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Evolution Of Dioecy In Echinocereus Coccineus: Relative Influence Of Pollinators, Resources And Elevation Over Multiple Spatial Scales, Summer Ann Scobell
Evolution Of Dioecy In Echinocereus Coccineus: Relative Influence Of Pollinators, Resources And Elevation Over Multiple Spatial Scales, Summer Ann Scobell
Open Access Dissertations
"Why have separate sexes?" is a fundamental question in biology and has been investigated intensively since Darwin first proposed two hypotheses: Separate sexes evolve 1) to avoid detrimental effects of self-fertilization or 2) to improve allocation of scarce resources to each sex's reproductive function. In animal-pollinated plants dioecy is hypothesized to be favored when small, generalized pollinators predominate because they increase self-fertilization rates of plants. I concurrently tested Darwin's hypotheses using Echinocereus coccineus (Cactaceae). I found, as predicted, when specialized pollinators (hummingbirds) were excluded from plants and only generalized pollinators (bees) visited, selfing rates of plants increased 238%. High selfing …
Ecophysiology Of The Gray Snapper (Lutjanus Griseus): Salinity Effects On Abundance, Physiology And Behavior, Xaymara M. Serrano
Ecophysiology Of The Gray Snapper (Lutjanus Griseus): Salinity Effects On Abundance, Physiology And Behavior, Xaymara M. Serrano
Open Access Theses
Mangroves and seagrass beds serve as essential fish habitat for many economically- and ecologically-valuable species. Depending on their location, these shallow-water habitats are often characterized by substantial fluctuation in salinity levels, which can represent a source of osmoregulatory stress for associated organisms. In South Florida, one of the most important fish species that utilizes these habitats is the gray snapper (Lutjanus griseus). Although this species constitutes a significant portion of the region?s total recreational fishery harvest, the effects of salinity on its distribution, physiology and behavior remain poorly understood. The main goal of this thesis was then to investigate the …