Rozprawy doktorskie na temat „Non-native species”
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Anderson, Lucy Grace. "Managing aquatic non-native species : the role of biosecurity". Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/8679/.
Pełny tekst źródłaHolenstein, Kathrin. "Permeability of European Protected Areas to Non-Native Species". Thesis, Université de Montpellier (2022-….), 2022. http://www.theses.fr/2022UMONG015.
Pełny tekst źródłaProtected areas are among the key elements of global biodiversity conservation strategies and aim to conserve native species, habitats and ecosystems. Globalisation has led to increased introductions of species outside their natural range. In their new environment, some of these non-native species have the potential to affect ecosystems and compete with or threaten native species. The environment in close proximity to protected areas is likely to be the stepping stone for non-native species to become established in protected areas. However, little is known about the role that protected area surroundings play in the permeability of protected areas to non-native species. In this thesis, I focused on protected areas and their surrounding belts to address the issue of permeability to non-native species. Examining protected areas in Norway, I showed that non-native species surrounding protected areas have a qualitative impact on the community of non-native species in protected areas. Moreover, the proportion of invasive species was higher in protected areas (40 %) compared to their belts (12 %). The number of non-native species in the surrounding areas also significantly determined the number of non-native species in protected areas. I have also highlighted the dynamics of colonization from the belts to the protected areas by showing that non-native species were detected in the protected areas on average several years after they were recorded in the belts. In addition, I showed in four European countries that the type of land use and land cover in the proximity and within protected areas plays a central role in the establishment of non-native species in protected areas. Anthropogenic land use and land cover around protected areas promoted the establishment of non-native species inside protected areas, regardless of the land use and land cover present in them. Finally, I investigated the colonization dynamics of Acacia dealbata, an invasive t ree species, in and around protected areas in central Portugal over the last twenty years. I showed that disturbances by fires and the loss of tree cover had a significant positive effect on the presence of the species. This thesis highlights the importance of the protected area surroundings for the colonization of non-native species. This is particularly relevant for future management strategies for non-native species in protected areas
Cassey, Phillip, i n/a. "Comparative Analyses of Successful Establishment Among Introduced Land Birds". Griffith University. Australian School of Environmental Studies, 2002. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030915.094001.
Pełny tekst źródłaIgnace, Danielle Denise. "Functional Responses of Sonoran Desert Plant Species to Precipitation". Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/196132.
Pełny tekst źródłaCassey, Phillip. "Comparative Analyses of Successful Establishment Among Introduced Land Birds". Thesis, Griffith University, 2002. http://hdl.handle.net/10072/366398.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Australian School of Environmental Studies
Science, Environment, Engineering and Technology
Full Text
Henkanaththegedara, Sujan Maduranga. "Ecological Complexity of Non-Native Species Impacts in Desert Aquatic Systems". Diss., North Dakota State University, 2012. https://hdl.handle.net/10365/26697.
Pełny tekst źródłaKiger, Sarah. "Competitive ability of native and non-native prairie species in response to soil nitrogen and density". Connect to resource, 2006. http://hdl.handle.net/1811/6621.
Pełny tekst źródłaTitle from first page of PDF file. Document formatted into pages: contains 21 p.; also includes graphics. Includes bibliographical references (p. 12-13). Available online via Ohio State University's Knowledge Bank.
anderson, kaylee. "Using Linear Mixed Models to Analyze Native and Non-Native Species Abundances in Coastal Sage Scrub". Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/scripps_theses/807.
Pełny tekst źródłaFincham, William Norman Whitlock. "Quantifying the impacts of invasive non-native species using key functional traits". Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/21380/.
Pełny tekst źródłaPaulson, Brandon. "Ex Situ Analyses of Non-Native Species Impacts on Imperiled Desert Fishes". Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/29890.
Pełny tekst źródłaNevada State Wildlife Grant
North Dakota State University. Environmental and Conservation Science Program
Desert Fish Council
Gandy, David A. "Examining Gradients in Novelty: Native and Non-native Fish Assemblages in Everglades Canals". FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/951.
Pełny tekst źródłaMullins, Lydia R. "Testing the effects of glyphosate and a possible tradeoff with immunity on native and non-native species of crickets". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587642768787223.
Pełny tekst źródłaMugnai, Francesco. "Exploring the distribution and underlying drivers of native and non-native mussel and oyster species in harbour environment". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14697/.
Pełny tekst źródłaMarr, Sean Murray. "Conservation of the native freshwater fishes of the Cape floristic region (South Africa) : management of non-native species". Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/13517.
Pełny tekst źródłaFreshwater fishes are among the most threatened taxa in the world. Increasing demand for freshwater, habitat degradation and the introduction of non-native species, will continue to place pressure on the remaining native freshwater fishes. A meta-analysis estimated that more than 90% of river habitat in three major catchments has been invaded by non-native fish and that catchments covering less than 1% of Cape Floristic Region have no recorded non-native fish introductions, the major rivers containing 10 or more non-native species. The majority of the native fishes continue to be threatened by the presence of non-native fish.
Richards, Jeannine Hyde. "From 'useful and interesting' to 'evil invaders': evolving perceptions of non-native species in the United States". Thesis, Boston University, 2002. https://hdl.handle.net/2144/27749.
Pełny tekst źródłaPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
2031-01-02
Turner, Brian Christopher. "Responses of Aquatic Non-Native Species to Novel Predator Cues and Increased Mortality". PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3620.
Pełny tekst źródłaRielly, Elizabeth W. "Invertebrate colonization and plant architecture: The influence of two non-native milfoil species". VCU Scholars Compass, 2009. https://scholarscompass.vcu.edu/etd/5604.
Pełny tekst źródłaFeitosa, Mateus Ferrareze [UNESP]. "Análise comparativa da dieta, seletividade alimentar e estrutura da ictiofauna, juvenis e espécies de pequeno porte, em lagoas marginais do reservatório de Rosana (Rio Paranapanema, SP/PR)". Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/106478.
Pełny tekst źródłaCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O presente estudo foi conduzido em quatro lagoas marginais da porção superior do reservatório de Rosana, bem como no canal principal do rio Paranapanema. O objetivo do primeiro capítulo foi analisar a composição e os atributos ecológicos das assembléias fitoplanctônicas, recurso trófico primário das cadeias alimentares aquáticas. O segundo capítulo trata da comunidade zooplanctônica (Cladocera e Copepoda) e sua distribuição nos ambientes analisados. O terceiro trabalho procura avaliar se a introdução de uma espécie exótica de peixe (Cichla kelberi) pode causar alterações na estrutura da ictiofauna local, com uma possível redução da sua diversidade. Por fim, o quarto capítulo refere-se à alimentação da ictiofauna de pequeno porte, através da análise da dieta e do hábito alimentar das espécies, considerando principalmente a importância da comunidade planctônica para essa fauna. O número total de táxons de fitoplâncton identificados foi de 283. Zygnemaphyta foi o grupo com maior número de espécies, seguido por Chlorophyta e Bacillariophyta. Maior riqueza, abundância e biomassa de fitoplâncton foram observadas nas lagoas, especialmente durante o período chuvoso. O número total de táxons de zooplâncton identificados foi de 72. As lagoas laterais e o período chuvoso apresentaram maior abundância de organismos. Calanoida foi o grupo dominante nas assembléias zooplanctônicas. Os resultados mostraram que no sistema de lagoas laterais as comunidades são controladas por mecanismos ascendentes (“bottom-up”). Um total de 4693 peixes, pertencentes a 43 espécies foram amostrados. A Ordem Characiformes foi a mais abundante, seguida por Perciformes e Siluriformes. Não houve diferenças estatísticas na riqueza, na abundância, na biomassa, na média do comprimento, na composição das assembléias e na diversidade de peixes, comparando-se o período...
The study was carried out in four lateral lagoons of the tail region of Rosana reservoir, as well as in the river/reservoir main channel. The aim of the first chapter of the thesis was to analyze the composition and ecological attributes of the phytoplankton assemblages, primordial trophic resource of the aquatic food chains. The second chapter is focused on the zooplankton community (Cladocera and Copepoda) and their distribution in the study environments. The third chapter tries to assess whether the introduction of a non native fish species (Cichla kelberi) may promote alterations in the local ichthyofauna, with a possible reduction in its diversity. Finally, the last chapter discusses the ichthyofauna feeding, through the analysis of diet and feeding behavior of fish, considering mainly the importance of plankton organisms as a resource. The total number of phytoplankton taxa identified was of 283. Zygnemaphyta was the most specious group, followed by Chlorophyta and Bacillariophyta. Higher richness, abundance and biomass were observed in the lagoons, especially during the rainy period. The total number of zooplankton taxa was 72. Higher zooplankton abundance was observed in the lateral lagoons and in the rainy period. Calanoids were the dominant group in the zooplankton assemblages. The results indicated that in the lateral lagoons system, the communities are controlled by bottom-up mechanisms. A total of 4,693 fish, belonging to 43 species was sampled between 2004 and 2009. The order Characiformes was the most abundant, followed by Perciformes and Siluriformes. There were no differences in composition, richness, abundance, biomass, mean length and diversity, when compared the periods previous and after the introduction of Cichla. The results showed that the feeding of the river fish assemblages was different from the lagoons... (Complete abstract click electronic access below)
Townhill, Bryony Lindsey. "Marine species and climate change : using modelling techniques to investigate effects on species distributions". Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/25283.
Pełny tekst źródłaBrummer, Tyler Jacob. "Non-native species distributions in space and time: integrating ecological theory and predictive modeling". Thesis, Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/brummer/BrummerT0512.pdf.
Pełny tekst źródłaBlack, Devin E. "MANAGING UPLAND OAK FORESTS WITH DISTURBANCE AND THE IMPLICATIONS FOR NON-NATIVE SPECIES INVASIONS". UKnowledge, 2017. http://uknowledge.uky.edu/forestry_etds/32.
Pełny tekst źródłaGwinn, R. Nathan, i John L. Koprowski. "Differential response to fire by an introduced and an endemic species complicates endangered species conservation". ASSOC TERIOLOGICA ITALIANA, 2016. http://hdl.handle.net/10150/625219.
Pełny tekst źródłaYuan, Wei. "The effects of non-native species on two life-stages of the Eastern oyster Crassostrea virginica". Master's thesis, University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6389.
Pełny tekst źródłaM.S.
Masters
Biology
Sciences
Biology
Sleezer, Logan John. "Abundance Trends and Drivers of Change in Freshwater Fish Communities of the New River Basin". Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99149.
Pełny tekst źródłaMaster of Science
Freshwater fishes are experiencing world-wide declines that have the potential to cause major negative ecological and economic impacts. Two of the biggest contributors to fish declines are habitat destruction and non-native species introductions. I examined populations of numerous fish species in the New River basin (NRB) in the Appalachian region of the United States to identify declining native species and determine how intensive land use (one type of habitat destruction) and non-native species may be contributing to these trends. My results suggest that nearly half of the native species occurring in the NRB may be experiencing widespread reductions in abundance. As a result of these declines and the spread of a few common native and non-native species, fish communities across the NRB are becoming less unique over time. Land-use changes, such as agricultural and road development near streams, which contribute to increased soil erosion and run-off of silt and sand into streams, could be causing broad habitat changes that lead to diminished populations of sensitive species and overall local and regional fish diversity. While no single non-native species may be held responsible for all native fish species declines in the NRB, complex interactions, such as competition and predation, between many natives and non-natives altogether could be contributing to many native fish declines. Farmers and other landowners can help to prevent future fish declines by re-establishing natural vegetation, such as trees, along streambanks and implementing other practices, such as cattle fencing, that reduce the streambank and soil erosion that harms fish habitat. Other stakeholders, such as anglers, can help prevent future native fish declines by limiting introductions of additional non-native species. For example, these stakeholders could avoid releasing aquatic pets and live bait into NRB streams. These practices would help limit future negative impacts caused by non-native species.
Zschille, Jana. "A non-native carnivore living in a cultural landscape". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-225104.
Pełny tekst źródłaDer Einfluss invasiver, gebietsfremder Arten wird neben der Habitatzerstörung als eine der größten Gefährdungen der Biodiversität weltweit angesehen. Sowohl internationale Umweltvereinbarungen als auch die nationale Gesetzgebung fordern daher Maßnahmen, die eine weitere Ausbreitung bereits etablierter invasiver Neozoen verhindern und deren negative Einflüsse minimieren. Die vorliegende Studie befasst sich mit einer dieser Neozoen - dem Amerikanischen Nerz bzw. Mink (Neovison vison). Um Erkenntnisse zu Ökologie und Verhalten des semiaquatischen Musteliden in Deutschland zu gewinnen, wurden Daten zu tages- und jahreszeitlichen Aktivitätsmustern, zu Raumnutzung und Territorialsystem sowie zur Nahrungswahl und den jahreszeitlichen Unterschieden im Beutespektrum der Art erhoben. Dafür konnten in den Jahren 2003 bis 2006 in einem Fischteich-Gebiet in Mecklenburg-Vorpommern, wo sich Minke bereits seit den 1970er Jahren etabliert haben, insgesamt 14 Individuen (neun Männchen, fünf Weibchen) radiotelemetrisch überwacht werden. Anhand der Ergebnisse wird einerseits der potentielle Einfluss des gebietsfremden Raubsäugers auf einheimische Arten abgeschätzt und diskutiert. Andererseits werden die Ergebnisse herangezogen, um effektive Monitoring- und Managementmaßnahmen abzuleiten. Eine methodische Evaluation von Halsbandsendern zeigte, dass in sechs von acht Fällen die getesteten Halsbänder, die aufgrund des sehr ähnlichen Hals-Kopf-Umfanges der Individuen relativ eng angelegt werden müssen, Hautverletzungen verursachten. Infolgedessen wurden die Halsbandsender gegen durch Tierärzte operativ in die Bauchhöhle eingesetzte Implantationssender ausgetauscht. Auch bei allen nachfolgend gefangenen Tieren wurden die Sender implantiert. Bei insgesamt 14 durchgeführten Erstimplantationen beeinflussten mit Ausnahme eines Falles (Tod durch Aufbeißen der Naht) die Implantate weder das Überleben, noch die Reproduktion der Minke. Daher ist v.a. in Hinblick auf Tierschutzaspekte die Senderimplantation (in Kombination mit einer Mehrtages-Quarantäne) anstatt der Verwendung von externen Halsbandsendern zu empfehlen. Die Analyse der circannuellen Aktivitätsmuster ergab signifikante Unterschiede der saisonalen Aktivitätsraten. Während der kalten Wintermonate (Oktober bis Februar) zeigten beide Geschlechter mit durchschnittlich etwa 23 % eine vergleichsweise geringe Aktivität. Diese energiesparende Verhaltensweise war möglich, da auch im Winter ein ausreichend hohes Nahrungsangebot, vor allem an Fisch, vorhanden war. Im März kam es sowohl bei den Männchen als auch bei den Weibchen zu einem durch die Paarungszeit verursachten, beträchtlichen Anstieg der mittleren Aktivitätsraten auf fast 40 %. In den Sommermonaten (Mai bis August) waren die weiblichen Tiere, durch die Anforderungen der Jungenaufzucht bedingt, anhaltend häufig aktiv (zwischen 40 und 50 %). Die Aktivitätsraten der nicht an der Jungenaufzucht beteiligten Männchen dagegen nahmen im April wieder ab, um bis zum Juli auf einem vergleichsweise geringen Niveau von etwa 30 % zu bleiben. Sie stiegen jedoch während der Monate August und September erneut auf etwa 43 % an. Zu dieser Zeit wandern gewöhnlich die Jungtiere ab und suchen sich ein eigenes Streifgebiet (= Aktionsraum), dadurch kommt es zu Änderungen im Territorialsystem und damit einhergehenden innerartlichen Auseinandersetzungen. Beide Geschlechter unterscheiden sich stark in ihren tageszeitlichen Aktivitätsrhythmen. Alle Weibchen waren ganzjährig tagaktiv. Von den fünf untersuchten Männchen zeigten drei typische Nachtaktivität im gesamten Jahresverlauf. Die beiden anderen männlichen Tiere verhielten sich in ihren Aktivitätsrhythmen indifferent, sie zeigten das ganze Jahr über keine Präferenzen für eine bestimmte Tageszeit. Die geschlechtsspezifischen Unterschiede sowohl in den circannuellen als auch in den circadianen Aktivitätsmustern spiegeln zum einen die verschiedenen Anforderungen an die Geschlechter wieder, vor allem die Investitionen in die Fortpflanzung. Zum anderen können die geschlechtsspezifisch unterschiedlichen Zeitnutzungs-Strategien zu einer Minimierung der innerartlichen, vorzugsweise der intersexuellen Konkurrenz führen. Die Analyse der Telemetriedaten hinsichtlich Raumnutzung und Territorialsystem ergab im Vergleich zu anderen europäischen Studien relativ große individuelle Aktionsräume verbunden mit einer geringen Populationsdichte im Untersuchungsgebiet. So erstreckten sich die durchschnittlich genutzten Sommerstreifgebiete der Männchen auf 15,4 km und die der Weibchen auf 9,3 km Flusslauf bzw. Teichufer. Entsprechend dem Trend der saisonalen Aktivitätsmuster, reduzierten beide Geschlechter ihre großen Sommerstreifgebiete während der Winterhalbjahre um mehr als die Hälfte der Fläche. Allerdings nutzten die Männchen zu allen Jahreszeiten wesentlich größere Aktionsräume als die weiblichen Minke. Große Streifgebietsüberlappungen zwischen den Geschlechtern sowie verhältnismäßig niedrige Überlappungsraten der benachbarten Streifgebiete von Tieren des gleichen Geschlechts bestätigen die intrasexuelle Territorialität der Art. Die erheblichen Unterschiede der saisonalen und geschlechtsspezifischen Aktionsraumgrößen werden vermutlich durch die ermittelte, vergleichsweise geringe Populationsdichte (0,6-0,7 Individuen/km2) ermöglicht. Die ausgedehnte und sich fast über das gesamte Untersuchungsgebiet erstreckende Raumnutzung der Männchen während der Paarungszeit ist durch die Suche nach fortpflanzungsbereiten Weibchen bedingt. Die Raumnutzung der untersuchten Minke unterliegt einer hohen Dynamik, dies wird durch die häufige räumliche Verschiebung temporär stabiler Streifgebiete innerhalb einer Jahreszeit oder auch zwischen den gleichen Jahreszeiten aufeinanderfolgender Jahre verdeutlicht. All diese ermittelten charakteristischen Besonderheiten im Raum-Zeit-Verhalten der Art sollten bei der Entwicklung von Monitoring- und Managementkonzepten berücksichtigt werden. So müssen beispielsweise bei der Fallenjagd im Winter die zu dieser Zeit stark verkleinerten Streifgebiete und die reduzierten Aktivitätsraten Beachtung finden. Die Analyse der über 2500 Losungsproben telemetrierter Minke zeigte, dass sich die untersuchten Tiere hauptsächlich von Fisch, Kleinsäugern und Vögeln (inklusive deren Eiern) ernährten. Dabei traten allerdings signifikante saisonale Unterschiede in der Nahrungs-zusammensetzung auf. So wurden im Frühjahr die drei Beutekategorien Fisch, Kleinsäuger sowie Vögel und deren Eier in ähnlichen Anteilen erbeutet. Während des Sommers bildeten Vögel und Vogeleier die Hauptbeute, gefolgt von Kleinsäugern. Im Herbst verringerte sich der Vogel- und Kleinsäugeranteil im Beutespektrum zugunsten von Fisch. Dieser Trend setzte sich bis in den Winter fort; in dieser Jahreszeit ernährten sich die Minke fast ausschließlich von Fisch. Amphibien, Reptilien, Krebstiere, Insekten und Mollusken wurden im gesamten Jahresverlauf nur gelegentlich gefressen. Innerhalb der Gruppe der Vögel prädierten die Minke vor allem Blässhühner (Fulica atra), gefolgt von Stockenten (Anas platyrhynchos). Das Kleinsäuger-Beutespektrum wurde eindeutig von der Schermaus (Arvicola terrestris) dominiert und unter den Fischen erbeuteten die Minke vorzugsweise Flussbarsche (Perca fluviatilis), Plötzen (Rutilus rutilus) und Karpfen (Cyprinus carpio). Die Ergebnisse der Nahrungsanalyse bestätigen den Mink als einen opportunistischen Prädator, der seine Beutetiere je nach Verfügbarkeit bzw. dem erforderlichen Jagdaufwand nutzt. Trotz des hohen Fischanteils in der Herbst- und Winternahrung ist der durch den Mink verursachte ökonomische Schaden schätzungsweise relativ gering. Flussbarsch und Plötze wurden in höheren Frequenzanteilen erbeutet als der wirtschaftlich relevante Karpfen. Die starke Prädation von Wasservögeln und deren Eiern besonders in den Frühjahrs- und Sommermonaten weist allerdings auf einen potentiell negativen Einfluss des invasiven Raubsäugers auf diese Tiergruppe hin. Zusammenfassend lässt sich festhalten, dass die spezifischen Charakteristika des anthropogen geprägten Untersuchungsgebietes sowohl Nahrungsökologie und Aktivitätsmuster als auch Raumnutzung und Populationsdichte der lokalen Minkpopulation beeinflussen. Eine besondere Rolle hierbei spielt die Bewirtschaftung der Fischteiche, denn vor allem daraus resultiert für die Minke eine saisonal unterschiedliche Verfügbarkeit an Lebensraum und Nahrung. Negative Auswirkungen des Amerikanischen Nerzes auf die einheimische Tierwelt wurden in anderen europäischen Ländern belegt und rechtfertigen die Einstufung dieser Art als „invasiv“. Demzufolge wird in der vorliegenden Arbeit ein Management empfohlen, bei dem der Focus auf einem effektiven Monitoring und gegebenenfalls auf zweckmäßigen, an die lokalen Bedingungen angepassten Fang- oder Abwehrmaßnahmen liegt. Zudem sollten, um einer weiteren Ausbringung in das Freiland vorzubeugen, die wenigen noch existierenden Minkfarmen besser gegen Ausbrüche bzw. Freilassungsaktionen gesichert werden. Langfristig ist ein generelles Besitz- und Vermarktungsverbot für die Art wünschenswert
Schwartz, Lauren Michele. "The competitive response of Panicum virgatum cultivars to non-native invasive species in southern Illinois". OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/765.
Pełny tekst źródłaNash, Ethan Fletcher. "Understanding the invasion of Florida's intertidal Crassostrea virginica reefs by non-native marine invertebrate species". Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4994.
Pełny tekst źródłaID: 029809008; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.)--University of Central Florida, 2011.; Includes bibliographical references (p. 64-67).
M.S.
Masters
Biology
Sciences
Gallant, Luke Howard. "Characterizing native palatable legume and non-legume species in the rangelands of the Overberg area". University of the Western Cape, 2020. http://hdl.handle.net/11394/7866.
Pełny tekst źródłaThe Overberg renosterveld rangelands of the Cape Floristic Region (CFR) has become well associated with commercial and communal agricultural practices, namely crop and livestock production. This Mediterranean region is characterized as being a semi-arid, winter rainfall area with nutrient-limited soils. Livestock farmers rely largely on introduced legume species such as lucerne (Medicago sativa) as high quality forage to sustain their livestock’s diets. Generally, these introduced species are reliant on the accessibility of water and nutrients, due to the specific climatic and edaphic conditions of the region. The availability of high quality forage has always been a major concern to farmers when it comes to managing their livestock, since livestock productivity is determined by the quality of the forage consumed.
Savage, Matthew B. "A NON-NATIVE FOREST INVADER ALTERS FOREST STRUCTURE AND THE ASSOCIATED ARTHROPOD COMMUNITY". UKnowledge, 2017. http://uknowledge.uky.edu/entomology_etds/41.
Pełny tekst źródłaLehr, Gavin Charles, i Gavin Charles Lehr. "Symbiosis in the Context of an Invasive, Non-Native Grass: Fungal Biodiversity and Student Engagement". Thesis, The University of Arizona, 2018. http://hdl.handle.net/10150/626728.
Pełny tekst źródłaFeitosa, Mateus Ferrareze. "Análise comparativa da dieta, seletividade alimentar e estrutura da ictiofauna, juvenis e espécies de pequeno porte, em lagoas marginais do reservatório de Rosana (Rio Paranapanema, SP/PR) /". Botucatu : [s.n.], 2011. http://hdl.handle.net/11449/106478.
Pełny tekst źródłaBanca: Lilian Casatti
Banca: Mário Luís Orsi
Banca: Ricardo Motta Pinto Coelho
Banca: Ângelo Antônio Agostinho
Resumo: O presente estudo foi conduzido em quatro lagoas marginais da porção superior do reservatório de Rosana, bem como no canal principal do rio Paranapanema. O objetivo do primeiro capítulo foi analisar a composição e os atributos ecológicos das assembléias fitoplanctônicas, recurso trófico primário das cadeias alimentares aquáticas. O segundo capítulo trata da comunidade zooplanctônica (Cladocera e Copepoda) e sua distribuição nos ambientes analisados. O terceiro trabalho procura avaliar se a introdução de uma espécie exótica de peixe (Cichla kelberi) pode causar alterações na estrutura da ictiofauna local, com uma possível redução da sua diversidade. Por fim, o quarto capítulo refere-se à alimentação da ictiofauna de pequeno porte, através da análise da dieta e do hábito alimentar das espécies, considerando principalmente a importância da comunidade planctônica para essa fauna. O número total de táxons de fitoplâncton identificados foi de 283. Zygnemaphyta foi o grupo com maior número de espécies, seguido por Chlorophyta e Bacillariophyta. Maior riqueza, abundância e biomassa de fitoplâncton foram observadas nas lagoas, especialmente durante o período chuvoso. O número total de táxons de zooplâncton identificados foi de 72. As lagoas laterais e o período chuvoso apresentaram maior abundância de organismos. Calanoida foi o grupo dominante nas assembléias zooplanctônicas. Os resultados mostraram que no sistema de lagoas laterais as comunidades são controladas por mecanismos ascendentes ("bottom-up"). Um total de 4693 peixes, pertencentes a 43 espécies foram amostrados. A Ordem Characiformes foi a mais abundante, seguida por Perciformes e Siluriformes. Não houve diferenças estatísticas na riqueza, na abundância, na biomassa, na média do comprimento, na composição das assembléias e na diversidade de peixes, comparando-se o período... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The study was carried out in four lateral lagoons of the tail region of Rosana reservoir, as well as in the river/reservoir main channel. The aim of the first chapter of the thesis was to analyze the composition and ecological attributes of the phytoplankton assemblages, primordial trophic resource of the aquatic food chains. The second chapter is focused on the zooplankton community (Cladocera and Copepoda) and their distribution in the study environments. The third chapter tries to assess whether the introduction of a non native fish species (Cichla kelberi) may promote alterations in the local ichthyofauna, with a possible reduction in its diversity. Finally, the last chapter discusses the ichthyofauna feeding, through the analysis of diet and feeding behavior of fish, considering mainly the importance of plankton organisms as a resource. The total number of phytoplankton taxa identified was of 283. Zygnemaphyta was the most specious group, followed by Chlorophyta and Bacillariophyta. Higher richness, abundance and biomass were observed in the lagoons, especially during the rainy period. The total number of zooplankton taxa was 72. Higher zooplankton abundance was observed in the lateral lagoons and in the rainy period. Calanoids were the dominant group in the zooplankton assemblages. The results indicated that in the lateral lagoons system, the communities are controlled by bottom-up mechanisms. A total of 4,693 fish, belonging to 43 species was sampled between 2004 and 2009. The order Characiformes was the most abundant, followed by Perciformes and Siluriformes. There were no differences in composition, richness, abundance, biomass, mean length and diversity, when compared the periods previous and after the introduction of Cichla. The results showed that the feeding of the river fish assemblages was different from the lagoons... (Complete abstract click electronic access below)
Doutor
Selge, Sebastian. "Public and scientific discourses on biological invasions : social representations of invasive non-native species in Scotland". Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=183833.
Pełny tekst źródłaliu, xian. "PREDICTION OF NON-NATIVE INVASIVE PLANT SPECIES OCCURRENCES IN RELATION TO ENVIRONMENTAL VARIABLES IN SOUTHERN ILLINOIS". OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1911.
Pełny tekst źródłaKinghorn, James Wolmarans. "The value of non-native fish species : a study of recreational angling in the Amathole district". Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001456.
Pełny tekst źródłaJukes, Alison Rosemary. "The establishment of non-native plant species in relation to climate and land use in Britain". Thesis, University of York, 2013. http://etheses.whiterose.ac.uk/6257/.
Pełny tekst źródłaGates, Kiza Kristine. "Coexistence between a native (Valvata humeralis) and a non-native (Potamopyrgus antipodarum) gastropod in the Middle Snake River, Idaho: implications for invasive species impact". Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/gates/GatesK0812.pdf.
Pełny tekst źródłaLieurance, Deah. "MECHANISMS OF SUCCESS: PLANT-HERBIVORE INTERACTIONS AND THE INVASION OF NON-NATIVE LONICERA SPECIES IN NORTH AMERICA". Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1363949172.
Pełny tekst źródłaPollnac, Fredric Winslow. "Non-native plant species in mountainous areas: a case study of Linaria dalmatica in the greater Yellowstone ecosystem". Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/pollnac/PollnacF0512.pdf.
Pełny tekst źródłaMacleod, Adrian K. A. "The role of marine renewable energy structures and biofouling communities in promoting self-sustaining populations of non-native species". Thesis, University of the Highlands and Islands, 2013. https://pure.uhi.ac.uk/portal/en/studentthesis/the-role-of-marine-renewable-energy-structures-and-biofouling-communities-in-promoting-selfsustaining-populations-of-nonnative-species(0c7f0d89-74e8-4468-83c9-4216e4f2b1a8).html.
Pełny tekst źródłaKovalenko, Katya. "Indirect effects of invasive species community effects of invasive aquatic plant control and direct and indirect effects of non-native peacock bass /". Diss., Mississippi State : Mississippi State University, 2009. http://library.msstate.edu/etd/show.asp?etd=etd-06252009-203011.
Pełny tekst źródłaPagès, Marie. "Partnerships between professionals and amateurs in nature conservation : an examination of motivations and discourses in the management of invasive non-native species". Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231663.
Pełny tekst źródłaHunter, Bailey A. "Allelopathic Impact of Three Non-Native Invasive Species on the Early Growth ofHybrids of American Chestnut (Castanea dentata (Marsh.) Borkh.)". Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1427883974.
Pełny tekst źródłaChoi, Ryan T. "Invertebrate Community Changes Along Coqui Invasion Fronts in Hawaii". DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/956.
Pełny tekst źródłaOliveira, Catarina Chemetova Cravo Branco. "Valorisation of forest biomass side-streams in add value green products for horticultural industry". Doctoral thesis, ISA, 2020. http://hdl.handle.net/10400.5/21210.
Pełny tekst źródłaHorticulture industry uses peat as the main constituent in growing media formulations due to its ability to support efficient plant production. However, peat is a non-renewable resource at its actual extraction rate, and environmental issues associated with greenhouse gases emission from peat harvest raised peatland ecosystem conservation awareness through environmental initiatives, organizations and politics worldwide, limiting its use. There has been an increasing demand for environmentally friendly peat alternatives focused on locally available, organic and renewable materials from industrial side-streams, mainly wood-based and forest biomass. Therefore, woody raw-materials physical, chemical and biological properties are important to determinate further pre-treatment identification and choice. This work evaluates bark-based growing media suitability from non-native forest species in Mediterranean region, Acacia melanoxylon – residual biomass from invasive species control – and Eucalyptus globulus – a pulpwood industrial waste-stream. Ageing, a zero-waste treatment, allowed A. melanoxylon mature bark to effectively replace half of container medium volume as peat alternative. Low-temperature hydrothermal treatment, a faster process, enabled E. globulus bark to substitute quarter container medium volume, ensuring equal plant performance as commercial material. Both raw-materials sieve size manipulation promoted its incorporation as aeration growing media component. Given the wood-based raw-materials nature, Nitrogen amendment should be provided according to plant and cultivation system’s needs. Furthermore, by replacing the ‘end-of-life’ biomass material into new potential horticultural products, circular economy approach was applied throughout this study. Thus, A. melanoxylon juvenile bark extracts phytotoxic effect showed a promising non-synthetic and natural bio-herbicide for weed control. In response to the potential circularity of invasive species biomass resources into add-value horticultural products, the present study outcome underlines Acacia species biomass commercial valorisation as alternative management tool to support the costs of control, avoiding the potential risk of conflict between economic exploitation and negative environmental impact
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Emsweller, Lauren N. "EFFECTS OF TREEFALL GAPS AND SOIL DISTURBANCE ON THE INVASION OF FOUR NON-NATIVE PLANT SPECIES IN A MATURE UPLAND FOREST IN MARYLAND". Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1448642622.
Pełny tekst źródłaGodfrey, Thomas George. "On the floral rewards and flower-visitor assemblages of annual urban flower meadow seed mixes". Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28945.
Pełny tekst źródłaSilva, Rui Manuel Roque da. "Using data from citizen-science to monitor bird invasions". Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/23690.
Pełny tekst źródłaAdelino, Denise Isabel Gaiato. "Bio-contaminação da fauna piscícola em rios de tipo mediterrânico: análise geo-espacial dos factores de invisabilidade". Master's thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/18308.
Pełny tekst źródłaIvanov, Kaloyan. "EFFECTS OF FOREST EDGES, EXOTIC ANTS AND NONNATIVE PLANTS ON LOCAL ANT (HYMENOPTERA: FORMICIDAE) DIVERSITY IN URBAN FOREST FRAGMENTS OF NORTHEASTERN OHIO". Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1295481568.
Pełny tekst źródłaKangas, K. (Katja). "Recreation and tourism induced changes in northern boreal environments". Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514292798.
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