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Artykuły w czasopismach na temat "Habitats benthiques"
Janssen, P., P. Cavaillé, A. Vivier i A. Evette. "Le génie végétal favorise une plus grande diversité de micro-habitats aquatiques et de macro-invertébrés benthiques". Techniques Sciences Méthodes, nr 9 (wrzesień 2019): 55–64. http://dx.doi.org/10.1051/tsm/201909055.
Pełny tekst źródłade la Chenelière, Véronik, Philippe Brodeur i Marc Mingelbier. "Restauration des habitats du lac Saint-Pierre : un prérequis au rétablissement de la perchaude". Le Naturaliste canadien 138, nr 2 (16.05.2014): 50–61. http://dx.doi.org/10.7202/1025070ar.
Pełny tekst źródłaAyissi, I., M. Aksissou, M. Tiwari i J. Fretey. "Caractérisation des habitats benthiques et ponte des tortues marines autour du parc national de Campo-Ma’an (Cameroun)". International Journal of Biological and Chemical Sciences 7, nr 5 (24.03.2014): 1820. http://dx.doi.org/10.4314/ijbcs.v7i5.3.
Pełny tekst źródłaCotonnec, Adeline, Pascal Gouéry, Mouna Mokrani, Jérôme Fournier, Brice Anselme, Alain Dréau, Vincent Dubreuil, Andrea C. Panizza i Pascal Talec. "Utilisation de données SPOT5 pour la cartographie des habitats benthiques littoraux. Application à l’archipel des îles Chausey (golfe normand-breton, France)". Norois, nr 196 (1.09.2005): 37–50. http://dx.doi.org/10.4000/norois.393.
Pełny tekst źródłaWASSON, J. G., R. BONNARD i L. MARIDET. "Réponses globales des invertébrés benthiques aux conditions d'habitat physique dans des cours d'eau salmonicoles : perspectives d'intégration dans des modèles habitat/poissons". Bulletin Français de la Pêche et de la Pisciculture, nr 337-338-339 (1995): 291–99. http://dx.doi.org/10.1051/kmae:1995033.
Pełny tekst źródłaRozprawy doktorskie na temat "Habitats benthiques"
Navon, Maxime. "Hétérogénéité sédimentaire et micro-habitats benthiques : approches in situ et expérimentale". Caen, 2016. https://hal-normandie-univ.archives-ouvertes.fr/tel-01922479.
Pełny tekst źródłaThe eastern Bay of Seine is characterized by complex sediment structures with high spatial and vertical heterogeneities. Its variability involves complexes animal-sediment relationships still unclear. A new approach based on the individual scale combines in situ sampling with experiments. The macrofauna vertical distribution and quantification of biogenics structures have shown the main concentration of the fauna in the first 10 cm depth, such as 98 % of the total abundance. Two abundance pics have been observed, the first close to the surface between 0 and 2 cm depth and the other one between 5 to 7 cm depth, mainly due to two species, Kurtiella bidentata and Chaetozone spp. , which represent almost 80 % of the abundance from 5 to 7cm. Their presence within this depth is still unknown. Experiments have shown the great sediment reworking skill of the worm Lagis koreni and its ability to destroy the sediment structure, which can be linked to the in situ samples. This preliminary work has shown the interest of the technics used and makes us going further
Violet, Clément. "Approches quantitatives pour comprendre et prédire l'écologie, la distribution et la biodiversité des habitats benthiques dans l'Anthropocène". Electronic Thesis or Diss., Brest, 2023. http://www.theses.fr/2023BRES0092.
Pełny tekst źródłaThis thesis aims at better understanding and predicting coastal benthic biodiversity with a specific focus on the role of biogenic habitats in maintaining ecosystem structure and functioning. This thesis explored how different innovative and complementary numeric tools and pipelines can address these objectives at different scales: 1) joint species distribution modelling across two biogenic habitats at a regional scale, and 2) using Machine Learning approaches, defining and modelling the distribution of benthic habitats states at a global and at a national scale. These complementary approaches quantify the relative influence of the environmental and anthropogenic factors (including marine heatwaves and fishing intensity) that determinecoastal biodiversity and the state of benthic habitats. While in both case studies the predictability of the considered species or states was low, these studies have identified future avenues to optimise models inference and prediction of benthic communities. Thus, this thesis provides a critical perspective on existingapproaches available to study and characterise coastal biodiversity; and on the future developments required to better anticipate future ecological responses related to anthropogenic impacts
Foveau, Aurélie. "Habitats et communautés benthiques du bassin oriental de la Manche : état des lieux au début du XXIème siècle". Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10146/document.
Pełny tekst źródłaThis study is devoted in providing an updated knowledge on the macrobenthic community structureand biodiversity in the eastern English Channel in the early 2000s. Results obtained were compared withresults obtained by L. Cabioch and colleagues for the period of 1971-1976. The distribution of macrobenthiccommunities is highly governed by the sedimentary cover. The Folk classification was used for sedimentologyand mapping of bottom type characterization for the two study periods. A relative stability of the sedimentarycover was observed wherein 69% of the study area showed slight or no change in sedimentary cover in the last25 years. This is mainly due to the hydrodynamics in the area which is a dominant and structuring factor in theeastern English Channel. Variations were observed in bays, near the mouth of the estuaries and in the sandbank areas. The macrobenthic communities were studied separately for each period then compared. However,due to differences in methodologies applied for each period, considerable observations from comparativestudies were difficult to detect. Geographical mapping results revealed that four entities or communitiesseemed recurrent in time depending on sediment type associations: (1) average sand ; (2) coarse sand ; (3)sandy gravel and (4) pebbles. Analysis done on two latter sediment types showed that the various geographicalentities constituting associated communities are distinct at the scale of the eastern English Channel. Speciesdiversity, abundance and richness are significant with 875 taxa identified from 318 sampled sites, where thelatter is still considered underestimated. Finally, statistical methods were applied to modeling and prediction ofpotential habitats of 22 benthic invertebrates. Habitat modeling results obtained are in accordance with fieldobservations and showed that for the majority of considered species (average and fine sand-associated speciesexcluded) occupy their suitable niches/habitat
Ehrhold, Axel. "Projet REBENT : Cartographie des habitats benthiques dans les petits fonds côtiers à l'aide de méthodes acoustiques". Phd thesis, Université de Caen, 2004. http://tel.archives-ouvertes.fr/tel-00006680.
Pełny tekst źródłaLozach, Sophie. "Habitats benthiques marins du bassin oriental de la Manche : enjeux écologiques dans le contexte d’extraction de granulats marins". Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10163/document.
Pełny tekst źródłaThe natural variation in the coarse sediment benthic community was investigated over a four-year period in the context of an aggregate extraction licence project in the eastern Channel paleovalleys deposits. Six surveys were conducted: twice a year (mid-April: pre- recruitment and the end of August: post-recruitment) in 2007, 2009 and 2010. The data set obtained shows on one hand that the coarse sediment of the benthic community of the eastern English Channel paleovalleys presents an outstanding constancy over time and on another hand, it brings out new pieces of knowledge on benthic habitats typology in offshore coarse sediments (EUNIS). A complementary study on functional features showed that this benthic community has a high resistance to physical disturbance, but lower resilience. This knowledge on benthic community structure and functioning allowed the making of assumptions on the consequences of marine aggregate extraction at this site. An adaptive management of this human activity has then been proposed by the implementation of a benthic monitoring responding to ecological issues associated with marine sediment dredging. Results obtained during this study will also be a substantial input to scientific understanding of dredging impacts should the licence be delivered by French authorities
RAFFIN, Coralie. "Bases biologiques et écologiques de la conservation du milieu marin en mer d'Iroise". Phd thesis, Université de Bretagne occidentale - Brest, 2003. http://tel.archives-ouvertes.fr/tel-00005791.
Pełny tekst źródłaBoyé, Aurélien. "Diversité taxinomique et fonctionnelle des habitats benthiques dans l'espace et dans le temps : une perspective régionale et décennale Constancy despite variability: Local and regional macrofaunal diversity in intertidal seagrass beds ?, in Journal of Sea Research 130, December 2017". Thesis, Brest, 2018. http://www.theses.fr/2018BRES0110.
Pełny tekst źródłaThis thesis takes advantage of long-term monitoring data covering a regional scale to better apprehend the maindrivers of the diversity of coastal seafloors. Through consideration of multiple spatial and temporal scales and different facets o fcommunity diversity, the main objective of this work was to provide a better predictive understanding of the responses of benthic communities to environmental changes. In particular, this thesis addressed the potential consequences of the on-going homogenisation of the seafloor and the global loss of biogenic habitats, havens of diversity made by foundation species. Through comparison of two such habitats, intertidal seagrass meadows and subtidal maerl beds, with bare sediment devoid of foundationspecies, this thesis has highlighted the key role of biogenicstructures for long-term maintenance of the diversity andfunctioning of benthic communities. Indeed, these habitats mediate the dynamics and responses of benthic communities to environmental conditions, ensure a greater stability of their spatial structures at regional scale, and appeared essential for the long-term maintenance of the ecological functions benthic invertebrates are associated with. This work also highlighted that foundation species may affect benthic communities through different mechanisms, and that has implications on the structure and vulnerability of these communities. Lastly, this the sisemphasized a strong spatial and temporal stability of community richness despite important underlying changes in composition and there by stressed the need to better characterise these compositional variations to guide conservation. These variations contributed, for instance, to an unexpectedly high taxonomic and functional richness of bare sediment at regional scale,similar to those of biogenic habitats, despite being locally depauperate. Overall, broad-scale monitoring programs are fundamental assets to bridge local empirical and theoretical ecological knowledge to the broader scales at which society manage and benefits from natural ecosystems
Garcia, Clément. "Approche fonctionnelle des communautés benthiques du bassin oriental de la Manche et du sud de la mer du Nord". Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10185/document.
Pełny tekst źródłaMost of the studies concerning benthic communities in the eastern part of the English Channel and southern North Sea are descriptive, serving primarily to illustrate the specific changes in the diversity and structure of benthic communities. Only recently studies have examined benthic ecosystem functions, mainly due to difficulties in obtaining sufficient functional parameters for each benthic component (bacteria, meiofauna, macrofauna...). This work investigated whether the benthic communities of the studied area have to be considered as a single unit or as a juxtaposition of functional entities. An approach through two trophic modelling methods, inverse and Ecopath has been performed. In order to test and assess relative importance of factors supposed to influence benthic trophic structure, the study area was subdivided into units defined a priori according to two main structural factors of community distribution: geographical (bay of Seine, eastern Channel and North Sea) and sedimentary patterns (gravel and pebbles, coarse sand and fine sand). Comparisons of model outputs of each division highlighted the key role of suspension organism in flow transfer among the trophic web. It also showed different properties between the divisions. Benthic trophic functioning seems to be strongly correlated with the sediment to which it belongs. Finally, a preliminary approach assessing biological trait diversity of benthic invertebrates has been performed. Information concerning 21 biological traits on 631 species has been gathered. It allowed us to have a global view of diversity and dominance of the functional attributes in the study area
Petit, Tristan. "Caractérisation des fonds marins et estimation bathymétrique par inversion de modèle de transfert radiatif : application à l'imagerie hyperspectrale en milieu coralien". Thesis, Brest, 2017. http://www.theses.fr/2017BRES0023/document.
Pełny tekst źródłaAirborne hyperspectral imaging is a potential candidate for mapping and monitoring coral reefs at large scale and with high spatial resolution. In this thesis, we first present the processing steps to be applied to hyperspectral signals for extracting information about seabed types, bathymetry and water optical properties, and we discuss their efficiency with respect to two main confounding factors: (i) low signal to noise ratio of the measured signals, and (ii) large number and variability of physical interactions occurring between the entrance of sunlight into the atmosphere and its measurement by the hyperspectral sensor. Considering these limitations, we examine the performance of an already existing water column processing method: semi-analytical model inversion by optimization. We first evaluate the robustness of seabed type and bathymetry estimation for six different inversion setups. The results on hyperspectral images acquired over Réunion Island reefs in 2009 show that the choice of the inversion setup plays an important role on the quality of the estimations and that the most widely used inversion setup does not always produce the best results. We then evaluate the importance of the accuracy of the parameterization of the direct semi-analytical model. This is done through a sensitivity analysis performed on both simulated and real hyperspectral data acquired in Réunion Island in 2015. The analysis is performed for each inversion setup previously studied. This study shows that in coral reef context the accuracy of the parameterization of the direct model is less important than the choice of the inversion setup. We also demonstrate that it is not possible to identify the most influent parameters of the direct model because it depends on the relative concentration of each optically active constituent
Kostecki, Caroline. "Dynamique trophique, habitat benthique et fonction de nourricerie des milieux côtiers et estuariens". Rennes, Agrocampus Ouest, 2010. http://www.theses.fr/2010NSARH081.
Pełny tekst źródłaFor a large proportion of flatfish species, and especially common sole and plaice, juveniles grow in restricted coastal and estuarine nursery grounds during their first years of life. Once their sexual maturity reached, they move to more extended adults habitat located on the continental shelf and contribute to the reproduction. Nursery grounds area depends on freshwater inputs which enhance the juvenile distribution to the open sea and the recruitment. The link between organic matter sources, benthic invertebrates populations that constitute their food supply and flatfish juveniles is complex and remains poorly known. Trophic and spatial interactions between these components have thus been investigated in two contrasted nursery grounds : the Vilaine estuary and the Mont-Saint-Michel bay. The first part of this project aimed to describe flatfish juveniles benthic food web using stable isotopes and gut contents analyses. Carbon stable isotope signatures in common sole juvenile in the vilaine estuary showed the incorporation of terrigenous organic matter into their benthic food wed. Furthermore, this assimilation varied according to Vilaine river flow. Conversely, the Mont-Saint-Michel bay receives little freshwater inputs, but supports an important nursery ground for plaice and common sole. In this nursery ground, microphytobenthos produced on the wide intertidal mudflats mainly contributed to flatfish juveniles food web. Combined utilisation of bot stable isotopes and gut contents analyses thus improved coastal and estuarine nursery grounds description : these analyses particularly pointed out the terrigeneous organic matter role and benthic diatoms production in the flatfish nursery grounds trophic functioning and the spatio-temporal variability of the respective influence of these two sources
Raporty organizacyjne na temat "Habitats benthiques"
Munro, J., C. Grant, L. Provencher i F. Roy. Les habitats benthiques de la ZPM Manicouagan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2007. http://dx.doi.org/10.4095/224416.
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