För organisationer som siktar på att bli hållbara är det hävdat att en organisatorisk övergång snarare än en optimering av den nuvarande organisationen är nödvändig (Loorbach & Wijsman, 2013). Detta leder till att när en Cirkulär Ekonomi (CE) modell appliceras och materialflöden sluts innebär det förändringar som påverkar affärsmodeller, logistik, tillhandahålla erbjudanden, service, tillverkning och processer. Företag idag brottas med att applicera CE eftersom det idag saknas en generell bild av hur firmor borde inkludera hållbarhet i sina affärsmodeller, på grund av en brist på kunskap inom fältet (Bocken, Short, Rana, & Evans, 2013). För att kunna röra sig mot en hållbar cirkulär affärsmodell så behöver organisationer övervinna interna barriärer för att genomföra förändringen och hitta transformeringsstrategier för att övervinna dem. Baserat på omfattande litteratur genomfördes elva explorativa djupintervjuer inom ett stort, moget, tillverknings business-to-business företag i Sverige. Företaget har ett intresse av CE men är fortfarande nya på området och har deras affärer baserade på en linjär ekonomi. Den här studien bidrar till att förstå de barriärer som stora mogna organisationer står inför när dom applicerar CE. Studien presenterar en intervju utredning som utforskar ett företags styrkor och svagheter kopplade till deras kapacitet att applicera CE, genom att identifiera barriärer i syfte att kunna använda som en grund för företag att bemöta utmaningarna med en transformation, att ge dom riktningar av var och ge dom riktningar om var och hur dom kan påbörja en transformering. Genom att identifiera barriärer mot en förändring så blir det möjligt att identifiera möjligheter att överkomma dem (Grant, 2010). Studien presenterar sedan områden barriärer befinner sig inom, som författaren anser viktigast, samt förslag på hur man kan bemöta dem. Den här studiens främsta bidrag till forskningen är en detaljerad och övergripande inblick i ett inflytelserikt företags inställning till Cirkulär Ekonomi, samt de barriärer de kan stå inför vid en eventuell övergång. / For organizations that aim to become sustainable, it is argued that an organizational transition is required rather than an optimization of the existing firm (Loorbach & Wijsman, 2013). Hence, applying a Circular Economy (CE) model and closing material loops implies changes that affects business models, logistics, offerings provided, services and manufacturing processes. Companies are currently struggling with applying CE since there is no general view today of how firms should include sustainability into their business models due to a lack of knowledge within the field (Bocken, Short, Rana, & Evans, 2013). In order to move into a sustainable circular business model, organizations needs to overcome internal barriers for performing the change and find transformation strategies for overcoming them. Based on extent literature eleven explorative in-depth interviews were conducted within one large, mature manufacturing business-to-business company in Sweden. The investigated company (hereinafter the Company) has an interest in CE but is still novel in the area and has its businesses based on a linear economy. This paper contributes to understanding the barriers that large mature organizations face when applying CE. The paper presents an interview investigation which explores a company’s strengths and weaknesses based on its capacity to apply CE. The aim is to provide a base for companies to tackle the challenges of transformation, to give them directions of where and how to start. By identifying the barriers of change it becomes possible to identify opportunities to overcome them (Grant, 2010). The study presents areas where barriers are located which the author considers most important, and provide suggestions for how to meet them. The foremost contribution of this study to science is a detailed and all-embracing insight into a powerful company’s attitude to CE, and barriers they might face in a potential transition.

Объектом исследования выступило психологическое благополучие в период зрелости. Предметом исследования стала связь между сочувствием к себе и биографической рефлексией в контексте психологического благополучия в зрелом возрасте Магистерская диссертация состоит из введения, двух глав, заключения, списка литературы (153 источника) и приложения, включающего в себя бланки применявшихся методик и результаты сравнения двух подгрупп внутри выборки для определения ее однородности. Объем магистерской диссертации 123 страницы, на которых размещены 9 рисунков и 14 таблиц. Во введении раскрывается актуальность проблемы исследования, разработанность проблематики, ставятся цель и задачи исследования, определяются объект и предмет исследования, формулируются гипотезы, указываются методы и эмпирическая база, а также этапы проведения исследования, научная новизна, теоретическая и практическая значимость работы. Первая глава включает в себя обзор иностранной и отечественной литературы по теме психологического благополучия и его предикторов биографической рефлексии и сочувствия к себе. Выводы по первой главе представляют собой итоги по изучению теоретического материала. Вторая глава посвящена эмпирической части исследования. В ней представлено описание организации и методов проведенного исследования и результатов, полученных по всем использованным методикам: методика «Шкала психологического благополучия» К. Рифф (адаптация Т.Д. Шевеленковой и П.П. Фесенко); методика «Шкала удовлетворенности жизнью» (SWLS) Э. Динера; оценка уровня развития биографической рефлексии (М.В. Клементьева); опросник сочувствия к себе (К. Нефф); шкала позитивного аффекта и негативного аффекта (ШПАНА) Е. Н. Осина. Также в главе представлен описательный и корреляционный анализ результатов исследования. Выводы по главе 2 включают в себя основные результаты эмпирического исследования. В заключении в обобщенном виде изложены результаты теоретической и эмпирической частей работы, а также выводы по выдвинутым гипотезам, обоснована практическая значимость исследования и описаны возможные перспективы дальнейшей разработки данной проблематики. / The object of the study was psychological well-being in the period of maturity. The subject of the study was the relationship between self-compassion and biographical reflection in the context of psychological well-being in adulthood The master's thesis consists of an introduction, two chapters, a conclusion, a list of references (153 sources) and an appendix, which includes forms of the methods used and the results of comparing two subgroups within the sample to determine its homogeneity. The volume of the master's thesis is 123 pages, which contain 9 figures and 14 tables. The introduction reveals the relevance of the research problem, the elaboration of the problem, sets the purpose and objectives of the study, defines the object and subject of the study, formulates hypotheses, specifies methods and empirical base, as well as the stages of research, scientific novelty, theoretical and practical significance of the work. The first chapter includes a review of foreign and domestic literature on the topic of psychological well-being and its predictors of biographical reflection and self-compassion. The conclusions of the first chapter are the results of the study of theoretical material. The second chapter is devoted to the empirical part of the study. It presents a description of the organization and methods of the research and the results obtained by all the methods used: the methodology «Scale of psychological well-being» by K. Riff (adaptation by T.D. Shevelenkova and P.P. Fesenko); the methodology «Scale of life satisfaction» (SWLS) by E. Diener; assessment of the level of development of biographical reflection (M.V. Klementyeva); self-compassion questionnaire (K. Neff); the scale of positive affect and negative affect (PANAS) by E. N. Osin. The chapter also presents a descriptive and correlation analysis of the results of the study. The conclusions of Chapter 2 include the main results of an empirical study. In conclusion, the results of the theoretical and empirical parts of the work are summarized, as well as conclusions on the hypotheses put forward, the practical significance of the study is substantiated and possible prospects for further development of this problem are described.

Leaf area and stomata are important parameters in studies of taxonomic classification since both parameters might reflect the plant adaptation mechanisms to different environmental conditions. This study analyzed Eurycoma longifolia Jack leaf traits in different ecological regions (moisture zone: A Luoi, Bach Ma, Nam Dong; dry zone: Phong Dien) and leaves of seedlings in the nursery. The study used scanners and Images to measure leaf area; imagej and the AxioVision SE64 softwares were used to evaluate stomatal density by separating the lower cuticle through a clear nail polish impression. Our results showed that the leaf area of mature trees from the dry zone is smaller (355.7 and 484.1 cm2/leaf), however, the stomata density is higher than that of the humid area (284.4 and 137.9 stomata/mm2). Under the same nursery conditions, the seedlings' leaf area was similar while seedlings' stomatal density, originated from the dry zone, was lower. Results indicate that the stomatal density changes as an adaptation to changing habitat conditions. This study gives indicates that E. longifolia is a tree species with high adaptability given the leaf morphology changes under a changing climate. Therefore, this tree species should be a priority for planting in order to increase biodiversity in different ecological regions. / Đặc điểm diện tích lá và mật độ khí khổng là những thông số quan trọng trong các nghiên cứu phân loại học nhằm phản ánh cơ chế thích nghi của thực vật với điều kiện sống. Vì thế nghiên cứu này đã tiến hành phân tích các đặc điểm của lá cây Bách bệnh (Eurycoma longifolia Jack) từ các vùng khác nhau (A Lưới, Bạch Mã, Nam Đông: vùng ẩm và Phong Điền: vùng khô) và lá cây con của chúng ở vườn ươm. Nghiên cứu đã sử dụng máy quét và ImageJ để đo diện tích lá và phần mềm AxioVision SE64 và ImageJ để đánh giá mật độ khí khổng thông qua tách lớp biểu bì phía dưới lá qua lớp sơn mỏng Kết quả nghiên cứu cho thấy, diện tích lá của cây trưởng thành từ vùng khô nhỏ hơn (355.7 and 484.1 cm2/leaf) nhưng mật độ khí khổng lại lớn hơn so với vùng ẩm (284.4 and 137.9 stomata/mm2). Tuy nhiên, cùng điều kiện sống ở vườn ươm, diện tích lá của cây con tương tự nhau trong khi mật độ khí khổng của cây con có nguồn gốc từ vùng khô lại thấp hơn. Kết quả này chỉ ra rằng sự thay đổi của mật độ khí khổng như là một sự thích nghi với thay đổi của điều kiện môi trường sống. Từ đó nghiên cứu này cho thấy cây Bách bệnh là một loài cây gỗ với khả năng thích nghi cao nhờ sự thay đổi về đặc điểm hình thái lá khi thay đổi khí hậu cho nên loài cây này nên được ưu tiên trong việc gây trồng nhằm tăng cường tính đa dạng cho các vùng sinh thái khác nhau.

Mature T-cell leukemias represent rare, but increasingly recognized diseases of which, compared to their B-cell counterparts, comparatively little is established on their pathogenesis, diagnosis, and treatment. These leukemic post-thymic T-cell neoplasms range from the spectrum of chronic, sometimes debilitating disorders such as T-large granular lymphocytic leukemia (T-LGLL), and related leukemias such as NKLGLL, to more aggressive malignancies such as T- prolymphocytic leukemia (T-PLL). In this series, entitled ‘Pathogenesis, Treatment, and Future Directions for Rare T-cell Leukemias’ we review the current state of the science of these important T-cell neoplasms to inform on their treatment, diagnosis, and pathophysiology.

高齡化及少子化的人口結構改變帶來了龐大的銀髮商機，社會總體消費行為以及價值觀亦隨之轉變。惟銀髮市場並非同質性的，其中又以單身女性銀髮族的利基市場最有前景；然而國內鮮少針對特定銀髮族利基市場進行相關的消費者研究。目前對銀髮市場的開發多鎖定現今的銀髮族；然而未來20年將逐漸進入退休生活之40~60歲的族群，平均教育程度及經濟能力較現今的銀髮族為高，思想比上一代開明，加上近年來智慧科技的突飛猛進，其所想望的退休生活勢必與現今的銀髮族大為不同。 因此本研究鎖定此一族群高學歷、高所得、及高資歷的單身熟齡女性進行先驅調查。其思想開明、經濟獨立、可以自由運用時間及金錢、並且願意投資自己，具有很強的消費能力。企藉由了解目標族群的需求與期望，提前開發對應的潛在商機。 本研究先藉由文獻分析，分析目前的總體社會數據、人口結構改變、相關理論模型及市場現況；再採用個別深度訪談法了解每位受訪者的家庭狀況、生活型態、對於退休的想法等等。研究結果顯示受訪者可區隔成四個集群：主流且內向居家的小確幸、心理年輕最願意嘗新的探險家、關心社會注重品質的女鬥士、及控制慾強愛奢侈品的女領導。而受訪者對未來的想望已超越低階的生理及安全需求，而偏向於較高層次的社交、尊重及自我實現需求。 就實際需求面而言，可分成五大層面：健康美麗的緩老需求、安適終老的居住需求、經濟自主的理財需求、教育休閒的娛樂需求、及自我實現的價值需求。根據這五大需求，分別衍生出22項潛在商機，分屬醫療保健、智慧科技、居住交通、金融服務、生活支援及工作休閒等六大構面。 / The changing population structure caused by population aging and low fertility rate has created numerous opportunities for business targeting the elders, which also changes consumer behavior and values in the society. At the moment, the development of silver market mostly focuses on the elders today. However, the forty-to-sixty-year-olds who are going to be retiring in the next twenty years have higher educational background and economic power; moreover, they are more open-minded and have experienced the boost of modern technologies, which gives them much more different expectation for life in retirement than the elders today. Also, the silver market is not homogeneous, and the niche market for single elder women has the brightest prospect. Nevertheless, there is barely any consumer research for the elder niche markets in Taiwan. Therefore, this pioneer research targets at single mature females with high educational level, high income, and high qualifications. They are open-minded, financially independent, able to use their time freely, willing to invest in themselves; above all, they have strong consuming capacity. Through exploration of the expectation and demand of the target customers, the potential business opportunities can be uncovered. The research starts with literature review, analyzing the current social data, the change of population structure, relevant theoretical models, and the current market conditions. Then it adopts the method of individual in-depth interview to understand the family condition, life style, and ideas about retirement of every interviewee. The result of the research shows that the interviewees could be divided into four clusters: the small happiness holders with introverted housebound disposition, the adventurers who stay mentally young and love to try something new, the fighters who care about the society and life quality, and the leaders who love luxuries and to control everything. The interviewees’ expectations of future have already overpassed the most fundamental levels of needs: physiological and safety needs, and are inclined to higher levels needs: social, self-esteem, and self-actualization needs. There are five aspects regarding the practical demands: the ways to slow aging and keep health and beauty, a nice shelter to enjoy the comfortable retirement life, the finance-management to be financially independent, education and entertainment, and the chances of self-actualization. Twenty-two potential business opportunities can be derived from these demands, which respectively belong to the following six categories: medical and health care, intelligence technology, housing and transportation, financial service, living support, and work and entertainment.

The mature market presents challenges to marketers because much of the information about the marketplace is based on younger consumers, differing from older consumers in many important ways. The research project was commisioned with two main objectives: to determine what is required to cater for customers falling into the age bracket of 60-75, enabling marketers to successfully target the mature consumer and retain these customers. A qualitative methodology was selected to collect and analyse information to enhance understanding of the perceptions with regard to the functional, social and emotional needs of the mature market sector. Abraham Maslow is known for postulating the 'Hierarchy of Needs Theory', stating that human beings are motivated by their unsatisfied needs. It is necessary to understand and investigate the relative importance of the functional, emotional and actualisation components of mature consumer needs. / Thesis (M.A. (Psychology ))

<p>This thesis investigates the way to implement a valuable e-commerce solution. With the growing importance of information technologies in business practices, more and more companies are adopting e-commerce as a selling and ordering process. However, depending on the market environment, the level of success of the implementation may differ. The purpose of this study is therefore to examine what are the conditions required for a successful B2B e-commerce implementation in different market contexts.</p><p>Theories related to the impact of markets' contexts on e-commerce, the business process, and the drivers and enablers of e-commerce have been considered. Thereafter the current situation of Star Laundry Solutions (SLS) has been studied. The context of different markets – France, United Kingdom, Turkey - where they have dealers, the business process drivers of implementations and success factors of a valuable e-commerce solution have been investigated. The result of the empirical studied are analyzed in comparison with the theoretical findings. Through this method, the main research question of the thesis, namely “What are the necessary conditions to implement a value-adding e-commerce solution in different market contexts?” can be answered.</p><p>Several conditions have been identified in order to succeed the implementation and bring value to the different players along the supply chain, from the manufacturer to the end-customer. The market should first answer different criteria. Further, future users of the web solution must support the implementation, trust between parties must also emerge from the implementation, and additional information must be provided on the website such as product numbers (PNCs), products' availability and delivery times.</p><p>The provided recommendations of this thesis regarding the features of the web solution, the range of products that dealers and importers should be able to order online and the range of companies that should be allowed to use the web solution in Turkey.</p>

The mature market presents challenges to marketers because much of the information about the marketplace is based on younger consumers, differing from older consumers in many important ways. The research project was commisioned with two main objectives: to determine what is required to cater for customers falling into the age bracket of 60-75, enabling marketers to successfully target the mature consumer and retain these customers. A qualitative methodology was selected to collect and analyse information to enhance understanding of the perceptions with regard to the functional, social and emotional needs of the mature market sector. Abraham Maslow is known for postulating the 'Hierarchy of Needs Theory', stating that human beings are motivated by their unsatisfied needs. It is necessary to understand and investigate the relative importance of the functional, emotional and actualisation components of mature consumer needs. / Thesis (M.A. (Psychology ))

Mature industries have played and still play a crucial role in national and world economies. To survive and retain competitiveness, they need to innovate, as innovation is the driver of economics growth and industrial transformation. However, existing research does not provide sufficient explanation of how innovation in mature industries can be enabled based on resources and internal development logic of those industries, i.e. endogenously. Some previous studies focused on incremental innovation patterns, which led to an underestimation of innovation potential of mature industries. Other studies acknowledged a high innovation potential of mature industries, but failed to explain how, through what mechanisms, industry-endogenous logic can bring about major innovations. Therefore, the purpose of this thesis is to systematically address, explain and conceptualize endogenous industry- innovation and its driving mechanisms in mature industries. To achieve this purpose, three main issues are addressed. First, the thesis investigates and conceptualizes the notion of industry endogenous innovation mechanisms based on the path dependency theory. Second, the thesis addresses strategic choices and actions by established companies that are rooted in the industry endogenous mechanisms and result in highly innovative outcomes. Third, the thesis systematically analyses different aspects of radicalness of innovations resulting from industry endogenous mechanisms. The thesis represents a qualitative, embedded case study with two main industry cases, i.e. the global lighting industry and the Swedish pulp and paper industry. The lighting industry and its sub-cases in the form of specific lighting technologies have been studied via the analysis of patents of leading lighting manufacturers, archival and secondary data sources as well as interviews with different types of actors in the industry. The pulp and paper industry and its sub-cases in the form of innovation initiatives have been studied with the help of interviews with leading manufacturers and research institutes, as well the analysis of annual reports and secondary data sources. The outcomes of the study are presented in the form of the thesis cover paper and five appended papers. The results show that innovations of any magnitude can be endogenously developed in mature industries. At the industry level, endogenous innovation is driven by innovation mechanisms that can be conceptualized as reactive sequences and self-reinforcing mechanisms. At the level of individual companies, the exploitation strategy corresponds to the logic of endogenous innovation mechanisms by enabling highly innovative outcomes and building on a wide range of resources available in the industry. The endogenous character of innovation mechanisms imposes certain limitations on the radicalness of the outcomes in the form of trade-offs in terms of how many and what particular aspects can be radically new at once. With these results, the thesis contributes to a more balanced overall understanding of innovation potential of mature industries and allows shifting the focus of discussion from whether mature industries can develop radical innovation to when and under what conditions they can succeed in this process. The results of the thesis also suggest several recommendations for managers in established companies with regard to how they can they can take advantage of industry endogenous innovation mechanisms. / Mogna branscher har traditionellt sett spelat och spelar fortfarande en viktig roll för såväl nationella ekonomier som för världsekonomin. För att överleva och behålla sin konkurrenskraft behöver mogna branscher fortsätta vara innovativa, eftersom innovation driver ekonomisk tillväxt. Även för enskilda, etablerade företag i sådana branscher är innovation centralt – de företag som inte lyckas med innovation riskerar att förlora i konkurrensen och bli ersatta av andra. Det finns emellertid än så länge inte någon bra förklaring till hur innovation i mogna branscher kan möjliggöras endogent, d v s baserat på befintliga resurser och branschens interna utvecklingslogik. Tidigare studier har antingen tenderat att underskatta innovationspotentialen i mogna branscher eller misslyckats med att visa hur – d v s genom vilka mekanismer – branschens egen logik kan möjliggöra radikala innovationer. Syftet med denna avhandling är att förklara och konceptualisera endogena innovation och dess drivmekanismer i mogna branscher. För att uppnå detta syfte undersöker avhandlingen endogena innovationsprocesser på såväl bransch- som företagsnivå samt analyserar i vilken utsträckning olika aspekter av radikala innovationer möjliggörs av endogena mekanismer. Avhandlingen är baserad på kvalitativa fallstudier av två branscher. Den första branschen är den globala belysningsindustrin, där olika belysningstekniker har studerats via analyser av patent, sekundära datakällor samt intervjuer med olika typer av aktörer i branschen. Den andra branschen är svensk pappersmassaindustri, där ett antal olika innovationsinitiativ har studerats framförallt med hjälp av intervjuer med ledande företag och forskningsinstitut. Avhandlingen består av en kappa och fem bifogade artiklar. Resultaten visar att alla typer av innovationer, inklusive radikala innovationer, kan utvecklas endogent i mogna branscher. På industrinivån drivs denna utveckling av innovationsmekanismer i form av reaktiva sekvenser och självförstärkande mekanismer. På företagsnivån kan processen drivas av en innovationsstrategi som bygger på exploatering av befintliga resurser. Trots att alla aspekter av radikala innovationer kan utvecklas endogent, medför endogena mekanismer emellertid vissa begränsningar i form av kritiska avvägningar när det gäller hur många och vilka aspekter som kan hållas radikala samtidigt. Med dessa resultat bidrar avhandlingen till en mer balanserad, övergripande förståelse för innovationspotentialen i mogna branscher och medger ett skifte av fokus i vetenskapliga diskussioner från frågan om mogna branscher kan utveckla radikala innovationer till när och under vilka villkor de kan lyckas med denna process. I avhandlingen ges även rekommendationer för ledare i etablerade företag med avseende på hur de kan dra nytta av branschens endogena innovationsmekanismer.

La fragmentation des habitats ainsi que la réduction de leur disponibilité sont des menaces importantes pour les écosystèmes, notamment aquatiques. La disponibilité et la qualité des sites de fraie du saumon Atlantique peut donc être limitante dans certaines rivières. Après la migration en rivière, les femelles saumon vont chercher à s'établir dans un des sites de fraie disponibles. La distribution spatiale des femelles va alors influer sur la distribution spatiale des mâles reproducteurs qui vont chercher soit à monopoliser plusieurs femelles (pour les mâles dominants), soit à les approcher en adoptant un comportement "furtif" (pour les mâles satellites). L'accès des mâles aux femelles va donc dépendre de la distribution spatiale des femelles et des déplacements des mâles dans la rivière. La distribution des femelles va également jouer sur la distribution spatiale des juvéniles, les concentrant à certains endroits. Cette concentration peut augmenter la mortalité densité-dépendante qui modifie la dynamique de la population. Cette thèse avait pour but d'évaluer comment l'utilisation de l'espace des potentiels reproducteurs, c'est à dire les individus matures, influence la dynamique de la population et la sélection sexuelle.Des séries temporelles de stock (oeufs déposés) et de recrutement (juvéniles) pour la population de saumon de la Nivelle ont été associées à des mesures de l'agrégation spatiale des nids creusés par les femelles. L'effet des déplacements et de la distribution des reproducteurs sur leur participation à la reproduction a notamment été testé via la reconstruction du réseau d'interactions sexuelles dans la Nivelle.J'ai ainsi démontré que l'agrégation spatiale des nids influa sur la variabilité du recrutement mais pas sur le recrutement moyen. Cette agrégation qui résulte de l'agrégation des femelles a également été liée au nombre de reproducteurs ayant engendrés des juvéniles. Le réseau d'interactions sexuelles a permis de mettre en évidence une structure sociale locale au sein de la population. Cette structure et les compétiteurs présents pouvaient par exemple diminuer le succès reproducteur des mâles. Notamment, les tacons matures qui participent à la reproduction avant de migrer en mer renforçaient la compétition sexuelle dont les mâles dominants faisaient l'objet. Enfin, ces mêmes tacons matures adoptèrent des comportements spatiaux du fait de leur statut de maturité avec des individus bougeant peu et des individus se déplaçant vers l'amont. Ces comportements spatiaux influaient leur participation à la reproduction, l'étendue des domaines de vie et les déplacements vers l'amont augmentaient la probabilité de rencontrer une femelle.Mes résultats m'ont permis de mettre en évidence l'effet de l'utilisation de l'espace des potentiels reproducteurs sur la dynamique de la population et sur la sélection sexuelle. Ainsi, en combinant différentes échelles spatiales et temporelles il a été montré que l'agrégation des femelles pouvait être bénéfique pour la dynamique de la population. Il semble que les femelles tendent à s'agréger d'abord sur les meilleurs sites de fraie avec une plus forte stabilité environnementale. Cette distribution des femelles affecta la capacité des mâles à monopoliser plusieurs femelles, une agrégation modérée permettant une monopolisation. La participation des mâles furtifs anadromes ou tacons matures était également dépendante de l'agrégation des femelles. Il apparait que la disponibilité d'habitats adéquats pour la reproduction semble limitante dans la Nivelle et notamment du fait de la présence de barrages. Ce manque semble affecter le système d'appariement de la population et la sélection sexuelle y opérant. Des mesures visant à améliorer la qualité des sites de fraie déjà disponibles ainsi que leur accessibilité pourraient être envisagées. / Habitat fragmentation and reduction in the availability of suitable habitats are significant threats to ecosystems in particularly for freshwater ones. For instance, accessibility, availability, and quality of breeding sites of Atlantic salmon, \textit{Salmo salar}, can be restricting in some rivers due to human activities and dams. Such threats may affect distribution of potential breeders because after their up-river migration, salmon females distribute within available breeding sites. Spatial distribution of females determines the spatial distribution of breeder males. Dominant males try to monopolise several females, whereas subordinate males adopt a sneaky behaviour. Access to females by males depends on the spatial distribution of females and on males' displacements within a river. The spatial distribution of females generates the spatial distribution of juveniles, aggregating them at some breeding sites. The latter aggregation of juveniles may raise the density-dependent mortality with potential consequences on population dynamics. The thesis aims to assess how space use of potential breeders, namely mature individuals able to spawn or fertilise eggs, influence population dynamics and sexual selection.I combined different approaches and different temporal and spatial scales to potential effects of space use of potential breeders. Time series of stock (deposited eggs) and of recruitment (juveniles) for the salmon population of the Nivelle River were combined with measures of spatial aggregation of nests. The effects of displacements and spatial distribution of potential breeders on their participation in reproduction were tested through inferring the sexual network of the population.I found that spatial aggregation of nests improved the recruitment variability but did not affect the average recruitment. The spatial aggregation of nests resulting from female aggregation was also linked to the number of effective breeders through a U-shaped curve. Such relationships suggested mate monopolization dependent on the spatial aggregation of females. The negative effect of the spatial isolation of females on their number of mates also suggest such mate monopolization. Then, the inferred sexual network enabled me to highlight a local social structure within the population. The latter structure and social competitors impacted the reproductive success of anadromous males. The participation of mature parr was one of the factors diminishing the sexual competition faced by anadromous males. Finally, mature parr were more mobile and moved more upstream than immature parr. Spatial behaviours of mature parr were linked to their participation in reproduction, individuals exhibiting wider home ranges had a higher probability to encounter females.Altogether my results show that space use of potential breeders affect both population dynamics and sexual selection. Then, spatial aggregation of females and of their nests can be beneficial for population dynamics as shown by combining different temporal and spatial scales. Females seemed to aggregate within the best breeding sites with a better environmental stability. The spatial distribution of females affected the ability of males to monopolise several females and participation of sneaky males. The availability of suitable good breeding habitats seemed restricting in the Nivelle, potentially due to the presence of impassable upstream dams. The lack of suitable breeding sites seemed impacting the mating system of the population and the sexual selection operating in. Some management actions to improve the quality of breeding sites and their availability could be planned.