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dc.contributor.advisor Wilson, Paul Siri en Haley, Wyndee A. en 2011-09-20T23:21:20Z en 2011-09-20T23:21:20Z en 2010 en 2010 en
dc.identifier.uri en
dc.description Includes bibliographic references (leaves 68-72). en
dc.description.abstract Certain floral characteristics are associated with specific pollinators. Hummingbird-pollinated flowers are usually red, lack a landing platform, lack color patterns on the perianth, and contain a high amount of dilute sucrose-rich nectar compared to bee-pollinated flowers. The goal of this study was to test hypotheses concerning the reasons for these characters to the extent that they involve hummingbird behaviors. An array was set up that contained 16 artificial inflorescences, each with five artificial flowers. In Experiment 1, flowers were made that differed only in color, and birds showed very little preference, slightly preferring red over other colors. In Experiment 2, color was made to be associated with nectar offerings, and birds learned to visit flowers of the color that provided much more nectar (6 versus 2 μL but not 4 versus 2 μL), but generally 2 μL was above the threshold for inclusion in the diet. In Experiment 3, birds were offered bird-nectar (8 μL of 12% sucrose) versus bee-nectar (2 μL of 48% hexose), and birds did not prefer the nectars that were similar to natural bird-adapted flowers even though they could extract bird nectar with less handling time. In Experiment 4, birds were offered flowers with and without landing platforms, and birds preferred flowers that lacked landing platforms, which saved them time. In Experiment 5, birds were offered flowers that were patterned or not, associated with differing nectar volumes, and birds did not associate the higher nectar reward with either flower type. In general, the preferences of birds fall far short of explaining the natural phenomenon of bird- versus bee-pollination syndromes. Other factors, such as adaptation to discourage bees, are discussed as additional causes of the differences between the syndromes. Furthermore, I delve into the possibility that bird behaviors may be based on their drive to sample new and different flowers, i.e., flowers unlike those that are optimally rewarding. en
dc.description.statementofresponsibility by Wyndee A. Haley en
dc.format.extent ix, 72 leaves : ill. (chiefly col.) en
dc.language.iso en_US en
dc.publisher California State University, Northridge en
dc.rights California State University, Northridge theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. en
dc.rights.uri en
dc.subject hummingbird en
dc.subject behavioral ecology en
dc.subject foraging en
dc.subject pollination syndrome en
dc.subject.other Dissertations, Academic -- CSUN -- Biology. en
dc.title Hummingbird choices at artificial flowers made to resemble ornithophiles versus melittophiles en
dc.type Thesis en
dc.contributor.department California State University, Northridge. Department of Biology en M.S. en
dc.contributor.committeeMember Hertel, Fritz S. en
dc.contributor.committeeMember Steele, Mark A. en

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