Global ETD Search
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Showing 1 to 14 of 14 for “"niche conservatism"”.
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Biogeography of Isolepis subgenus Fluitantes (C.B. Clarke), Muasya (Cyperaceae): niche conservatism, long distance dispersal and hybridization
Numerous lineages of the Western Cape of South Africa show affinities with the flora of tropical Africa and with Australasia. Recent work suggests that most migrations between the Western Cape and tropical Africa occur in a northward direction, and that connections between the flora of regions in …
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Towards a Temporal Theory of Ecology: Body Mass Role for Activity Patterns of North American Artiodactyls
… its relationship to intraspecific diel temporal niche conservatism (i.e., high coincidence of activity patterns among populations of a species), will help us understand the evolutionary drivers of activity patterns and how energetics may play a role. Activity patterns were classified as …
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Examining patterns of coexistence in the Cape genus Tetraria (Cyperaceae) from a phylogenetic perspective : tracing the history of community assembly processes
… are subject to phylogenetic constraint and niche conservatism, suggesting that patterns of coexistence should be phylogenetically structured. This study compares patterns of coexistence against phylogenetic and ecological divergence in the genus Tetraria (Cyperaceae), and related sedges in …
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Application of high-throughput methods to reconstruct the evolutionary history of amherstieae by using the fossil pollen record of Striatopollis catatumbus and extant geographical records of the tribe
… than previously estimated. The concept of niche conservatism in different groups of angiosperms is critical to understanding what environmental factors have driven their current geographic distributions. In the final chapter of this dissertation, the concept of niche conservatism was …
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A Spatio-temporal Phylogenetic Approach to Community Ecology
… events. I find patterns consistent with niche conservatism and adaptive radiation, where the environmental gradient associated more with turnover of recently diverged lineages than with ancestral lineages.
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The effect of the study region on GIS models of species geographic distributions and estimates of niche evolution; preliminary tests with montane rodents (genus Nephelomys) in Venezuela
Various niche-based techniques exist to model a species' potential geographic distribution in a Geographic Information Systems (GIS) framework. These models compare the environmental conditions of localities of a species' occurrence versus those of the overall study region. In addition to uses in …
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The effects of environment and niche on the distributions of dwarf chameleons, present and future
The niche and niche breadth of Dwarf Chameleons, Bradypodion, was assessed in terms of broad scale climatic factors. A niche-based modelling method was then used to construct present and future habitat suitability maps for 2050 and 2080, for species in the genus. Additionally, the relationship …
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Examining neotropical primate community structure at regional and local scales : insights from taxonomic and phylogenetic approaches
… complex relationships. At local communities, niche differentiation is expected to allow species coexistence. However, these differences may reflect evolutionary constraints of species, rather than active selection. I investigated niche overlap and presence of niche conservatism for primate …
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Evolutionary Assembly of the Neotropical Montane Avifauna
… of 45 co-distributed birds. First, I found that niche breadth, dispersal ability, and clade age influence lineage diversity (population differentiation). In particular, species that are old, poor dispersers, and specialized to narrow elevational zones, accumulate greater lineage diversity with …
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Biogeographical And Evolutionary Processes Influencing The Assembly Of Deciduous Forest Plant Communities
… evolutionary processes, including phylogenetic niche conservatism, may contribute to high species richness in communities on fertile, calcium-rich soils. Analyses of the phylogenetic ‘depth’ of communities along this gradient demonstrated that species-rich communities on calcium-rich soils …
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Species delimitation and speciation process in the Seriphium plumosum L. complex (Gnaphalieae: Asteraceae) in South Africa
… These findings suggest that phylogenetic niche conservatism and/or the limited dispersal abilities characteristic of many Cape clades have been important in diversification by neutral and adaptive processes in the region. If extrapolatable to other Cape lineages, this work implies that …
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IMPROVING THE ASSESSMENT OF SPREAD AND IMPACTS OF FRESHWATER INVASIVE SPECIES
… methodological choices affect measures of niche dynamics. Niche conservatism is a prerequisite for Species Distribution Models (SDMs) transferability across space and time. SDMs are widely used in biological invasion studies to infer the potential distribution of an invasive species in its …
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Taxonomy, phylogeny and resource use of Glyptapanteles (Hymenoptera: Braconidae, Microgastrinae), genus highly diversified in the Neotropics
… onto the phylogeny revealed patterns of niche conservatism in one of the clades. It was revealed that host preferences of Glyptapanteles are concentrated primarily in exposed feeding Macrolepidoptera, although ancestrally they explored Microlepidoptera.
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Systematics and Species Delimitation in New Guinea Skink Species Complexes (Squamata: Scincidae)
… Pleistocene glaciations. Through also examining niche evolution in the group, I find evidence for niche conservatism among most species in the group, but two species, C. bicarinata and C. sp. Amau from eastern Papua New Guinea, show evidence for environmental niche divergence. Analyses of the C. …