324,224 research outputs found
The Role Of Geomagnetic Cues In Green Turtle Open Sea Navigation
No full textISI Document Delivery No.: 841NR Times Cited: 2 Cited Reference Count: 40 Cited References: BENHAMOU S, 1994, ANIM BEHAV, V47, P1423, DOI 10.1006/anbe.1994.1189 Benhamou S, 2003, ANIM BEHAV, V65, P729, DOI 10.1006/anbe.2003.2092 Benhamou S, 2003, BEHAV PROCESS, V61, P95, DOI 10.1016/S0376-6357(02)00168-7 Benhamou S., 2010, ENCY BEHAV NEUROCIEN, V2, P497, DOI [10.10161B978-0-08-045396-5.00106-8, DOI 10.1016/B978-0-08-045396-5.00106-8] Benhamou S, 1996, ANIM BEHAV, V52, P201, DOI 10.1006/anbe.1996.0165 Benhamou S, 2003, J THEOR BIOL, V225, P235, DOI 10.1016/S0022-5193(03)00242-X BENHAMOU S, 1992, ANIM BEHAV, V43, P371, DOI 10.1016/S0003-3472(05)80097-1 Benhamou S, 2006, ECOLOGY, V87, P518, DOI 10.1890/05-0495 Benhamou S, 2004, J THEOR BIOL, V229, P209, DOI 10.1016/j.jtbi.2004.03.016 Bingman VP, 2005, ETHOL ECOL EVOL, V17, P295 Bonadonna F, 2005, P ROY SOC B-BIOL SCI, V272, P489, DOI 10.1098/rspb.2004.2984 Bourjea Jerome, 2007, Endangered Species Research, V3, P273, DOI 10.3354/esr00053 Bowen Brian W., 1996, P190 Codling EA, 2008, J R SOC INTERFACE, V5, P813, DOI 10.1098/rsif.2008.0014 Flemming JEM, 2006, ENVIRONMETRICS, V17, P351, DOI 10.1002/env.774 Girard C, 2006, MAR ECOL PROG SER, V322, P281, DOI 10.3354/meps322281 Hays GC, 2010, CONSERV BIOL, V24, P1636, DOI 10.1111/j.1523-1739.2010.01531.x Hays GC, 2001, J EXP BIOL, V204, P4093 Hays GC, 2003, P ROY SOC B-BIOL SCI, V270, pS5, DOI 10.1098/rsbl.2003.0022 Johnsen S, 2008, PHYS TODAY, V61, P29, DOI 10.1063/1.2897947 KENDALL DG, 1974, J ROY STAT SOC B MET, V36, P365 Lohmann KJ, 2008, J EXP MAR BIOL ECOL, V356, P83, DOI 10.1016/j.jembe.2007.12.017 Lohmann KJ, 2008, P NATL ACAD SCI USA, V105, P19096, DOI 10.1073/pnas.0801859105 Luschi P, 2007, CURR BIOL, V17, P126, DOI 10.1016/j.cub.2006.11.062 Luschi P, 2001, BEHAV ECOL SOCIOBIOL, V50, P528, DOI 10.1007/s002650100396 Mancho AM, 2006, COMPUT FLUIDS, V35, P416, DOI 10.1016/j.compfluid.2005.02.003 Maus S, 2007, GEOCHEM GEOPHY GEOSY, V8, DOI 10.1029/2007GC001643 MEYLAN AB, 1990, SCIENCE, V248, P724, DOI 10.1126/science.2333522 NORMAN JA, 1994, MOL ECOL, V3, P363, DOI 10.1111/j.1365-294X.1994.tb00076.x Papi F, 2000, J EXP BIOL, V203, P3435 Rio MH, 2011, J GEOPHYS RES-OCEANS, V116, DOI 10.1029/2010JC006505 Sudre J, 2008, OCEAN DYNAM, V58, P101, DOI 10.1007/s10236-008-0134-9 Thebault E, 2010, SPACE SCI REV, V155, P95, DOI 10.1007/s11214-010-9667-6 Thomas UN., 2008, GEOPHYS MONOGR SER, V177, P17, DOI [DOI 10.1029/177GM04, 10.1029/177GM04] Turiel A, 1998, PHYS REV LETT, V80, P1098, DOI 10.1103/PhysRevLett.80.1098 Turiel A, 2008, J PHYS A-MATH THEOR, V41, DOI 10.1088/1751-8113/41/1/015501 Wallraff HG, 2004, ANIM BEHAV, V67, P189, DOI 10.1016/j.anbehav.2003.06.007 Wiltschko R, 2006, BIOESSAYS, V28, P157, DOI 10.1002/bies.20363 Wyneken J., 2001, NMFSSEFSC470 NOAA Yahia H, 2010, PATTERN RECOGN, V43, P3591, DOI 10.1016/j.patcog.2010.04.011 Benhamou, Simon Sudre, Joel Bourjea, Jerome Ciccione, Stephane De Santis, Angelo Luschi, Paolo Agence nationale de la Recherche [ANR-07-BLAN-0220-01] The work was funded by Agence nationale de la Recherche http://www.agence-nationale-recherche.fr/, Programme ESTVOI (ANR-07-BLAN-0220-01). The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. 2 PUBLIC LIBRARY SCIENCE SAN FRANCISCO PLOS ONEBackground: Laboratory and field experiments have provided evidence that sea turtles use geomagnetic cues to navigate in the open sea. For instance, green turtles (Chelonia mydas) displaced 100 km away from their nesting site were impaired in returning home when carrying a strong magnet glued on the head. However, the actual role of geomagnetic cues remains unclear, since magnetically treated green turtles can perform large scale (> 2000 km) post-nesting migrations no differently from controls. Methodology/Principal Findings: In the present homing experiment, 24 green turtles were displaced 200 km away from their nesting site on an oceanic island, and tracked, for the first time in this type of experiment, with Global Positioning System (GPS), which is able to provide much more frequent and accurate locations than previously used tracking methods. Eight turtles were magnetically treated for 24-48 h on the nesting beach prior to displacement, and another eight turtles had a magnet glued on the head at the release site. The last eight turtles were used as controls. Detailed analyses of water masses-related (i.e., current-corrected) homing paths showed that magnetically treated turtles were able to navigate toward their nesting site as efficiently as controls, but those carrying magnets were significantly impaired once they arrived within 50 km of home. Conclusions/Significance: While green turtles do not seem to need geomagnetic cues to navigate far from the goal, these cues become necessary when turtles get closer to home. As the very last part of the homing trip (within a few kilometers of home) likely depends on non-magnetic cues, our results suggest that magnetic cues play a key role in sea turtle navigation at an intermediate scale by bridging the gap between large and small scale navigational processes, which both appear to depend on non-magnetic cues
C.-L. Benhamou, J.-S. Giraudet, M. Dougados La rédaction médicale : une technique de communication scientifique
No full textTimbal-Duclaux Louis. C.-L. Benhamou, J.-S. Giraudet, M. Dougados La rédaction médicale : une technique de communication scientifique . In: Communication et langages, n°86, 4ème trimestre 1990. p. 126
Etude paléontologique et dynamique d'un intervalle condensé à gastropodes dans les calcaires à grands bivalves du Pleinsbachien del'Ouarsenis (Tell, Algérie)
No full textInfluence des événements tectono-sédimentaires sur l’évolution des foraminifères du Lias-Dogger dans la région d’Aïn Ouarka (Atlas saharien, Algérie)
No full textSebane Abbès, Mekahli Larbi, Benhamou Miloud, Tchenar S. Influence des événements tectono-sédimentaires sur l’évolution des foraminifères du Lias-Dogger dans la région d’Aïn Ouarka (Atlas saharien, Algérie). In: Documents des Laboratoires de Géologie, Lyon, n°156, 2002. STRATI 2002. 3ème congrès français de stratigraphie. Lyon, 8-10 juillet 2002. pp. 210-211
Etude paléontologique et dynamique d'un intervalle condensé à gastropodes dans les calcaires à grands bivalves du Pliensbachien (Ouarsenis, Algérie)
No full textThe large bivalve limestones of the Grand Pic de l'Ouarsenis have yielded a gastropod fauna attributed to the Middle Carixian (Lower Pliensbachian) by Metaderoceras sp. and to the Cl biozone of the benthic foraminifer chart. Its palaeontological study allows to recognize and to describe eight species belonging to seven different superfamilies, despite their poor state of preservation. Some taxa are known on both sides of the Tethys (northwestern and maghrebian margins). The environmental setting of the Ouarsenis fauna is mainly controlled by an insular palaeotopography and by autocyciclic processes (tectonic and hydrodynamism). The deposit of the gastropod fauna has occurred during the transgressive phase of a 3rd order sequence (condensed interval sensu Vail et al., 1991). These events, occurring during the Late Carixian times, are well documented along the south-tellian border. The eustatic deepening is complicated by the local tilted-blocks tectonics. In these conditions, the gastropods level has been deposited in a weak sedimentation rate setting and its environment is located to the upper part of the photic zone and subjected to low hydrodynamic conditions. The marine waters were warm, calm, with a normal salinity
Diderot et l'enseignement de Jacques-Louis David
No full textReed Benhamou : Diderot an the Teaching of Jacques-Louis David.
Although no direct evidence links J.-L. David to Diderot, it was commonly believed in the 19th Century that a master-pupil relationship existed between them ; they may have met when David lived with Diderot's friend Michel-Jean Sedaine. Although art historians have been interested in the possibility that Diderot influenced David 's development as an artist, the possibility, discussed in this article, that Diderot influenced David 's approach to teaching art, is largely unexplored. By comparing the ideal art academy, described in Diderot's Essais sur la peinture, to the training offered by David to his pupils, we demonstrate not only that David's language of instruction reflected many of Diderot's themes and expressions, but also that David's approach so resembled Diderot's as to suggest that he implemented the plan provided by the Philosophe.Reed Benhamou : Diderot et l'enseignement de Jacques-Louis David.
Nous n'avons aucune preuve d'un lien entre J.-L. David et Diderot, mais au XIXe siècle on croyait qu'il existait un rapport de maître à élève entre les deux hommes. Ils auraient pu se rencontrer quand David habitait chez Michel-Jean Sedaine, l'ami de Diderot. Les historiens de l'art se sont intéressés à une possible influence de Diderot sur le développement artistique de David mais ce qui nous intéresse ici, c'est l'hypothèse peu envisagée jusqu'à maintenant selon laquelle Diderot ait joué un rôle dans la méthode d'enseignement de David. En effet, si nous comparons l'académie d'art idéale décrite dans les Essais sur la peinture à l'atelier de David, nous constatons non seulement que le langage employé par David reprend beaucoup de thèmes et même d'expressions de Diderot, mais encore que sa pédagogie ressemble de si près à celle de Diderot qu'on est en droit de penser qu'il met en pratique le projet du Philosophe.Benhamou Reed. Diderot et l'enseignement de Jacques-Louis David. In: Recherches sur Diderot et sur l'Encyclopédie, n°22, 1997. pp. 71-86
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Homing in green turtles (Chelonia mydas): do oceanic currents act as a constraint or as an information source?
No full textAs open sea navigators, green turtles Chelonia mydas have to deal with oceanic cur- rents. These currents may have a mechanical influence, forcing turtles away from their desired course, but they may also provide information to navigating turtles by bringing chemical cues down- current from their target area. In the present paper, we have introduced new path analysis methods, coupling remote-sensing oceanographic data and satellite-tracking data in order to test these hypotheses. These methods were exemplified on the homing routes of 3 green turtles nesting on Europa, an isolated island in the southern part of Mozambique Channel. The turtles, displaced by ship east-southeast from Europa, returned to their nesting island in 13 to 59 d, following long, circuitous routes, and hence apparently displaying poor navigational abilities. Path analysis showed that turtles were unable to compensate for the deflecting action of currents, which moved them away from their intended course and lowered their orientation performance. At large distances from Europa, green turtles did not appear to find navigational information in water masses that had previously been in contact with their target are
Navigational performances of magnetically-disturbed green sea turtles subjected to experimental displacement
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