2009 Cilt 9 Sayı 3

Permanent URI for this collectionhttps://hdl.handle.net/11452/15734

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    Constructıng a specıes database and hıstorıc range maps for north amerıcan bumblebees (bombus sensu stricto latreılle) to ınform conservatıon decısıons
    (Uludağ Üniversitesi, 2009) Koch, Jonathan B.; Strange, James P.
    Bumblebees (Bombus Latreille 1802) are important native pollinators in North America. However, in the last decade at least six North American Bombus have experienced significant range contraction or population declines. A major limitation to studying species declines is the level of knowledge of historic occurrences and abundance. Here we review the current status of a bumblebee subgenus in North America, Bombus sensu stricto Latreille 1801, and present a method for generating a database and probable historic range maps from multiple museum collections. These databases and range maps can be useful tools when facilitating monitoring programs for at risk species.
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    Nectar secretion and bee guild characterıstıcs of yellow star-thistle on Santa Cruz island and lesvos: where have the honey bees gone
    (Uludağ Üniversitesi, 2009) Barthell, John F.; Clement, Meredith L.; Song, Daniel S.; Savıtsk, Amy N.; Hranıtz, John M.; Petanıdou, Theodora; Thorp, Robbin W.; Wenner, Adrian M.; Grıswold, Terry L.; Wells, Harrington
    We compared nectar secretion rates and bee guilds of yellow star-thistle, Centaurea solstitialis, on Santa Cruz Island (USA) and the Northeast Aegean Island of Lesvos (Greece). This plant species is non-native and highly invasive in the western USA but native to Eurasia (including Lesvos). “Nectar flow” was assessed by measuring nectar volumes in florets of flower heads covered with mesh bags (preventing visitation by bees); “nectar standing crop” data were taken from open (unbagged) flower heads to which all bees could gain access. We censused bees at C. solstitialis during comparable periods on both islands and determined the bee guild composition of the plant on Lesvos. Significant differences in nectar levels occurred between bagged and unbagged florets at each locale, especially during the period that pollinators were most common. Nectar flow and nectar standing crop volumes were lower on Lesvos than on Santa Cruz Island. The bee guild diversity at Lesvos was higher relative to Santa Cruz Island. Surprisingly, however, honey bees were not recorded during our monitoring periods on Lesvos.