban bee community diversity on a campus in the Marmara Region of western Turkey(Oxford Univ Press Inc, 2014) Burrows, S. J.; Fernandez Pascual, Clemente Jose; Gonzalez, Victor H.; Çakmak, İ.; Uludağ Üniversitesi.Item Pan traps and bee body size in unmanaged urban habitats(Pensoft Publishers, 2016-07-13) Gonzalez, Victor H.; Park, Kristen E.; Hranitz, John M.; Barthell, John F.; Çakmak, İbrahim; Uludağ Üniversitesi/Arıcılık Geliştirme-Uygulama ve Araştırma Merkezi.; AAH-2558-2021; 57207796431Pan traps are among the most popular methods employed to survey bees and changes in some functional traits, such as body size, are increasingly used to understand how bee communities and species respond to landscape changes. Herein we assess body size differences between bees captured at ground-level and elevated (70 cm) pan traps in unmanaged urban habitats in northwestern Turkey. We compare body size at the community level as well as for the sweat bee Lasioglossum malachurum (Kirby) (Halictidae: Halictini), the most abundant species. We also compare the diversity, richness and abundance of bees sampled at both heights. A total of 31 species (13 genera of three families) were captured. We did not find significant differences in the abundance nor in the species richness between heights, and Simpson's indices were similar. At the community level, average intertegular distance was significantly greater in bees collected at the elevated traps than on the ground. Intertegular distances in L. malachurum did not differ between elevated and ground-level pan traps. Our results show an effect of pan trap height on bee body size in the urban habitat surveyed, thus suggesting that assessing bee body size from samples collected with either ground-level or elevated pan traps alone might result in biased estimates of this functional trait.