Academic literature on the topic 'Baleines à bec – Observations'
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Journal articles on the topic "Baleines à bec – Observations"
Gérard, Odile, Craig Carthel, and Stefano Coraluppi. "Détection et classification automatique de signaux acoustiques de baleines à bec." Traitement du signal 33, no. 1 (October 28, 2016): 73–94. http://dx.doi.org/10.3166/ts.33.73-94.
Full textKun, E., Z. Keresztes, and L. Á. Gergely. "Slowly rotating Bose–Einstein condensate compared with the rotation curves of 12 dwarf galaxies." Astronomy & Astrophysics 633 (January 2020): A75. http://dx.doi.org/10.1051/0004-6361/201936504.
Full textMorawska, Alina, Michelle Adamson, and Joanne Ferriol Especkerman. "Mealtime Observations and Parent-Report: Correspondence Across Measurement and Implications for Intervention." Behaviour Change 32, no. 3 (July 27, 2015): 175–89. http://dx.doi.org/10.1017/bec.2015.9.
Full textDavis, Benjamin, Xuguang Wang, and Xu Lu. "A Comparison of HWRF Six-Hourly 4DEnVar and Hourly 3DEnVar Assimilation of Inner Core Tail Dopper Radar Observations for the Prediction of Hurricane Edouard (2014)." Atmosphere 12, no. 8 (July 22, 2021): 942. http://dx.doi.org/10.3390/atmos12080942.
Full textKim, Sung-Min, and Hyun Mee Kim. "Forecast Sensitivity Observation Impact in the 4DVAR and Hybrid-4DVAR Data Assimilation Systems." Journal of Atmospheric and Oceanic Technology 36, no. 8 (August 2019): 1563–75. http://dx.doi.org/10.1175/jtech-d-18-0240.1.
Full textBarthelemy, Dominique. "Une crise de l’écrit ? Observations sur des actes de Saint-Aubin d’Angers (XIe siècle)." Bibliothèque de l'école des chartes 155, no. 1 (1997): 95–117. http://dx.doi.org/10.3406/bec.1997.450860.
Full textCastellanos, Elías, Celia Escamilla-Rivera, and Jorge Mastache. "Is a Bose–Einstein condensate a good candidate for dark matter? A test with galaxy rotation curves." International Journal of Modern Physics D 29, no. 09 (July 2020): 2050063. http://dx.doi.org/10.1142/s0218271820500637.
Full textKay, Junkyung, and Xuguang Wang. "A Multiresolution Ensemble Hybrid 4DEnVar for Global Numerical Prediction." Monthly Weather Review 148, no. 2 (February 1, 2020): 825–47. http://dx.doi.org/10.1175/mwr-d-19-0002.1.
Full textHorne, David James de Lancy. "The Emergence and Development of Cognitive Behaviour Therapy in Australia: Observations from an Early Player." Behaviour Change 36, no. 4 (November 29, 2019): 192–99. http://dx.doi.org/10.1017/bec.2019.18.
Full textXie, Jiping, Roshin P. Raj, Laurent Bertino, Annette Samuelsen, and Tsuyoshi Wakamatsu. "Evaluation of Arctic Ocean surface salinities from the Soil Moisture and Ocean Salinity (SMOS) mission against a regional reanalysis and in situ data." Ocean Science 15, no. 5 (September 6, 2019): 1191–206. http://dx.doi.org/10.5194/os-15-1191-2019.
Full textDissertations / Theses on the topic "Baleines à bec – Observations"
Tournier, Martin. "Caractérisation et modélisation de l’habitat physique et biologique vertical des mammifères marins grands plongeurs." Thesis, La Rochelle, 2022. http://www.theses.fr/2022LAROS018.
Full textDeep-diving mammals evolve within a tri-dimensional environment where the physical and biological conditions vary. These variations can influence their utilization of the vertical dimension. This Ph.D. thesis focuses, first, on acoustic signal analysis, the signal being sampled by a miniaturized echo-sounder deployed on southern elephant seals, and aims at biologically describing the water column. Through that acoustic signal, mid-trophic level organisms have been observed, as well as important particle export. Second, to determine the influence of dynamic environmental variables, such as temperature or salinity, on the vertical position of elephant seals and Blainville’s beaked whales, we proposed a new methodology suitable for using environmental predictors described in the form of profiles by using functional analysis approaches. When using the variables obtained in situ by elephant seals, we show that the environmental profiles influence the depth of the dives. However, the model tends to underestimate the predicted depth of animals, mainly in areas where high oceanic dynamics are observed. When using the same approach on the restricted beaked whales’ dataset, and by using environmental variables obtained from oceanographic models, we did not observe any impact of the environmental conditions on the whales’ water column use. This methodological approach could allow the integration of the vertical dimension toward the development of tri-dimensional habitat modelling under the conditions that the spatial and temporal resolutions of the dataset are adequate
Virgili, Auriane. "Modelling distributions of rare marine species : the deep-diving cetaceans." Thesis, La Rochelle, 2018. http://www.theses.fr/2018LAROS003/document.
Full textDeep-diving cetaceans, sperm- and beaked whales Physeteridae, Kogiidae and Ziphiidae, are rare marine species. Due to their low densities, wide distribution ranges and limited presence at the water surface, visual surveys usually result in low sighting rates. This paucity of data challenges the modelling of their habitat, prerequisite for their conservation. Models have to cope with a great number of zeros that weakens the ability to make sound ecological inferences. Consequently, this thesis aimed at finding a methodology suitable for datasets with a large number of zeros, determining how environmental variables influence deep-diver distributions and predicting areas preferentially used by these species. By testing the predictive performance of various habitat models fitted to decreasing numbers of sightings, I selected the most suitable model and determined that at least 50 sightings were needed to provide reliable predictions. However, individual surveys can rarely provide sufficient deep-diver sightings thus I merged many visual survey datasets to produce the first basin-wide deep-diver density maps in the North Atlantic Ocean and the Mediterranean Sea. Highest densities were predicted in waters from 1500-4000 m deep and close to thermal fronts ; hotspots were predicted along the continental slopes, particularly in the western North Atlantic Ocean. In addition, a model transferability analysis highlighted that habitat drivers selected by the models varied between contrasted large ecosystems. Finally, I discussed challenges related to statistical modelling applied to rare species and the management applications of this thesis
Patris, Julie. "Contributions en méthodes pour le suivi de mysticètes par acoustique passive." Electronic Thesis or Diss., Toulon, 2019. http://www.theses.fr/2019TOUL0016.
Full textPassive acoustic monitoring has a growing importance in marine mammals studies. This work is concerned with the largest of marine mammals, the blue whale (Balaenoptera musculus). We obtained a new corpus of acoustic data in the northern part of Chile, in the Humboldt archipelago. We show the presence of a song characteristic of the 'Chilean' blue whale, formerly described in southern Chile and Galapagos islands. Based on this sang type, we propose new methods of analysing and classifying pulsed sounds. Using the fundamental frequency thus obtained, we analyse the blue whale's sang, showing a general evolution of the frequency on a decadal scale. We also construct a method of monohydrophone source localisation based on high performance simulation of the acoustic wave field, by spectral elements methods. We conclude emphasizing on the importance of bioacoustic for monitoring the marine world
Martins, Cristiane C. A. "Study of baleen whales’ ecology and interaction with maritime traffic activities to support management of a complex socio-ecological system." Thèse, 2012. http://hdl.handle.net/1866/10799.
Full textManagement of the marine environment for multiple usages has become increasingly complex. The creation of Marine Protected Areas (MPAs) has been pointed out as a successful strategy for combining conservation with other uses. However, to attain conservation goals, a well-defined management plan and a robust monitoring program need to be set. In 1998, the Saguenay St. Lawrence Marine Park (SSLMP) was decreed to protect important ecosystems of the St. Lawrence River Estuary. A growing whale watching industry was already established in the area which is also crossed by an important shipping lane. Thirteen marine mammal species occur in the area, among them, four baleen species, which are the focus of the present work: minke whales (Balaenoptera acutorostrata), fin whales (Balaenoptera physalus), humpback whales (Megaptera novaeangliae) and the blue whales (Balaenoptera musculus). Whales’ protection in this area of intensive marine traffic is of concern due to a high collision probability and induced behavioral and physiological changes. Before addressing the effects of the marine traffic, some basic questions needed to be answered: How many baleen whales use the area? Where are their core areas? To answer that, line-transect distance-sampling data collected over four years (2006-2009) were used to estimate density and abundance and to build a spatial density model (SDM). The most abundant species were minke (45, 95% CI=34-59) and fin whales (24, 95% CI=18-34), followed by blue (3, 95% CI=2-5) and humpback whales (2, 95% CI=1-4). Generalized additive models were used to model each species count as a function of space and environmental variables. The SDM allowed the identification of each species core area within the marine portion of the SSLMP, and corroborated the abundance estimates derived from design-based methods. In addition, it corroborated the relevance of the proposed St. Lawrence Estuary Marine Protected (SLEMPA) Area to the conservation of essential habitats of the endangered blue whale. An extrapolation exercise was performed to predict blue whales’ habitats outside the surveyed area. Despite its exploratory nature, the results showed a good match with independent data sets and in the lack of better information could guide the discussion of management measures to enhance species’ protection. Next, Geographic Information System capabilities were used to verify the degree of overlap between the navigation corridor and the resulting SDM of each species and the extrapolation model. The analysis highlighted areas of important co-occurrence of whales and ships, corroborated the adequacy of recently proposed management measures and resulted in a recommendation of adjustment to the current shipping lane in order to decrease collision risk. Finally, the overlap with the whale watching industry was characterized with data from a land-based survey conducted from 2008 to 2010. Although all baleen whale species were tracked, here only results of blue and humpback whales were presented. For blue whales, data from 14 hours of observation were analyzed. Whales were exposed to boats, mainly commercial zodiacs, in 74% of their surface intervals (SI). Continuous exposure ranged from 2 to 19 SI and the mean number of boats within a 1 km radius was 2.3 (±2.7, max=14). A complete lack of compliance with the current whale watching regulations was observed. Additionally, individual blow rate variance was correlated with percentage of exposure to boats (0.73, p<0.05). Although humpback whales do not have a critical conservation status, their intrinsic behaviour makes them a major target to the industry. A total of 50.4 hours of humpback whale observation was analysed. Whales were exposed to boats, mainly commercial zodiacs, during 78.5% of the observation time. The mean number of boats within a 1 km radius was 1.9 (±2.3, max=22). The cumulative exposure to whale watching can have long-term consequences for whales. Law enforcement and measures to raise awareness and compliance to current regulations are urgently needed. Suggestions to improve the current regulation were provided. The present work presents the first abundance estimates for the study area, refines the available information on baleen whales core areas, provides support to the establishment of an adequate zoning plan within the SSLMP and stresses the relevance of the SLEMPA. In addition it provides an in depth overview of the marine traffic issue and provides valuable information to support management of this complex socio-ecological system.
Thesis written in co-mentorship with Robert Michaud.
Book chapters on the topic "Baleines à bec – Observations"
Leggett, A. J., and S. Zhang. "The BEC–BCS Crossover: Some History and Some General Observations." In The BCS-BEC Crossover and the Unitary Fermi Gas, 33–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21978-8_2.
Full textConference papers on the topic "Baleines à bec – Observations"
Ainomae, Ahti, Tonu Trump, and Yannick Le Moullec. "Distributed Adaptive Largest Eigenvalue Detection with SNR Weighted Observations." In 2018 16th Biennial Baltic Electronics Conference (BEC). IEEE, 2018. http://dx.doi.org/10.1109/bec.2018.8600974.
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