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• W1550103756 abstract "European honeybees were introduced to Australia in the 1820s and are now widespread as feral and domestic colonies in the temperate region, foraging for nectar and pollen from plants in at least two hundred genera. Many of the plant species visited by honeybees are among the nearly 1,000 species that have floral structures that facilitate pollination by birds or mammals. Numerous ecologists have expressed concerns that the pollination systems of such plants, which evolved in the absence of winged social insects, are at risk of disruption by honeybees, particularly because anthers, nectaries and/or stigmas are often separated by several centimetres. At the same time, honeybee industry advocates continue to argue for greater access to natural areas, citing a lack of evidence of negative impacts. To date, experimental studies of potential honeybee disruption of Australian pollination systems have produced a range of outcomes apparently demonstratingthat honeybees can enhance, decrease or have little effect on the quantity of fruit or seed produced in different vertebrate-adapted species. Less apparently, honeybees m a y be altering plant fitness by reducing seed quality. Such an effect would be expected if short-distance honeybee movement facilitate geitonogamy and inbreeding in contrast to longer-distance movements by native pollinators. As a result, honeybees could be expected to be a significant evolutionary pressure for some plant species. A comparative approach is needed to determine what types of pollination systems are most at risk of negative honeybee effects such as severe reproductive decline or inbreeding depression. In this study, I compared the roles of honeybees and native animal visitors in the pollination ecology of bird- and insect-adapted plant species using confamilial pairs of plant species in three plant families: Callistemon citrinus and Baeckea imbricata (Myrtaceae); Styphelia tubiflora and Epacris microphylla (Epacridaceae); and Grevillea acanthifolia and G. sphacelata (Proteaceae). In all six species, I identified the suites of probable pollinators and observed their foraging behaviour at flowers and among plants. I compared the proportion of flowers that produced fruit among selective pollination exposure treatments - exclusion of birds, exclusion of all pollinators, and open pollination - to deduce the likely role of honeybees. In the Epacridaceae and Proteaceae, I determined if plants were self-compatible and compared fruit set of manually pollinated flowers with that of open flowers to determine if plants were pollinator limited. Finally, in order to determine whether honeybees may be reducing seed quality, I compared seed produced from selective pollinator exposures for viability and genriination rate (in Callistemon citrinus ) and outcrossing rate (in Grevillea acanthifolia ). Overall, the results of this study did not support the hypothesis that pollination of bird-adapted plants by honeybees…" @default.
• W1550103756 created "2016-06-24" @default.
• W1550103756 creator A5028792004 @default.
• W1550103756 date "2002-01-01" @default.
• W1550103756 modified "2023-09-27" @default.
• W1550103756 title "Effects of European honeybees (Apis mellifera) on the pollination ecology of bird-and insect-adapted Australian plants" @default.
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