Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Species pairs"”.
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Comparative antifreeze trait analyses of Antarctic and temperate sister species pairs shed light on tempo of adaptive trait loss under relaxed selection
… in select secondarily temperate notothenioid species when selective pressure no longer exists. The magnitude of the change in AFGP trait expression could inform on the evolutionary history of these species since the AFGP gene evolved only once in notothenioids. We determined the evolutionary …
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Speciation and phylogeography: coalescent-based models applied to the Cape plant genus Pauridia
… in a profusion geographically restricted endemic species within a The CFR is a rich and dynamic for the molecular study of speciation, but until recently studies have focused on factors influencing diversification of whole lineages, than on details the speciation process within and between species …
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Speciation and phylogeography: coalescent-based models applied to the Cape plant genus Pauridia
… in a profusion geographically restricted endemic species within a The CFR is a rich and dynamic for the molecular study of speciation, but until recently studies have focused on factors influencing diversification of whole lineages, than on details the speciation process within and between species …
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Population processes and patterns across scales
… gut, and mating strategy dynamics in hybridizing species pairs. First, the dissertation tests whether a continental population decline of the monarch butterfly is caused by the scarcity of milkweed, as the milkweed decline has been shown to locally impact monarch population. The study concludes …
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The origins and maintenance of species boundaries in Jamesbrittenia O. Kuntze (Scrophulariaceae: Manuleae)
The genus Jamesbrittenia contains 83 species distributed throughout southern Africa. Many species produce attractive flowers and consequently their horticultural potential is currently being explored. Speciation patterns and reproductive isolation were investigated in order to identify trends that …
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Assessment of morphological and molecular genetic variation of freshwater mussel species belonging to the genera Fusconaia, Pleurobema, and Pleuronaia in the upper Tennessee River basin
… three unrecognized, phylogenetically distinct species. These species were separated from their closest congener by 2.85%, 3.17%, and 6.32% based on pairwise genetic distances of ND1. Gaps created from aligning ITS1 sequences were coded as fifth characters, which phylogenetically separated most …
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Do Saproxylic Curculionids Affect the Fitness of Co-occurring Cerambycids?
… common resources. Thus, interactions between species are possible and could even explain their coexistence. This study investigates evidence of negative or positive effects of curculionid beetles (Coleoptera: Curculionidae) on cerambycid beetles (Coleoptera: Cerambycidae) that coexisted in …
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Changes in Patterns of Territory and Habitat Overlap in Wood-Warblers Over Evolutionary Time
… by the ecological traits and strategies of the species that make up those communities. The conservation of ancestral traits can be important in determining how closely related species partition space and habitat on a local scale. Shared ecological traits and strategies of closely related species …
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Evolutionary and Ecological Patterns of Body Size in North American Freshwater Fishes
… in body size using relationships of extant species indicate that five of nine families of North American fishes contradict Cope's rule by exhibiting decreasing trends in body size as the group radiates. Results from the regional analysis of all North American fishes support Bergmann's rule …
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Plant Height Dynamics and Competition: From Local Interactions to Global Patterns
… to mediate competitive interactions between species. Despite theoretical predictions that taller plant species should exert stronger competitive effects on neighbours, plant height distributions in nature are generally right-skewed for species within neighbourhoods and communities. My thesis …
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Using Species Distribution Modeling to Assess Illegal Trade Risk: A Case Study of US Imports of Endangered Mahogany (Swietenia spp.)
… and the global conservation of endangered species. To protect tree species from this threat, governments have enacted legislation against importing illegally sourced plant products. These laws, including the US Lacey Act Amendment of 2008, involve collecting information from importers on …
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Pure and Mixed Strategies in Cyclic Competition: Extinction, Coexistence, and Patterns
… the extinction time of four cyclically competing species on different lattice structures using Lotka-Volterra dynamics. We find that the extinction time of a well mixed system goes linearly with respect to the system size and that the probability distribution approximately takes the shape of a …
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Ecological insight into three neotropical deer species: A study of spatial and diel distributions of white-tailed, Central American red brocket, and Yucatan brown brocket deer in northern Belize, Central America
Niche theory predicts that ecologically similar species sharing space and resources must differ along at least one niche axis to coexist, with space, time, and diet as the three primary axes. Despite their ecological and cultural significance in Central America, no peer-reviewed study has examined …
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MATING COSTS, MALE CHOICE DISPLACEMENT, AND THE EFFECTS ON HYBRIDIZATION AND SPECIATION IN THE HAWAIIAN CRICKET LAUPALA (SUBFAMILY:TRIGONIDIINAE)
Contact zones between two closely-related species provide unique laboratories for studying the processes of speciation. This is because, within these zones, species barriers will be reinforced and speciation will reach completion, or the barriers will break down, causing the two species to become …
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Interactions, Heterogeneity, and the Determinants of Multispecies Coexistence
… But in a finite world with over 8.7 million species, acquiring such resources is an inherently competitive endeavour. This has resulted in an extraordinary diversity of interactions, with varying strengths that have either negative or positive consequences for species’ performance. Over the …
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Reproductive Isolation and Genetic Divergence in a Young "Species Flock" of Pupfishes (Cyprinodon sp.) from San Salvador Island, Bahamas
… speciation is instrumental to understanding the species diversity observed today. Diverging populations are intriguing, because speciation has not reached an endpoint, yet the process that may eventually lead to distinct species can be studied. Systems that contain many putative species and/or …
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Phylogenetic relationships and the effects of edaphic heterogeneity on the distribution of Wiborgia (Fabaceae) in the Greater Cape Floristic region
… family in the CCR with a total of about 764 species (belonging to 43 genera, of which 83% of the species are endemic to the CCR), and sixth largest in the ECR with about 140 species currently recognised with 39.3% of these species endemic to the ECR. Wiborgia Thunb. is a legume genus made up …
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The Role of Climate Variability in Duck Population Ecology
… influencing abundance and persistence of many species. In northern hemisphere bird populations, local weather and climate cycles play important roles via effects on components of individual fitness (i.e., survival and reproductive success), and thus annual fluctuations in population sizes. I …
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Anthropogenic effects on site use and temporal patterns of terrestrial mammals in Harenna Forest, Ethiopia
… research comprehensively documenting wildlife species in Harenna Forest within the Bale Mountains National Park of Ethiopia. This area is one of the few remaining afro-alpine biodiversity hotspots and is home to numerous endemic plants and animals and offers socio-economic benefits to the …
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