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Dissertations / Theses on the topic 'Invasive aliens'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Lo, Veronica Bethany Pui Gwun. "Underwater aliens : quantifying propagule pressure of aquatic invasive species in Canadian shipping ports." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/13696.

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Increased trading worldwide has created introduction pathways for aquatic invasive species (AIS), particularly through shipping activities. In our research, we used ballast discharge data and estimates of the wetted surface area of vessels to provide preliminary estimates of the potential propagule pressure ballast and hull fouling organisms on Canadian shipping ports from the commercial shipping sector. We compared total wetted surface area, vessel arrivals and ballast discharge across shipping ports and vessel categories in the Atlantic, Great Lakes-St. Lawrence and Pacific shipping regions.

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2

Cronin, Kate. "Aliens in the nursery : assessing the awareness and attitudes of Cape Town nursery managers in regard to invasive species regulations." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15558.

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The horticultural industry is recognised as one of the major pathways for the introduction and spread of invasive alien plants (IAPs). In recognition of this, the South African government has recently enacted a new set of Alien and Invasive Species regulations, under the National Environmental Management Biodiversity Act (NEMBA), that are intended, in part, to improve controls on the horticultural industry's role in the spread of IAPs. In order to assess, and possibly enhance, the likely effectiveness of NEMBA, it is critical to build an understanding of stakeholders' awareness and attitudes t

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3

CHINCHIO, ELEONORA. "DISEASE RISK ASSESSMENT OF INVASIVE ALIEN SPECIES." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/821735.

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Increased global trade and travel have led to a rise in the number of invasive alien species (IAS), i.e. species introduced by humans in geographic areas where are not naturally found, worldwide. Despite the recognized role of wildlife, as well as of wildlife translocations, in the emergence and re-emergence of infections of public health significance, IAS remain mainly studied for their environmental impacts, and their disease risk towards humans and animals is still largely neglected by health professionals. The main aim of this thesis is therefore to cover this gap by setting the ground

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4

Theile, H. Lenore. "Invasion of contrasting ecosystems by alien plant species /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18380.pdf.

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5

CHATZIDIMITRIOU, EVANGELIA. "Alien Invasive Species in Europe: Three Case Studies." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3427137.

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The incidental introduction of alien phytophagous insects and mites has become quite a common event in the world owing to intensive commercial exchanges of plants and goods and ever-increasing tourist traffic. There is evidence that this phenomenon is increasing, in spite of the control measures of the EU phytosanitary system in order to minimize unintentional introductions. The introduction of an alien species in a new ecosystem and the interaction between an alien species and the autochthonous species usually has many disadvantages. The alien species can dominate the invaded ecosystems and

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6

Yapi, Thozamile Steve. "An assessment of the impacts of invasive Australian wattle species on grazing provision and livestock production in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/95455.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: I investigated the impacts of the invasive wattle species (Acacia mearnsii, A. dealbata, A. decurrens), on the ecological function and productivity of rangelands in South Africa and their ability to sustain livestock production. More specifically, this study set out to: (1) assess grazing areas at a national scale; (2) identify evidence of progressive impacts of these species on livestock production across a selection of magisterial districts; (3) determine the effects of A. mearnsii density on growth form dominance of indigenou

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Smith, Ross L. "Invasive alien plant species of The Bahamas and biodiversity management." Miami University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=miami1275062320.

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8

Schonegevel, Lucille. "Modelling alien vegetation invasions and clearing strategies." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52341.

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Thesis (MSc)--Stellenbosch University, 2001.<br>ENGLISH ABSTRACT: The burgeoning problem of alien plant invasions in South Africa necessitates effective decision-making based on an understanding of the complex processes that govern these invasions. Due to the spatial nature of the problem, this study explored the use of Geographic Information Systems and spatial models for predicting the spread of alien vegetation and assessing the effectiveness of clearing strategies. The Spatially Explicit Individual Based Simulation (SEIBS) model was identified as a potentially useful tool for alien pl

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9

Repath, Charles Fitts. "Evaluating and monitoring invasive plant processes." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/repath/RepathC0505.pdf.

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10

Dutrieux, Mariane. "Spatio-temporal species distribution modeling: Application to invasive alien species’ monitoring." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224319.

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The developments of species distribution modeling techniques have brought new opportunities in the field of biological invasion management. In particular, statistical niche modeling for spatio-temporal predictions of species’ distribution is a widely spread tool that has proved its efficiency. The main purpose of this Master thesis is to study applicability of species distribution modeling to invasive alien species, with the aim of supporting efficient decision-making for their prevention. Some research questions are: how useful can species distribution modeling be for invasives’ prevention? I

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11

Smith, Owen Peter. "Allelopathic potential of the invasive alien Himalayan balsam (Impatiens glandulifera Royle)." Thesis, University of Plymouth, 2013. http://hdl.handle.net/10026.1/1592.

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Investigations were carried out into the allelopathic potential of the invasive alien annual Himalayan Balsam (Impatiens glandulifera Royle) using a series of bioassays, including ones developed or adapted for this study. They were evaluated for their suitability to detect three of the four main modes of allelochemical release, namely leaching, exudation and decomposition. Assays which involved the measurement of lettuce radicles and hypocotyls gave reliable results and allowed a range of different Impatiens material, both living and dead, to be assessed and ranked according to the allelopathi

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12

Iacopino, Simone. "Exploring the multiple effects of the invasive alien black locust tree." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3425418.

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Black locust (Robinia pseudoacacia L.) is one of the most widespread invasive alien tree species in Europe and throughout the world. Its spread has been favoured by its ecological attitudes and economic relevance, with positive and negative implications. The aim of this thesis was to further develop knowledge on the black locust’s ecological and socio-economic drivers. A stand, landscape and national scale were considered. At the stand scale, ecological impacts on the plant community were assessed through a comparative approach, based on a sample of pairs of woodlands, invaded or non-invaded b

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13

Dawson, Wayne. "Explaining alien plant invasions using Amani Botanical Garden in NE Tanzania." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources. Restricted: no access until June 8, 2010, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26082.

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14

De, la Fontaine Samantha. "Assessing the values and impacts of invasive alien plants on the livelihoods of rural land-users on the Agulhas Plain, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/95461.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Invasive alien plants (IAPs) are known for their detrimental impacts on biodiversity and ecosystem goods and services. A substantial body of research has contributed to our understanding of their impacts on ecology. In comparison the socio-economic aspects of IAPs, are not well understood. Additionally, valuation practises have usually excluded the positive and the non-monetary impacts (benefits and uses) that IAPs hold for local livelihoods. Holistic valuation has been regarded as imperative for decision-making and managerial f

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15

Ndwayana, Hamilton Ncedo. "A sustainable development approach in the control of alien invasion vegetation." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020803.

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Invasive alien tree species have negative environmental and economic impacts throughout the world. For example, black wattle (Acacia mearnsii) threatens native habitats by competing with and so repressing or excluding indigenous vegetation: in this way it replaces grass communities, reduces biodiversity, and increases water loss from riparian zones, thereby fundamentally damaging the ecosystem. The Acacia mearnsii threat requires urgent attention: effective control and management is urgently required if these deleterious impacts are to be reversed or prevented. The present study was conducted

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Andreu, Ureta Jara. "Management of alien plants in Spain: from prevention to restoration." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/83943.

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Degut als impactes ecològics i socioeconòmics causats per les invasions biològiques, la seva gestió s’ha convertit en un repte important i una prioritat pels gestors mediambientals. A Espanya, la informació sobre la gestió de les plantes exòtiques està força dispersa i, en general, no hi ha gaire flux d’informació entre el món acadèmic i el món de la gestió. Per aquests motius, el principal objectiu d’aquesta tesi ha estat aprofundir en les mesures de gestió de plantes exòtiques a Espanya, identificant les seves principals limitacions. Conèixer aquestes limitacions ens ha dut a plantejar‐nos

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17

Meela, Moraba Macdonald. "Evaluation of alien invasive weedy plants for activity against plant pathogenic fungi." Diss., University of Pretoria, 2009. http://hdl.handle.net/2263/23195.

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Plant fungal pathogens are a major threat to food security worldwide. The most important method of protecting plants against fungal attack is the use of fungicides, but the development of resistance towards synthetic fungicides is of great concern. Moreover, the health risks associated with the use of chemical fungicides increase the need to search for safe, efficacious and environmentally friendly fungicides. Plants produce antifungal agents by secondary metabolism to protect themselves from fungal attack, and therefore many plant species have substantial antifungal activity. The use of plant

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18

Wannenburgh, Andrew. "A systematic spatial prioritisation for invasive alien plant control in South Africa." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/4817.

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Dube, Nqobizitha. "Invasive alien plants and rural livelihoods: a case of Gwanda District, Zimbabwe." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/4368.

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Biodiversity is the cornerstone of ecosystem functioning and the realisation that most rural African community livelihoods are directly dependent on ecosystem goods and services warrants its conservation. Invasive alien plants threaten biodiversity and compromise the ecosystem's ability to provide goods and services for rural communities, thereby negatively affecting livelihood strategies. Information on IAPs is lacking in most African countries, thus, the livelihood effects of Invasive Alien Plants (IAPs) are not clearly understood. In Zimbabwe, Cylindropuntia fulgida var. fulgida (Cff) has i

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Horsley, Catherine Anne. "Pollinator-mediated interactions between native plants and the invasive alien Himalayan balsam." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/5278/.

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Invasive alien species threaten global biodiversity and can impose severe economic costs. Some invasive alien plants can be strong competitors for pollinators due to a high abundance of attractive flowers, which can disrupt native plant-pollinator interactions and reduce native plant reproductive success. This thesis explores pollinator-mediated competition between native plants and the invasive alien Impatiens glandulifera, Himalayan balsam. Previous studies have found conflicting effects of I. glandulifera on native plant-pollinator interactions. This study aimed, using a combination of dire

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21

FALASCHI, MATTIA. "INTERACTIVE EFFECTS OF HABITAT MODIFICATION AND INVASIVE ALIEN SPECIES ON AMPHIBIAN BIODIVERSITY." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/822579.

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The biodiversity of our planet is facing a severe crisis. Habitat alteration, climate change, the spread of alien species, and overexploitation are major drivers of biodiversity loss. These global change drivers often act jointly or even synergistically on population declines. To identify priorities for conservation, it is thus essential to compare the relative impact of different threats on biodiversity. Amphibians are the vertebrates showing both the largest proportion of threatened species and the highest rate of decline. Out of the ~6,800 amphibian species assessed by the IUCN, more than 4

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22

Schoeman, Colin Stefan. "Synergistic impact of invasive alien plants and the alien Argentine ant on local ant assemblages in the Western Cape." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/21759.

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Thesis (MSc)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: Alien trees, Pinus spp. and Eucalyptus spp., affect ants negatively in the Cape Floristic Region (CFR), a global biodiversity hotspot in South Africa. They reduce ant abundance and species richness, thus also changing ant assemblage structure. This is alarming, because almost 1300 species of plant species in the CFR are dispersed by certain indigenous ants, and thus there is concern for an indirect effect on indigenous plant assemblages. One of the most impacting ant species on seed dispersal is the invasive Argentine ant

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23

Van, der Laan Michael. "Allelopathic interference potential of the alien invader plant Parthenium hysterophorus." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-04042007-134659.

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24

Blanchard, Ryan. "Alien plant invasion on the Agulhas Plain : a detailed description of invasion patterns." Bachelor's thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/24382.

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Invasive alien species occur within several biodiverse regions of South Africa. It is not yet fully understood the extent to which invasive alien species affect natural vegetation. It is important to classify such species based on abundance and distribution in order to determine invasion patterns and set priorities for management within a region. Such a study was adapted for the Agulhas Plain of South Africa in the Cape Floristic Region. Eucalyptus lehmannii was recognised as the top invasive alien species, occupying both natural and transformed landscapes at high densities, >130% canopy cover

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Doherty-Bone, Thomas M. "Effects of native and invasive alien decapods on freshwater biodiversity and ecosystem functioning." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15995/.

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Invasive alien species threaten freshwater biodiversity, with uncertain impacts on ecosystem services. Invasive alien decapods are frequent components of invaded ecosystems, and have been found to impact biodiversity, ecosystem properties and processes. Studies however often do not consider comparisons to native analogues. Native analogues could mask impacts of invasive alien species through functional redundancy. The native White Clawed Crayfish (Austropotamobius pallipes) is declining at the advance of the invasive alien American Signal Crayfish (Pacifastacus leniusculus) and the Chinese Mit

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Jurk, Clova. "Fouled yachts : a vector for marine invasive alien species to South African shores?" Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11045.

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Biofouling on recreational yachts is an important vector for marine invasive alien species (MIAS) in many countries. There are various characteristics of a vessel that make it more susceptible to hull fouling. Yachts in three Western Cape marinas were surveyed to assess extent of fouling, hull maintenance patterns, travel history and yacht-owner awareness of MIAS issues.

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Davey, Jared. "The effects of invasive alien plants on cultural ecosystem services : tourism and recreation." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/9238.

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Includes bibliographical references.<br>With the continued spread of invasive alien vegetation in South Africa, there is a growing need and recognition in protecting ecosystem service delivery. While most literature on ecosystem services has focussed on provisioning and supporting services, this study looks at the less addressed cultural ecosystem services, specifically focussing on tourism and recreation. This research explores the relationship between tourism and invasive alien vegetation. This was carried out at firstly a national level, utilising primarily quantitative methods to identify,

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Reeves, Brian. "A resource allocation system for invasive alien plant control on the St. Francis Conservancy." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1073.

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Alien invasive species pose a great threat to ecosystems and human communities (Richardson & van Wilgen 2004; Hobbs & Humphries 1995). On private lands, there is a need to find institutional, administrative and scientific responses to the alien plant problem that operate beyond the scale imposed by property boundaries (Slocombe 1998; Grumbine 1994). One such response is the development and support of institutions, such as the St Francis Conservancy, that foster cross-boundary management of landscapes (Hurley et al. 2002). This study seeks to promote collective decision-making and collaborative

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Pattison, Zarah. "Effects of invasive alien plants on riparian vegetation and their response to environmental factors." Thesis, University of Stirling, 2016. http://hdl.handle.net/1893/25404.

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Biological invasions are reportedly one of the major contributory factors to biodiversity loss worldwide. The impacts of invasive alien plant (IAP) species on native communities are widely documented in the scientific literature, however, there is still a lack of detailed information on their impacts within the most vulnerable habitats. Riparian habitats are highly dynamic systems and naturally disturbed, making them particularly vulnerable to invasion. Climate change, directly or indirectly, is also predicted to adversely impact river systems, which may subsequently alter invasion rates and t

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Holmes, P. M. "A comparative study of the seed bank dynamics of two congeneric alien invasive species." Doctoral thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/17724.

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Includes bibliographies.<br>The unique vegetation in the lowlands of the fynbos biome is threatened by alien Acacia encroachment. The seed bank dynamics of the two most widespread invaders in the region, Acacia saligma and A. cyclops, was studied to elucidate those factors contributing most to their invasive success. This information was then used to assist in developing optimal control methods. On the basis of information available prior to this study, it was predicted that both species would have large, persistent seed banks in the so.il, and that seed bank processes would provide the - key

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Muhl, Sara Ann. "Alien grass invasion of Renosterveld : influence of soil variable gradients." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/2991.

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Thesis (MScConsEcol (Conservation Ecology and Entomology))--Stellenbosch University, 2008.<br>This thesis examines the role of agricultural activity in the process of invasion of west coast renosterveld fragments by annual alien grass species. This highly endangered vegetation type has less than 5% remaining, it is vital to understand the mechanisms allowing invasion of annual alien grasses in order to effectively prevent the loss of the many rare and endemic species found in west coast renosterveld. This study was divided into three major components. Firstly the distribution of indigeno

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Van, Rooyen Suretha. "Factors affecting alien grass invasion into West Coast Renosterveld fragments." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49964.

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Thesis (MSc)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: With only 1.76% conserved West Coast Renosterveld remaining it is crucial to prioritize the conservation and management of this fragile vegetation type. Because of its occurrence on fertile soils, renosterveld has been cleared for cultivation and other agricultural use and is thus fragmented to a critical point. These remaining fragments are subject to extensive edge effects and the exact parameters of a viable fragment must still be determined. The extent of alien grass species invasion into remnant renosterveld patch

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Favaro, Riccardo. "Invasive Wood Borers: Detection, Establishment and Spread." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424701.

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The increasing international trade occurred in the last decades has raised the risk of introduction of invasive species. These are organisms introduced in new environments located out of their native area. Plants and insects represent the most common invasive species. Concerning insects, wood borers are the most important for forest ecosystems. Introductions of invasive alien species have strong ecological and economic effects on native fauna and their interception and eradication are prior goals. In the present work, the Asian longhorned beetle, Anoplophora glabripennis (Motschulsky), recent

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Riley, Sophie Law Faculty of Law UNSW. "Invasive alien species and the protection of biodiversity: the role of quarantine laws in resolving inadequacies in the international legal regime." Publisher:University of New South Wales. Law, 2008. http://handle.unsw.edu.au/1959.4/41301.

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The problem of invasive alien species (IAS) is recognized as the second most serious threat to loss of biodiversity after habitat destruction. It is a problem largely created by humans as they transport and introduce species, deliberately and accidentally, from one part of the globe to another. The pressures exerted on biodiversity by international trade are one of the most serious aspects of the IAS problem. Although states are under obligations in international environmental law to prevent the entry of, and control, those alien species that threaten biodiversity, to date state practice has o

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Itholeng, Kebalepile Benedict Itholeng. "The indigenous knowledge of the local community towards weeds and alien invasive plants in the Dinokana area, North-West Province, South Africa / by Kebalepile Benedict Itholeng." Thesis, North-West University, 2007. http://hdl.handle.net/10394/2129.

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Ramaswiela, Tshililo. "The spatial distribution of alien and invasive vascular plant species on sub-Antarctic Marion Island." Thesis, Stellenbosch : Stellenbosch University, 2010. http://hdl.handle.net/10019.1/5471.

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Thesis (MSc )--Stellenbosch University, 2010.<br>ENGLISH ABSTRACT: The patterns of spread of non-indigenous species and the factors influencing their distribution have been studied infrequently on Southern Ocean Islands, where the prevention and control of biological invasions is a priority for conservation management. Owing to its remoteness and relatively small size, sub-Antarctic Marion Island provides an ideal opportunity to investigate the patterns of spread of invasive species and the factors likely influencing the distribution of alien species. Therefore, this study provides a spat

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Nowell, Megan Sarah. "Determining the hydrological benefits of clearing invasive alien vegetation on the Agulhas Plain, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6855.

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Thesis (MScConEcol (Conservation Ecology and Entomology))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Invasive alien plants (IAPs) reduce streamflow and threaten the biodiversity of South Africa’s Cape Floristic Region. Up-to-date information on invasive vegetation is required for land management agencies to formulate policies and make appropriate resource management decisions. Invasion maps are typically not updated often enough because of the time and expenses required to do so. As a result, invasion maps for South Africa are limited to coarse resolution data or isolated

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Blanchard, Ryan. "An investigation of riparian vegetation recovery following invasive alien tree clearing in the Western Cape." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/6235.

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Includes abstract.<br>Includes bibliographical references (leaves 113-134).<br>Riparian zones are dynamic, as a result of varying levels of disturbance from natural flooding regimes, and this makes them particularly susceptible habitats to invasion by alien plants. In South Africa, particularly the Fynbos Biome, closed-stand invasions by alien Acacia and Eucalyptus species have been able to develop within riparian areas. Their impacts on water resources and biodiversity have been countered by manual clearing in order to protect the valuable ecosystem services provided by intact riparian zones,

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PETRUZZELLIS, FRANCESCO. "Functional traits as a tool to predict invasive potential of alien species in native communities." Doctoral thesis, Università degli Studi di Trieste, 2019. http://hdl.handle.net/11368/2962384.

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Le specie aliene invasive (IAS) si stanno diffondendo a velocità sempre più elevata, con effetti molto negative a livello degli ecosistemi. Infatti, le IAS sono considerate una della maggiori cause della perdita di biodiversità e semplificazione degli habitat a livello globale. Di conseguenza, uno dei più grandi obiettivi in campo ecologico è quello di evidenziare le caratteristiche che ne favoriscono la diffusione. Quest’ ultime sono generalmente descritte dai ‘tratti funzionali’, definiti come caratteristiche morfologiche, fisiologiche o fenologiche, misurabili in un individuo dal livello ce

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Macdonald, Ian Angus William. "Conservation implications of the invasion of southern Africa by alien organisms." Doctoral thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/17136.

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Bibliography: pages 792-808.<br>Alien species known to be invading untransformed ecosystems in southern Africa, and, more particularly, those inside nature reserves, were identified. The extent and ecological impacts of these invasions were assessed. Their control within reserves was also evaluated. Research approaches used were; literature review (which included an international review), a detailed questionnaire survey of alien plant invasions in 307 reserves, rapid field surveys of 60 reserves, intensive case studies of four reserves (Cape of Good Hope Nature Reserve, Hluhluwe-Umfolozi Game

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Comont, Richard Francis. "Modelling the impact of an alien invasion : Harmonia axyridis in Britain." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:08de972b-1c12-4862-bb7d-95d614a9e011.

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Harmonia axyridis is a ladybird native to Asia, but introduced widely as a biocontrol agent. It is invasive and detrimental to native species in North America, which meant its arrival in Britain was met with concern. Establishment was seen as an opportunity to track the spread of an invasive alien species (IAS) whilst also monitoring impacts on native species. The aims of this thesis were to examine the responses of native British ladybirds to the arrival of H. axyridis, to establish the effect of the IAS on native ladybirds when compared to other drivers, and to investigate the possible facil

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William), Van Wilgen B. W. (Brian. "The conservation of southern African terrestrial ecosystems, with special reference to the role of fire and the control of invasive alien plants." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/48061.

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Svensson, Elin, and Karin Wetterberg. "En ny däggdjursart i Sveriges fauna : Etablering av stenmård (Martes foina) i nordöstra Skåne." Thesis, Högskolan Kristianstad, Fakulteten för naturvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-22586.

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Skogsmård (Martes martes) har länge varit Sveriges enda mårdart men 2018 gjordes det första fyndet av en annan art, stenmård (Martes foina), i nordöstra Skåne. Efter att detta fynd uppmärksammats fick Invasiva Arter på Svenska Jägareförbundet in uppgifter om ytterligare tre fynd från området. Syftet med studien var således att undersöka om stenmård är en etablerad art i nordöstra Skåne samt att undersöka om det finns släktskap mellan de funna individerna. Utifrån tidigare fyra fynd utfördes en fältstudie för att försöka samla in ytterligare fynd av stenmård i nordöstra Skåne, med hjälp av fäll

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Phillips, Ben Lee. "Evolution and impact of invasive species : cane toads and snakes in Australia." University of Sydney. School of Biological Sciences, 2004. http://hdl.handle.net/2123/611.

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Evolution can occur rapidly, along timescales that are traditionally regarded as 'ecological'. Despite growing acceptance among biologists of rapid evolution, a strong paradigm of contemporary evolution is still absent in many sub-disciplines. Here I apply a contemporary evolution viewpoint to conservation biology. Specifically, I examine the impact of cane toads (Bufo marinus) on Australian snakes. Toads were introduced into Australia in 1935, have spread rapidly and represent a novel, extremely toxic prey item to na�ve Australian predators (including snakes). Based on dietary preference

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Loftus, Wynand Johan. "Strategic adaptive management and the efficiency of invasive alien plant management in South African national parks." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020089.

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It is well known that invasive alien plants (IAPs) pose a significant threat to natural biodiversity and human well-being. Through various pressures exerted on natural ecosystems, IAPs decrease and alter natural processes that provide important ecosystems services and livelihoods to human communities. These plants also displace and out-compete natural plant communities in the areas in which they invade. Management of IAPs is a complex issue with social, environmental and financial challenges. The long-term sustainable management of IAPs requires a management approach that monitors and measures

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Phiri, E. E. "Species occupancy, distribution and abundance : indigenous and alien invasive vascular plants on sub-Antarctic Marion Island." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/47001.

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Thesis (MSc)--Stellenbosch University, 2008.<br>ENGLISH ABSTRACT: Macroecological relationships have rarely been studied at wide spatial scales and across geographic ranges of species in the field in the sub-Antarctic. In this thesis I examined the occupancy, distribution and abundance, and the relationships thereof, of indigenous plants and alien species at broad (island-wide) and fine scales across sub-Antarctic Marion Island. The impacts of alien species and their interactions with indigenous plants were also investigated. I examined the nature of the abundance structure of a cushion-formi

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Johansson, Oskar. "Invasiva främmande arter: försiktighetsprincipen som förutsättning för effektiva åtgärder." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74632.

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Biological diversity is an essential prerequisite for life on earth and for the function of its ecosystems. Without biological diversity the ecosystems will eventually collapse, and it is thus necessary to maintain a healthy level of variation at ecological-, species- and genetic- level. Invasive alien species (IAS) are now recognized as the second highest threat to biological diversity. As a result, new legislation aiming to counteract the increasing issues with IAS are introduced e.g. in the EU. The purpose of this essay is to evaluate the function and importance of the precautionary princip

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Dixon, Gemma Michelle. "Allelopathic potential of the alien invader weed Campuloclinium macrocephalum(Less) D.C." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-10052009-111802/.

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Scarr, Lowell Martin. "Assessing the value of public investment into biological control research for invasive alien plants : the ARC PPRI Weeds Research Division." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/d1020604.

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This study investigates the economic impact of the ARC PPRI Weeds Research Division. The Division researches appropriate methods of biological control for invasive alien plants (IAPs). These plants pose an increasing threat to environmental integrity and ecosystem service provision impacting on economic potential. Since the work of the Division is considered a public good, a predominantly descriptive approach has been adopted for the valuation process. A combination of quantitative cost analysis and a qualitative study of the impacts of research and invasive alien plants is used to deal with t

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PIEMONTESE, LUCIA. "Identificazione e analisi della struttura di popolazione della specie aliena invasiva Halyomorpha halys (Hemiptera, Pentatomidae) mediante approcci molecolari." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2020. http://hdl.handle.net/11380/1199940.

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Le specie aliene invasive possono influenzare negativamente le componenti biotiche e abiotiche delle aree di introduzione, alterare le comunità ecologiche, favorire la diffusione di patogeni e/o malattie determinando gravi danni alla biodiversità, salute ed economia. Capire le dinamiche alla base del processo di invasione, nei suoi aspetti teorici e pratici, è la chiave per prevenire ulteriori invasioni e per migliorare la gestione delle specie introdotte evitando effetti avversi sull’ambiente e sulla biodiversità locale. La cimice marmorizzata bruna, Halyomorpha halys (Hemiptera, Heteroptera

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