Dissertations / Theses on the topic 'High altitude ecology'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 16 dissertations / theses for your research on the topic 'High altitude ecology.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Sanchez, Maria Elisa. "Carbon flux dynamics in high altitude peatlands in the Ecuadorian Andes." Thesis, Michigan Technological University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10241527.
Full textAlthough knowledge of peatland CH4 and CO2 exchange in temperate mountain ecosystems is available, information about carbon (C) exchange in peatlands of the Andean mountains is limited and these ecosystems may behave differently given the particular characteristics of the Andean tropics. These ecosystems are highly productive and under pressure by grazing. Our first objective was to measure baseline carbon dioxide (CO2) and methane (CH4) flux in an undisturbed peatland in Cayambe-Coca National Park. Our second objective was to quantify CO2 and CH 4 fluxes in an intensively cattle grazed peatland near Antisana Ecological Reserve. CO2 and CH4 effluxes were measured using a static chamber method. The mean NEE values for the undisturbed and disturbed site were -0.69 ± 0.08 and -1.25 ± 0.13 g CO2 m -2 hr-1 respectively. A significant correlation between microtopography and CO2 and CH4 flux was found in the undisturbed site, with higher NEE, GPP, ER and CH4 values in hummocks than in lawns. Microtopography doesn’t seem to be a controller of CO 2 efflux in the grazed site, although the NEE and GPP rates are higher than those found in the undisturbed site, and show a linear relationship with vegetation cover. CH4 emissions in the undisturbed site were low (8.1 ± 1.17 mg CH4 m-2 d -1). However, CH4 emissions at the grazed site were very high (132.25 ± 34.22 mg CH4 m-2 d -1), which might be attributed to the high physical impact and inputs from cattle. In summary, it appears that cattle grazing may be capable of large changes to C exchange and greenhouse gas fluxes in Andean peatlands.
Maphisa, David Hlosi. "Towards adaptive management of high-altitude grasslands: Ingula as a case study." Doctoral thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/16595.
Full textEastern high - altitude grasslands of South Africa are centres for endemism and harbour fauna and flora of regional and international conservation concern. This area also provides important ecological services such as provision of water to communities downstream. Sweet and sour veld support beef livestock farming during summer months. The aesthetic beauty of the region makes the area a prime tourist destination too. More recently the area is becoming a target of other agricultural projects such man - made forests. Other new developments that need to be mitigated against are development of renewable energy projects such as pumped water schemes to generate electricity or wind farms. Additional habitat is lost when these projects are connected to the national grid. In this thesis, I use bird data and vegetation data to compare, contrast and suggest management tools to manage this area. I present data that I collected at Ingula Pumped Storage Scheme spanning five years from the beginning of the construction of the scheme to near its completion in 2012 as a case study to manage similar habitats. Chapter 1 presents a brief overview of ecological importance of this area and the history behind the construction of pumped storage scheme at Ingula. A literature review in Chapter 2 investigates management tools to manage these grasslands for avian diversity. Fire and grazing is a key management tool cited to make habitat suitable for birds. While few studies from this type of grassland exist, studies from outside South Africa suggest that fire and grazing supplement each other as management tool to make habitat suitable for species with contrasting ecological requirements. A mosaic of grass heights and cover across the landscape translates to species habitat suitability. Chapter 3 explores species richness through years, seasons and impact of grass height and cover on bird species richness. Species richness was highest in summer suggesting that management should make habitat for species suitable in summer when most priority species are likely to use the habitat. The main disadvantage of using bird species richness is that fieldworkers must know their species well. Secondly, use of species richness must be treated with caution because this method does not account for species detectability in time and in space. In Chapter 4 I use hierarchical distance sampling models which take into account both the detection and the biological process. To demonstrate this I used common grassland bird species which can easily be identified during monitoring. The downside of this approach is that because these species are common and therefore occur almost everywhere, they may not easily respond to lack of habitat heterogeneity. The technical disadvantage of using this method is to accurately allocate species to within distance bands, making this method challenging for fieldworkers. Chapter 5 presents random plot occupancy which records only detection - nondetection of birds during repeated plot surveys. This method accounts for observational and biological processes too and in addition implements rigorous statistical inferences to predict how birds respond to habitat variable s as influenced by management decision on fire and grazing. Finally, adverse weather conditions may hamper surveying all plots in some years. Through occupancy modelling it is possible to predict species occupancy on plots that were not surveyed during some years and finally this method has been improved to include rare species. This is my preferred method to monitor management effect on habitat suitability for birds at Ingula. Adaptive management, a pillar of which is adaptive monitoring is a new paradigm shift in conservation. In Chapter 6, I capture interactions between burning and grazing and effects on grass height and cover to predict habitat suitability for birds including large threatened Ingula birds using a simulation models. This model sets a stage for implementing adaptive management through experimental plots to capture a set of management uncertainties regarding the use of fire and grazing as management tools. Chapter 7 summarizes the thesis and acknowledges that Ingula consists of other equally important habitat and ecosystem such as cool moist mountain forest and matrix of grassland wetland that equally need to be conserved.
Olvera, Vargas Miguel. "Spatio-temporal dynamics of neotropical high-altitude mixed oak forests in western Mexico." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:0928df01-b4fc-4028-b9a4-f7a393d71489.
Full textMorrison, Fiona Clare. "Altitudinal Variation in the Life History of Anurans in Southeast Queensland." Thesis, Griffith University, 2002. http://hdl.handle.net/10072/366730.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environmental and Applied Science
Science, Environment, Engineering and Technology
Full Text
Figueroa, Rangel Blanca. "Long-term forest dynamics in high-altitude mountains of West-Central Mexico : the human and climate dimension in the Holocene." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:30826402-1eb7-4d94-9a07-4d376c16eea0.
Full textMorrison, Fiona Clare, and n/a. "Altitudinal Variation in the Life History of Anurans in Southeast Queensland." Griffith University. School of Environmental and Applied Science, 2002. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031125.120847.
Full textReckin, Rachel Jean. "Mountains as crossroads : temporal and spatial patterns of high elevation activity in the Greater Yellowstone ecosystem, USA." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/278102.
Full textWigley, Benjamin. "An isotopic assessment of the water sourced by Ischyrolepis Sieberi (Restionaceae) growing at high altitudes in the Cedarberg : does fog play an important role?" Bachelor's thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/26131.
Full textMendonça, Júlia Gaio Furtado de. "Campos de altitude do Parque Estadual da Serra do Papagaio, Minas Gerais, Brasil: composição florística, fitogeografia e estrutura da vegetação." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/5708.
Full textApproved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-09-06T11:32:11Z (GMT) No. of bitstreams: 1 juliagaiofurtadodemendonca.pdf: 4297836 bytes, checksum: 611aa9bbd15f00fc16fe7b8ca2925468 (MD5)
Made available in DSpace on 2017-09-06T11:32:11Z (GMT). No. of bitstreams: 1 juliagaiofurtadodemendonca.pdf: 4297836 bytes, checksum: 611aa9bbd15f00fc16fe7b8ca2925468 (MD5) Previous issue date: 2017-06-19
O Parque Estadual da Serra do Papagaio (PESP), situado na porção Meridional da Serra da Mantiqueira, sul de Minas Gerais, representa uma grande extensão de formações vegetacionais altimontanas com altitudes que alcançam 2.350 m. O objetivo deste trabalho foi conhecer a composição florística dos campos de altitude do PESP, suas relações fitogeográficas com outras áreas campestres das regiões Sul e Sudeste do Brasil e analisar a estrutura da vegetação ao longo de um gradiente altitudinal. Expedições mensais de campo foram realizadas entre maio de 2015 e outubro de 2016 para coleta de material botânico e realização dos inventários fitossociológicos. Para avaliar a estrutura da vegetação foi utilizado o método de interceptação em linha, com alocação de nove áreas abrangendo três faixas altitudinais entre 1.650 m e 2.050 m. Para analisar as relações fitogeográficas foram selecionadas 14 localidades do Sul e Sudeste do país. Foram realizadas análises de similaridade quantitativas e qualitativas além do cálculo da diversidade para cada faixa altitudinal para avaliar a formação de grupos relacionados à altitude. O primeiro capítulo traz a composição florística dos campos de altitude do PESP, onde foram encontradas 276 espécies, 159 gêneros e 48 famílias de angiospermas, sendo Asteraceae a família mais rica (58 spp.) e Baccharis o gênero mais representativo (12 spp.). Foram encontradas onze espécies sob algum grau de ameaça e duas espécies endêmicas do PESP. As análises fitogeográficas mostraram uma grande dissimilaridade florística entre as 14 localidades analisadas, indicando que as formações campestres são singulares e demandam atenção especial para a conservação. O segundo capítulo apresenta a distribuição das espécies ao longo de um gradiente altitudinal. Foram encontradas 96 espécies nas linhas amostradas, sendo Poaceae (64,3%), Melastomataceae (11,3%) e Asteraceae (8,7%) as famílias com maiores valores de cobertura. A diversidade de Shannon (H’) para cada altitude apontou um padrão similar na distribuição espacial das espécies, enquanto as análises de similaridade demonstraram um forte agrupamento das áreas localizadas em faixas altitudinais comuns, elucidando a importância da conservação dos campos de altitude para a manutenção da biodiversidade da flora altomontana.
The Parque Estadual da Serra do Papagaio (PESP) is located in the southern portion of Serra da Mantiqueira, south of Minas Gerais and represents a large expanse of altitudinal vegetation formations with altitudes that reach 2.350 m. The aim of this work was to carry out the floristic survey of the PESP altitude fields (campos de altitude), their phytogeographic relationships with other rural areas of Southern and Southeastern regions of Brazil, and to analyze the vegetation structure along an altitudinal gradient. Monthly expeditions were carried out between May 2015 and October 2016 for the collection of botanical material and the realization of phytosociological inventories. The line intercept method was used to evaluate the vegetation structure. Were inventoried nine areas covering three altitudinal ranges between 1.650 m and 2.050 m. In order to analyze the phytogeographic relations, were selected 14 localities of Brazil South and Southeast. Quantitative and qualitative similarities analyzes were carried out. In addition, the diversity index (H') were calculated for each altitudinal range in order to evaluate the formation of groups related to altitude. The first chapter presents the floristic composition of the PESP altitude fields, where 276 species, 159 genera and 48 families of angiosperms were found, with Asteraceae being the richest family (58 spp.) and Baccharis the most representative genus (12 spp.). Eleven species are in some threatness category and two species were considered endemic to the PESP. The phytogeographic analyzes showed a great floristic dissimilarity between the 14 localities analyzed, indicating that the formations are unique and require special attention for conservation. The second chapter presents the distribution of the species along an altitudinal gradient. 96 species were found in the sampled lines, with Poaceae (64.3%), Melastomataceae (11.3%) and Asteraceae (8.7%) being the families with the highest coverage values. The diversity of Shannon (H') for each altitude showed a similar pattern in the spatial distribution of species, while the similarity analyzes demonstrated a strong grouping of the areas located in common altitudinal bands, elucidating the importance of the conservation of altitude fields for the maintenance of the biodiversity of the high altitude flora.
Brau-Nogué, Catherine. "Dynamique des pelouses d'alpages laitiers des Alpes du Nord externes." Université Joseph Fourier (Grenoble ; 1971-2015), 1996. http://www.theses.fr/1996GRE10004.
Full textCarbutt, Clinton. "Cape elements on high-altitude corridors and edaphic islands." Thesis, 2004. http://hdl.handle.net/10413/10119.
Full textThesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2004.
Steffens, Erik. "Red pandas and conservation political ecology, tenure, livestock, and hunting in high altitude forests of Nepal /." 2004. http://catalog.hathitrust.org/api/volumes/oclc/58471397.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 131-139).
Castillo, Oscar Alberto Rojas. "Biological invasion in Rio Grande do Sul, Brazil: monitoring ceratium furcoides (levander) langhans, its drivers, and ecological interactions in a high-altitude subtropical reservoir." Master's thesis, 2019. http://hdl.handle.net/10316/87845.
Full textCeratium furcoides (Levander) Langhans é uma espécie invasora de fitoplâncton para as águas doces brasileiras, associada a impactos ecológicos que afetam a qualidade da água e a comunidade aquática local. Este estudo explorou as interações entre espécies fitoplanctónicas durante a invasão de C. furcoides e os vetores (variáveis meteorológicas, físicas e químicas), contribuindo para sua dominância e florescimento numa barragem subtropical de altitude (Marrecas, Sul do Brasil). O programa de monitorização foi implementado semanalmente a mensal desde 2014 (n = 116), dependendo da densidade das cianobactérias. Testes descritivos, de hipóteses, correlações e estatística multivariada (PCA e CCA) foram utilizados para compreender os padrões de distribuição temporal (sazonal e interanual) da comunidade fitoplanctónica e as variáveis ambientais. Durante o estudo, C. furcoides (Miozoa) evitou os verões e preferiu as primaveras, exibindo em outubro de 2014 a maior densidade reportada (15.865 ind.mL-1). Apresentou uma correlação com a presença de ferro, manganês e turbidez, evidenciando a sua dependência do período de mistura que re-suspende os seus cistos do fundo, ativando-os com a luz e as altas temperaturas do “epilimnion” (camada superior da coluna de água num lago estratificado) (temperatura ótima para a espécie durante a primavera). Chroomonas, Cryptomonas (Cryptophyta), Discostella (Bacillariophyta), e depois de 2016 também Chlamydomonas (Chlorophyta) foram os únicos taxa presentes durante os picos de C. furcoides. Chroomonas, Cryptomonas e Aulacoseira (Bacillariophyta), que habitam águas turbulentas, correlacionaram-se positivamente com o invasor, enquanto as Chlorophyta (Sphaerocystis, Schroederia e Monoraphidium) e as Bacillariophyta (Urosolenia, Rhizosolenia e Discostella) preferiram o verão e o outono, Cyanobacteria (Pseudanabaena). que preferiram o inverno e o outono, Ochrophyta (Mallomonas) que evitavam a primavera e Chlamydomonas sem sazonalidade, todos apresentaram correlações negativas com o invasor. Os picos de C. furcoides foram associados a maiores níveis de oxigénio dissolvido e menor riqueza de espécies. Ao longo do tempo, C. furcoides e o resto dos picos de densidade do fitoplâncton diminuíram consideravelmente mostrando, embora não conclusivamente, evidências de coexistência estável.
Ceratium furcoides (Levander) Langhans is a phytoplankton species invasive in Brazilian freshwaters, associated with ecological impacts affecting the water quality and local aquatic community. This study explored the interactions between phytoplankton species during the invasion of C. furcoides and the drivers (meteorological, physical, and chemical variables) contributing to its dominance and blooms in a subtropical high-altitude reservoir (Marrecas, Southern Brazil). The monitoring program was implemented weekly to monthly since 2014 (n=116), depending on the cyanobacteria density. Descriptive, hypothesis tests, correlations, and multivariate statistics (PCA and CCA) were employed to understand the temporal (seasonal and interannual) distribution patterns of the phytoplankton community and the environmental variables. During the study, C. furcoides (Miozoa) avoided summers and preferred springs (southern hemisphere), displaying in October of 2014 the highest density ever reported (15,865 ind.mL-1). It showed correlation with iron, manganese, and turbidity evidencing its dependency on the mixing period which resuspends its cysts from the bottom, activating them with the light and high temperatures of the epilimnion/surface (optimal temperature for the species during spring). Chroomonas, Cryptomonas (Cryptophyta), Discostella (Bacillariophyta), and after 2016 also Chlamydomonas (Chlorophyta) were the only taxa present during C. furcoides peaks. Chroomonas, Cryptomonas, and Aulacoseira (Bacillariophyta), which inhabit turbulent waters, correlated positively with the invader while, Chlorophyta (Sphaerocystis, Schroederia, and Monoraphidium) and Bacillariophyta (Urosolenia, Rhizosolenia, and Discostella) that preferred summer and fall, Cyanobacteria (Pseudanabaena) that preferred winter and fall, Ochrophyta (Mallomonas) that avoided spring, and Chlamydomonas with no seasonality, all showed negative correlations with the invader. C. furcoides peaks were associated with higher dissolved oxygen levels and lower species richness. Throughout time, C. furcoides and the rest of the phytoplankton density peaks decreased considerably showing, although not conclusively, evidence of stable coexistence.
Outro - Erasmus Mundus grant, International Master in Applied Ecology program
DVORSKÝ, Miroslav. "Ecology of alpine plants in NW Himalaya." Doctoral thesis, 2014. http://www.nusl.cz/ntk/nusl-172974.
Full textGrow, Nanda Bess. "Altitudinal Effects on The Behavior and Morphology of Pygmy Tarsiers (Tarsius pumilus) in Central Sulawesi, Indonesia." Thesis, 2013. http://hdl.handle.net/1969.1/151337.
Full textNevin, Berger Rebecca. "Examining Aesthetic Subjectivity in Embodied Environments." Phd thesis, 2019. http://hdl.handle.net/1885/164231.
Full text