Koether, Steven , Williams, Justin .
Nectar Production Dynamics in Pentalinon luteum (Apocynaceae).
There are few pollination studies in the Apocynaceae. Of these studies, only five examine nectar features and even fewer detail nectar secretion patterns or sugar concentration. Nectar production rate and nectar removal effects were determined for a south Florida population of P. luteum. Morphological measurements were also collected for comparison with nectar sugar. The highest amount of nectar secretion, nectar availability, and variability in data occurred between 1400 and 1600 hrs, two hours after the high temperature for the day. On the second day, after a brief rain, the amount of nectar appeared only to increase when flowers were undisturbed. Effects of nectar removal did show an effect on the apparent nectar production rate for the sets sampled after 1200 hr. Flowers did not change overall sugar production the more they were sampled. When comparing floral morphology to nectar production, 3 dimensions of the corolla tube showed the most influence on nectar production. A regression analysis showed that 6 percent of the variance in floral morphology was significantly correlated with sugar content data. Potential pollination mechanisms include skippers for the Florida population and both skippers and orchid bees for the Caribbean populations.
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1 - Sam Houston State University, Department of Biological Sciences, Box 2116, Huntsville, Texas, 77341-2116, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Lake Ontario/Hilton
Date: Tuesday, July 10th, 2007
Time: 4:30 PM