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Dissertations / Theses on the topic 'Ecosystème tropical'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Huguet, Lucie. "Caractérisation biogéochimique et potentiel de méthylation du mercure de biofilms en milieu tropical (retenue de Petit Saut et estuaire du Sinnamary, Guyane Française)." Thesis, Nancy 1, 2009. http://www.theses.fr/2009NAN10080/document.

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Le barrage de Petit Saut a été construit sur le fleuve Sinnamary en Guyane française en 1994. De la forêt tropicale laissée en place lors de la mise en eau, subsistent encore aujourd'hui de nombreux troncs d'arbres dans toute la retenue. Des biofilms ont colonisés la surface de ces troncs et sont également retrouvés en abondance sur plusieurs dizaines de km à l'aval du barrage. L'objectif de la thèse a été de caractériser ces biofilms et de déterminer leur rôle dans la méthylation du mercure. Dans un premier temps, les biofilms ont été caractérisés par une approche multidisciplinaire. La compo

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2

Ruiz, Jaen Maria. "The Relationship between Biodiversity and Ecosystem Function in Tropical Ecosystems." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104676.

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Experimental studies, in temperate grasslands, assessing the role of biodiversity and its effects on ecosystem functioning have generally shown that a decline in species number has negative effects on ecosystem functioning. Even though, this relationship has been intensively studied in the last ten years, little is known about it in complex and hyperdiverse tropical ecosystems and where species diversity is not manipulated. My research examines the relationship between biodiversity and ecosystem functioning in natural tropical forests with a special focus on scale. This research centers on fi

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3

Cotter, Hannah B. "Simulation Modeling of a Tropical Cave Ecosystem." Scholarship @ Claremont, 2015. http://scholarship.claremont.edu/scripps_theses/561.

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The Tamana Cave system in Trinidad is relatively unaffected by the environment outside of the cave walls, like most cave ecosystems. Since a very limited amount of light can enter the cave, bat movement controls the temperature cycle rather than the solar radiation that controls it in the surrounding forest. Similarly, the ecosystem cannot be sustained by energy from photosynthesis and so the main source of energy comes from the guano produced by the insectivorous bat species, N. tumidirostris. The frugivorous bat species, P. hastatus, also roosts inside of the cave, but the wetness of the top

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4

Eklöf, Johan S. "Anthropogenic Disturbances and Shifts in Tropical Seagrass Ecosystems." Doctoral thesis, Stockholm University, Department of Systems Ecology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7285.

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<p>Seagrasses constitute the basis for diverse and productive ecosystems worldwide. In East Africa, they provide important ecosystem services (e.g. fisheries) but are potentially threatened by increasing resource use and lack of enforced management regulations. The major aim of this PhD thesis was to investigate effects of anthropogenic distur-bances, primarily seaweed farming and coastal fishery, in East African seagrass beds. Seaweed farming, often depicted as a sustainable form of aquaculture, had short- and long-term effects on seagrass growth and abundance that cascaded up through the foo

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5

Eklöf, Johan S. "Anthropogenic disturbances and shifts in tropical seagrass ecosystems /." Stockholm : Department of Systems Ecology, Stockholm University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7285.

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6

Williams, Joseph James. "Human and climate impacts on tropical Andean ecosystems." Thesis, Open University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542449.

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Population growth and predicted global climate change are applying new, and increasing, pressure to mountain environments, but the consequences of these changes upon the biodiverse and vulnerable Tropical Andean ecosystems are poorly understood. This thesis explores past human-climate-ecosystem interactions using multi-proxy palaeolimnological investigations (fossil pollen, spore, charcoal and Chironomidae (midges); elemental abundance, colour spectra and magnetic susceptibility) of two sites in the eastern Bolivian Andes (Lake Challacaba and Laguna Khomer Kocha Upper) over the last c. 18,000

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7

Donovan, Sarah Elizabeth. "Soil-feeding in termites set within a phylogenetic framework." Thesis, Queen Mary, University of London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322576.

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8

Suchanová, Veronika. "Tropické deštné pralesy v moderní civilizaci." Master's thesis, Vysoká škola ekonomická v Praze, 2009. http://www.nusl.cz/ntk/nusl-12460.

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This thesis deals with the selected issues regarding tropical rainforests in modern civilization. It explains what the tropical rainforest is and where it is located. The thesis points at the importance of the tropical rain forestry, and warns of increasing threats primarily due to deforestation. The thesis also shows possible approaches to deal with the issue and presents a practical example of a functional project in real life.

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9

Rosolem, Rafael. "Land Surface Processes In Natural and Artificial Tropical Ecosystems." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194510.

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Land Surface Parameterization (LSP) schemes have evolved from simple tipping-bucket models to fully interactive models, including parameterizations which account for exchanges of momentum, energy, mass, and biogeochemistry. As the demand for greater realism has increased, so has the complexity of LSPs which now includes some parameters that may not be universally relevant to all regions of the globe. The performance of LSP schemes depends on the magnitude of structural, data-related (input and output), and parameter uncertainties in the model. Parameter estimation uncertainty can be reduced by

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10

Hehre, Edward James III. "Effects of seaweed farming on tropical shallow coral ecosystems." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59344.

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Seascapes are being transformed by human activities through a variety of spatially extensive extractive uses. This industrialization has the potential to radically alter the ecology of our oceans. Through focused ecosystem-based management of already degraded systems, it may be possible to create novel ecosystems that maximize beneﬁts for humans, while increasing the diversity and abundance of dependent communities. In this thesis I examine seaweed farming on degraded coral reef ecosystems in order to examine 1) the relationship between seaweed farms and rabbitfish production globally, 2) the

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11

Lacambra-Segura, Carmen Liliana. "Ecosystem-inclusive coastal vulnerability assessment in tropical Latin America." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608842.

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12

Senior, Michael J. M. "Assessing biodiversity and ecosystem functioning in fragmented tropical landscapes." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/6258/.

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Agricultural expansion and logging are resulting in habitat degradation and fragmentation, especially in tropical regions. In Southeast Asia oil palm agriculture and commercial logging are the main threats to rainforest biodiversity, and I assessed the impacts of forest disturbance and land-use change on species composition and ecosystem functioning. I explored the role of the High Conservation Value (HCV) approach for biodiversity conservation in tropical agricultural landscapes and concluded that better knowledge exchange between scientists and HCV users is needed to improve biodiversity con

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13

Steward, Peter Richard. "Ecosystem services and disservices in small-scale tropical agriculture." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7773/.

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Small-scale farmlands are dynamic systems crucial to the food-security and livelihoods of more than two billion people and there is political pressure in many developing nations to consolidate and expand small farms into larger units of management. This could have consequences for agro-ecosystem processes and the ecosystem services and disservices that regulate crop production. This thesis aims to highlight and address these issues in smallholder farming landscapes, which are poorly studied and represent significant knowledge gaps. Research on pollination and biological control is biased towar

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14

Glenski, Andrew J. "Tropical ecolodge design manual." Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/4029.

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15

Mustow, Stephen Eric. "Aquatic macroinvertebrates and environmental quality in rivers in Northern Thailand." Thesis, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266399.

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16

Forselius, Ellen. "The Good, The Bad and The Seascape : Possible Effects of Climate Change in Tropical People and Ecosystems in the Western Indian Ocean Using a Gender Perspective." Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-96064.

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The tropical seascape is herein defined as a landscape made up of five ecosystems: coastal terrestrial forests, mangrove forests, seagrass beds, coral reefs and the deep sea. Previous studies have shown that men and women use the tropical seascape in different ways. If the seascape was to change as a result of anthropogenic climate change, then men and women could potentially be affected differently by those changes. The seascape is particularly vulnerable to the predicted rise in sea-level and ocean warming, but the coastal terrestrial forests and mangrove forests are in addition vulnerable t

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17

Blei, Emanuel. "Study of methyl halide fluxes in temperate and tropical ecosystems." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4717.

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CH3Br and CH3Cl (methyl halides) are the most abundant natural vectors of bromine and chlorine into the stratosphere and play an important role in stratospheric ozone destruction. The current knowledge of their respective natural sources is incomplete leading to large uncertainties in their global budgets. Beside the issue of quantification, characterisation of possible sources is needed to assist modelling of future environmental change impacts on these sources and hence the stratosphere. This study describes measurements conducted at two temperate salt marsh and three temperate forest sites

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18

Ascarrunz, Nataly Lorena. "Topography, elemental ratios, and nutrient limitation in tropical montane ecosystems." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337070.

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19

Hopple, Anya. "Understanding Anaerobic Carbon Cycling in Tropical and Boreal Wetland Ecosystems." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23747.

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Understanding methane (CH4) cycling dynamics is of paramount importance because CH4 has 45 times the sustained-flux global warming potential of carbon dioxide (CO2) and is currently the second most important anthropogenic greenhouse gas. Wetland ecosystems emit one-third of total global CH4 emissions, making them the single largest natural CH4 source and placing them among the most important terrestrial ecosystems in the global carbon (C) cycle. Wetlands in tropical and boreal regions are drivers of recent inter-annual variation in atmospheric CH4 concentrations because they play vital roles i

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20

Kavanagh, Lydia Jane. "An engineered ecosystem for environmentally sustainable wastewater treatment for remote tourist resorts in tropical/sub-tropical regions /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16958.pdf.

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21

Hutchinson, David John. "Institutional fit in tropical ecosystems : a test using marine protected areas." Thesis, University of East Anglia, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405692.

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22

Slade, Eleanor M. "The effects of tropical forest management on biodiversity and ecosystem functioning." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:d4689410-3c13-4e92-9f35-e4abe0d8e0ac.

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The Effects of Tropical Forest Management on Biodiversity and Ecosystem Functioning Eleanor M. Slade 1. Between 35 % and 50 % of all closed-canopy tropical forest has been lost, and the rate of deforestation continues to increase throughout the tropics. Despite a wealth of literature on the effects of tropical forest disturbance on the diversity and composition of a variety of taxa, there is still no clear consensus on the value of disturbed forests for biodiversity. 2. If forest management practises are to be sustainable in the long-term they should maintain both biodiversity and ecosystem fu

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23

Shibata, Makoto. "Soil Ecosystem Processes in Tropical Forests, Savanna, and Croplands of Cameroon." Kyoto University, 2018. http://hdl.handle.net/2433/232365.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第21164号<br>農博第2290号<br>新制||農||1060(附属図書館)<br>学位論文||H30||N5138(農学部図書室)<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授舟川晋也, 教授縄田栄治, 教授北山兼弘<br>学位規則第4条第1項該当

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24

Wu, Jin. "How do Amazonian Tropical Forest Systems Photosynthesize under Seasonal Climatic Variability: Insights from Tropical Phenology." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/594653.

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Amazonian evergreen forests are of broad interest, attributable to their ecological, economic, aesthetic, and cultural importance. However, their fate under climate change remains uncertain, largely due to unclear mechanisms in regulating tropical photosynthetic metabolism. Understanding mechanistic controls on these dynamics across time scales (e.g. hours to years) is essential and a prerequisite for realistically predicting tropical forest responses to inter-annual and longer-term climate variation and change. Tropical forest photosynthesis can be conceptualized as being driven by two intera

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25

Gereta, Emmanuel Joshua. "The importance of Water Quality and Quantity in the Tropical Ecosystems, Tanzania." Doctoral thesis, Norwegian University of Science and Technology, Norwegian University of Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1823.

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<p>This thesis looks at the importance of water quality and quantity in the tropical ecosystems in relation to movement of animals who depend on that water for their daily lives and existence. Seasonal fluctuations of rainfall were pronounced, with marked wet and dry seasons. Surveys of water quality in the surface waters in the Serengeti and Tarangire National Parks in Tanzania, East Africa were undertaken throughout the year, in both the wet and dry seasons, from 1996 to 2003. Surveys of water quality in the surface waters of Tarangire National Park were carried out from 1999 to 2001. In the

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26

Herrick, Jeffery Ewing. "Restoration of tropical pasture ecosystems and the role of cattle dung patches /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487847761309791.

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27

Lilliesköld, Sjöö Gustaf. "Macroalgae in tropical seascapes : regulating factors and functions in the coastal ecosystem." Doctoral thesis, Stockholms universitet, Systemekologiska institutionen, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-45951.

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Although macroalgae usually are inconspicuous on pristine coral reefs, they often thrive on reefs that are subjected to various types of anthropogenic disturbance. This thesis consists of five papers and investigates how biomass and composition of macroalgal communities on coral reefs are affected by regulating factors, such as nutrient availability, herbivory, substrate availability and hydrodynamic forces. In addition, ecological functions and potential impacts of both wild and farmed macroalgal communities are evaluated. Paper I describes a method for using macroalgal tissue nutrient concen

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28

Shanahan, Timothy M., Konrad A. Hughen, Nicholas P. McKay, et al. "CO2 and fire influence tropical ecosystem stability in response to climate change." NATURE PUBLISHING GROUP, 2016. http://hdl.handle.net/10150/618982.

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Interactions between climate, fire and CO2 are believed to play a crucial role in controlling the distributions of tropical woodlands and savannas, but our understanding of these processes is limited by the paucity of data from undisturbed tropical ecosystems. Here we use a 28,000-year integrated record of vegetation, climate and fire from West Africa to examine the role of these interactions on tropical ecosystem stability. We find that increased aridity between 28-15 kyr B.P. led to the widespread expansion of tropical grasslands, but that frequent fires and low CO2 played a crucial role in

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29

Griffiths, Hannah. "Invertebrate mediated biodiversity-ecosystem functioning relationships : lessons from tropical forest dung beetles." Thesis, Lancaster University, 2015. http://eprints.lancs.ac.uk/76227/.

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Biological communities are changing across the globe as a result of anthropogenic pressures; abundances of individuals are declining within populations and species are becoming extinct. Biological diversity and trophic complexity in grasslands and soil food webs are positively associated with the cycling of nutrients in soil and water, primary productivity and decomposition. Since these ecosystem processes underpin a number of goods and services to society, human-driven changes in the structure of ecosystems could negatively impact upon human wellbeing. However, the majority of our knowledge o

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30

Rodrigues, Alice Cristina. "Topography drive species diversity, structure and ecosystem function in tropical Atlantic forest." Universidade Federal de Viçosa, 2018. http://www.locus.ufv.br/handle/123456789/21184.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2018-08-15T11:23:48Z No. of bitstreams: 1 texto completo.pdf: 1809750 bytes, checksum: f98aa6a0a99a9fc4f4d17b666b2a060c (MD5)<br>Made available in DSpace on 2018-08-15T11:23:48Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1809750 bytes, checksum: f98aa6a0a99a9fc4f4d17b666b2a060c (MD5) Previous issue date: 2018-02-20<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>A Mata Atlântica é considerada um dos centros de diversidade de plantas vasculares mais importantes do mundo, desempenhando diversos serviços

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Given, EmmaLeigh Kaleb. "Understanding community assembly processes and ecosystem function in tropical and temperate streams." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1595852577551628.

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32

Hedman, Astrid. "Effects of land use on wetland carbon storage and ecosystem services in the tropics : A first estimation investing rural wetlands in central and eastern Uganda." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-155860.

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Wetlands provide important ecosystem services (ES) by storing large amounts of organic carbon (OC) and being of high biological, cultural, and economical value. Uganda is covered by vast wetland areas but has with a booming population rapidly been decreasing due to pressure on lands. The aim of this report was to examine important socio-ecological dynamics of rural wetlands in relation to variations of land use in central and eastern Uganda. This by assessing above- (ABG) and belowground (BG) C stocks, soil pH, and capturing provisioning ES and related impacts on soil and vegetation. The metho

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33

Yokoyama, Daiki. "Significance of soil organic phosphorus for the maintenance of tropical rain forest ecosystems." Kyoto University, 2019. http://hdl.handle.net/2433/236631.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第21470号<br>農博第2313号<br>新制||農||1064(附属図書館)<br>学位論文||H31||N5165(農学部図書室)<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授北山兼弘, 教授本田与一, 教授舟川晋也<br>学位規則第4条第1項該当

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Wade, Amy S. I. "Trade-offs in managing tropical land for biodiversity, ecosystem services and agricultural productivity." Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541949.

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35

Moore, Sam. "Effects of ecosystem disturbance on fluvial carbon losses from tropical peat swamp forests." Thesis, Open University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542448.

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Investigations into the effects of anthropogenic disturbance on greenhouse gas emissions from tropical peatlands are relatively well documented. However, the effects of such disturbance on fluvial carbon (C) losses has, thus far, been overlooked and remains unaccounted for in these ecosystem C budgets. Here, three land-cover classes in Central Kalimantan, Indonesia, were investigated in order to determine the effect of tropical peatland disturbance on fluvial organic C budgets. Intact peat swamp forest (IPSF), moderately disturbed and severely disturbed peat swamp forest (DPSF1 and 2) catchmen

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Allen, Laura. "The application of biodiversity indicators to infer ecosystem health in regenerating tropical forest." Thesis, University of Glasgow, 2019. http://theses.gla.ac.uk/40949/.

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There are an overwhelming number of biodiversity indices and indicators available for ecologists and conservationists to use when seeking to understand how biodiversity responds to human disturbance. In choosing between measures there is often an underlying assumption that if a measure works well for one group it will be equally applicable to another. In this study, I use multiple taxa to explore the performance of a wide range of alpha and beta diversity measures for studying biodiversity responses to human disturbance in tropical forest. I sampled 18 sites along a gradient of human disturban

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Sullivan, Caroline. "Valuation of non-timber forest products : a case study for three Amerindian villages in Guyana." Thesis, Keele University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301458.

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Queiroz, Ana Maria de. "Caracterização limnológica do Lagamar do Cauípe-planície costeira do município de Caucaia-Ce." reponame:Repositório Institucional da UFC, 2003. http://www.repositorio.ufc.br/handle/riufc/16023.

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QUEIROZ, Ana Maria de. Caracterização limnológica do Lagamar do Cauípe-planície costeira do município de Caucaia-Ce. 2003. 203 f : Dissertação (mestrado) - Universidade Federal do Ceará, Pró-Reitoria de Pesquisa e Pós-Graduação, Mestrado em Desenvolvimento e Meio Ambiente - PRODEMA, Fortaleza-CE, 2005.<br>Submitted by demia Maia (demiamlm@gmail.com) on 2016-04-04T13:27:01Z No. of bitstreams: 1 2003_dis_amqueiroz.pdf: 4385788 bytes, checksum: 7d132ec12eaaa87b97b557c5bbe687da (MD5)<br>Approved for entry into archive by demia Maia(demiamlm@gmail.com) on 2016-04-04T13:28:01Z (GMT) No. of bitstream

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Xavier, Rafael de Oliveira. "Determinant factors to the dominance of African grasses in two tropical seasonally dry ecosystems." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7628.

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Janeau, Jean-Louis. "Déterminants physiques et biologiques de l'infiltration : cas d'études de sols tropicaux en Afrique, en Asie et en Amérique latine." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2368/.

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L'étude de l'infiltration de l'eau dans le sol en fonction des états de surface a été abordée sous différents climats (Mexique, Equateur, Afrique du Sud, Thaïlande, Vietnam) en testant l'influence des déterminants physiques (gradient de pente, pratiques culturales) et biologiques (couvert végétal, ingénieurs du sol) sur l'infiltration. La simulation de pluie et la description des états de surface ont été utilisées pour tester et analyser les comportements hydrodynamiques superficiels et la détachabilité des sols. Les faibles gradients de pente et certaines pratiques culturales sensés favoriser

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Saulei, Simon M. "The recovery of tropical lowland rainforest after clearfell logging in the Gogol Valley, Papua New Guinea." Thesis, University of Aberdeen, 1985. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU363256.

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Recovery of tropical rain forest in Gogol Valley, Papua New Guinea was monitored for 2 years following clear-fel1ing in the wet and dry seasons. Further redevelopment, reconstructed by measurements of regrowth of known ages from 1.5-10.8 years, were compared with forest heavily disturbed by fire 55 years ago and primary forest. The vegetation, survey was assessed principally by Counting and measuring trees. Because of the importance of soil seed bank in influencing vegetation recovery processes, special attention was given to the spatial and temporal changes in the soil seed bank and the seed

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42

Marinho, Osmarina Alves. "Effect of UV-B radiation on plant litter decomposition in a tropical ecosystem on the north coast of the State of Sao Paulo, southeast Brazil." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-02052018-181849/.

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The solar radiation in general and UV radiation in particular has been recognized to stimulate plant litter decomposition through photochemical mineralization of photosensitive organic molecules, such as lignin, facilitating microbial decomposition, with great relevance role in dryland ecosystems where microbial activity is low, however little is known about how photodegradation could influence other ecosystems without moisture limitations and under what conditions may be favored, therefore the mechanisms has not yet been established. Decomposition in tropical ecosystem is a complex process an

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Queiroz, Ana Maria de. "CaracterizaÃÃo limnolÃgica do Lagamar do CauÃpe-planÃcie costeira do municÃpio de Caucaia-Ce." Universidade Federal do CearÃ, 2003. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1576.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Pesquisas limnolÃgicas em regiÃes trÃpicais sÃo bastante escassas, principalmente se forem consideradas as de longa duraÃÃo. Este trabalho, desenvolvido no Lagamar do CauÃpe (planÃcie costeira do municÃpio de Caucaia â CearÃ), durante o perÃodo de junho de 2001 a fevereiro de 2002, objetivou efetuar um diagnÃstico sobre as caracterÃsticas fÃsicas, quÃmicas e ambientais da lagoa situada no Lagamar do CauÃpe e obter informaÃÃes bÃsicas que possibilitem subsidiar programas de gerenciamento e aproveitamento adequado desse re

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Hatfield, Jack Henry. "The impacts of habitat loss and fragmentation upon the maintenance of biodiversity in tropical ecosystems." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/63830.

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Habitat loss and fragmentation are major threats to biodiversity on a global scale. Human modified landscapes now comprise large areas of the globe, heavily contributing to the observed decline in biodiversity. By understanding the processes governing species communities in these fragmented landscapes we may be better able to manage them in a way that provides conservation benefits. The first part of this thesis focuses on dispersal in complex landscapes with Chapter 2 taking a regional view, examining connectivity across the whole Brazilian Atlantic Forest from a functional perspective and Ch

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Kondoh(Tsuji), Shoko. "Ecophysiological study on drought stress strategy of trees in humid and semi-arid tropical ecosystems." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136824.

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Eriksson, Björn. "Biodiversity at the ecosystem level : structural variation among food webs in temperate and tropical areas." Thesis, Linköpings universitet, Biologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108120.

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Biodiversity is a fundamental part of the functioning of ecosystems and their ability to provide ecosystem services. It has been shown that a high biodiversity increases the robustness of an ecosystem according to the insurance hypothesis. I propose that a similar effect can be seen on a higher scale, where a high diversity of ecosystem types might stabilize the ecological functionality of a region. By comparing eleven network characters in 70 tropical and temperate ecosystems, their diversity was measured as Euclidean distance between the systems in the 11-dimensional room defined by these ch

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Bertoli, Giuseppe Colonnello. "The environmental impact of flow regulation in a tropical delta : the case of the Manamo distributary in the Orinoco Delta, Venezuela." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/8947.

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The regulation of the Manama river, one of the major Orinoco distributary channels, has instigated changes in the hydrological and sedimentological regimes of its channel and surrounding wetlands, covering one-third of the Delta area. The dam has altered the hydrodynamics of the Manama. While the average flow of its channel was reduced from 10% to 0.5% (200 m3/s), of the annual discharge of the Orinoco River. The adjacent Macareo distributary, which is not regulated, discharges 11% (4,000 m3/s) annually. During the seasonal high-water period, the water level in the Macareo rises approximately

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Moellendorf, Suzanne M. "Effects of irrigation canals on stream ecosystems in a tropical dry forest region of Costa Rica." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024889.

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Kodandapani, Narendran. "Fire regimes and their ecological effects in seasonally dry tropical ecosystems in the Western Ghats, India." Diss., Connect to online resource - MSU authorized users, 2006.

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Kurokawa, Hiroko. "Defensive strategies of tropical trees by phenolic compounds and their effects on decomposition in forest ecosystems." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147864.

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