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Dissertations / Theses on the topic 'Tree Population dynamic'

Author: Grafiati

Published: 10 March 2023

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1

Villari, Caterina. "Fungi associated with the pine engraver beetle Ips acuminatus and their interactions with the host tree." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422532.

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Conifer bark beetles are typically associated with complexes of fungi with which they can display different functional relationships. Some of the fungi, generally non phytopathogenic, are known to have a directly mutualistic interaction with the beetles, serving as nourishment to the larvae. Other associated fungi are thought to be involved in the process of exhausting plant defenses, which is a necessary step for the insects to overcome host tree resistance and colonize the plant. In the latter case, bark beetle-associated fungi are often tree pathogenic species belonging to the morphological

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2

Manokaran, N. "Population dynamics of tropical forest trees." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 1988. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59678.

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3

Stan, Amanda B., Thomas B. Maertens, Lori D. Daniels, and Stefan Zeglen. "Reconstructing Population Dynamics Of Yellow-Cedar In Declining Stands: Baseline Information From Tree Rings." Tree-Ring Society, 2011. http://hdl.handle.net/10150/622635.

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Yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) forests of coastal British Columbia are apparently experiencing decline in a manner similar to that observed in southeastern Alaska. In this pilot study, we collect tree-ring data from live and standing dead yellow-cedar trees from four declining sites on the North Coast of British Columbia. We use this data to compare growth patterns at our sites to those of yellow-cedar trees at non-declining and declining sites in southwestern British Columbia and southeastern Alaska and, in addition, to assess the possibility of reconstructing yello

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4

Lind, Brandon M. "NATURAL AND ANTHROPOGENIC DRIVERS OF TREE EVOLUTIONARY DYNAMICS." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5359.

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Species of trees inhabit diverse and heterogeneous environments, and often play important ecological roles in such communities. As a result of their vast ecological breadth, trees have become adapted to various environmental pressures. In this dissertation I examine various environmental factors that drive evolutionary dynamics in threePinusspecies in California and Nevada, USA. In chapter two, I assess the role of management influence of thinning, fire, and their interaction on fine-scale gene flow within fire-suppressed populations of Pinus lambertiana, a historically dominant and ecological

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5

Kolodin, Dmitriy Pavlovich. "Dynamics of Tissue-Resident Regulatory T Cell Populations." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11555.

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In recent years, there has been a worldwide increase in obesity, which parallels a rise in pathologies, including type 2 diabetes, collectively termed the metabolic syndrome. Chronic, low-grade inflammation has been implicated as a major link between these diseases. Recent work showed the presence of a unique subset of CD4+Foxp3+ regulatory T cells residing in visceral adipose tissue (VAT Treg) with PPAR-g being the key transcription factor responsible for their phenotype and function in controlling adipose tissue inflammation and, thereby, insulin sensitivity. VAT Tregs inversely correlated w

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6

Alalouni, Urwa [Verfasser], and Roland [Akademischer Betreuer] Brandl. "Insects in forests. Assemblages, effects of tree diversity and population dynamics / Urwa Alalouni. Betreuer: Roland Brandl." Marburg : Philipps-Universität Marburg, 2014. http://d-nb.info/1059856425/34.

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7

Boom, Arthur. "Diversification, evolution and population dynamics of the genus Brachystegia, a keystone tree of African miombo woodlands." Doctoral thesis, Universite Libre de Bruxelles, 2021. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/331717.

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Miombo woodlands are vast wooded savannas covering 2 million km2 in East and Southern Africa. The main feature of these landscapes with closed but not overly dense canopy is the dominance of Brachystegia, Isoberlina, and Julbernardia legume trees genera. The timing of the onset of such vegetation, mainly understood through pollen fossils remains unclear. Dated molecular phylogeny calibrated with fossils for the aforementioned genera has the potential to provide details regarding the origin of species that nowadays dominate the current woodlands and possibly of miombo vegetation as a whole. The

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8

Houlgreave, John A. "Water tree dynamics and their scaling with field and frequency by analysis of time-series population data." Thesis, University of Leicester, 1996. http://hdl.handle.net/2381/34781.

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Water trees are a major form of degradation in solid organic electrical insulation subject to high AC voltages and water. The work is aimed at developing a more rigorous approach to analysing water tree data from ageing experiments on practical insulation geometries. Such data is in the form of tree length distributions and time-increasing tree number densities. Tree inception statistics are directly accessible from the data, but the effects of growth are convolved with those of inception. An approach is developed for analysing the data to quantify aspects of both inception and growth. In part

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9

Giesecke, Thomas. "The Holocene Spread of Spruce in Scandinavia." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4623.

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<p>The Holocene spread of <i>Picea abies</i> in Scandinavia provides an excellent opportunity for detailed study of the dynamics of tree spread and population expansion. Early- and mid-Holocene macrofossil evidence for the presence of <i>Picea abies</i> in Scandinavia has questioned traditional interpretations of the timing and direction of its spread. This study aims to determine the pattern of the spread of <i>Picea abies</i> in Scandinavia from pollen and other data, to evaluate the significance of possible early outpost populations and to deduce possible factors that influenced the spread

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10

Valeriano, Diana Damasceno Barreto. "Dinâmica da floresta ombrófila mista altomontana, Campos do Jordão, São Paulo." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-25082010-114434/.

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Avaliou-se a dinâmica do componente arbóreo de uma área de Floresta Ombrófila Mista na região sudeste do Brasil, com o objetivo de verificar seu estádio sucessional e sua aderência aos modelos dinâmicos propostos para esta formação. O primeiro, modelo lozenge, ou de substituição temporal de área, propõe que a dinâmica é influenciada por padrão de recrutamento intermitente dependente de distúrbios severos, para as pioneiras longevas, geralmente gimnospermas, que dominam estruturalmente a floresta. O segundo propõe que a presença da Araucaria angustifolia é indicativa de sucessão em curso, pois

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11

Bizotto, Lucas de Almeida. "Avaliação populacional, sanitária e recursos armazenados em colmeias de Apis mellifera Linnaeus, 1758 (Hymenoptera: Apidae) utilizadas em serviços de polinização em pomares de macieiras (Malus domestica Borkh.)." Universidade do Estado de Santa Catarina, 2016. http://tede.udesc.br/handle/handle/2385.

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Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2018-02-26T14:27:28Z No. of bitstreams: 1 PGPV16MA198.pdf: 1078885 bytes, checksum: d8fc297fd799d14486911861079a1a6c (MD5)<br>Made available in DSpace on 2018-02-26T14:27:28Z (GMT). No. of bitstreams: 1 PGPV16MA198.pdf: 1078885 bytes, checksum: d8fc297fd799d14486911861079a1a6c (MD5) Previous issue date: 2016-07-29<br>Capes<br>This study aimed to evaluate the behavior and health of hives of honeybees (Apis mellifera) used in pollination services in apple orchards in the municipality of Vacaria, RS. Conducted under the conventional pro

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12

Portela, Rita de Cassia Quitete. "Ecologia populacional de tres especies de palmeiras em uma paisagem fragmentada no dominio da Mata Atlantica, RJ." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316359.

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Orientador: Flavio Antonio Maes dos Santos<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia<br>Made available in DSpace on 2018-08-11T08:23:40Z (GMT). No. of bitstreams: 1 Portela_RitadeCassiaQuitete_D.pdf: 6621618 bytes, checksum: 9d154b095412a40c5fe90a3fb97f0ef0 (MD5) Previous issue date: 2008<br>Resumo: O objetivo dessa tese foi comparar a densidade, estrutura e dinâmica de populações de três espécies de palmeiras (Astrocaryum aculeatissimum (Schott) Burret, Euterpe edulis Mart. e Geonoma schottiana Mart.) em uma paisagem fragmentada de Mata Atlântica. As pop

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13

Doublet, Violette. "Interactions biotiques et dynamiques des populations : approches empiriques et théoriques de la prédation pré-dispersion des graines par les insectes." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG007.

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Les interactions biotiques figurent parmi les processus clés de la dynamique des populations et constituent un enjeu fort pour le renouvellement et la persistance des espèces au sein des écosystèmes. En particulier, l’herbivorie par les insectes prédateurs des graines avant dispersion est un processus écologique majeur de la dynamique forestière par son impact sur le succès reproducteur des arbres et leur régénération naturelle. Cependant, les conséquences de cette herbivorie sur la dynamique et l’évolution des populations d’arbres demeurent des fronts de science, qui ont été abordés dans cett

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14

Sirakov, Nikolay. "Modélisation de la dynamique de population d une plante native (palmier babaçu) dans le cadre d'un projet de gestion durable au Brésil." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT302/document.

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Le palmier babaçu (Attalea speciosa Mart. ex Spreng.) est une plante native de la forêt amazonienne. La déforestation a pour impact qu'il apparaît dans des milieux ouverts désormais anthropisés (pâturages, et champs cultivés). Le babaçu fait partie des ressources " extractivistes " du Brésil : activité de cueillette suivie de commercialisation de produits non ligneux. Cette activité concerne des personnes parmi les plus démunies du pays d'où l'importance de gérer au mieux sa durabilité dans un contexte conflictuel. Force est de constater que les connaissances du fonctionnement durable de l'esp

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15

Desplanque, Carole. "Dendroécologie comparée du sapin et de l'épicéa dans les Alpes internes et franco-italiennes : rôle des facteurs climatiques et anthropique sur leur répartition." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10011.

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Dans la gestion forestiere des espaces montagnards abandonnes des alpes internes francaises et italiennes, il importe de determiner les potentialites du sapin (abies alba mill. ) et de l'epicea (picea abies (l. ) karsten), compte tenu de leur comportement vis-a-vis du climat et de l'action anthropique passee. ? une etude dendroecologique a d'abord ete realisee sur 33 populations echantillonnees dans 4 vallees : la tarentaise, la maurienne, le brianconnais et le val de suse. Des fonctions de correlation ont ete calculees entre les chronologies d'indices de croissance radiale de chaque populatio

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16

Arquilliere, Sylvie. "Morphologie, croissance, reproduction végétative de l'épicéa (Picea abies(L. )Karsten. ) dans une zone de combat subalpine : massif du Taillefer, Alpes dauphinoises." Grenoble 1, 1986. http://www.theses.fr/1986GRE10080.

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On examine les caracteristiques ecologiques essentielles de la zone de combat de l'epicea, a sa limite superieure subalpine afin de mieux connaitre la dynamique du peuplement etudie. Etude des interactions etroites entre parametres microstationnels, facteurs climatiques et comportement des arbres (morphologie, croissance, reproduction vegetative). Une analyse dendroclimatologique, realisee a posteriori, permet de completer et de confirmer les precedents resultats

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17

SALBITANO, FABIO. "Meccanismi di occupazione dello spazio da parte di semenzali e polloni dopo la ceduazione nella macchia mediterranea." Doctoral thesis, 1992. http://hdl.handle.net/2158/606202.

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18

Kneeshaw, Daniel D. "Tree population dynamics of some old sub-boreal spruce stands." Thesis, 1992. http://hdl.handle.net/2429/2992.

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Disturbance at the scale of single trees shapes the development of boreal forest ecosystems, especially in 'overmature' or 'old-growth' stages, despite the acknowledged role of fire as a catastrophic agent of stand reinitiation. This study has reconstructed the population dynamics of fourteen Sub-Boreal Spruce stands (composed of Picea engelmanni x glauca, Abies lasiocarpa and lesser amounts of Pinus contorta and Populus tremuloides) since the last stand destroying wildfire. Identification of the post-disturbance cohort and subsequent recruitment provided a means of assessing the relativ

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19

Li, Pei-Hua, and 李佩樺. "Tree Growth and Population Dynamics of Abies kawakamii in Mt. Xue, North Taiwan." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5360006%22.&searchmode=basic.

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碩士<br>國立中興大學<br>森林學系所<br>107<br>Abies kawakamii (Kawakami fir) is a critical ecological indicator in subalpine ecosystems and is composed mostly of pure forest distributed 3100–3600 m above sea level, most typically on Mt. Xue of North Taiwan. Thus, the estimation of growth and stock may be worth including in discussions on the regeneration, biomass, and carbon storage of Kawakami fir forest. The content is separated into two parts: one is small scale for the single-tree level, and the other is large scale for the stand-stock level. By reconstructing and verifying the volume equation of Abies

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20

Kellner, James Robert. "Population and community dynamics of tropical rain forest canopy trees." 2008. http://purl.galileo.usg.edu/uga%5Fetd/kellner%5Fjames%5Fr%5F200805%5Fphd.

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21

Stretch, Anne-Marie. "A modelling approach to elephant and tree population dynamics for a small game farm." Thesis, 2005. http://hdl.handle.net/10321/110.

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Thesis (M.Tech.: Information Technology)-Durban Institute of Technology, 2005 iii, iii, 85 leaves<br>Throughout Africa, growing human populations and resulting loss of wildlife habitat is a critical issue for most animal species. It is more and more common for privately owned small or medium sized farms to reintroduce wildlife on their land and such protected areas are fast becoming the only refuges available to wild animals. However a comprehensive understanding of the complex ecological processes taking place is vital for the effective management of restricted areas and the conservation

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22

Xu, Ru Jun, and 許如君. "Population dynamics, spatial distribution, and sampling procedures of aulacaspis yabunikkei kuwana on camphor trees." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/21677187731623921675.

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23

Ribbons, Relena R. "Evaluating the Influence of Disturbance and Climate on Red Spruce (Picea rubens Sarg.) Community Dynamics at its Southern Range Margin." 2011. https://scholarworks.umass.edu/theses/710.

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Picea rubens(red spruce) populations experienced a synchronous rangewide decline in growth and vigor starting in the 1960’s, which was likely caused by climate change or environmental disturbances (e.g., acid deposition); However, it is yet unknown if populations continue to decline or have recovered. In the context of global warming, red spruce is a species of concern because it is at its southern continuous range margin in Massachusetts. This study uses tree-ring data coupled with population data from permanent plots to quantify the status of red spruce in Massachusetts. Tree cores were extr

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24

Palisetty, Raghunadh. "Effects of sheep, kangaroos and rabbits on the regeneration of trees and shrubs in the chenopod shrublands, South Australia." 2007. http://arrow.unisa.edu.au:8081/1959.8/28390.

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After European settlement, Australian rangelands especially in South Australia underwent significant changes because of the main land use of pastoralism. Many studies have revealed that the plant communities are negatively effected by herbivory mainly by sheep. The main aim of this study is to separate the different effects of sheep, rabbits and kangaroos. This was examined by survey supported by experimental and modelling research. A 32,000 km² area previously surveyed by Tiver and Andrew (1997) in eastern South Australia was re-surveyed to monitor populations of perennial plant species at si

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25

Höhn, Patrick. "Funktionelle Vielfalt von Hymenopteren entlang eines Gradienten agroforstlicher Nutzung in Indonesien." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-000D-F136-9.

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