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Dissertations / Theses on the topic 'Ecosystem threat'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Dunga, Victor Loyiso. "Mapping and assessing ecosystem threat status of South African kelp forests." Master's thesis, Faculty of Science, 2020. http://hdl.handle.net/11427/32241.

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At a global scale, kelp forests play a significant ecological, social and economic role through their provision of ecosystem services. South African kelp forests are no exception and recent studies have established their value. To maintain these benefits, informed management is needed. An understanding of kelp forest distribution, ecosystem functioning, pressures, and ecosystem state are key requirements for effective management. The South African National Biodiversity Assessment (NBA) synthesises research to report on the status of ecosystems to guide policy, planning and decision making. Kel

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2

Wilson, Daniel. "Atmospheric deposition of combined nitrogen in the Cape Metropolitan Area : a threat to a species rich ecosystem?" Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/6266.

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Includes abstract.<br>Includes bibliographical references (leaves 161-173).<br>In this project. two broad approaches were used in order to gauge levels of atmospheric N deposition to the natural vegetation of the Cape Metropolitan Area (CMA). In the first approach, bulk collectors were constructed and set up at five sites around the CMA in order to trap atmospheric deposition for chemical analysis. In the second approach, moss samples collected from different parts of the CMA during various historical periods, were analysed for N concentration, C: N ratio and 15N/14N isotope ratio in order to

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3

Haller, Vanessa. "Ecological models for threat management: Considering the unknowns using numerical analysis and machine learning." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/210467/1/Vanessa_Haller_Thesis.pdf.

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The thesis tackles the problem of uncertainty in the modelling of ecosystems of any complexity. This uncertainty can originate from many sources including missing knowledge of interactions or low data availability. The major contribution of the thesis is a new workflow that extends on the traditional scientific method to allow for the thorough investigation of uncertainty in especially data poor system utilising new techniques such as machine learning.

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4

Adrees, Muhammad. "Nitrogen and ozone pollution : a threat to natural ecosystems." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9611.

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During the last century, inputs of reactive nitrogen (N) to ecosystems have more than doubled as a result of anthropogenic activities. There is strong evidence that N has reduced the diversity of plant species in a range of habitats of high conservation value. The effects of atmospheric N deposition on the structure and functioning of natural and semi-natural ecosystems have been well studied. There has, however, been little investigation of the contrasting effects of reduced versus oxidised N, or of the importance of frequency of inputs. This thesis involves a study which investigates the res

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Venna, Nagarjuna. "The evolving nature of competition in the wireless ecosystem : emergent opportunities and threats." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55300.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2009.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student submitted PDF version of thesis.<br>Includes bibliographical references.<br>By the end of 2008, there are over 4 billion mobile cellular subscriptions worldwide, translating into a penetration rate of 61%. In developed economies like the United States, the penetration rate has reached over 85%. Even though the subscriber num

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6

Donnelly, Melinda. "IS THE EXOTIC BRAZILIAN PEPPER, SCHINUS TEREBINTHIFOLIUS, A THREAT TO MANGROVE ECOSYSTEMS IN FLORIDA?" Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3328.

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Mangrove ecosystems are critical to Florida, providing economic resources to humans, and untold ecological resources to estuarine organisms. In Florida's estuaries, mangrove ecosystems have suffered significant losses due to natural and human disturbances; these disturbances potentially leave mangrove communities vulnerable to invasion by the opportunistic exotic, Schinus terebinthifolius (Brazilian pepper). Prior experiments have suggested that Schinus terebinthifolius is unable to survive under marine conditions and poses no long term threat to mangrove systems. However, this contradicts fie

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7

Street, Rachel Anna. "Emissions of non-methane hydrocarbons from three forest ecosystems." Thesis, Lancaster University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260959.

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8

Ayereby, Manouan Pierre-Marius. "Overcoming Data Breaches and Human Factors in Minimizing Threats to Cyber-Security Ecosystems." ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/6163.

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This mixed-methods study focused on the internal human factors responsible for data breaches that could cause adverse impacts on organizations. Based on the Swiss cheese theory, the study was designed to examine preventative measures that managers could implement to minimize potential data breaches resulting from internal employees' behaviors. The purpose of this study was to provide insight to managers about developing strategies that could prevent data breaches from cyber-threats by focusing on the specific internal human factors responsible for data breaches, the root causes, and the preven

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9

Go, Dong-Hun. "Three Essays in Economics of Prey-Predator Relation." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7031.

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This dissertation explores how natural ecosystem can be integrated with economic system through two case studies of multiple species interactions, or predator-prey relations. By the inclusion of biological, ecological and economic aspects, the integrated approaches aim at more clearly understanding of how regional ecosystem and economy interact with each other, given threats of resource extinction and environmental shock. I also explain strategies and policy regimes that can be considered to achieve efficient and sustainable ecosystem management in those circumstances. The first case study foc

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10

Atiénzar, Navarro Francisco. "Feeding and breeding ecology of three insectivorous birds in Mediterranean ecosystems." Doctoral thesis, Universitat de València, 2009. http://hdl.handle.net/10803/31956.

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Tits (Paridae) are one of the most and better passerines known owing to they are broadly distributed, breeding in different habitats from gardens to forests, and they make use of nest boxes for breeding. Hence, such species are ideal for comparative studies on a large geographical scale. Despite the great amount of information concerned to tits, we still do not really understand life-history strategies of birds living under most ecological conditions. The present thesis is focused on achieving a better understanding of how birds are adapted to their environment. In particular, to examine the e

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11

Zachmann, Luke J. "Drivers of Plant Population Dynamics in Three Arid to Subhumid Ecosystems." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/544.

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Understanding the relative importance of density-dependent and density-independent factors in driving population dynamics is one of the oldest challenges in ecology, and may play a critical role in predicting the effects of climate change on populations. We used long-term observational data to describe patterns in plant population regulation for 57 forb and grass species from three different ecosystems (arid desert grassland, semiarid sagebrush steppe, and subhumid mixed-grass prairie). Using a hierarchical partitioning approach, we (i) quantified the relative influence of conspecific density,

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12

Zhang, Wendong. "Three Essays on Land Use, Land Management, and Land Values in the Agro-Ecosystem." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437656707.

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13

Paul, Miriam. "Restoring Rainforest – the Capacities of Three Different Reforestation Pathways to Re-establish Ecosystem Properties." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366066.

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The broad scale destruction of tropical and subtropical rainforests has been one of the largest land-cover conversions taking place on earth, with a wide range of deleterious consequences at local, landscape, and global scales. While the resulting loss of biodiversity and habitat for rainforest-dependent fauna and flora has been well-studied as a major effect, clearing of rainforests also significantly influences soil processes such as biochemical cycles and microbial functions. More recently, there has been a growing public interest in reforestation activities. There are a range of different

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14

Coppus, Ruben. "Landscape sensitivity to erosion in three semi-arid Central Andean geo-ecosystems." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/63757.

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15

Carle, Robin Jean. "Factors affecting nest survival of three species of migrant songbirds in the Greater Yellowstone Ecosystem." Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/carle/CarleR0506.pdf.

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16

Reay, Stephen. "Design for ecosystem function: three ecologically based design interventions to support New Zealand’s indigenous biodiversity." AUT University, 2009. http://hdl.handle.net/10292/821.

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This research project explores opportunities for sustainable design in New Zealand. Recently a new framework for sustainable design was proposed by environmental chemist Michael Braungart and architect William McDonough who suggest that the current paradigm of cradle to grave product development is unable to provide a solution to the world’s current ecological crisis, and a “cradle to cradle” framework is more appropriate. They suggest that their approach, based on examples from nature, ensures that all human activities have a positive ecological footprint, capable of replenishing and regenera

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17

Keatley, Bronwyn Elizabeth. "Limnological and paleolimnological investigations of environmental change in three distinct ecosystem types, Canadian High Arctic." Thesis, Kingston, Ont. : [s.n.], 2007. http://hdl.handle.net/1974/697.

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18

Malatesta, Luca. "Biodiversity and ecosystems dynamics of rangelands on a climatic gradient in face of management and desertification threats." Doctoral thesis, Università degli Studi di Camerino, 2015. http://hdl.handle.net/11581/401734.

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19

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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20

Bruce, Louise Christina. "A study of the interaction between the physical and ecological processes of three aquatic ecosystems." University of Western Australia. Centre for Water Research, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0178.

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Due to the complex nature of aquatic food webs, the interaction between abiotic and biotic factors that govern ecosystem dynamics is often elusive. Recent advancements in both the collection of reliable field data and the development of ecological models have enabled researchers to gain insights into these more complex interactions. In this study the relationship between physical and ecological processes has been explored by applying a process based coupled physical and ecological model (DYRESM-CAEDYM) to the data sets of three aquatic ecosystems. In the first, the role of zooplankton in the n

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21

López, Muñoz Ignacio Francisco. "Optimal spatial arrangements of three ecosystems: microalgae pond, anaerobic digester and aerobic wastewater treatment plant." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/139852.

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Ingeniero Civil en Biotecnología<br>Ingeniero Civil Químico<br>Actualmente existen diversos problemas medioambientales, dos de ellos corresponden a la futura crisis energética, debido al agotamiento de los combustibles fósiles, y a la existencia de aguas residuales con altas concentraciones de nitrógeno y carbono. Un microorganismo llamado microalga podría ser una potencial solución a estos problemas, ya que éstos consumen nitrógeno y carbono para acumular lípidos en su medio intracelular, el cual posteriormente es procesado para producir biocombustibles. Sin embargo, la producción de energía

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Bruce, Louise Christina. "A study of the interaction between the physical and ecological processes of three aquatic ecosystems /." Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2007.0178.

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23

Cifuentes, de Gramajo Luisa. "Nejayote produced at household level by Mayan women in Guatemala : is it a threat to aquatic ecosystems or a resource for food security?" Thesis, Högskolan Kristianstad, Sektionen för lärande och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-8557.

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The aim of this study was to find out if nejayote produced at household level in Guatemala represents a threat to aquatic ecosystems and, if so, propose sustainable processing, reuse and disposal methods. First, all aspects related to nejayote production were explored. This study presents combined results from literature study on corn consumption and Guatemalan demography, a survey to Guatemalan women of all ethnical groups, nixtamalization replica and solids removal experiments and laboratory analysis. Findings indicate that the source of nejayote are approximate 600 000 tones of corn nixtama

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24

Lenes, Jason M. "Saharan dust and phosphatic fidelity : a three dimensional biogeochemical model of Trichodesmium on the West Florida shelf." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001476.

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25

Wallin, Jakob. "Plant-pollinator networks in three habitats on a baltic island." Thesis, Högskolan på Gotland, Institutionen för kultur, energi och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hgo:diva-1009.

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Plant-pollinator networks have shown to be highly dynamic systems as species and interactions change in time and space. Few studies have incorporated several habitats in their network. In this work I investigate interacting plant and pollinator communities of three adjacent habitats at Gotska Sandön, an island in the Baltic Sea. The networks varied in size between the habitats, and the larger networks of the dune and meadow displayed both nested and modular structure while the smaller forest network was more randomly organised. We found species present in more than one habitat that connected t

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26

Dopolo, Mbulelo Tomie. "Comparing the coarse- and high-resolution horizontal and vertical egg distribution patterns of three clupeiform species in the southern Benguela ecosystem." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/6969.

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Bibliography: leaves 122-159.<br>Three fish species, anchovy Engraulis encrasicolus, sardine Sardinops sagax and round herring Etrumeus whiteheadi, co-exist over the western Agulhas Bank (W AB) in the southern Benguela upwelling ecosystem. To date, data on high-resolution distributions in ichthyoplankton in the region is lacking. To address this need, coarse and high-resolution ichthyoplankton data were collected using a California vertical egg tow (CalVET) net and a continuous, underway fish egg sampler (CUFES) for horizontal data, respectively, and plankton pump and a closing WP II net for v

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27

Gerling, Sebastian Rainer Verfasser], and Michael [Akademischer Betreuer] [Backes. "Plugging in trust and privacy : three systems to improve widely used ecosystems / Sebastian Rainer Gerling. Betreuer: Michael Backes." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2014. http://d-nb.info/106430575X/34.

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28

Thiet, Rachel Kay. "Soil microbial community pattern and process : impacts on vascular plant communities in three ecosystems of high conservation value /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486459267521939.

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29

Yelekci, Ozge. "Numerical Simulations Of Eutrophication Processes In Izmir Bay With A Coupled Three Dimensional Eco-hydrodynamic Model." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615701/index.pdf.

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A three dimensional time-dependent coupled ecosystem model is applied to Izmir Bay for the first time. Delft3D modelling suite&rsquo<br>s FLOW and ECO modules are adapted and tuned for the region. A reference model with a time frame of three years is produced that represents the current physical and biogeochemical status of the bay. Model skill assessment methods are used as a measure of model performance and to address the shortcomings of it. The hydrodynamics model is able to produce physical features in terms of seasonality and spatial distribution within reasonable ranges, whereas the ecos

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30

van, Zuijlen Kristel. "Climate change effects on freezing damage in three subarctic bryophytes : A snow manipulation field experiment in a tundra ecosystem in Abisko, Sweden." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112176.

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Climate change is expected to have a large impact on northern ecosystems. Increased temperatures and altered precipitation and snow cover patterns will have a great impact on subarctic tundra. Bryophytes form an important component of tundra ecosystems because of their high abundance and their importance in many ecological processes. The effect of elevation and snow cover on freezing damage in shoots of three subarctic bryophytes: Ptilidium ciliare, Hylocomium splendens and Sphagnum fuscum, was studied in a snow manipulation field experiment at different elevations in Abisko, Sweden, during ea

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31

Valman, Matilda. "Three faces of HELCOM - institution, organization, policy producer." Doctoral thesis, Stockholms universitet, Statsvetenskapliga institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108455.

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Despite early initiatives during the 1960s and 1970s, and continuing efforts ever since, the Baltic Sea remains in poor condition. The Helsinki Commission (HELCOM) is the governing body tasked with protecting the marine environment from further deterioration through intergovernmental collaboration between the Baltic Sea states and the EU. In 2007, HELCOM launched a new tool – the Baltic Sea Action Plan (BSAP), of which the so-called ecosystem approach is a cornerstone. However, how and why the BSAP reform was launched, and also what consequences such management reforms can have for transbounda

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Marchesini, Alexis. "Relationships among the three levels of biodiversity - genes, species and ecosystems: an empirical study with alpine amphibians from Trentino." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3422885.

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In the present study, we investigated amphibian biodiversity of a south-eastern Alpine region, Trentino, considering the evolutionary and ecological processes acting at the different levels of biological diversity (i.e. genes, species, and ecosystems), within a systemic perspective. We chose a model organism, the common frog (Rana temporaria), as target species for investigating patterns of diversity at the genetic level. We investigated the past evolutionary history of Rana temporaria by means of a phylogeographic study, based on mtDNA data. We highlighted a complex scenario, with three diff

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Laceby, John Patrick. "The Provenance of Sediment in Three Rural Catchments in South East Queensland, Australia." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/367963.

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Moreton Bay, in South East Queensland, Australia, is a Ramsar wetland of international significance. A decline of the bay’s ecosystem health has been primarily attributed to sediments and nutrients from catchment sources. The Healthy Country (HC) project, a Queensland Government funded ‘proof of concept’ initiative, is dedicated to reducing rural diffuse sediments and nutrients entering waterways and ultimately Moreton Bay. Three focal catchments, Blackfellow Creek, Knapp Creek and the Upper Bremer River, were selected to trial rehabilitation techniques for the region. Sediment budgets for the

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34

Saleh, Selman Andrea. "Bridging the regional scale and local contexts in the pursuit of sustainable interventions : Three cases along the Mapocho River in Santiago, Chile." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263165.

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Alike many urban rivers, the Mapocho River in Santiago withstands enormous pressures from urban development. In the last decades there has been an increasing interest in the river, opening an opportunity to intervene its riparian areas where land is still available. But there is also the threat that future interventions will continue to be treated in isolation and respond to sectorial interests, hindering the river’s potential in the long run. With this in mind, the research aims to explore a way of understanding local contexts that takes into account both regional and local realities, providi

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Reichstein, Markus. "Drought effects on carbon and water exchange in three mediterranean ecosystems : a combined top-down and bottom-up analysis of eddy covariance and sapflow data /." Bayreuth : Selbstverl. des Bayreuther Inst. für Terrestrische Ökosystemforschungen, 2001. http://www.gbv.de/dms/bs/toc/347265030.pdf.

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36

Keeble, Kathryn. "Common drivers and indicators of large-scale changes in the community structure and function of three UK marine ecosystems : the Irish Sea, North Sea and Western English Channel." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577148.

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The occurrence of regime shifts in large marine ecosystems is unproven and controversial. Despite this, a number of marine regime shifts are reported to have occurred during the last century. These shifts have been largely attributed to overfishing and climate change, and have had important consequences for marine ecosystem structure and function. Understanding the relationships between ecosystem pressures and responses is a critical step towards an effective ecosystem approach to management. Ecosystem models are a useful way of investigating how ecosystems respond to changes in pressures at t

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Nsor, Collins Ayine. "Plant community distribution and diversity, and threats to vegetation of the Kromme River peat basins, Eastern Cape Province, South Africa." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1007151.

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This study examined the current plant diversity status and the impact of drivers of change on the peat basins of the Kromme River peatland. It was conducted at six sites over sixty one years in the Eastern Cape Province of South Africa. I reviewed the rapid habitat and biodiversity loss of wetlands globally and discussed the distribution of wetlands and specifically peatlands in South Africa. Plant species diversity was assessed using Modified- Whittaker plots. The influence of environmental variables on floristic composition and distribution was investigated using ordination techniques (DCA a

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Reay, Stephen. "Design for ecosystem function three ecologically based design interventions to support New Zealand's indigenous biodiversity : a thesis/dissertation submitted to Auckland University of Technology in fulfilment of the requirements for the degree of Master of Philosophy (MPhil), 2009 /." Click here to access this resource online, 2009. http://hdl.handle.net/10292/821.

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39

Oddsberg, Josefina. "An analysis of the potential of local stewardship as a management mode for increasing and enhancing ecosystem services in the urban landscape : Three case studies in Stockholm Municipality – Igelbäcken Allotment Garden, Akalla Allotment Garden and the Vinterviken Garden." Thesis, Stockholms universitet, Stockholm Resilience Centre, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-63365.

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The capacity of urban areas for generating quality of life is largely dependent on theecological processes and the green spaces of the cityscape. The ecosystem services supportedand generated by urban green spaces are fundamental to human well being in cities.Hence, this master thesis explores the possibilities of local stewardship as a possiblemanagement mode for enhancing ecosystem services in the urban landscape. It does so by ananalysis of management rights to state-owned lands in the municipality of Stockholm andthrough evaluating to what extent the institutional structure of the manageme

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DELL'ACQUA, OMBRETTA. "Response to climate change in Antarctic benthos - Environmental change in Antarctic marine ecosystem: study of long term observations and ocean acidification experiments to better understand the destiny of three key benthic species in the Terra Nova Bay littoral (Ross Sea): Adamussium colbecki, Sterechinus neumayeri and Odontaster validus." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929157.

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Climate changes effects include ocean acidification and, possibly, the alteration of frequency and magnitude of climate events, such as El Niño. All environmental global changes are supposed to be a major threat to ecosystem, both terrestrial and marine. Despite the amazing bulk of literature on these last, few efforts have been devoted to polar regions, which are actually likely to be the most fragile environments on the Earth. In this work we want to elucidate the response, to environmental modifications, of three Antarctic benthic macroinvertebrates: the scallop Adamussium colbecki, the sea

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Habron, Geoffrey Bryan. "An assessment of community-based adaptive watershed management in three Umpqua Basin Watersheds /." 1999. http://hdl.handle.net/1957/8349.

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42

Zhou, Zhou. "Three essays on platform economy." Thesis, 2021. https://hdl.handle.net/2144/42550.

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Platforms are the critical players driving the digital economy. My thesis focuses on the platform economy, especially the competitive advantage of platforms. On the one hand, what factors affect the competitive advantage of platforms? How does the platform form the competitive advantage? These questions are related to platform strategy. On the other hand, does the competitive advantage of platforms harm social welfare? This question is related to regulatory issues. The first chapter of my dissertation studies how different aspects of user effects drive value in two-sided markets. We first

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O'Keefe, Thomas. "Spatial and temporal patterns in aquatic ecosystems : three case studies /." 2001. http://www.library.wisc.edu/databases/connect/dissertations.html.

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Miteva, Daniela. "Three Essays On Protecting Biodiversity In Developing Countries." Diss., 2013. http://hdl.handle.net/10161/7247.

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<p>Developing countries often hoard the largest number of species, but also experience very high poverty levels. This dissertation reviews the evidence of the performance common conservation interventions. I find that despite the billions of dollars channeled towards conservation efforts annually, there is still very limited evidence whether or not conservation policies work. The evidence has been limited to exceptional countries like Costa Rica and Thailand and outlines like deforestation, without considering ecosystem function and ecosystem services. Furthermore, I find that the conservation

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Tjiputra, Jerry Fong. "Analysis of marine ecosystem dynamic using an adjoint three-dimensional ocean carbon cycle model /." 2007. http://www.library.wisc.edu/databases/connect/dissertations.html.

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46

Greco, Angelica. "Digital transformation and disruption: threat or opportunity for the traditional insurance incumbents?" Master's thesis, 2018. http://hdl.handle.net/10362/39067.

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Digital technology often destroys value. What happens is, for some companies to become market winners and for others, digital technology turns to be the reason of their failure. There is one clear winner coming out from this battle: consumers. Traditional insurance business model seemed resilient from digital technology. However, this resilience is not lasting forever. Actually, it is now starting to collapse. Digital is transforming the way products and services are served to the customers and also the underlying business models. Big data and analytics, Internet of Things (IoT), Automat

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CHIUNG-PIN, LIU, and 劉瓊霦. "Changes in Water Chemistry of Precipitation Passing through Three Forests of the Guandaushi Forest Ecosystem." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/56982951375147429045.

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博士<br>國立中興大學<br>森林學系<br>88<br>The study objectives were to compare the changes of water chemistry of bulk precipitation, throughfall and stemflow for 3 types of forest stands, China-fir (Cunninghamia lanceolata) plantation, secondary hardwood stand, and natural hardwood stand in Guandaushi Forest, in central Taiwan from January 1996 to December 1998. Annual bulk precipitation had an average pH of 4.05 and stemflow of China-fir plantation was little more acidic than bulk precipitation, but throughfall of China-fir plantation almost maintain the same pH as in bulk precipitation. The

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Enoch, Candace. "A spatial analysis of the threats to water quality of freshwater ecosystem priority areas in the upper crocodile catchment." Thesis, 2018. https://hdl.handle.net/10539/25756.

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Degree of Master of Science by research only: A dissertation submitted to the Faculty of Science, University of the Witswatersrand, in partial fulfilment of the requirements for the degree of Master of Science Johannesburg, 2018<br>Freshwater ecosystems are under increasing pressure to sustain their functions on both a global and local scale. In light of growing concern regarding the pollution of South African rivers, this study focused on identifying potential threats to water quality of freshwater ecosystem priority areas (FEPAs) within the Upper Crocodile catchment. Nine sample sites loca

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Petrou, K. "From the ice to the open ocean : threats to phytoplankton productivity in the Antarctic marine ecosystem from a changing climate." Thesis, 2010. http://hdl.handle.net/10453/36273.

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University of Technology, Sydney. Faculty of Science.<br>The Antarctic marine ecosystem is unique and dynamic, changing seasonally and forming specialised niche habitats including open ocean, sea ice and meltwater environments. Phytoplankton are key species in the structure and function of the Antarctic ecosystem, instrumental in the regions biogeochemistry, fundamental to the food web and strong contributors to global primary production and carbon sequestration. Understanding the photosynthetic plasticity of Antarctic phytoplankton is essential to understanding the effects global change is li

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Humphreys, Elyn R. "Net ecosystem production of three coastal Douglas-fir stands at different stages of development after harvesting." Thesis, 2004. http://hdl.handle.net/2429/15825.

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Forest harvesting and succession have a major impact on the dynamics of carbon exchange between forests and the atmosphere. This thesis examines the differences in stand-level fluxes of carbon dioxide (C02) and the biophysical factors, which affect respiration and photosynthesis in three different coastal Douglas-fir stands at different stages of development after harvesting. The eddy covariance technique was used to measure stand-level CO2 fluxes in Douglas-fir stands established in 2000, 1988, and 1948 on the east coast of Vancouver Island, British Columbia. A portable soil chamber sy

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