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Thesis (Ph. D.)--Ohio State University, 2003. / Title from first page of PDF file. Document formatted into pages; contains xx, 245 p.; also includes graphics. Includes bibliographical references (p. 206-216).

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Poster exhibited at GPSC Student Showcase, February 24th, 2016, University of Arizona. / We investigated whether bees have an innate preference for flowers with saturated pigments and whether experience altered any preference. Preference could be a result of reward quality varying by color morph and/or responses to the petals, anthers, or their combination. Consequently, we gave bees experience on one of four floral configurations created from two color morphs of Solanum tridynanum. We subsequently tested learned preference using an array of all four configurations. Changes in preference as a result of experience were not mediated by anthers, only by petals. Bees that first experienced configurations with purple petals subsequently preferred configurations with purple petals, relative to naïve bees. However, bees that first experienced white petals showed no subsequent change in preference relative to naïve bees. Surprisingly, naïve bees showed no preference for any particular floral configuration. Rather than an innate preference for flowers with more saturated colors, bees are less able to develop a preference for unsaturated types. Because individuals are more able to develop a preference for saturated flowers, these flowers experience greater visitation, and thus greater pollination success, over unsaturated types.

Smulkiažiedė sprigė (Impatiens parviflora) yra iš Azijos kilusi rūšis. Europoje pradėjo plisti 1837 m., sulaukėjusi iš Drezdeno botanikos sodo. Dabar smulkiažiedė sprigė paplitusi beveik visoje Europoje. Rūšis sparčiai plinta ir Lietuvoje, skverbiasi į pusiau natūralias ir natūralias buveines. Smulkiažiedės sprigės poveikio miško bendrijos augalams tyrimai atlikti 2005 m. Verkių regioniniame parke, Vilniuje. Vegetacijos sezono metu kontroliniuose ir eksperimentiniuose laukeliuose buvo registruojamas augalų projekcinis padengimas ir smulkiažiedės sprigės individų skaičius. Šie duomenys leido įvertinti santykius tarp miško bendrijos augalų ir smulkiažiedės sprigės, jos sėklų dygimo spartą ir trukmę. Rudenį, naudojant sėklų gaudyklės, tirtas sėklų sklidimo intensyvumas. Nustatyta, kad smulkiažiedė sprigė labiausiai stelbia Lietuvoje savaiminę tos pačios genties rūšį – paprastąją sprigę (I. noli-tangere). Tyrimo rezultatai neleidžia patvirtinti hipotezės, kad smulkiažiedės sprigės stelbia kitus vietinius lapuočių miško bendrijos augalus. / Impatiens parviflora is a species native to Asia. First it was recorded escaped from the Botanical garden in Drezden (1837) and later spread all over Europe. This species is an invasive plant in Lithuania because spreads rapidly and invades both semi-natural and natural habitats. Investigations on small balsam impact to plants of forest community were performed in 2005 in Verkiai regional park (Vilnius). During one vegetation season, coverage of plants and individuals of small balsam were registered in the test and control plots. These data let us to estimate relationships between plants of forest community and I. parviflora, speed and time of small balsam seed germination. Intensity of seed spread in autumn was investigated using seed catcher method. It was estimated that I. parviflora competes with I. noli-tangere, species of the same genus that is native in Lithuania. Strong facts, supporting hypothesis that small balsam competes with other native plant species were not found during this investigation.