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 71 for “"Keystone Species"”.
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Dryland state transitions, trophic interactions, and the restoration of a keystone species
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Biomimicry in Leadership: How Healthy Leaders Facilitate Healthy Organisational Ecosystems– Lessons from Keystone Species
… investigating whether patterns of behaviour in keystone species can inform a biomimetic approach to healthy leadership that supports resilience. Keystone species are nature's influencers. They contribute to ecosystem health through their disproportionate impact on their environments. Through an …
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Predicting ecological impacts of climate change and species introductions on a temperate chalk stream in Southern Britain - a dynamic food web model approach.
… a climate change and introduction of non-native species on ecosystems, it is important to understand how disturbances may affect community composition. This is inherently diffcult since species may be expected to respond differently to disturbances such as elevated temperatures or the …
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Plant-pollinator relationships of culturally significant food and medicine plants in the Great Lakes Region
… declines globally in recent years. While species declines have often been examined for their impacts ecologically and economically, little is known about how species declines will impact humans culturally. All Indigenous cultures in North America use plant species for food and medicine. …
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An isotope comparison of elephant (Loxodonta africana) diets in the Kruger National Park and Welgevonden Game Reserve
… in Africa, as elephants are considered a keystone species in wildlife areas, and are associated with a number of management issues. This dissertation focuses primarily on spatial and temporal variability in grass consumption by savanna elephants.
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The structure of experimental clastic-substrate marine communities
… determined by the effects of foundation, or keystone, species. It is suggested that the structure of classic-substrate communities may be determined similarly.
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Population Genomics, Ecology and Conservation of <i>Asterias</i> Sea Stars in the North Atlantic
<p>Uncovering how species respond to environmental change is a central question in biology (Ehrlén & Morris 2015; Habibullah <em>et al.</em> 2022). It is the key to elucidating the past, understanding the present and predicting the future of species’ population dynamics. This dissertation …
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Conservation genetics of Australian quolls
As carnivorous marsupials, quolls are keystone species crucial to ecosystem health. Although opportunistic and adaptable, anthropogenic disturbance has led to severe population declines. In response, captive breeding and translocation programs were implemented in an attempt to mitigate extinction …
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Plant Community Responses to Long-Term Seasonal Bison Grazing in the Dry Mixed Grassland of Saskatchewan
… that Plains bison (Bison bison bison) are a keystone species, it is not fully understood how plant communities respond to seasonal bison grazing. This study investigated plant community responses to long-term dormant and growing season bison grazing as well as an ungrazed control. The study …
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Understanding the role of Stylochus ellipticus as a predator of Crassostrea virginica in Chesapeake Bay tributaries
… Eastern Oyster (Crassostrea virginica), a former keystone species in Chesapeake Bay. Here, I examine the polyclad flatworm Stylochus ellipticus and its potential role as an important predator of C. virginica. Using small-fragment size C. virginica specific DNA primers, oyster DNA was successfully …
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Predatory and Mutualistic Interactions between Freshwater Minnows and their Predators
Keystone species are widely distributed across aquatic and terrestrial ecosystems and are fundamental in preserving the structure, diversity, and stability of an ecological community due to its disproportionately large impact on its community relative to its biomass. As biodiversity of ecosystems …
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Ecological Responses to Climate Change: Using the Common Ragworm (Hediste diversicolor) as an Indicator for Benthic Ecosystems
… past and were also associated with loss of species, particularly in the marine environment. This research uses the common ragworm Hediste diversicolor as a model organism to investigate the physiological and ecological impacts of changing temperature and pH on hardy, benthic species. H. …
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The Role of Gopher Tortoise Burrows (Gopherus polyphemus) in Shaping Herpetofaunal Diversity in the Sandhills of Southeast Georgia
… large numbers of invertebrate and vertebrate species associated with their burrows. I compared herpetofaunal species diversity and richness at Gopher Tortoise burrows and random points not near burrows on a sandhill in Southeast Georgia. I also compared habitat structure between burrows and …
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Effects of Site Preparation, Seed Germination, and Harvest Maturity on Wiregrass Restoration Efforts at Fort Stewart, GA
… Michx.) was once the dominant ground cover species within the Atlantic Coastal Plain longleaf pine (Pinus palustris Mill.) ecosystem. Less than 1 million hectares of intact longleaf pine-wiregrass communities remain, due primarily to anthropogenic activities. Wiregrass is a keystone species …
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Emotional Evidence of Change: Highlanders Experiences with Glacial Retreat in Peru
… those in mountainous environments. Much like a keystone species, glaciers are largely depended upon at global and local scales. They offer climate data from core samples, influence sea level, serve as a water resource for individuals, communities, and agriculture, provide spaces for recreational …
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Population Structure and Biophysical Density Correlates of Whitebark Pine (Pinus albicaulis) at Two Treelines in the Northern Rocky Mountains
… northern Rocky Mountains. Whitebark pine is a keystone species and an important component of treeline ecosystem dynamics; however, subalpine populations have declined nearly rangewide in recent decades. Though declines in subalpine forests have been well documented in the literature, few …
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Hydraulic Characterization of Mounded Gravel Fish Nests: Incipient Motion Criteria and Despiking Acoustic Doppler Velocimeter Data
The bluehead chub (Nocomis leptocephalus) is a keystone species, an ecosystem engi- neer that constructs mounded gravel nests for spawning. Chubs provide benefits for other spawning fishes, predators, and benthic organisms through their nest construction. This study seeks to apply sediment …
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Landscape pattern and blister rust infection in whitebark pine (Pinus albicaulis) at alpine treeline, Northern Rocky Mountains, U.S.A.
… pine (Pinus albicaulis) is a foundation and keystone species at alpine treelines of the northern Rocky Mountains and is threatened by the fungus white pine blister rust (Cronartium ribicola). This disease affects all five-needled white pines, but has caused particularly widespread mortality …
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Lack of polymorphism suggests a recent bottleneck of Aloidendron pillansii: Exploration into the population of Aloidendron pillansii from phylogeographical analysis of molecular data
The Karoo-Namib is a species rich region in which many iconic and keystone species are found, such as Aloe pillansii. The recent population history of A.pillansii is poorly understood. However the suggested climatic shifts that occurred throughout the Holocene era may have affected its …
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Effects of biochar, subsoiling, and native seeding on the establishment of pollinator habitat in log landings
… to wild bee populations. Since pollinators are keystone species for agricultural and forested ecosystems, pollinator habitat restoration is critical to ecosystem health and stability worldwide. Boosting the abundance, richness, and diversity of floral resources and bee nesting sites may assist …
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