Submitted by PEDRO JULIÃO JIMENEZ null (p_j_jimenez@hotmail.com) on 2016-04-18T20:29:32Z No. of bitstreams: 1 Dissertação-de-mestrado_Pedro_Jimenez_2016 - repositório.pdf: 1264368 bytes, checksum: 9cba2282085ba20e62c6d3e74cb23964 (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-04-19T17:47:28Z (GMT) No. of bitstreams: 1 jimenez_pj_me_bot.pdf: 1264368 bytes, checksum: 9cba2282085ba20e62c6d3e74cb23964 (MD5) / Made available in DSpace on 2016-04-19T17:47:28Z (GMT). No. of bitstreams: 1 jimenez_pj_me_bot.pdf: 1264368 bytes, checksum: 9cba2282085ba20e62c6d3e74cb23964 (MD5) Previous issue date: 2016-02-29 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Experimentalmente, em campo e em laboratório, usando como modelo as espécies Uca leptodactyla e U. uruguayensis, avaliamos como o estímulo direto e o estímulo visual de um competidor interespecífico pode alterar a agressividade e os comportamentos agonísticos durante as lutas intraespecíficas. Vimos que o comportamento de estender o quelípodo (ameaça), que é um comportamento pouco escalado, ocorre em menos lutas na presença do estímulo do competidor interespecífico nos experimentos em laboratório. Em U. leptodactyla, o comportamento de entrelaçar/agarrar os quelípodos, que indica combates mais escalados, esteve presente em mais lutas com o estímulo direto do interespecífico, diferindo das lutas na presença do estímulo do intraespecífico. Nos experimentos com estímulo visual, em U. uruguayensis, houve mais comportamento de entrelaçar no grupo experimental sem a presença do estímulo, diferindo do grupo experimental com estímulo intraespecífico. Nos experimentos em campo, em U. uruguayensis houve maior número do comportamento arremessar, o mais escalado analisado neste estudo, nas lutas com ausência do estímulo de competidores. Os resultados sugerem que na presença de interespecíficos ocorrem diferenças nas lutas, em que menos comportamentos de ameaça são utilizados. Parece haver identidade mal interpretada do estímulo visual dos competidores, pois não ocorrem diferenças entre os grupos com estímulo visual intra- e interespecífico. Os dados sugerem existir diferenças na ameaça oferecida pelo interespecífico para as diferentes espécies, e a avaliação que os indivíduos fazem dos adversários pode ter levado a respostas diferentes pelas espécies. / Experimentally, in field and laboratory, using as models the species Uca leptodactyla e U. uruguayensis, we evaluated how the direct and the visual stimulus of an interspecific competitor can alter the aggressivity and agonistic behaviors in intraspecific fights. The cheliped extend (threat behavior), a less scalated behavior, occurred in less fights in the presence of the interspecific competitor, in the laboratory experiments. In U. leptodactyla, the interlace/grapple behavior, that indicate more escalated combats, occurred in more fights when in the presence of the direct stimulus of the interspecific, differing of the fights in the presence of the intraspecific stimulus. In the field experiments, there was a bigger number of the flick behavior, the most escalated in this study, in the fights of U. uruguayensis when in the absence of competitor’s stimulus. The results suggest that differences occur in the fights when interspecific competitors are present, occurring less threat behaviors. It seems that occur a misidentification of the specie identity when only exposed to visual cues of the competitors, not occurring differences between the groups with the intra- and interspecific stimulus. The data suggests differences in the offered threat by the interspecific between the species, and the assessment that the individuals do about their adversaries can lead to different response by the species.

Orientador: Rodrigo Egydio Barreto / Resumo: Experimentalmente, em campo e em laboratório, usando como modelo as espécies Uca leptodactyla e U. uruguayensis, avaliamos como o estímulo direto e o estímulo visual de um competidor interespecífico pode alterar a agressividade e os comportamentos agonísticos durante as lutas intraespecíficas. Vimos que o comportamento de estender o quelípodo (ameaça), que é um comportamento pouco escalado, ocorre em menos lutas na presença do estímulo do competidor interespecífico nos experimentos em laboratório. Em U. leptodactyla, o comportamento de entrelaçar/agarrar os quelípodos, que indica combates mais escalados, esteve presente em mais lutas com o estímulo direto do interespecífico, diferindo das lutas na presença do estímulo do intraespecífico. Nos experimentos com estímulo visual, em U. uruguayensis, houve mais comportamento de entrelaçar no grupo experimental sem a presença do estímulo, diferindo do grupo experimental com estímulo intraespecífico. Nos experimentos em campo, em U. uruguayensis houve maior número do comportamento arremessar, o mais escalado analisado neste estudo, nas lutas com ausência do estímulo de competidores. Os resultados sugerem que na presença de interespecíficos ocorrem diferenças nas lutas, em que menos comportamentos de ameaça são utilizados. Parece haver identidade mal interpretada do estímulo visual dos competidores, pois não ocorrem diferenças entre os grupos com estímulo visual intra- e interespecífico. Os dados sugerem existir diferenças na ameaça o... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Experimentally, in field and laboratory, using as models the species Uca leptodactyla e U. uruguayensis, we evaluated how the direct and the visual stimulus of an interspecific competitor can alter the aggressivity and agonistic behaviors in intraspecific fights. The cheliped extend (threat behavior), a less scalated behavior, occurred in less fights in the presence of the interspecific competitor, in the laboratory experiments. In U. leptodactyla, the interlace/grapple behavior, that indicate more escalated combats, occurred in more fights when in the presence of the direct stimulus of the interspecific, differing of the fights in the presence of the intraspecific stimulus. In the field experiments, there was a bigger number of the flick behavior, the most escalated in this study, in the fights of U. uruguayensis when in the absence of competitor’s stimulus. The results suggest that differences occur in the fights when interspecific competitors are present, occurring less threat behaviors. It seems that occur a misidentification of the specie identity when only exposed to visual cues of the competitors, not occurring differences between the groups with the intra- and interspecific stimulus. The data suggests differences in the offered threat by the interspecific between the species, and the assessment that the individuals do about their adversaries can lead to different response by the species. / Mestre

Made available in DSpace on 2014-07-29T12:05:40Z (GMT). No. of bitstreams: 1 Tese_FINALJoao_Nabout.pdf: 1455749 bytes, checksum: 9b7b11f9fe664d7c2e865eff445ff3d0 (MD5) Previous issue date: 2009-11-17 / Macroecology of the genus Uca (Crustacea, Decapoda): Patterns of diversity, distribution and responses to global change. The genus Uca, composed by 97 species, has a worldwide distribution on coastal marine regions, mainly in tropical environments. Many researches have used the genus Uca as a model of study, although the actual scientific knowledge about this group is dispersed. Moreover, few studies have investigated its global and evolutive patterns. In this sense, considering that the genus Uca has no taxonomic problems (there is a consensus about its distribution and species identification), presents wide geographical distribution and has phylogenetic topologies, this group can be used as an excellent model to test macroecological and evolutionary hypotheses, and to discuss the effects of climate change on coastal organisms. The aim of this study was to detect trends and biases in scientific literature about the genus Uca, as well as to assess macroecological patterns (at a global scale) and to evaluate the influence of climate change on the geographical range size and species richness. Moreover, we associated the information generated to improve conservation strategies for species of the genus Uca. Considering our goals, we generated four papers in this thesis. Among the most prominent results, we observed that, the number of papers about the genus Uca indexed in Thomson ISI database, did not increase between 1991 and 2007, which may indicate the lack of interest of the scientific community on this taxonomic group. Moreover, the majority of the scientific production about the genus Uca came from institutions in the USA. The studies about the genus Uca were mainly characterized as population papers (which analyzes population attributes such as density, distribution and ecological interactions). The results of species accumulation curve demonstrated that the total number of Uca species currently know (97 described species) is substantially lower than the number predicted by the asymptote of the Gompertz model (134 species predicted), suggesting that new species need to be described. However, a new species of Uca is not described since 1987. Models were generated to explain the date of species description based on the body size, geographical range size, human influence and the type of habitat of each species. These models were selected using the Akaike Information Criteria (AIC). The best model among the candidate ones (explaining 37% of the total variance) was composed by variables representing the geographical range size of species, their body size and the human influence on them. In other words, large-bodied species and those widely distributed, mainly in regions with elevated human influence, were described earlier. In another paper of this thesis, we evaluated the levels of phylogenetic heritability of species of the genus Uca on their geographical range size, shape and position. If a strong phylogenetic signal of geographic range sizes exists between close related species, we can predict the unknown geographic range of species through the known geographic range of its relatives, which is useful for conservation purposes. However, the absence of phylogenetic signal was evidenced for this trait. On the other hand, there was a strong phylogenetic pattern considering the position of the range (mainly along longitudinal axis), probably due to mechanisms of vicariant allopatric speciation and to the geographical structure of the cladogenesis of the group. In the last paper, the impact of global changes on geographic range size of genus Uca were modeled, producing a comprehension about a poleward shift and elaborating maps of species richness based in two scenarios of global change. The models generated presented good performance, and predictions are that the species will probably have reduced the geographical range size and some species will be extinct (considering two scenarios until 2050), mainly in the tropical regions. Moreover, the range of species with midpoints in both hemispheres changed towards to poles in the future scenarios of climatic changes. Finally, the results of this set of papers highlighted the urgency of detailed studies for some species of Uca, and in some coastal marine regions (e.g. Indo-West Pacific) to evaluate the actual status of the distribution of species of the genus Uca and the real species richness of this genus. This is essential to generate local strategies aiming to minimize impacts of global change on coastal organism / O gênero Uca é composto atualmente por 97 espécies, distribuídas mundialmente, ocupando ambientes costeiros marinhos, principalmente da região tropical. Diversos campos de pesquisa têm desenvolvidos trabalhos usando o gênero Uca como modelo, entretanto, atualmente o conhecimento científico sobre esse grupo apresenta-se disperso, além disso, estudos sobre padrões globais e evolutivos ainda são incipientes. Dessa forma, considerando que o gênero Uca é taxonomicamente resolvidos (i.e., consenso na distribuição e identificação das espécies), apresenta ampla distribuição geográfica e existem topologias filogenéticas, estes tornam-se excelentes modelos para testar hipóteses macroecólogicas, evolutivas e discutir efeitos de mudanças climáticas sobre organismos costeiros. O objetivo geral desse trabalho foi avaliar tendências e detectar vieses da literatura científica global de caranguejos do gênero Uca, bem como investigar padrões macroecológicos em escala global e a influência das mudanças climáticas na distribuição geográfica e riqueza de espécies desse grupo de caranguejo, além disso, associar as informações geradas para avançar em estratégias de conservação para essas espécies. Dessa forma, considerando o objetivo geral desse trabalho, foram gerados quatro artigos apresentados nessa tese. Dentre os resultados mais importantes, observamos que o número de artigos sobre Uca indexados na base Thomson ISI não aumentou ao longo dos anos (1991 até 2007), o que pode indicar que não houve aumento de interesse da comunidade científica com esse grupo de organismo, além disso, a maior parte da produção científica sobre Uca foi desenvolvidas por instituições dos Estados Unidos. Os estudos sobre Uca foram principalmente caracterizados como artigos de cunho populacional (i.e. analisaram atributos como densidade, distribuição e interações ecológicas). Apesar de um longo tempo não serem descritas novas espécies de Uca (última espécie foi descrita em 1987), os resultados da curva de acumulação de espécies demonstraram que o número total de espécies de Uca atualmente descrito é menor do que o número de espécies predito pela assíntota do modelo de Gompertz (preditos 134 espécies), sugerindo que existem novas espécies de Uca para serem descritas. Além disso, foram gerados modelos para explicar a data de descrição de espécies, baseado no tamanho da carapaça, tamanho da área de distribuição geográfica, influência humana nos locais de ocorrência das espécies e o tipo de habitat da espécie. Esses modelos foram confrontados e selecionados de acordo com o Critério de Informação de Akaike (AIC). O melhor modelo foi composto pelo tamanho da distribuição geográfica, tamanho do corpo e influência humana, explicando 37% da variação total dos dados, dessa forma, as espécies descritas primeiramente apresentaram maior tamanho corpóreo, maiores áreas de distribuição geográfica e ocorrem em regiões de elevada influência humana. Em outro artigo desenvolvido nessa tese, foi avaliado os níveis de herdabilidade filogenética do tamanho, forma e posição da distribuição geográfica de espécies de Uca. A existência do sinal filogenético para o tamanho da distribuição geográfica pode auxiliar em estratégias para conservação, pois é possível prever o tamanho da distribuição geográfica de uma espécie caso se conheça o tamanho da distribuição de uma espécie filogeneticamente próxima. Entretanto, para as espécies de Uca, foi observado ausência de sinal filogenético para esse caráter. Somente a posição da distribuição geográfica (ao longo do eixo longitudinal) apresentou um forte padrão filogenético, possivelmente devido ao processo de especiação alopátrica vicariante e a estrutura geográfica dos clados. Para o último artigo, foram modelados os impactos das mudanças climáticas globais sobre a distribuição geográfica das espécies de Uca, gerando uma compreensão do deslocamento das espécies em direção aos pólos e ainda produzindo um mapa de riqueza de espécies com base em cenário otimistas e pessimistas de mudanças climáticas globais. Os modelos gerados apresentaram bom desempenho, e grande parte das espécies de Uca apresentarão diminuição da distribuição geográfica acarretando perda de espécies (para cenários projetados para 2050), principalmente nas regiões tropicais, ainda assim, as espécies com pontos médios de ocorrência em ambos os hemisfério, tenderão a direcionar-se para os pólos nos cenários futuros de mudanças climáticas. Por fim, os resultados desse conjunto de artigos evidenciam a urgência de estudos ambientais para diversas espécies de Uca e de regiões costeiras (e.g. Indo-Oeste Pacífico) a fim de gerar um painel atualizado da distribuição e riqueza de espécies de Uca, que permitirão gerar estratégias locais para minimizar impactos das mudanças climáticas

The Wilson’s Plover (Charadrius wilsonia) is a species of concern in most southeastern U.S. coastal states, where it breeds and winters. The U.S. Shorebird Conservation Plan listed this species as a Species of High Concern (Prioritization Category 4), and the U.S. Fish and Wildlife Service has designated it as a Bird of Conservation Concern (BCC). Despite its conservation status, Wilson’s Plover population trends are poorly understood and little research has been conducted examining habitat factors affecting this species’ breeding and foraging ecology. I collected Wilson’s Plover demographic data and explored which habitat characteristics influenced breeding success and foraging site selection among three coastal habitat types (i.e. fiddler crab (Uca spp.) mud flats, beach front, and interdune sand flats) at Onslow Beach, Marine Corps Base Camp Lejeune, North Carolina, 2008-2009. I observed little difference between years in nest success (≥ 1 egg hatched), failure, and overall nest survival. The majority of nest failures were caused by mammalian predators. For those nests that hatched successfully, greater proportions were located in clumped vegetation than on bare ground or sparsely vegetated areas. In-season chick survival for both years was higher for nests that hatched earlier in the season, and for nests farthest from the broods’ final foraging territory. Productivity estimates (chicks fledged per breeding pair) were not significantly different between years (0.88 ± 0.26 fledged/pair in 2008, 1.00 ± 0.25 fledged/pair in 2009) despite a shift in foraging behavior, possibly related to habitat alterations and availability in 2009. My findings indicate that Wilson’s Plover adults and broods were flexible in establishing final foraging territories; in 2008 all final brood foraging territories were on fiddler flats while in 2009, final foraging territories were sometimes split between fiddler flats, beach front, and interdune sand flats. For those Wilson’s Plovers establishing territories on fiddler flats, area of the flat was the most important feature explaining use versus non-use of a particular flat; area ≥ 1250 m² was preferred. Close proximity to water and vegetative cover were also important habitat features in foraging site selection on fiddler crab mud flats, and in all habitat types combined. My findings will directly contribute to population and habitat research goals outlined in the U.S. Shorebird Plan and will supplement limited data about foraging and habitat use related to Wilson’s Plover breeding ecology. / Master of Science

The effect of cattle grazing on the abundance and distribution of vegetation, burrowing crabs (Uca rapax, Uca pugnax, and Sesarma cinereum), marsh periwinkles (Littoraria irrorata), horn snails (Cerithidea pliculosa), and salt marsh snails (Melampus bidentatus) was evaluated over four seasons (summer 2000, fall 2000, winter 2001, and spring 2001) in grazed and ungrazed treatments. A Galveston Island salt marsh adjacent to Snake Island Cove was sampled at five elevations, from the water's edge to the high tidal flats. Data were analyzed for statistical differences using a two-way ANOVA in SAS. Cattle grazing may affect the vegetation and macroinvertebrate communities in salt marshes through trampling and herbivory. Vegetation resources available to other herbivores are decreased by the direct consumption of plant material by cattle. Spartina alterniflora and Salicornia virginica heights were significantly greater in ungrazed treatments than grazed for every season in the edge, upper, and middle elevation zones. Total aerial vegetative cover was also reduced significantly in grazed treatments, with the greatest impact in the edge and upper marsh. In the ungrazed treatments, S. alterniflora stem density was significantly greater in edge elevations, while both S. virginica percent cover and stem density in the edge elevation was greater. Burrowing crab populations were greater in the upper marsh and edge habitat of ungrazed treatments, while significantly greater in most of the middle marsh habitats of the grazed treatment. Size of burrowing crabs was generally significantly greater in ungrazed treatments. Cerithidea pliculosa size decreased in grazed treatments, but population had an overall increase in grazed treatments. Littoraria irrorata had very few differences between treatments, although few specimens were found. Melampus bidentatus populations were too small to evaluate thoroughly. Macroinvertebrate populations could be used to assess the overall health of grazed salt marshes.

The effect of cattle grazing on the abundance and distribution of vegetation, burrowing crabs (Uca rapax, Uca pugnax, and Sesarma cinereum), marsh periwinkles (Littoraria irrorata), horn snails (Cerithidea pliculosa), and salt marsh snails (Melampus bidentatus) was evaluated over four seasons (summer 2000, fall 2000, winter 2001, and spring 2001) in grazed and ungrazed treatments. A Galveston Island salt marsh adjacent to Snake Island Cove was sampled at five elevations, from the water's edge to the high tidal flats. Data were analyzed for statistical differences using a two-way ANOVA in SAS. Cattle grazing may affect the vegetation and macroinvertebrate communities in salt marshes through trampling and herbivory. Vegetation resources available to other herbivores are decreased by the direct consumption of plant material by cattle. Spartina alterniflora and Salicornia virginica heights were significantly greater in ungrazed treatments than grazed for every season in the edge, upper, and middle elevation zones. Total aerial vegetative cover was also reduced significantly in grazed treatments, with the greatest impact in the edge and upper marsh. In the ungrazed treatments, S. alterniflora stem density was significantly greater in edge elevations, while both S. virginica percent cover and stem density in the edge elevation was greater. Burrowing crab populations were greater in the upper marsh and edge habitat of ungrazed treatments, while significantly greater in most of the middle marsh habitats of the grazed treatment. Size of burrowing crabs was generally significantly greater in ungrazed treatments. Cerithidea pliculosa size decreased in grazed treatments, but population had an overall increase in grazed treatments. Littoraria irrorata had very few differences between treatments, although few specimens were found. Melampus bidentatus populations were too small to evaluate thoroughly. Macroinvertebrate populations could be used to assess the overall health of grazed salt marshes.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The present study investigated the effect of different strata of tide on the abundance, size, sex ratio, population structure, relative growth, morphological sexual maturity, amount of ovigerous females and reproductive burrows in U. leptodactylus. To this end, monthly collections were made from January to December 2013 in two strata of the intertidal, estuaries of Sergipe river and Vaza-barris river, using a square with internal area of 90cm², launched ten times randomly within each strata. For each stratum monthly measures air temperature, substrate temperature, water temperature, salinity and samples episubstrate for the determination of particle size and composition of organic matter were taken. In the laboratory, crabs were sexed, measured and preserved in 70% alcohol. The monthly results were statistically compared between strata and estuaries, there are similarities in environmental factors analyzed between strata, with an analysis of the abundance, size, relative growth and sexual maturity divergent between the same strata.The abundance and size of crabs were higher in the open strata of both estuaries, with the estuary of Vaza-barris river more abundant than estuary of Sergipe river, which in turn showed higher crabs. The sex ratio was not significantly different between the strata of the estuary of Vaza-barris river, but presented to the estuary of Sergipe river, where in the open strata occurred more males and more females in the vegetated strata. Population structure showed 19 classes of size 0.5 mm with modal distribution of recent juveniles for vegetated strata and adults to open strata. Juvenile and adult crabs showed positive allometric growth between carapace width and length of the propodus and width of the abdomen, separately for each sex. The fiddler crabs vegetated strata matured in smaller sizes than that observed for the open strata in both estuaries, in the estuary of Vaza-barris river males and females matured with 6.18 and 5.26 mm and 4.94 and 4.91 mm carapace width in open and vegetated strata, respectively. In the estuary of Sergipe river males and females matured with 5.61 and 5.36 and 5.24 mm and 4.39 mm carapace width in open and vegetated strata respectively. The similarity in abiotic factors between open and vegetated strata, and differences in the abundance, population structure and reproductive biology have led to the consideration of the reproductive behavior of lekking for U. leptodactylus. Ovigerous females and reproductive burrows occurred primarily in the open strata, so these areas were considered reproductive arenas, while vegetated strata were considered priority areas in recruitment. / O presente trabalho investigou o efeito de diferentes estratos de maré sobre a abundância, tamanho, razão sexual, estrutura populacional, crescimento relativo, maturidade sexual morfológica, quantidade de fêmeas ovígeras e tocas reprodutivas em U. leptodactylus. Para tal, foram realizadas coletas mensais no período de Janeiro à Dezembro de 2013 em dois estratos do entremarés, nos estuários do rio Sergipe e rio Vaza-barris, utilizando-se um quadrado com área interna de 90cm², lançado dez vezes aleatoriamente em cada estrato. Para cada estrato mensalmente foram tomadas as medidas de temperatura do ar, temperatura do substrato, temperatura da água, salinidade e amostras do episubstrato, para a determinação do teor de matéria orgânica e composição granulometria. Em laboratório, os caranguejos foram sexados, medidos e conservados em álcool 70%. Os resultados obtidos mensalmente foram comparados estatisticamente entre estratos e estuários, observou-se semelhança nos fatores ambientais analisado entre os estratos, sendo a análise da abundância, tamanho, crescimento relativo e maturidade sexual divergente entre os mesmos estratos. A abundância e o tamanho dos caranguejos foram maiores nos estratos abertos de ambos os estuários, sendo o estuário do rio Vaza-barris mais abundante do que o estuário do rio Sergipe, que por sua vez apresentou caranguejos maiores. A razão sexual não apresentou diferença significativa entre os estratos para o estuário do rio Vaza-barris, porém apresentou para o estuário do rio Sergipe, onde no estrato aberto ocorreram mais machos e nos estratos vegetados mais fêmeas. A estrutura populacional apresentou 19 classes de tamanho de 0,5 mm, com distribuição modal de juvenis recentes para os estratos vegetados e de adultos para os estratos abertos. Os caranguejos juvenis e adultos apresentaram crescimento alométrico positivo entre a largura da carapaça e comprimento do própodo e largura do abdômen, separadamente para cada sexo. Os chama-marés dos estratos vegetados maturaram em tamanhos menores do que o observado para os estratos abertos de ambos os estuários, no estuários do rio Vaza-barris os machos e fêmeas maturaram com 6,18 e 5,26 mm e 4,94 e 4,91 mm de largura da carapaça nos estratos aberto e vegetado, respectivamente. No estuário do rio Sergipe os machos e fêmeas maturaram com 5,61 e 5,36 mm e 5,24 e 4,39 mm de largura da carapaça nos estratos aberto e vegetado, respectivamente. A semelhança nos fatores abióticos entre os estratos abertos e vegetados, e as divergências na abundância, estrutura populacional e biologia reprodutiva, levaram à consideração do comportamento reprodutivo de lekking para U. leptodactylus. As fêmeas ovígeras e tocas reprodutivas ocorreram prioritariamente nos estratos abertos, portanto essas áreas foram consideradas arenas reprodutivas, enquanto os estratos vegetados foram considerados áreas prioritárias no recrutamento.

La région du Saguenay-Lac-St-Jean est géographiquement située dans une enclave qui a contribué à l’isolement des populations s’y étant installées. Aussi cet éloignement aurait-il favorisé la présence de certaines spécificités culturelles dans cette région, spécificités ayant été relevées au sein de plusieurs domaines tel que la génétique, la linguistique, le patrimoine culinaire, l’histoire et la musique. Cette recherche vise à documenter plus spécifiquement l’élément musical dans la région du Saguenay-Lac-St-Jean par l’analyse du style et du répertoire de quatre joueurs de violon traditionnel ayant appris par transmission orale. La classification du répertoire et l’identification de différentes techniques de jeu au niveau du style permettent de relever à la fois des éléments communs et distincts chez les quatre violoneux. Outre les analyses quantitatives et qualitatives proposées au niveau du répertoire et du style, cette recherche comprend un survol de l’histoire des populations de la région avançant différentes pistes sur les origines et les influences des violoneux ayant habité ou séjourné sur le territoire depuis la traite des fourrures jusqu’à l’industrialisation, de même qu’un recensement de plus d’une centaine de violoneux du Saguenay-Lac-St-Jean depuis la colonisation, et un lexique endogène de la terminologie des violoneux étudiés. / The Saguenay-Lac-St-Jean region is an enclave, and this fact contributed, through the years, to the isolation of the populations established there. This isolation is a factor that would have contributed to the presence of cultural distinctiveness amongst the inhabitants of the region. This cultural specificity has been observed in many fields of research, such as genetics, linguistics, culinary traditions, history and music. This thesis documents the musical element of culture in the region of Saguenay-Lac-St-Jean, through the analysis of style and repertoire of four fiddle players from the region. The classification of repertoire and the identification of different playing techniques, highlight both common and individual elements featured in the music of these four fiddlers. The research also contains a historical overview of the people who lived in or crossed the region, from the period of fur trading to industrialisation, and how they could have influenced the music in this region. Additionally, this research contains a census of over 100 fiddle players who have inhabited or passed through the region since colonisation, as well as a lexic explaining over 70 terms and expressions used by the fiddle players of Saguenay-Lac-St-Jean.