104 research outputs found

    Assessing uncertainties of in situ FAPAR measurements across different forest ecosystems

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    Carbon balances are important for understanding global climate change. Assessing such balances on a local scale depends on accurate measurements of material flows to calculate the productivity of the ecosystem. The productivity of the Earth's biosphere, in turn, depends on the ability of plants to absorb sunlight and assimilate biomass. Over the past decades, numerous Earth observation missions from satellites have created new opportunities to derive so-called “essential climate variables” (ECVs), including important variables of the terrestrial biosphere, that can be used to assess the productivity of our Earth's system. One of these ECVs is the “fraction of absorbed photosynthetically active radiation” (FAPAR) which is needed to calculate the global carbon balance. FAPAR relates the available photosynthetically active radiation (PAR) in the wavelength range between 400 and 700 nm to the absorption of plants and thus quantifies the status and temporal development of vegetation. In order to ensure accurate datasets of global FAPAR, the UN/WMO institution “Global Climate Observing System” (GCOS) declared an accuracy target of 10% (or 0.05) as acceptable for FAPAR products. Since current satellite derived FAPAR products still fail to meet this accuracy target, especially in forest ecosystems, in situ FAPAR measurements are needed to validate FAPAR products and improve them in the future. However, it is known that in situ FAPAR measurements can be affected by significant systematic as well as statistical errors (i.e., “bias”) depending on the choice of measurement method and prevailing environmental conditions. So far, uncertainties of in situ FAPAR have been reproduced theoretically in simulations with radiation transfer models (RTMs), but the findings have been validated neither in field experiments nor in different forest ecosystems. However, an uncertainty assessment of FAPAR in field experiments is essential to develop practicable measurement protocols. This work investigates the accuracy of in situ FAPAR measurements and sources of uncertainties based on multi-year, 10-minute PAR measurements with wireless sensor networks (WSNs) at three sites on three continents to represent different forest ecosystems: a mixed spruce forest at the site “Graswang” in Southern Germany, a boreal deciduous forest at the site “Peace River” in Northern Alberta, Canada and a tropical dry forest (TDF) at the site “Santa Rosa”, Costa Rica. The main statements of the research results achieved in this thesis are briefly summarized below: Uncertainties of instantaneous FAPAR in forest ecosystems can be assessed with Wireless Sensor Networks and additional meteorological and phenological observations. In this thesis, two methods for a FAPAR bias assessment have been developed. First, for assessing the bias of the so-called two-flux FAPAR estimate, the difference between FAPAR acquired under diffuse light conditions and two-flux FAPAR acquired during clear-sky conditions can be investigated. Therefore, measurements of incoming and transmitted PAR are required to calculate the two-flux FAPAR estimate as well as observations of the ratio of diffuse-to-total incident radiation. Second, to assess the bias of not only the two- but also the three-flux FAPAR estimate, four-flux FAPAR observations must be carried out, i.e. measurements of top-of-canopy (TOC) PAR albedo and PAR albedo of the forest background. Then, to quantify the bias of the two and three-flux estimate, the difference with the four-flux estimate can be calculated. Main sources of uncertainty of in situ FAPAR measurements are high solar zenith angle, occurrence of colored leaves and increased wind speed. At all sites, FAPAR observations exhibited considerable seasonal variability due to the phenological development of the forests (Graswang: 0.89 to 0.99 ±0.02; Peace River: 0.55 to 0.87 ±0.03; Santa Rosa: 0.45 to 0.97 ±0.06). Under certain environmental conditions, FAPAR was affected by systemic errors, i.e. bias that go beyond phenologically explainable fluctuations. The in situ observations confirmed a significant overestimation of FAPAR by up to 0.06 at solar zenith angles above 60° and by up to 0.05 under the occurrence of colored leaves of deciduous trees. The results confirm theoretical findings from radiation transfer simulations, which could now for the first time be quantified under field conditions. As a new finding, the influence of wind speed could be shown, which was particularly evident at the boreal location with a significant bias of FAPAR values at wind speeds above 5 ms-1. The uncertainties of the two-flux FAPAR estimate are acceptable under typical summer conditions. Three-flux or four-flux FAPAR measurements do not necessarily increase the accuracy of the estimate. The highest average relative bias of different FAPAR estimates were 2.1% in Graswang, 8.4% in Peace River and -4.5% in Santa Rosa. Thus, the GCOS accuracy threshold of 10% set by the GCOS was generally not exceeded. The two-flux FAPAR estimate was only found to be biased during high wind speeds, as changes in the TOC PAR albedo are not considered in two-flux FAPAR measurements. Under typical summer conditions, i.e. low wind speed, small solar zenith angle and green leaves, two-flux FAPAR measurements can be recommended for the validation of satellite-based FAPAR products. Based on the results obtained, it must be emphasized that the three-flux FAPAR estimate, which has often been preferred in previous studies, is not necessarily more accurate, which was particularly evident in the tropical location. The discrepancies between ground measurements and the current Sentinel-2 FAPAR product still largely exceed the GCOS target accuracy at the respective study sites, even when considering uncertainties of FAPAR ground measurements. It was found that the Sentinel-2 (S2) FAPAR product systematically underestimated the ground observations at all three study sites (i.e. negative values for the mean relative bias in percent). The highest agreement was observed at the boreal site Peace River with a mean relative deviation of -13% (RÂČ=0.67). At Graswang and Santa Rosa, the mean relative deviations were -20% (RÂČ=0.68) and -25% (RÂČ=0.26), respectively. It was argued that these high discrepancies resulted from both the generic nature of the algorithm and the higher ecosystem complexity of the sites Graswang and Santa Rosa. It was also found that the temporal aggregation method of FAPAR ground data should be well considered for comparison with the S2 FAPAR product, which refers to daily averages, as overestimation of FAPAR during high solar zenith angles could distort validation results. However, considering uncertainties of ground measurements, the S2 FAPAR product met the GCOS accuracy requirements only at the boreal study site. Overall, it has been shown that the S2 FAPAR product is already well suited to assess the temporal variability of FAPAR, but due to the low accuracy of the absolute values, the possibilities to feed global production efficiency models and evaluate global carbon balances are currently limited. The accuracy of satellite derived FAPAR depends on the complexity of the observed forest ecosystem. The highest agreement between satellite derived FAPAR product and ground measurements, both in terms of absolute values and spatial variability, was achieved at the boreal site, where the complexity of the ecosystem is lowest considering forest structure variables and species richness. These results have been elaborated and presented in three publications that are at the center of this cumulative thesis. In sum, this work closes a knowledge gap by displaying the interplay of different environmental conditions on the accuracy of situ FAPAR measurements. Since the uncertainties of FAPAR are now quantifiable under field conditions, they should also be considered in future validation studies. In this context, the practical recommendations for the implementation of ground observations given in this thesis can be used to prepare sampling protocols, which are urgently needed to validate and improve global satellite derived FAPAR observations in the future.Projektionen zukĂŒnftiger Kohlenstoffbilanzen sind wichtig fĂŒr das VerstĂ€ndnis des globalen Klimawandels und sind auf genaue Messungen von StoffflĂŒssen zur Berechnung der ProduktivitĂ€t des Erdökosystems angewiesen. Die ProduktivitĂ€t der BiosphĂ€re unserer Erde wiederum ist abhĂ€ngig von der Eigenschaft von Pflanzen, Sonnenlicht zu absorbieren und Biomasse zu assimilieren. Über die letzten Jahrzehnte haben zahlreiche Erdbeobachtungsmissionen von Satelliten neue Möglichkeiten geschaffen, sogenannte „essentielle Klimavariablen“ (ECVs), darunter auch wichtige Variablen der terrestrischen BiosphĂ€re, aus Satellitendaten abzuleiten, mit deren Hilfe man die ProduktivitĂ€t unseres Erdsystems computergestĂŒtzt berechnen kann. Eine dieser „essenziellen Klimavariablen“ ist der Anteil der absorbierten photosynthetisch aktiven Strahlung (FAPAR) die man zur Berechnung der globalen Kohlenstoffbilanz benötigt. FAPAR bezieht die verfĂŒgbare photosynthetisch aktive Strahlung (PAR) im WellenlĂ€ngenbereich zwischen 400 und 700 nm auf die Absorption von Pflanzen und quantifiziert somit Status und die zeitliche Entwicklung von Vegetation. Um möglichst prĂ€zise Informationen aus dem globalen FAPAR zu gewĂ€hrleisten, erklĂ€rte die UN/WMO-Institution zur globalen Klimabeobachtung, das “Global Climate Observing System“ (GCOS), ein Genauigkeitsziel von 10% (bzw. 0.05) FAPAR-Produkte als akzeptabel. Da aktuell satellitengestĂŒtzte FAPAR-Produkte dieses Genauigkeitsziel besonders in Waldökosystemen immer noch verfehlen, werden dringen in situ FAPAR-Messungen benötigt, um die FAPAR-Produkte validieren und in Zukunft verbessern zu können. Man weiß jedoch, dass je nach Auswahl des Messsystems und vorherrschenden Umweltbedingungen in situ FAPAR-Messungen mit erheblichen sowohl systematischen als auch statistischen Fehlern beeinflusst sein können. Bisher wurden diese Fehler in Simulationen mit Strahlungstransfermodellen zwar theoretisch nachvollzogen, aber die dadurch abgeleiteten Befunde sind bisher weder in Feldversuchen noch in unterschiedlichen Waldökosystemen validiert worden. Eine UnsicherheitsabschĂ€tzung von FAPAR im Feldversuch ist allerdings essenziell, um praxistaugliche Messprotokolle entwickeln zu können. Die vorliegende Arbeit untersucht die Genauigkeit von in situ FAPAR-Messungen und Ursachen von Unsicherheit basierend auf mehrjĂ€hrigen, 10-minĂŒtigen PAR-Messungen mit drahtlosen Sensornetzwerken (WSNs) an drei verschiedenen Waldstandorten auf drei Kontinenten: der Standort „Graswang“ in SĂŒddeutschland mit einem Fichten-Mischwald, der Standort „Peace River“ in Nord-Alberta, Kanada mit einem borealen Laubwald und der Standort „Santa Rosa“, Costa Rica mit einem tropischen Trockenwald. Die Hauptaussagen der in dieser Arbeit erzielten Forschungsergebnisse werden im Folgenden kurz zusammengefasst: Unsicherheiten von FAPAR in Waldökosystemen können mit drahtlosen Sensornetzwerken und zusĂ€tzlichen meteorologischen und phĂ€nologischen Beobachtungen quantifiziert werden. In dieser Arbeit wurden zwei Methoden fĂŒr die Bewertung von Unsicherheiten entwickelt. Erstens, um den systematischen Fehler der sogenannten „two-flux“ FAPAR-Messung zu beurteilen, kann die Differenz zwischen FAPAR, das unter diffusen LichtverhĂ€ltnissen aufgenommen wurde, und FAPAR, das unter klaren Himmelsbedingungen aufgenommen wurde, untersucht werden. FĂŒr diese Methode sind Messungen des einfallenden und transmittierten PAR sowie Beobachtungen des VerhĂ€ltnisses von diffuser zur gesamten einfallenden Strahlung erforderlich. Zweitens, um den systematischen Fehler nicht nur der „two-flux“ FAPAR-Messung, sondern auch der „three-flux“ FAPAR-Messung zu beurteilen, mĂŒssen „four-flux“ FAPAR-Messungen durchgefĂŒhrt werden, d.h. zusĂ€tzlich Messungen der PAR Albedo des BlĂ€tterdachs sowie des Waldbodens. Zur Quantifizierung des Fehlers der „two-flux“ und „three-flux“ FAPAR-Messung kann die Differenz zur „four-flux“ FAPAR-Messung herangezogen werden. Die Hauptquellen fĂŒr die Unsicherheit von in situ FAPAR-Messungen sind ein hoher Sonnenzenitwinkel, BlattfĂ€rbung und erhöhte Windgeschwindigkeit. An allen drei Untersuchungsstandorten zeigten die FAPAR-Beobachtungen natĂŒrliche saisonale Schwankungen aufgrund der phĂ€nologischen Entwicklung der WĂ€lder (Graswang: 0,89 bis 0,99 ±0,02; Peace River: 0,55 bis 0,87 ±0,03; Santa Rosa: 0,45 bis 0,97 ±0,06). Unter bestimmten Umweltbedingungen war FAPAR von systematischen Fehlern, d.h. Verzerrungen betroffen, die ĂŒber phĂ€nologisch erklĂ€rbare Schwankungen hinausgehen. So bestĂ€tigten die in situ Beobachtungen eine signifikante ÜberschĂ€tzung von FAPAR um bis zu 0,06 bei Sonnenzenitwinkeln von ĂŒber 60° und um bis zu 0,05 bei Vorkommen gefĂ€rbter BlĂ€tter der LaubbĂ€ume. Die Ergebnisse bestĂ€tigen theoretische Erkenntnisse aus Strahlungstransfersimulationen, die nun erstmalig unter Feldbedingungen quantifiziert werden konnten. Als eine neue Erkenntnis konnte der Einfluss der Windgeschwindigkeit gezeigt werden, der sich besonders am borealen Standort mit einer signifikanten Verzerrung der FAPAR-Werte bei Windgeschwindigkeiten ĂŒber 5 ms-1 Ă€ußerte. Die Unsicherheiten der „two-flux“ FAPAR-Messung sind unter typischen Sommerbedingungen akzeptabel. „Three-flux“ oder „four-flux“ FAPAR-Messungen erhöhen nicht unbedingt die Genauigkeit der AbschĂ€tzung. Die höchsten durchschnittlichen relativen systematischen Fehler verschiedener Methoden zur FAPAR-Messung betrugen 2,1% in Graswang, 8,4% in Peace River und -4,5% in Santa Rosa. Damit wurde der durch GCOS festgelegte Genauigkeitsschwellenwert von 10% im Allgemeinen nicht ĂŒberschritten. Die „two-flux“ FAPAR-Messung wurde nur als fehleranfĂ€llig bei hohe Windgeschwindigkeiten befunden, da Änderungen der PAR-Albedo des BlĂ€tterdachs bei der „two-flux“ FAPAR-Messung nicht berĂŒcksichtigt werden. Unter typischen Sommerbedingungen, also geringe Windgeschwindigkeit, kleiner Sonnenzenitwinkel und grĂŒne BlĂ€tter, kann die „two-flux“ FAPAR-Messung fĂŒr die Validierung von satellitengestĂŒtzten FAPAR-Produkten empfohlen werden. Auf Basis der gewonnenen Ergebnisse muss betont werden, dass die „three-flux“ FAPAR-Messung, die in bisherigen Studien hĂ€ufig bevorzugt wurde, nicht unbedingt weniger fehlerbehaftet sind, was sich insbesondere am tropischen Standort zeigte. Die Abweichungen zwischen Bodenmessungen und dem aktuellen Sentinel-2 FAPAR-Produkt ĂŒberschreiten auch unter BerĂŒcksichtigung von Unsicherheiten in der Messmethodik immer noch weitgehend die GCOS-Zielgenauigkeit an den jeweiligen Untersuchungsstandorten. So zeigte sich, dass das S2 FAPAR-Produkt die Bodenbeobachtungen an allen drei Studienstandorten systematisch unterschĂ€tzte (d.h. negative Werte fĂŒr die mittlere relative Abweichung in Prozent). Die höchste Übereinstimmung wurde am borealen Standort Peace River mit einer mittleren relativen Abweichung von -13% (RÂČ=0,67) beobachtet. An den Standorten Graswang und Santa Rosa betrugen die mittleren relativen Abweichungen jeweils -20% (RÂČ=0,68) bzw. -25% (RÂČ=0,26). Es wurde argumentiert, dass diese hohen Abweichungen auf eine Kombination sowohl des generisch ausgerichteten Algorithmus als auch der höheren KomplexitĂ€t beider Ökosysteme zurĂŒckgefĂŒhrt werden können. Es zeigte sich außerdem, dass die zeitlichen Aggregierung der FAPAR-Bodendaten zum Vergleich mit S2 FAPAR-Produkt, das sich auf Tagesmittelwerte bezieht, gut ĂŒberlegt sein sollte, da die ÜberschĂ€tzung von FAPAR wĂ€hrend eines hohen Sonnenzenitwinkels in den Bodendaten die Validierungsergebnisse verzerren kann. Unter BerĂŒcksichtigung der Unsicherheiten der Bodendaten erfĂŒllte das S2 FAPAR Produkt jedoch nur am boreale Untersuchungsstandort die Genauigkeitsanforderungen des GCOS. Insgesamt hat sich gezeigt, dass das S2 FAPAR-Produkt bereits gut zur Beurteilung der zeitlichen VariabilitĂ€t von FAPAR geeignet ist, aber aufgrund der geringen Genauigkeit der absoluten Werte sind die Möglichkeiten, globale Produktionseffizienzmodelle zu speisen und globale Kohlenstoffbilanzen zu bewerten, derzeit begrenzt. Die Genauigkeit von satellitengestĂŒtzten FAPAR-Produkten ist abhĂ€ngig von der KomplexitĂ€t des beobachteten Waldökosystems. Die höchste Übereinstimmung zwischen satellitengestĂŒtztem FAPAR und Bodenmessungen, sowohl hinsichtlich der Darstellung von absolutem Werten als auch der rĂ€umlichen VariabilitĂ€t, wurde am borealen Standort erzielt, fĂŒr den die KomplexitĂ€t des Ökosystems unter BerĂŒcksichtigung von Waldstrukturvariablen und Artenreichtum am geringsten ausfĂ€llt. Die dargestellten Ergebnisse wurden in drei Publikationen dieser kumulativen Arbeit erarbeitet. Insgesamt schließt diese Arbeit eine WissenslĂŒcke in der Darstellung des Zusammenspiels verschiedener Umgebungsbedingungen auf die Genauigkeit von situ FAPAR-Messungen. Da die Unsicherheiten von FAPAR nun unter Feldbedingungen quantifizierbar sind, sollten sie in zukĂŒnftigen Validierungsstudien auch berĂŒcksichtigt werden. In diesem Zusammenhang können die in dieser Arbeit genannten praktische Empfehlungen fĂŒr die DurchfĂŒhrung von Bodenbeobachtungen zur Erstellung von Messprotokollen herangezogen werden, die dringend erforderlich sind, um globale satellitengestĂŒtzte FAPAR-Beobachten validieren und zukĂŒnftig verbessern zu können

    Space-Fluid Adaptive Sampling: A Field-Based, Self-organising Approach

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    A recurrent task in coordinated systems is managing (estimating, predicting, or controlling) signals that vary in space, such as distributed sensed data or computation outcomes. Especially in large-scale settings, the problem can be addressed through decentralised and situated computing systems: nodes can locally sense, process, and act upon signals, and coordinate with neighbours to implement collective strategies. Accordingly, in this work we devise distributed coordination strategies for the estimation of a spatial phenomenon through collaborative adaptive sampling. Our design is based on the idea of dynamically partitioning space into regions that compete and grow/shrink to provide accurate aggregate sampling. Such regions hence define a sort of virtualised space that is “fluid”, since its structure adapts in response to pressure forces exerted by the underlying phenomenon. We provide an adaptive sampling algorithm in the field-based coordination framework. Finally, we verify by simulation that the proposed algorithm effectively carries out a spatially adaptive sampling

    THE POLITICAL PROCESS AND GOVERNANCE IN NIGERIA: ROLE OF NATIONAL ASSEMBLY AND INDEPENDENT NATIONAL ELECTORAL COMMISSION, 1999-2018

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    This work evaluates the political process and governance in Nigeria between1999-2018 with emphasis on the role of the National Assembly and Independent National Electoral Commission (INEC). The political process comprises the totality of the ways and means of acquiring and exercising governmental authority in a political system. It is the systematic series of actions and guidelines involving relevant institutions that impact on the quest for the exercise of political power in governmental or public affairs of a country or state through periodic elections. The broad objective of the thesis centered on the evaluation of how the role of the National Assembly and Independent National Electoral Commission could enhance good governance in Nigeria. It employed the survey method of research design in which the data required for the study were generated through the instruments of questionnaire, and in-depth interviews. Quota and stratified sampling techniques were mostly used in the selection of respondents. Four hundred and thirty copies of questionnaire were administered and 360 were returned. The data were analyzed using linear regression analysis, as well as inferential statistics, tables, frequencies, percentages and graphs to crystallize and present the results. The findings among other things indicate that both the National Assembly and Independent National Electoral Commission have not satisfactorily performed their constitutionally assigned roles of enhancing the political process and good governance in Nigeria between 1999-2018; that the National Assembly has not been able to represent the collective interest of the masses; that the inability of the National Assembly to enforce the provisions of the 1999 constitution as they relate to cross-carpeting of politicians elected into the National Assembly or any other elective office in Nigeria is because such an amendment and interpretation will adversely affect the National Assembly members who are currently benefiting from the dispensation; and that although the introduction of technology in the management of elections will help advance the political process in Nigeria, however, due to poor voter education, the huge amount spent for this project would be a colossal national loss except urgent steps are taken by INEC to embark on appropriate voter education to enable the electorates and masses know how the technological equipment are used to facilitate free and fair elections subsequently in Nigeria with a view to advancing democracy in the country

    Genetic diversity and linkage disequilibrium using SNP (KASP) and AFLP markers in a worldwide durum wheat (Triticum turgidum L. Var durum) collection

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    The aim of this work was to analyze the genetic diversity and linkage disequilibrium in a collection of 168 durum wheat accessions (Triticum turgidum L. var. durum) of different origins. Our collection was mainly composed of released and unreleased Argentinian germplasm, with additional genotypes from Italy, Chile, France, CIMMYT, Cyprus, USA and WANA region. To this end, the entire collection was characterized with 85 Single Nucleotide Polymorphism (SNP) markers obtained by Kompetitive Allele Specific PCR (KASP), giving a heterozygosity (He) mean value of 0.183 and a coefficient of genetic differentiation (Gst) value of 0.139. A subset of 119 accessions was characterized with six Amplified Fragment Length Polymorphism (AFLP) primer combinations. A total of 181 polymorphic markers (125 AFLP and 56 SNP) amplified across this subset revealed He measures of 0.352 and 0.182, respectively. Of these, 134 were selected to estimate the genome-wide linkage disequilibrium obtaining low significant values (r2 = 0.11) in the subset, indicating its suitability for future genome-wide association studies (GWAS). The structure analysis conducted in the entire collection with SNP detected two subpopulations. However, the structure analysis conducted with AFLP markers in the subset of 119 accessions proved to have greater degree of resolution and detect six subpopulations. The information provided by both marker types was complementary and showed a strong association between old Argentinian and Italian germplasm and a contribution of CIMMYT germplasm to modern Argentinian, Chilean and Cypriot accessions. The influence of Mediterranean germplasm, mainly from Italy, on part of the modern Argentinian cultivars or breeding lines was also clearly evidenced. Although our analysis yields conclusive results and useful information for association mapping studies, further analyses are needed to refine the number of subpopulations present in the germplasm collection analyzed.Fil: Roncallo, Pablo Federico. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - BahĂ­a Blanca. Centro de Recursos Naturales Renovables de la Zona SemiĂĄrida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona SemiĂĄrida; ArgentinaFil: Beaufort, Valeria. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - BahĂ­a Blanca. Centro de Recursos Naturales Renovables de la Zona SemiĂĄrida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona SemiĂĄrida; ArgentinaFil: Larsen, Adelina Olga. Instituto Nacional de TecnologĂ­a Agropecuaria. Centro Regional Buenos Aires Sur. EstaciĂłn Experimental Agropecuaria Barrow; ArgentinaFil: Dreisigacker, Susanne. Centro Internacional de Mejoramiento de Maiz y Trigo; MĂ©xicoFil: Echenique, Carmen Viviana. Consejo Nacional de Investigaciones CientĂ­ficas y TĂ©cnicas. Centro CientĂ­fico TecnolĂłgico Conicet - BahĂ­a Blanca. Centro de Recursos Naturales Renovables de la Zona SemiĂĄrida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona SemiĂĄrida; Argentin

    Sex trafficking in Nepal: A qualitative study of process and context. Abstract.

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    Thousands of Nepalese girls are trafficked to India and other neighbouring countries every year, primarily for sex work and the majority return to Nepal after spending a years in sex trade. The sub‐group of Nepalese girls who become involved in sex work via trafficking are the focus of this paper. The aim of this study was to increase understanding regarding the context of sex trafficking, the methods and means of trafficking, living conditions in brothels and survival strategies among trafficked girls. We conducted 33 in‐depth interviews in early 2013 with returned trafficking survivors (n=14) and policy‐makers, people working in trafficking related NGOs/INGOs (n=19) in Nepal. All 14 trafficking survivors were recruited in Nepal through the NGO working on trafficking field. The young girls trafficked from Nepal to India in this study were typically unmarried, illiterate and very young (8 to 14 years at the time of trafficking). The key methods of trafficking were false marriage, fake job offer, and abduction. Among the 14 respondents, some had spent one month and others nearly 5 years in Indian brothels. Respondents were either rescued, escaped or released by brothel owners. Four out of 14 were HIV positive. Most policy makers mentioned that poverty, unemployment and illiteracy are the causes behind the trafficking of young girls. The anti‐trafficking interventions need to be considered at a) community level before movement has begun; b) urban centres which are both source and transitory centres for trafficking; c) trafficking level when girls are highly mobile and when they are in brothels; and d) return from trafficking as girls to m ove back into the community

    From Lion to Leaf: The Evacuation of British Children to Canada During the Second World War

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    From Lion to Leaf is a study of the evacuation of British children to Canada in the Second World War. While European refugee children were excluded purposely from Canada, Canadians anxiously called for Britain to send her children as a display of philanthropic, patriotic, imperial, and wartime sentiment. Yet overseas evacuation is often overshadowed, in both the historiography and social memory of the war, by Britain’s domestic evacuation. From Lion to Leaf contributes to the study of evacuation, the British home front, wartime Canada, Canadian childcare and immigration policy, and the changing British Empire. Reflecting the transnationalism of the movement, this study marries governmental sources, newspapers, and personal collections, from both Britain and Canada. To ensure that the child’s perspective of evacuation is revealed, this study utilises extensive collections of evacuees’ wartime letters. Correspondence between British families and Canadian foster families provides a unique window into the familial experience of evacuation. The author’s creation of an evacuee database underpins the study, providing innovative statistics. This study explores governmental negotiations and childcare plans for evacuation, Canadians’ motivations in becoming foster parents, the evacuees’ experiences in Canada, and the lasting implication of evacuation on evacuees’ later lives. This was not a migration whereby Britain asserted its imperial standing and passed unwanted children onto Canada. Rather Canada imposed a special “War Guest” identity onto evacuees. This status in turn shaped evacuees’ experiences within both the public and private spaces. Although separated from family, they gained a cultural education through exposure to Canadian physical, social, and cultural landscapes. Their time spent in Canada became a fundamental part of their childhood, leading some to struggle to reintegrate into British life. Ultimately, Canadian evacuation differed drastically in organisation and facilitation from domestic evacuation. While trauma and abuse form the legacy of domestic evacuation, From Lion to Leaf shows that Canada attempted to provide the best care for its “War Guests”
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