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Full-Text Articles in Life Sciences
Consequences Of Loss Of An Abundant Pollinator: An Experimental Study, Allysa Hallett
Consequences Of Loss Of An Abundant Pollinator: An Experimental Study, Allysa Hallett
Theses and Dissertations
Pollinator populations are declining worldwide, and this may lower the quantity and quality of pollination services. Since pollinators often compete for floral resources, loss of an abundant pollinator species may release others from competition and potentially alter floral visitation rates. We explored how the removal of a frequent pollinator, bumble bees, influenced pollination success of whorled milkweed (Asclepias verticillata). In three small and three large populations we quantified pollinator visitation rates and pollination success for control plots and for plots where bumble bees were experimentally excluded. We found that exclusion of bumble bees did not reduce A. verticillata pollination success. …
Effect Of Pollination And Postpollination Processes On Selfing Rate, Yuliya Sorin
Effect Of Pollination And Postpollination Processes On Selfing Rate, Yuliya Sorin
Theses and Dissertations
Selfing rates vary widely within and among populations of self compatible flowering plants. This variation is often attributed to differences in the amount and timing of self and outcross pollen deposition on stigmas, as well as to the influence of postpollination mechanisms that control pollen siring success. This study explores the relative importance of pollination and postpollination processes in determining selfing rates in monkeyflower, Mimulus ringens. We hand-pollinated flowers on each of 17 unrelated mothers with pollen from one of three experimental treatments intended to replicate field conditions: 1) Simultaneous deposition of 50% self pollen and 50% outcross pollen from …