Дисертації з теми "Limicoli"
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Roppa, Flavio. "Dinamiche di utilizzo dell'habitat in 3 specie di limicoli nella zona costiera del Friuli Venezia Giulia." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3171.
Повний текст джерелаGli uccelli limicoli sono importanti indicatori su scala globale della stato delle zone umide e la perdita di tali habitat è la principale causa del decremento di molte delle loro popolazioni. Questa ricerca analizza le strategie di utilizzo dell’habitat nel Chiurlo (Numenius arquata), nella Pivieressa (Pluvialis squatarola) e nel Piovanello pancianera (Calidris alpina), che assieme rappresentano più del 90% dei limicoli svernanti in Friuli Venezia Giulia. Le popolazioni sono state monitorate mensilmente ai roost da ottobre 2005 a maggio 2008. Nello stesso periodo 17 Chiurli, 19 Pivieresse e 71 Piovanelli pancianera sono stati radiomarcati nel settore orientale dell’area di studio e monitorati per un totale di 1.762 localizzazioni (fix). Emerge una generale stabilità delle popolazioni svernanti. Il calo legato alla migrazione primaverile si verifica prima nel Chiurlo (marzo-aprile) e nel Piovanello pancianera (aprile-maggio), più tardivamente nella Pivieressa (maggio-giugno), mentre la migrazione postriproduttiva copre una finestra temporale più ampia per tutte e tre le specie. La telemetria ha fornito delle conferme agli andamenti fenologici ed evidenzia una bassa mobilità nelle tre specie, data anche l’elevata fedeltà ai siti di roost. I fix, infatti, si concentrano prevalentemente nel settore orientale dell’area di studio, dove è avvenuta la cattura degli individui. Dall’analisi degli home range, la mobilità minore si registra nel Chiurlo, poco superiore è quella della Pivieressa, mentre il Piovanello pancianera presenta gli spostamenti maggiori. La presenza di numerosi roost ed aree di foraggiamento anche nella parte centro-occidentale dell’area di studio ha suggerito come specifici settori siano utilizzati prevalentemente da differenti gruppi di individui, sia per la sosta che per l’alimentazione. Queste “unità funzionali” sono state verificate ed analizzate nel Chiurlo sulla base della risorsa trofica presente, misurata tramite campionamenti bentonici, e del comportamento di foraggiamento degli individui, ottenuto tramite videoriprese. Infine, per la Pivieressa e il Chiurlo si evidenzia una stagionalità nell’utilizzo dell’habitat, anche per singole unità funzionali. L’elevata localizzazione che caratterizza gli individui radiomarcati mette in luce l’importanza delle core area di alimentazione e di sosta. Data l’evidenza delle dinamiche spaziali e temporali legate alle diverse popolazioni e la presenza di differenti unità funzionali, quanto emerso rappresenta uno strumento importante per pianificare al meglio la conservazione di queste popolazioni, in un’ottica adattativa di gestione del territorio.
XXI Ciclo
1977
Kanao, Tadayoshi. "Studies on the reductive tricarboxylic acid cycle from the green sulfur bacterium Chlorobium limicola." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149456.
Повний текст джерелаQuenec'hdu, Sophie. "Parametres influencant la repartition spatiale des limicoles : sediment et parasites." Rennes 1, 1999. http://www.theses.fr/1999REN10008.
Повний текст джерелаScruggs, Caroline E. "Factors affecting the growth of Nostocoida limicola II and other filamentous microorganisms in activated sludge systems." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08292008-063138/.
Повний текст джерелаChambon, Rémi. "Dynamiques spatio-temporelles individuelles chez une sous-population migratrice partielle d’une espèce limicole pionnière, l’avocette élégante (Recurvirostra avosetta)." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1B051.
Повний текст джерелаThe description of the wintering- and breeding-ground-selection patterns and the study of the associated determinants and consequences at the individual scale are crucial to understand and predict individuals’ distribution and demographic trends at the population scale. These issues are of major importance for Shorebirds, like the Pied avocet (Recurvirostra avosetta), which typically use coastal wetlands that are threatened by global changes. The main analyses from the present document are based on individual encounter histories (2099 Avocets ringed between 2006 and 2015 among 5 of the major breeding sites from the French Atlantic littoral). The results show that natal conditions (site and date) influence the wintering behaviour adopted during the first winter (overwintering in the natal site, in a neighbouring French site, or in a foreign quarter through migration). Birds are particularly faithful to this behaviour in subsequent winters. Furthermore, ringed birds are strongly faithful to their natal site over breeding seasons. This philopatry is likely influenced by the management actions carried out in the nesting habitats of the natal sites, of which the effectiveness was additionally demonstrated. Finally, the interannual survival is relatively high from the first winter and independent of the wintering behaviour and breeding site. Overall, the results contribute to understand the dynamics of the subpopulation studied and to elaborate a management framework for the conservation of the Pied avocet and species with similar ecological requirements
ALBOUY, DELPHINE. "Etude des proteines impliquees dans les etapes premieres de la photosynthese chez la bacterie verte sulfureuse chlorobium limicola forma thiosulfatophilum." Paris 11, 1995. http://www.theses.fr/1995PA112329.
Повний текст джерелаDegré, Delphine. "Réseau trophique de l'anse de l'Aiguillon : dynamique et structure spatiale de la macrofaune et des limicoles hivernants." La Rochelle, 2006. http://www.theses.fr/2006LAROS173.
Повний текст джерелаWe have studied the food-web of the Aiguillon cove with three approaches. The first quantitative one underlines the spatial dynamics of the sediment’s characteristics, the molluscs’ communities (dominance of Hydrobia ulvae in number and Scrobicularia plana in biomass) and the waders’ communities (international importance of the Aiguillon cove for Dunlins, Knots, Black tailed godwits and Avocets populations). On the 37. 45 km², we have estimated the molluscs’ stocks from 331 to 367 tons of ash free dry mass, the birds’ consumption from 150 to 799 tons. Y-1 and the secondary production of the bivalves’ populations from 165 et 1026 tons. Y-1. The carrying capacity of the wintering site for waterbirds is not limited by the molluscs’ resources. The second qualitative approach allows trophic fluxes to be characterized by carbon and nitrogen stable isotope analyses. We confirmed that waders are mainly benthivorous both on wintering grounds and moult sites. In the third modelling approach, we used the inverse analyses to estimate the carbon fluxes in the bentho-pelagic system. The model is sensitive to variations of the resuspension of microphytobenthos or detritus and for bivalves’ productivity. Network analysis indices highlight a low complexity and maturity of the system, dominated by detritic activity, but with a high production and a net high quality exportation via waders’ migration. However waders’ activity is very low
Quaintenne, Gwenaël. "Sélection de l'habitat et des ressources trophiques chez le bécasseau maubèche Calidris canutus : distribution à l'échelle européenne et particularités des sites d'hivernage français." La Rochelle, 2010. http://www.theses.fr/2010LAROS292.
Повний текст джерелаThe aim of this thesis is to contribute to extend the body of knowledge on the feeding ecology of a molluscivore shorebird, the Red Knot Calidris canutus islandica. The species winter on estuarine bays in North Western Europe where it only feed on molluscs. The modalities of prey selection and then of habitat selection have been firstly studied along a large geographical scale of five sites throughout the range of the overwintering Red Knot’s distribution in Europe. Then the particularities of overwintering French sites, never detailed so far, were studied. The establishment of previous model of diet selection under digestive constraint predicted fairly well the observed diet of Red Knot on four of its wintering area across north western Europe. This validated model allowing us to test then if the observed densities of Red Knots were consistent with prediction of the “ideal free distribution” model. We were able to explain most of observed distributions of Knots. Most of the deviations to predictions would then be linked to digestive constraint and attraction towards feeding conspecifics for this social specie. In France, Red Knots are concentrated in a very limited number of wintering sites on Channel or Atlantic coasts. The detailed study of availability of molluscs food stocks compared with diet allowed us to describe the feeding strategy of the species on three study sites on Channel coast. The interannual variation in feeding strategy was studied on two bays located the Pertuis Charentais and Breton where a long-term survey of prey stocks has been carried on each winter since 2004
Morelle, Nathalie. "Attribution assistée par ordinateur des spectres RMN de protéines : application à l'étude structurale des ferrocytochromes c555 de Chlorobium limicola f. thiosulfatophilum et c2 de Rhodobacter capsulatus." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10166.
Повний текст джерелаPhilippe, Anne. "Interactions between shorebirds and benthic macrofauna : making small things bigger." Thesis, La Rochelle, 2016. http://www.theses.fr/2016LAROS012/document.
Повний текст джерелаIntertidal mudflats are complex ecosystems undergoing constant changes, home to infaunal invertebrates (benthic macrofauna), and migratory sites for particular birds : shorebirds. This research focuses on predator-prey interactions between shorebirds and their macrobenthic prey. The present thesis is composed of 8 chapters which illustrate different spatio-temporal scales : from seasons to the decade, and from the bay to the migratory flyway. These studies are based on regular benthic sampling of intertidal flats along the Bay of Biscay (France), as well as sampling data from the Dutch Wadden Sea and the Mauritanian Banc d’Arguin. Macrobenthic data (quality, sizes, densities, biomass) are linked with shorebird counts and data about their feeding behaviour (diet reconstruction from isotopes, faeces, modeling and video observations). These eight studies shed light on particular relationships between some prey and their predators, and the ecology of these interactions (including environmental variables such as inundation time, grain size, temperature, primary production, or even latitude). Particular attention is given to the variability of prey and predator behaviour in time and space. Inserts are included in between chapters to illustrate for instance different diet reconstruction techniques, anti-predation traits in marine molluscs, or relation between energy available and site selection in shorebirds
Rolet, Céline. "Les communautés macrozoobenthiques des sédiments meubles intertidaux du littoral Nord – Pas-de-Calais : structure, relations avec les limicoles hivernants et enjeux de conservation." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10052/document.
Повний текст джерелаSoft intertidal areas are recognized as major interface ecosystems providing permanent or transitory habitat for reproduction, feeding and migration of many species. However, in the context of increasing human impact on coastal areas, beaches and estuaries are highly threatened. Studying their biodiversity and ecological functioning is therefore required to implement effective management and conservation strategies. As a contribution to achieve this goal, the relationship between benthic macrofauna (preys) and shorebirds (among their most important predators) were studied at the scale of Northern France. The main questions of this study were: (1) What are the macrobenthic communities found in soft intertidal areas (beaches and estuaries)? (2) What are their relationships with wintering shorebirds in a spatial context? (3) Do human forcings potentially affect these two biological compartments (i.e. benthic communities and shorebirds)? This work enabled, in a first step, the characterization of macrozoobenthic communities located in soft intertidal areas (diversity, abundance, biomass and spatial distribution) according to the EUNIS habitat classification. The relationship (functional approach) between these communities and their major predators (shorebirds) in winter has been investigated in a second step. Ecologically important sites have been identified and should be targeted as a priority for the implementation of management and conservation strategies at the regional scale
Kohler, Sophie. "Écologie throphique de l’huitrier noir africain (haematopus-moquini) sur les littoraux rocheux de l’Afrique Australe en relation avec la viabilité de son habitat." Thesis, La Réunion, 2011. http://www.theses.fr/2011LARE0005/document.
Повний текст джерелаThe distribution of intertidal benthic species is constrained by coastal oceanography. Less is known about the effects on the ecology of predators. Along the southern coasts of Africa the two main currents constraint both the patterns of primary production and the structure of benthic communities. The top predator on these coasts is an endemic shorebird, the African Black Oystercatcher (Haematopus moquini), which exhibits a polymorphism favourable for food specialization. This study investigates the effect of spatial variations in benthic community structure on the feeding ecology of oystercatchers using stable isotopes. Birds respond to changes in quality and quantity of prey at multiple scales. At large scale they show strong contrasts between west and southwest coasts where the diet is dominated by mussels, including the invasive species Mytilus galloprovincialis, and south-east shores where a mixture of mussels and limpets is consumed. Locally individuals show weak dietary differences related to relative abundances of mussels and limpets. This reflects the generalist foraging behaviour of the species and the release of intra-specific competition for resources. The dietary shift of H. moquini on the west coast toward the invasive mussel and the multiplicity of foraging behaviours elsewhere reveal strong capacities to face changes in its foraging habitat. On the other hand the degradation of beaches by humans increases the competition for space and today affects the reproductive success of the species
Kohler, Sophie. "Écologie throphique de l'huitrier noir africain (haematopus-moquini) sur les littoraux rocheux de l'Afrique Australe en relation avec la viabilité de son habitat." Phd thesis, Université de la Réunion, 2011. http://tel.archives-ouvertes.fr/tel-00688119.
Повний текст джерелаRobin, Frédéric. "Dynamique de la distribution, sélection de l’habitat et stratégie d’alimentation chez la barge à queue noire limosa limosa à l’échelle des sites d’hivernage français." Thesis, La Rochelle, 2011. http://www.theses.fr/2011LAROS324.
Повний текст джерелаThe Black-tailed godwit Limosa limosa is a shorebird species commonly observed in France throughout the year. Two sub-species are dissociated in West European. The so called “continental” Godwit L. l. limosa is observed in France during migration cycles and some pairs breed in marshes on the Atlantic coast; the so called “Icelandic” Godwit winters exclusively along coast of the Western Europe. This present work mainly investigates the wintering ecology of Icelandic–godwit in coastal mudflats of France. Contrarily to the continental sub-species, the whole Icelandic-godwit L. l. islandica population increased quantitatively as long as the number of sites used. In France, national counts pointed out that wintering population follows this trend and have increased from 1350 to 27000 individuals during the last twenty years. This population represents now around 30% of the whole islandica population but individuals stage in large flocks in a very limited number of sites, mainly included in Nature Reserves. From standard biometrics, molecular analyses and resighting data, phenologies of the both sub-species can then be specified for France. Furthermore, this study allowed to define how long the wintering period lasts in France for Icelandic-Godwits, between 2 and 8 months depending on individuals. Phenology at site scale suggested that godwits used several sites throughout the winter. As currently used for understanding the distribution of bird populations, trophic resource availability was studied in regard to the diet of the Black-tailed godwit from macrofauna sampling, droppings collection and stable isotope analyses. At the Pertuis Charentais scale, two feeding behaviors were clearly distinguished: seagrass grazing (Zostera notlii) or bivalve probing (Macoma balthica). Food depletion along the winter is expected to lead to the decrease of local populations, and to the selection of new feeding area or roost. Considering the distribution of the species at the national level, the diets were recorded depending on the mudflats’ characteristics. Even if food distribution is commonly used to understand at first the bird population distribution, our observations point out that, here at a local level, more parameters may influence the wintering distribution such as sediment characteristics, intra and inter-specific interactions, high tide roosts availability and human disturbances as the hunt. This work allowed to establish a solid knowledge and to collect many complementary data to test the distribution theories on the Black-tailed Godwit population wintering in France
Touzalin, Frédéric. "Evolutionary demography of a partial migrant shorebird species." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30349/document.
Повний текст джерелаGlobal warming causes changes in the dynamics and distribution of populations. I used a 19-year study, in Brittany, on a long-lived and partial migrant, the Pied Avocet, to quantify and compare the demographic rates associated with different migration strategies. Survival rates and associated senescence patterns were similar in residents and in migrants, but migrants exhibited a delayed recruitment age. Reproductive investment was higher and senescence was absent in individuals recruited at the age of one year, whereas those who began to reproduce later showed reproductive senescence. The fitness of migrants was lower than the fitness of residents, which explained their decline over the study period, while the resident population remained stable. Low productivity, due to predation, caused the Brittany population to decline despite a high immigration rate, which questions local conservation policies