Academic literature on the topic 'Migratory path'

Successful bird migration can depend on individual learning, social learning, and innate navigation programs. Using 8 years of data on migrating whooping cranes, we were able to partition genetic and socially learned aspects of migration. Specifically, we analyzed data from a reintroduced population wherein all birds were captive bred and artificially trained by ultralight aircraft on their first lifetime migration. For subsequent migrations, in which birds fly individually or in groups but without ultralight escort, we found evidence of long-term social learning, but no effect of genetic relatedness on migratory performance. Social learning from older birds reduced deviations from a straight-line path, with 7 years of experience yielding a 38% improvement in migratory accuracy.

The population dynamics and fishery policy for a migratory resource with two migration paths are analyzed, based on the supposition that the resource separates into two groups, each migrating along and caught on a different path, after reproduction in a limited area. Two possible mechanisms determining individual migration paths are considered: (i) ``nongenetically controlled'' migration and (ii) ``genetically controlled'' migration. Initially, the relationships between the resource population dynamics and the fishery are analyzed for both these cases. Based on these results, the optimal fishery policy for each migration path is analyzed. Two criteria to be maximized were considered: (i) the ``game situation,'' which aims to maximize catches on each fishery path, and (ii) the ``cooperative situation,'' which aims to maximize the total, overall catch on both paths. In the case of genetically controlled migration, a fishery based on one path negatively affects recruitment on that path but positively affects recruitment on the alternative path. In both the nongenetically controlled and genetically controlled migration cases, the cooperative policy resulted in higher overall maximum catch, especially in the latter case. In the genetically controlled migration case, convergence to equilibrium is often slow, the rate being affected by density dependence of mortalities.

Abstract The development of vertebrate definitive hematopoiesis is featured by temporally and spatially dynamic distribution of hematopoietic stem/progenitor cells (HSPCs). It is proposed that the migration of definitive HSPCs, at least in part, accounts for this unique characteristic; however, compelling in vivo lineage evidence is still lacking. Here we present an in vivo analysis to delineate the migration route of definitive HSPCs in the early zebrafish embryo. Cell-marking analysis was able to first map definitive HSPCs to the ventral wall of dorsal aorta (DA). These cells were subsequently found to migrate to a previously unappreciated organ, posterior blood island (PBI), located between the caudal artery and caudal vein, and finally populate the kidney, the adult hematopoietic organ. These findings demonstrate that the PBI acts as an intermediate hematopoietic organ in a manner analogous to the mammalian fetal liver to sustain definitive hematopoiesis before adult kidney hematopoiesis occurs. Thus our study unambiguously documents the in vivo trafficking of definitive HSPCs among developmentally successive hematopoietic compartments and underscores the ontogenic conservation of definitive hematopoiesis between zebrafish and mammals.

Neural crest cells are conventionally believed to migrate arbitrarily into various pathways and to differentiate according to the environmental cues that they encounter. We present data consistent with the notion that melanocytes are directed, by virtue of their phenotype, into the dorsolateral path, whereas other neural crest derivatives are excluded. In the avian embryo, trunk neural crest cells that migrate ventrally differentiate largely into neurons and glial cells of the peripheral nervous system. Neural crest cells that migrate into the dorsolateral path become melanocytes, the pigment cells of the skin. Neural crest cells destined for the dorsolateral path are delayed in their migration until at least 24 hours after migration commences ventrally. Previous studies have suggested that invasion into the dorsolateral path is dependent upon a change in the migratory environment. A complementary possibility is that as neural crest cells differentiate into melanocytes they acquire the ability to take this pathway. When quail neural crest cells that have been grown in culture for 12 hours are labeled with Fluoro-gold and then grafted into the early migratory pathway at the thoracic level, they migrate only ventrally and are coincident with the host neural crest. When fully differentiated melanocytes (96 hours old) are back-grafted under identical conditions, however, they enter the dorsolateral path and invade the ectoderm at least one day prior to the host neural crest. Likewise, neural crest cells that have been cultured for at least 20 hours and are enriched in melanoblasts immediately migrate in the dorsolateral path, in addition to the ventral path, when back-grafted into the thoracic level. A population of neural crest cells depleted of melanoblasts--crest cells derived from the branchial arches--are not able to invade the dorsolateral path, suggesting that only pigment cells or their precursors are able to take this migratory route. These results suggest that as neural crest cells differentiate into melanocytes they can exploit the dorsolateral path immediately. Even when 12-hour crest cells are grafted into stage 19–21 embryos at an axial level where host crest are invading the dorsolateral path, these young neural crest cells do not migrate dorsolaterally. Conversely, melanoblasts or melanocytes grafted under the same circumstances are found in the ectoderm. These latter results suggest that during normal development neural crest cells must be specified, if not already beginning to differentiate, as melanocytes in order to take this path.(ABSTRACT TRUNCATED AT 400 WORDS)

This paper presents a dynamic path planning method based on improved ant colony algorithm. In order to increasing the algorithm’s convergence speed and avoiding to fall into local optimum, we propose adaptive migratory probability function and updating the pheromone. We apply the improved algorithm to path planning for mobile robot and the simulation experiment proved that improved algorithm is viable and efficient.

Through compilation of historical whaling data, together with recent aerial and boat-based survey data, a general framework for the overall peaks of migration has been estimated for the temporal and spatial movements of Group IV humpback whales along the Western Australian coast.The migratory paths of humpback whales along the Western Australian coast lie within the continental shelf boundary or 200 m bathymetry. Major resting areas along the migratory path have been identified at Exmouth Gulf (southern migration only) and at Shark Bay. The northern endpoint of migration and resting area for reproductively active whales in the population appears to be Camden Sound in the Kimberley. A 6,750 square km2 area of the Kimberley region, inclusive of Camden Sound, has also been identified as a major calving ground. The northern and southern migratory paths have been shown to be divergent at the Perth Basin, Dampier Archipelago and Kimberley regions. In all cases the northern migratory route is further off-shore.

Raptor migration is complex phenomenon of migration which involving of millions of individual birds flying hundreds or thousands kilometers, between breeding habitat and wintering habitat. Migratory behavior consisted of period, route, and other aspects that affect the ecology of migratory birds. Pernis ptylorhynchus, Oriental honey-buzzard (OHB) is one of migratory raptors which have satellite tracked by ARGOS since 2003. Eastern part of Flores Islands consisted of small islands (23 islands) were identified as OHB’s migratory path to reach their wintering habitats in Kupang and Timor Island. This study has aimed to identify and analyze the OHB’s migratory behavior in Eastern part of Flores Islands. Four individuals OHB have satellite tracked in the period of 2007-2012 were used as main data for analyzing their migratory behavior. There was no particular pattern found on the way of OHBs selected islands for their stopover site because of the existence of small islands cluster provide variety of route for each OHBs. The length of their stay found relatively constant every year and tend to be stay longer on larger islands than the smaller one such as Flores Island and Lembata Island. This is apparently due to the larger islands provide more food supply than smaller islands.

In the last 15 years, the west population of white-naped crane (Antigone vipio) decreased dramatically despite the enhanced conservation actions in both breeding and wintering areas. Recent studies highlighted the importance of protecting the integrity of movement connectivity for migratory birds. Widespread and rapid landcover changes may exceed the adaptive capacity of migrants, leading to the collapse of migratory networks. In this study, using satellite tracking data, we modeled and characterized the migration routes of the white-naped crane at three spatial levels (core area, migratory corridor, and migratory path) based on the utilization distribution for two eras (1990s and 2010s) spanning 20 years. Our analysis demonstrated that the white-naped crane shifted its migratory route, which is supported by other lines of evidences. The widespread loss of wetlands, especially within the stopover sites, might have caused this behavioral adaptation. Moreover, our analysis indicated that the long-term sustainability of the new route is untested and likely to be questionable. Therefore, directing conservation effects to the new route might be insufficient for the long-term wellbeing of this threatened crane and large-scale wetland restorations in Bohai Bay, a critical stopover site in the East Asian-Australasian flyway, are of the utmost importance to the conservation of this species.

Master of Science<br>Department of Biology<br>Alice Boyle<br>Species extinctions over the past two centuries have mainly been caused by habitat destruction. Landscape change typically reduces habitat area, and can fragment contiguous habitat into remnant patches that are more subject to anthropogenic disturbance. Furthermore, changes in the landscape matrix and land-use intensification within remaining natural areas can reduce habitat quality and exacerbate the consequences of habitat loss and fragmentation. Accordingly, wildlife conservation requires an understanding of how landscape structure influences habitat selection. However, most studies of habitat selection are conducted at fine spatial scales and fail to account for landscape context. Temperate grasslands are a critically endangered biome, and remaining prairies are threatened by woody encroachment and disruptions to historic fire-grazing regimes. Here, I investigated the effects of habitat area, fragmentation, woody cover, and rangeland management on habitat selection by two species of declining grassland-obligate sparrows: Henslow’s Sparrows (Ammodramus henslowii) and Grasshopper Sparrows (A. savannarum). I conducted >10,000 bird surveys at sites located throughout eastern Kansas, home to North America’s largest remaining tracts of tallgrass prairie, during the breeding seasons of 2015 and 2016. I assessed the relative importance of different landscape attributes in determining occurrence and within-season site-fidelity of Henslow’s Sparrows using dynamic occupancy models. The species was rare, inhabited <1% of sites, and appeared and disappeared from sites within and between seasons. Henslow’s Sparrows only settled in unburned prairie early in spring, but later in the season, inhabited burned areas and responded to landscape structure at larger scales (50-ha area early in spring vs. 200-ha during mid-season). Sparrows usually settled in unfragmented prairie, strongly favored Conservation Reserve Program (CRP) fields embedded within rangeland, avoided trees, and disappeared from hayfields after mowing. Having identified fragmentation as an important determinant of Henslow’s Sparrow occurrence, I used N-mixture models to test whether abundance of the more common Grasshopper Sparrow was driven by total habitat area or core habitat area (i.e. grasslands >60 m from woodlands, croplands, or urbanized areas). Among 50-ha landscapes containing the same total grassland area, sparrows favored landscapes with more core habitat, and like Henslow’s Sparrows, avoided trees; in landscapes containing ~50–70% grassland, abundance decreased more than threefold if half the grassland area was near an edge, and the landscape contained trees. Effective conservation requires ensuring that habitat is suitable at spatial scales larger than that of the territory or home range. Protecting prairie remnants from agricultural conversion and woody encroachment, promoting CRP enrollment, and maintaining portions of undisturbed prairie in working rangelands each year are critical to protecting threatened grassland species. Both Henslow’s Sparrows and Grasshopper Sparrows were influenced by habitat fragmentation, underscoring the importance of landscape features in driving habitat selection by migratory birds. As habitat loss threatens animal populations worldwide, conservation efforts focused on protecting and restoring core habitat could help mitigate declines of sensitive species.

Alors que les discours se sont multipliés ces dernières années sur la désaffection des paysans envers l'arachide, un nouveau processus de colonisation agricole vient rappeler le lien fondamental qui les unit à cette culture. Construite patiemment, leur identité arachidière ne perd pas de sa substance, seul son expression change. Au début des années 1980, la saturation foncière enregistrée au Saloum, la sécheresse, etc. , ont déterminé des milliers de Saloum-Saloum à prendre le chemin de la forêt classée de Pata. Avec la complicité de l'Etat et de certains autochtones, le processus s'est poursuivi au fil des années. Toutefois, la "course foncière" a été marquée par des conflits entre autochtones et migrants et entre migrants : "celui qui a faim se soucie peu de la manière de manger" disent ces derniers. Avec leur implantation dans la forêt de Pata, ils investissent en permanence un espace désormais élargi, l'espace migratoire : "celui qui ne marche pas ne fera rien marcher" aiment-ils à rappeler<br>Whereas the speeches multiplied these last years on the disaffection of the peasants towards groundnut, a new process of agricultural colonization comes to point out the fundamental bond which links them with this culture. Built patiently, their "groundnut identity" does not lose its substance, only its place of expression changes. At the beginning of the years 1980, the land saturation recorded in Saloum, the dryness, etc. , determined thousands of Saloum-Saloum to take the way of the protected forest of Pata. With the complicity of the state and some autochtones, the process continued with the passing of years. However, the land race was marked by conflicts between autochtones and migrants and migrants: that which is hungry troubles little about the manner of eating say the latter. With their establishment in the forest, they permanently invest a widened space from now on, migratory space; that which does not go will not do anything to go, like to recall

Cette thèse interroge les dynamiques de construction du rapport à la politique (intérêt, critique, indifférence, engagement etc.) des descendants d’immigrés nés en France – ou y ayant grandi – et résidant dans un quartier d'habitat social dans lequel est mise en oeuvre la politique de la ville. L'originalité de ce travail vient du fait que différents rapports à la politique sont étudiés et que les familles rencontrées sont originaires de différents pays (Sénégal, Algérie, Maroc, Vietnam, Laos, Comores etc.). L'analyse développée à partir d’entretiens biographiques souligne l’influence des différents parcours migratoires des parents et des expériences communes des enfants sur la construction de leurs attitudes politiques ; elle questionne leur éventuelle spécificité. Elle accorde une attention particulière à la mémoire familiale et aux dynamiques des transmissions intergénérationnelles, aux trajectoires socioprofessionnelles des descendants d’immigrés et de leurs parents ainsi qu’au contexte local de vie<br>This PhD questions the dynamics of political attitudes (interest, criticism, indifference, involvement etc.) of French youths from non-European immigrant background born or raised in France in deprived areas where a specific policy is implemented. The originality of this study is that it includes different attitudes towards politics and different countries of origin. The interlocutors interviewed are from Senegal, Algeria, Morocco, Vietnam, Laos, Comoros etc. The analysis developed from biographical interviews underlines the influence of the different migration paths of the parents, and the common experiences of their children on the construction of their political attitudes; it questions their possible specificity. This analysis pays particular attention to the family memory and the dynamics of intergenerational transmission, to the socio-professional trajectories of immigrants’ descendants and those of their parents as well as their local context of residence

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>As tartarugas marinhas são espécies ameaçadas, altamente migratórias que apresentam um ciclo de vida longo e uma ampla distribuição geográfica. Assim, melhorar a nossa compreensão sobre a ecologia espacial das tartarugas marinhas é essencial para a elucidação de aspectos da sua história de vida e para o desenvolvimento de medidas eficazes de conservação. Esta tese compreende um conjunto de artigos ou capítulos que visam contribuir ao conhecimento da ecologia espacial da tartaruga-de-couro, Dermochelys coriacea. Este estudo utilizou novas tecnologias como à telemetria por satélite (que proporciona um método útil para monitorar os movimentos de espécies migratórias) e um conjunto de ferramentas de geoprocessamento como abordagem metodológica que visou: examinar os movimentos e migrações da tartaruga-de-couro, identificar áreas de uso intenso e padrões espaço-temporais no uso do habitat, e integrar dados biológicos e oceanográficos para descrever as estratégias comportamentais desta espécie. Cinco tartarugas-de-couro (um subaduto, dois machos adultos e duas fêmeas adultas) foram equipadas com transmissores por satélite no Atlântico Sul Ocidental entre 2005 e 2008. Além de fornecer dados de localização geográfica os tansmissores permitiram registrar informações de mergulho tais como profundidade e duração máxima e media dos mergulhos, perfis completos de mergulhos individuais e dados de temperatura do mar. Movimentos e migrações de tartarugas-de-couro marcadas no Atlântico Sul foram documentados pela primeira vez. Alem disso, foi posível identificar áreas de uso intenso (ou alimentação) previamente desconhecidas para a espécie, assim como uma residência sazonal nestas áreas localizadas em águas tropicais e temperadas fora da costa sul-americana (19-45S). A sazonalidade dos movimentos esteve intimamente associada a processos físicos sazonais de pequena e mesoescala. Dependendo do ambiente marinho explorado, durante os períodos de residência, as tartarugas apresentaram diferentes estratégias alimentares identificadas através da análise dos padrões de mergulho.<br>Sea turtles are long-lived, highly migratory endangered species with a wide distribution. Thus improving our knowledge of the spatial ecology of sea turtles is essential for elucidating aspects of their life history and for the development of effective conservation measures. This thesis comprises a collection of articles or chapters that aim to contribute to the knowledge of the spatial ecology of the leatherback turtle, Dermochelys coriacea. This study used new technologies such as satellite telemetry (which provides a useful approach for tracking the movements of migratory species) and a set of geoprocessing tools as a methodological approach that aimed to: examine the movements and migrations of leatherback turtles, identify high use areas and spatio-temporal patterns of habitat use, and integrate biological and environmental data to describe foraging strategies of this species. Five leatherback turtles (a subadut, two adult males and two adult females) were fitted with satellite transmitters in the Southwest Atlantic between 2005 and 2008. Besides providing geographical location data the transmitters also recorded dive information such as mean and maximum dive depth and duration, individual dive profiles and water temperature data. For the first time the movements and migrations of leatherback turtles tagged in the South Atlantic were documented. Previously unidentified high use areas (or foraging areas) were recognized for this species, also a seasonal residence along those areas located in tropical and temperate areas off the coast of South America (19-45 S). The seasonal movements were closely associated with small and mesoscale physical seasonal processes. Depending on the marine environment exploited during periods of residence, the turtles showed different foraging strategies identified through the analysis of the diving patterns.

Cette recherche transdisciplinaire démontre qu’à partir d’un travail sur les biographies langagières, nous pouvons nous ouvrir sur une nouvelle approche méthodologique en direction des publics migrants adultes. Elle a pour visée l’expérimentation concrète, d’une didactique du plurilinguisme à visée d’intégration sociale par la mise en lumière de l’articulation autour des publics migrants, d’une variété d’enjeux : didactiques, institutionnels, sociaux, politiques et personnels.L’enjeu de ce travail sera donc de développer la dimension biographique afin de développer une approche méthodologique à destination des publics migrants adultes.Pour cela, il a fallu dans le premier volet, expliciter la contextualisation institutionnelle et didactique de la situation d’intervention en milieu associatif, les principales caractéristiques du public-cible visé qui servent de point d’appui dans cette recherche intervention et formation afin d’appréhender le migrant dès son arrivée en France.Alors que dans le second volet, nous mettons en exergue à travers quelques exemples de trajectoires migratoires englobant l’ensemble des parcours du migrant (scolaires, sociaux, langagiers, culturels…), les enjeux socio-didactiques et culturels de cette approche méthodologique de recherche et d’enseignement-apprentissage.En définitive, nous axons notre travail sur les moyens d’articulation entre les différents savoirs expérientiels de vie, ou de compétences professionnelles ou conventionnelles, par le biais d’approches biographiques qui sont extensibles, recouvrant à la fois un espace multiforme et transdisciplinaire, et une temporalité historique, tout en étant très contemporaine<br>This research has convened two disciplinary fields sociolinguistics and didactics in order to demonstrate that from a work on the language biography, we can open a new methodological approach in the direction of the adult migrant audiences. This research is aiming the concrete experimentation of didactics of plurilingualism to aim a social integration.This work deals with the meeting of adult migrants in associations with the e biography language through case studies of social integration. The challenge of this work will be to develop the biographic dimension, i.e. from known facts of the lives of our audience to take it audience into unknown territory, potentially least safe in order to develop a methodological approach to destination of migrants adults through the studies 'of some social integration cases.This, il will be necessary to multiply the application in different biographical approaches such as the contextualized portfolio class, which allow the migrant adult to progress in his learning, and to acquire basic knowledge in everyday life and especially to target successful social integrationAfter a presentation of the conceptual and institutional framework for this work, in order to better convey the educational issues of the field of the intervention, we explain through examples, socio- educational and cultural issues of this methodological approach and teaching-learning issues

La présente recherche s’intéresse au parcours migratoire entre le Mexique et le Canada de demandeurs d’asile mexicains déboutés. Privés des droits et des libertés fondamentales conférés par la citoyenneté, les Mexicains vivent dans un espace-temps constrictif et détiennent un accès limité à la mobilité. Victimes des déroutes et de la défaillance du système socioéconomique et politique du Mexique, l’asile devient bien souvent l’unique option à leur survie. Une fois au Canada, les demandeurs d’asile mexicains sont percutés dû à la prédominance de la criminalisation de l’asile et au discours stigmatisant de la figure du demandeur d’asile qui encouragent un flux considérable de migrations de retour forcé. Dépossédés du droit de choisir là où ils veulent vivre, les demandeurs d’asile mexicains font face à une double exclusion de l’espace. En ce sens, cette recherche explore le parcours migratoire des demandeurs d’asile mexicains à travers le vécu et l’imaginaire migratoire qui l’entourent. Elle tente de saisir les raisons qui motivent la migration et les éléments à l’origine de la modulation et de la transformation de la quête migratoire initiale. Ainsi, elle cherche à percevoir en quoi le processus d’octroi d’asile canadien affecte l’intégration et le sentiment d’appartenance à la société d’accueil. Elle évoque également les difficultés du processus de réintégration à la société d’origine. Finalement, cette étude cherche à s’éloigner du cadre administratif et s’attarde donc particulièrement aux conséquences humaines et vécues de ces phénomènes par l’exploration des perceptions et des interprétations spécifiques à chacun. Les conclusions de cette recherche établissent que les demandeurs d’asile mexicains déboutés par le Canada font face à un double rejet de l’espace. Ayant a priori opté pour l’asile en raison d’une incapacité à accéder à la sécurité et à garantir leur intégrité, l’exil les confronte à un système d’octroi d’asile restrictif et punitif qui freine leur intégration et mène majoritairement à un refus de leur demande. Au retour, la réintégration est bien souvent brimée par la continuation de l’exclusion et la persistance de la discrimination des migrants de retour. La quête migratoire originale se réinitialise, soit la recherche de droits, de libertés et de dignité.<br>This research focuses on the migratory path between Mexico and Canada of disallowed Mexican refugee claimants. Deprived of fundamental rights and freedoms of citizenship, Mexicans live in a constrictive space-time and hold a limited access to mobility. Victims of the failures in the socioeconomic and political systems of Mexico, asylum is often the only option for survival. Once in Canada, Mexican refugee claimants are often confronted with the predominance of asylum criminalization and stigmatization discourse creating a context of massive forced return migrations. Dispossessed of the right to choose where they want to live, Mexican asylum-seekers are facing a double exclusion of space. In this regard, this study explores Mexican refugee claimants’ migratory path through the lived experience and migratory imaginary surrounding it. It also attempts to understand the reasons behind migration as well as the elements responsible of the initial migratory quest’s modulation and transformation. Thus, it seeks to identify to what extent the Canadian asylum granting process affects the integration and sense of belonging to the host country. This research also raises the difficulties of the reintegration process within the society of origin. Finally, this study seeks to move away from the administrative framework and therefore focuses mainly on lived experience and human consequences of these phenomena, by exploring each person’ specific perceptions and interpretations. In conclusion, this research establishes that Mexican refugee claimants disallowed by Canada are facing a double rejection of space. Having a priori opted for asylum because of an inability to obtain safety and ensure their integrity, exile then opposes them to a restrictive and punitive grating system that hinders their integration and often leads to their request being refused. When returning, reintegration is often impeded by the continuation of exclusion and persistent discrimination of returnees. The original migratory quest resets itself, it being the search for rights, freedoms and dignity.

Depuis la fin des années 1990, la recherche s’intéresse de plus en plus à l’insertion professionnelle des enseignants immigrants. On soutient généralement que ceux-ci présentent une richesse pour les sociétés d’accueil (Bascia, 1996 ; Bauer et Akkari, 2016 ; Beynon, Ilieva et Dichupa, 2004 ; Broyon, 2016 ; Deters, 2006 ; Kailasanathan, 2013 ; Myles, Cheng et Wang, 2006 ; Niyubahwe, Mukamurera et Jutras, 2019 ; Phillion, 2003 ; Quiocho et Rios, 2000). Pourtant, les défis auxquels ils font face peuvent devenir sources de tensions et compromettre la réalisation du projet migratoire (Niyubahwe, 2014). Ceci peut provoquer une remise en question sur le plan identitaire et ébranler des conceptions fortement ancrées en ce qui a trait à l’image de soi comme enseignant, ainsi qu’au rapport avec les élèves, les enseignants et la profession (Duchesne, 2017 ; Laghzaoui, 2011 ; Niyubahwe, 2014). Cette recherche vise à comprendre comment ces enseignants négocient le passage d’une identité professionnelle construite dans leur pays d’origine vers une nouvelle identité d’enseignants au Québec. L’analyse, soutenue par les concepts d’insertion professionnelle en enseignement (Mukamurera, Martineau, Bouthiette et Ndoreraho, 2013), de stratégies d’acculturation (Berry, 2005) et d’identité professionnelle (Dubar, 2015), s’intéresse au processus dynamique et interactif de construction identitaire d’enseignants immigrants. Elle permet d’identifier des défis d’acculturation spécifiques à leur insertion professionnelle, de décrire les stratégies mobilisées et d’expliquer le processus de négociation identitaire permettant de se redéfinir comme enseignants en contexte québécois. La collecte de données de cette recherche qualitative interprétative a été réalisée à l’aide d’un questionnaire en ligne ainsi que des entretiens individuels et collectif, semi-dirigés. Les résultats montrent que les défis recensés par les participants concernent majoritairement l’accès à l’emploi. De plus, une perception de discrimination relative au statut ou à l’origine ethnoculturelle est souvent évoquée. Des tensions identitaires se reflètent par une incohérence entre l’image de soi comme professionnel, avant et après l’immigration. Celles-ci entrainent la mobilisation de stratégies d’acculturation visant à négocier ces tensions pour se redéfinir professionnellement. L’analyse permet de constater une forte représentation des stratégies d’assimilation (Berry, 2005) associée au désir de se conformer aux attentes du milieu. De plus, certaines stratégies d’intégration (Berry, 2005) sont identifiées, illustrant l’établissement d’échanges interculturels favorisant une contribution à la société d’accueil. L’interprétation des résultats permet de dégager deux contributions principales de la recherche : l’illustration de postures de négociation identitaires mettant en évidence le rôle des interactions dans le développement de l’identité professionnelle d’enseignants immigrants, et l'adaptation d’un modèle d’analyse des défis d’insertion professionnelle qui tient compte de la phase postmigratoire du parcours. De plus, la thèse contribue aux connaissances en matière d’intégration culturelle en proposant au milieu scolaire, aux ministères concernés et aux universités, des pistes de réflexion au sujet des besoins des enseignants immigrants en insertion professionnelle. Ces pistes pourront aussi alimenter la réflexion des instances concernées au sujet des mesures à mettre en place pour favoriser la rétention du personnel scolaire, la qualité de l’enseignement ainsi que la persévérance scolaire des élèves.<br>Since the late 1990s, research has increasingly focused on the professional integration of immigrant teachers. It is generally argued that these professionals represent a positive contribution to host societies (Bascia, 1996 ; Bauer & Akkari, 2016 ; Beynon, Ilieva & Dichupa, 2004 ; Broyon, 2016 ; Deters, 2006 ; Kailasanathan, 2013 ; Myles, Cheng & Wang, 2006 ; Niyubahwe, Mukamurera & Jutras, 2019 ; Phillion, 2003 ; Quiocho & Rios, 2000). However, the challenges they face become sources of tension, compromising the migration project (Niyubahwe, 2014). This can provoke a questioning about their identity and undermine their conceptions regarding their self-representation as teachers, as well as the relationship with students, teachers and the profession (Duchesne, 2017 ; Laghzaoui, 2011 ; Niyubahwe, 2014). This research aims to understand how these teachers negotiate the transition from a professional identity developed in their country of origin, to a new teacher identity in Quebec. The analysis, supported by the concepts of professional integration in teaching (Mukamurera, Martineau, Bouthiette & Ndoreraho, 2013), acculturation strategies (Berry, 2005) and professional identity (Dubar, 2015), focuses on the dynamic and interactive process of immigrant teachers identity development. The analysis allows us to identify the challenges of acculturation specific to their professional integration, to describe the strategies they mobilized and to explain the identity negotiation process that allows them to redefine themselves as teachers in Quebec. For this interpretative qualitative research the data was collected using an online questionnaire as well as semi-structured individual and group interviews. The results show that the challenges identified by the participants mainly concern employment access. In addition, a perception of discrimination regarding ethnocultural status or origin is often mentioned. Identity tensions are also reflected in an inconsistency between the image of themselves as professionals, before and after immigration. These lead to the mobilization of acculturation strategies to negotiate these tensions in order to redefine their professional identity. The analysis shows a strong representation of assimilation strategies (Berry, 2005) associated with the desire to conform to the environment's expectations. In addition, certain integration strategies (Berry, 2005) are identified, illustrating the establishment of intercultural exchanges contributing to the host society. Scientifically, the research shows two main contributions: the illustration of identity negotiation postures highlighting the role of interactions in the development of immigrant teachers' professional identity, and the adaptation of a model for analyzing the challenges of professional integration that takes into account the migratory path. In addition, this thesis contributes to knowledge of cultural integration by offering school establishments, concerned ministries and universities, avenues regarding the needs of immigrant teachers. These could also stimulate the reflection of the authorities concerned about the measures to put in place to promote the retention of school personnel, the quality of teaching, as well as students' academic perseverance.

In the early 1950s, Kuwait underwent rapid urbanization during which first-generation Hadramis were swiftly absorbed into Kuwaiti urban houses assuming domestic service roles. It is argued that the socioeconomic path of house-serving shaped the Hadrami character and experience of the “model immigrant” as we know it today. However, the study also demonstrates how a Hadrami migratory practice of dependency on the local family and sponsor was inspired by a Kuwaiti cultural and official categorization process of different immigrant groups in which the Hadramis were depicted as loyal, easily satisfied, and non-subversive. While dependency was valued by old Hadramis as a resource and as a form of social capital, it also continued to inform the perceptions, expectations, and actions of the second-generation Hadramis. This chapter analyzes the ways in which the whole experience was conceptualized and contested in daily interaction of the two generations. This study reveals that young Hadramis’ daily activities in Kuwait, and their aspirations for individual self-sufficiency and mobility, can only be carried out by maintaining a difficult balance between the social-triad, and by managing, or perhaps preserving, the legacy of “good reputation.”

AbstractThe phenomenon of irregular migration is very complex in the EU, including Finland. Definitions and practices regarding asylum seekers, refugees, and undocumented migrants are blurred. The laws and immigration policies also attempt to define and enact fixed categories by which to classify undocumented migrants, but these people always escape such legal boundaries through their actions, decisions, and migratory behaviours.In this chapter, we study the asylum-related legislation and processes from the viewpoints of both the authorities who decide whether to grant international protection, and the undocumented migrants who request asylum. The chapter describes the Finnish asylum process in detail, and explains how the undocumented migrants (mostly former asylum seekers) we studied experienced it. Some countries tolerate undocumented migrants, allowing them to work and have access to many public services. In other countries, such as Finland, they are denied the right to work and barely have access to healthcare. Being an undocumented migrant is simultaneously about becoming an undocumented migrant, and failing the asylum process is the most common path to becoming an undocumented migrant. We also indicate how, during the COVID-19 pandemic, the number of new asylum applications in Finland decreased by more than half.

Migration, the movement of people from birthplace to other-place, whether within their own borders or internationally, is one of globalization’s leitmotifs. The scale of migration has risen rapidly in recent decades, some of it the ‘pull’ of opportunities in other countries, but much of it the ‘push’ of poverty, unemployment, conflicts, and environmental degradations that make life unlivable for many. Migration can improve the health and well-being of migrants, and the remittances sent home by overseas émigrés can contribute to domestic poverty reduction in the countries they leave. But forced migration, migrant exploitation, and increasing barriers to the lesser-skilled irregular migrants or asylum-seekers most able to benefit by moving abroad have given rise to new global imperatives to ‘manage migration’ ethically and effectively. Both men and women may be vulnerable to exploitation along the migratory path, but women face additional gendered discriminations in the risk of assault and trafficking.

Classified as a grade IV tumor of the central nervous system, Glioblastoma multiforme (GBM) arises from the glia. A poor understanding of tumor metastasis and limited treatment options have led to increase in deaths of patients suffering from GBM. Studying glioma behavior using aligned structures that mimic native glioblastoma metastatic path is challenging. In this study, we utilize a previously described non-electrospinning platform to manufacture aligned 3D structures called STEP nanonets that not only allows the study of individual cell-nanofiber interaction, but also allows the calculation of migratory forces using beam mechanics. In particular, the blebbing dynamics, force generation, and the effect of an actin disruptor, Cytochalasin D have been investigated on a glioma cell line (DBTRG, Denver Based Tumor Research Group). It was observed that cell pulled onto the nanofibers causing measurable deflections when they were in spread and non-blebbing conditions. In non-spread configurations while attached to fibers, the cells acquired spherical configurations and resumed blebbing. The average migratory force generated by cells exposed to DMSO (control, 1:1000 dilution) using nanonets of 2μm by 400nm fibers was 0.58±0.06nN. Actin disruptor, Cytochalasin D severely compromised the ability of the glioma cells to migrate causing no deflection of the fibers. Forces exerted by tumor cells on their native microenvironment affects their ability to metastasize, invade and proliferate. While the result presents actin disruptor as a potential target to minimize metastasis, the influence of other cytoskeleton disruptors can also be studied using the platform. Moreover, the results obtained from the study can be utilized to better understand the individual cell – nanofibers interaction which can shed light on how cells interact with their native environment during metastasis.