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 155 for “"Habitat fragmentation"”.
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Responses of raptors to habitat fragmentation : from individual responses to population susceptibility
Habitat fragmentation has different effects on species and communities, depending on a suite of life-history and population traits: some species are more vulnerable to the effects of fragmentation than others. Contrasting responses suggest there are particular species' attributes that make an …
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Movement of the Cape dwarf chameleon (Bradypodion pumilum): are they vulnerable to habitat fragmentation?
Habitat fragmentation threatens the persistence of natural populations globally. Dispersal between populations can mitigate the negative impacts of habitat fragmentation. The Cape dwarf chameleon (Bradypodion pumilum) occupies heavily fragmented habitat and yet few studies have investigated their …
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The impacts of habitat fragmentation of Tsitsikamma fynbos, South Africa, on avian nectarivore presence, abundance, and pollination
Habitat loss and fragmentation of natural habitat, and other global change drivers resulting from human expansion and development, are putting ecosystems and biodiversity at risk. The Cape Floristic Region (CFR), confined to South Africa and known for its high biodiversity of especially plants, has …
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The Effect of Habitat Fragmentation on Forest Mammals: An Experimental Analysis of Three Squirrel Distributions in the Agricultural Landscape of East Central Illinois
… that gray squirrel absences were due to poor habitat suitability or competitive exclusion by resident fox squirrels. Radio-telemetry data from juvenile females of both species that were released into the agricultural landscape demonstrated that fox squirrels have superior dispersal ability, as …
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Restoration genetics of Murray Mallee and neotropical forests.
… and (3) be long lived relative to when most habitat fragmentation occurred. These traits result in tree populations having great genetic inertia and thus they tend to maintain genetic diversity (as measured by numbers of alleles) despite significant habitat fragmentation. However, trees are …
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Using simulations to predict the genetic connectivity of the Mojave desert tortoise
… tortoise is a threatened species that is facing habitat fragmentation from human development. Understanding the impact of fragmentation on this species is critical for developing appropriate conservation actions, but the effects of habitat fragmentation are often delayed, making it difficult to …
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Functional diversity enhances detection of ecosystem stability and resolution of predator-prey interactions within a multitrophic community
<p>Habitat fragmentation and loss are principal factors that contribute to the decline of biodiversity which in turn has a negative impact on ecosystem function. There has been growing interest in understanding diversity’s role in the mechanisms behind ecosystem resilience with much attention …
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Forest edges enhance mate-finding in the European gypsy moth, Lymantria dispar
… is essential to identifying the effects of habitat boundaries on species abundances, ranges, and spread rates. Movement barriers due to habitat fragmentation may reduce mate-finding ability in some species, particularly in heterogeneous landscapes containing low-density populations. This …
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Ecosystem service provision in dynamic heath landscapes.
… landscape-scale patterns and processes, such as habitat fragmentation. Whilst there is a vast body of research investigating the impacts of habitat fragmentation on individual species, much less is known about the impacts of habitat fragmentation on ecological processes, for example woody …
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The Evolutionary History and Conservation of Speyeria Idalia (Lepidoptera: Nymphalidae)
… microsatellites indicated the effects of recent habitat fragmentation for Midwestern populations when compared to populations in the Great Plains, in the form of increased genetic differentiation and lower levels of within population genetic variation.
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Global change effects on ant-mediated seed dispersal
… of human-caused global change factors, such as habitat fragmentation and climate change, for the future of these mutualisms are not fully understood. My dissertation consists of five chapters that investigated the effects of habitat fragmentation and climate change on ants and their seed …
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Migration strategies and circannual patterns of habitat use of snowfinches (Montifringilla nivalis nivalis) in a patchy alpine landscape
… overexploitation, pollution, species invasions, habitat fragmentation and alteration and climate change. Species responses are not always linear or instantaneous, nor they are equal at any spatial scale. Detection of early-warning signs of critical biodiversity changes is thus needed and the …
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Variation in pollination across a fragmented landscape at the Cape of Africa
… system. Before exploring the consequences of habitat fragmentation, it was necessary to study the natural history of the plant-pollinator interactions. Among 16 conservation areas, I studied variation in the pollination of Brunsvigia orientalis (Amaryllidaceae) by Nectarinia sunbirds.
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Understanding the role of fragmentation in informing small mammal diversity and abundance in Rûens Renosterveld
This thesis engages with the theory of habitat fragmentation through the lens of small mammals within a highly fragmented landscape in the Overberg, South Africa. The study explores habitat features in fragments of Eastern Rûens Shale Renosterveld associated with small mammal diversity and …
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