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 32 for “"niche partitioning"”.
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Habitat driven responses of reef fish: temporal change, niche partitioning and selection
Shallow water tropical and temperate marine habitats are changing dramatically in response to many stressor-driven effects. The change in turn threatens the associated fish communities relying on their maintenance for habitat provision. At present, a much better understanding of the interaction …
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Functional divergence between Vachellia and Senegalia could underpin differences in invasiveness and Eltonian niche partitioning in African savannas
… and Senegalia suggest their possible ecological niche divergence, which could explain the observed differences in invasiveness between them. This thesis provides the first ecophylogenetic study to assess the level of ecological niche divergence between these economically, socioeconomically and …
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Ecological niche partitioning and resource utilization in two sympatric lacertid lizard species (Meroles anchietae and M. cuneirostris) from the Namib Desert
… one habitat requires divergence into one or more niche dimensions (i.e., spatial, temporal and trophic) to reduce competition. Coupled with a scarcity of resources, the Namib Desert is an arid ecosystem with a high lizard diversity and presents an ideal ecosystem to investigate niche partitioning …
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Behavioural ecology of sympatric lemur species Lemur catta and Eulemur sp. In forest fragments, south-eastern Madagascar
I examine the niche partitioning between native ring-tailed lemurs, Lemur catta, and an introduced hybrid brown lemur population of Eulemur rufus x E. collaris in Malaza gallery forest of Berenty reserve, in comparison with the natural sympatric population of ring-tailed lemurs and red collared …
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Evolutionary palaeoecology of the megaherbivorous dinosaurs from the Dinosaur Park Formation (upper Campanian) of Alberta, Canada
… plant resources. Others have argued that dietary niche partitioning played an important role in the coexistence of these animals, with each species consuming a different plant resource than the next, thereby minimizing interspecific competition. This dissertation uses the megaherbivorous dinosaur …
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Intraspecific competition in Leucadendron xanthoconus (O.Knutze) K. Shun
… plants there was no evidence to suggest niche partitioning between the sexes. Though competition was detected, its importance in relation to other factors in the community appeared to be low. Further studies are required to determine the processes operative in such dioecious populations. …
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Comparative Biology of Sympatric Red Diamond and Southern Pacific Rattlesnakes in Southern California
… within the context of resource use and niche partitioning. Using radio-telemetry and mark-recapture involving passive integrated transponders (PIT) tags, I studied Red Diamond (Crotalus ruber) and Southern Pacific (C. oreganus helleri) Rattlesnakes in Chino Hills State Park, California, …
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The pelagic copepods of Lambert's Bay : an ecological study of a west coast fishing ground
… life histories with indications of time/space niche partitioning. In comparison to the more intense seasonal upwelling area off the Cape Peninsula, there was a trend toward fewer species, larger animals, and more carnivores. This trend was related to changes in the physical and biotic …
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Utilizing an Integrated Approach to Explore Niche in a Complex Equatorial System
… rich tapestry of life seen on Earth. The term "niche" describes how animals partition resources in space and time, shaped by behavioural choices and environmental conditions. Iterations of niche over time have focused on different aspects of a species' ecological characteristics, from Grinnell’s …
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An Experimental Assessment of Soil-Based Habitat Partitioning in Understory Palms
… high nutrient sites. These results suggest that niche partitioning along soil nutrient and water availability gradients along with the influence of pathogens and herbivores may promote the high palm species diversity documented for montane forests of Panama.
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Ecophysiology and Food Web Dynamics of Spring Ecotone Communities in the Edwards Aquifer, USA
… trophically complex communities with substantial niche partitioning among species. I finally examined the hypothesis that subterranean organisms in systems with ample energy resources (such as guano caves or spring ecotones) may not exhibit reduced metabolic rates. I assessed metabolic and …
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Diversity of larval tuna diets across the central equatorial Pacific
… trophic strategies and the potential for niche partitioning that may reduce interspecific competition for prey between tunas. This study sheds light on the ecological flexibility of larval tuna and underscores the importance of considering early-life foraging behavior in efforts to …
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Biotic and abiotic mechanisms shaping multi-species interactions
… 2, I explore intra- and inter-specific dietary niche partitioning of Piper fruits among three frugivorous bats, illustrating the importance of fine-scale mechanisms that facilitate species coexistence and influence plant–animal interactions. In Chapter 3, I demonstrate how the chemical ecology …
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Genetic basis of adaptive radiation in East African cichlids
… oral jaw design and correlates with ecological niche partitioning. Convergent evolution of trophic forms between lakes suggests a common mechanism. What combination of intrinsic and extrinsic factors constitute this mechanism still remains to be seen. The goal of this dissertation was to examine …
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Niche Occupancy, Partitioning, and the Role of Trophic Flexibility in Coexistence of Neotropical Bats
Understanding niche occupancy of an organism is critical to understanding its role in the environment, and how it persists as compared to others. In animal studies, the trophic niche is often used as a simplification of the Hutchinsonian realized niche. Trophic flexibility is a common strategy …
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In the Margins: Reconsidering the Range and Contribution of Diazotrophs in Nearshore Environments
… However, recent work suggests that the niche preferences of distinct diazotrophic (N<sub>2</sub> fixing) clades differ due to their metabolic and ecological diversity, hampering efforts to close the N budget and model N<sub>2</sub> fixation accurately. Here, I explore the range of …
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Biology and host finding of predaceous hister beetles (Coleoptera: Histeridae) associated with Ips spp. (Coleoptera: Scolytidae) in loblolly pine (Pinus taeda L.)
… tree location by histerids and may facilitate niche partitioning among species. Platysoma parallelum was attracted to horizontally positioned logs, representing trees more likely to be infested by Ips spp., while Pla. attenuata preferred vertical logs, representing standing pines, which tend to …
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Nutrient enrichment modulates the structure and temporal assembly of riverine benthic algal and macroinvertebrate assemblage.
… gain by occupying particular temporal niches, which degrades an important facet of stream biodiversity. In assemblages of periphytic algae, temporal niche partitioning has evolved in response to seasonal oscillations in environmental conditions. Compensatory dynamics of algae under …
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Examining the feeding ecology of two mesopelagic fishes (Lampanyctodes hectoris & Maurolicus walvisensis) off the west coast of South Africa using stable isotope and stomach content analyses
… webs, the adaptive features used to facilitate niche partitioning among co-existing and presumably competing mesopelagic species is unclear. This study examined the trophic ecology of the two principal mesopelagic fishes off the west coast of South Africa (lanternfish Lampanyctodes hectoris and …
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Influence of habitat complexity on diversity and community structure of arboreal spiders in grassland-shrub systems
… of the central issues in ecology. The ecological niche concept recognizes that distribution of species is influenced by abiotic (e.g., temperature, landscape characteristics, and nutrients) and biotic (e.g., food availability) factors through both direct and indirect mechanisms. Many of these …
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