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.
Results
Showing 1 to 9 of 9 for “"Character displacement"”.
-
Behavioral and genomic patterns of evolution during speciation via reproductive and agonistic character displacement
… in mating trait evolution via reproductive character displacement (RCD). Similarly, selection to avoid aggressive interactions with another species can result in agonistic character displacement (ACD). Both RCD and ACD can lead to a pattern of enhanced preferences for mating or fighting with …
-
Character displacement in Burkholderia biofilm communities and the effect of adaptive history on the evolution of niche breadth
… for colonization. We investigated the role of character displacement and facilitation in maintaining diversity in a synergistic, biofilm-adapted population of Burkholderia cenocepacia, an opportunistic pathogen of cystic fibrosis patients that infects by producing diverse biofilms. …
-
A test of the mechanical isolation hypothesis in two similar spider species
… species-specific and are important taxonomic characters in species identification. One explanation of this phenomenon, the mechanical isolation hypothesis was tested in two Nuctenea (Araneidae) species. According to this hypothesis, a lock-and-key isolating mechanism should lead to character …
-
Evolutionary and Ecological Patterns of Body Size in North American Freshwater Fishes
… trends, and regional and local community characteristics. The objective of this dissertation is to examine evolutionary, and regional and local community patterns of body size in North American freshwater fishes, and to identify factors influencing these patterns. Cope's rule, Bergmann's …
-
Phenology and frugivory of large-fruited species in northern New Zealand and the impacts of introduced mammals
… species for dispersers has resulted in character displacement in the timing of ripe fruit presentation. With this in mind I examined the timing of ripe fruit presentation – the phenological patterns – and nutrient complementarity of fruit species known to contribute to the kereru diet. …
-
The ecological, behavioral, and genetic factors influencing the diversification of Lake Malawi's rock -dwelling cichlids
… These results are discussed with respect to character displacement and sexual selection. The speciation of the mbuna has been closely tied to the diversification of male color patterns, yet little is known concerning the genetic basis of such a fundamental character. By (1) examining female …
-
Population dynamics of stochastic lattice Lotka-Volterra models
… possible origins of biodiversity. Predators are characterized with individual predation efficiencies and death rates, to which "Darwinian" evolutionary adaptation is introduced. We find that direct competition between predator species and character displacement together play an important role in …
-
Acoustic Signals of Closely Related Bird Species Differ More in Sympatry Than in Allopatry - But Not If They Are Learned
Closely related species often have similar mating signals because of their shared recent ancestry, which can affect their reproductive isolation and ability to live together when they overlap in range. Similar mating signals can result in costs of co-occurrence (e.g., maladaptive hybridization, …
-
Trends in Eukaryote Body Size in an Ecological and Evolutionary Context
… The first prediction of limiting similarity, character displacement, was confirmed. The second prediction of limiting similarity, character release, was not confirmed. It appears that changing climate at the end of the Pleistocene may be responsible for the body size trends, but intraspecific …