References of "Clément, Gaël"
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See detailFlora and fauna from a new Famennian (Upper Devonian) locality at Becco, eastern Belgium
Olive, Sébastien; Clément, Gaël; Denayer, Julien ULg et al

in Geologica Belgica (2015), 18(2-4), 92-101

The Becco locality (Liège province), belongs to the Theux tectonic window and represents a proximal, probably fluvial, environment corresponding to a channel infill. We present here a preliminary report ... [more ▼]

The Becco locality (Liège province), belongs to the Theux tectonic window and represents a proximal, probably fluvial, environment corresponding to a channel infill. We present here a preliminary report of the fossil assemblage discovered at the locality. The Becco site has yielded a diverse flora of early seed plants including Moresnetia zalesskyi, Dorinnotheca streeli and Condrusia sp. This assemblage, characteristic of the Belgian Famennian, highlights the diversity of early spermatophytes in the country. Becco has also delivered a rich vertebrate fauna with antiarch, groenlandaspid and phyllolepid placoderms, diplacanthiform acanthodians, as well as actinopterygians and various sarcopterygians. The fossiliferous assemblage of Becco resembles those of several Devonian tetrapod- bearing localities, including that of Strud in Belgium, and could therefore provide a favorable palaeoecological setting in the search for early tetrapods. [less ▲]

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See detailEnvironmental constraints drive the partitioning of the soundscape in fishes
Ruppé, Laetitia; Clément, Gaël; Herrel, Anthony et al

in Proceedings of the National Academy of Sciences of the United States of America (2015)

The underwater environment is more and more being depicted as particularly noisy, and the inventory of calling fishes is continuously increasing. However, it currently remains unknown how species share ... [more ▼]

The underwater environment is more and more being depicted as particularly noisy, and the inventory of calling fishes is continuously increasing. However, it currently remains unknown how species share the soundscape and are able to communicate without misinterpreting the messages. Different mechanisms of interference avoidance have been documented in birds, mammals, and frogs, but little is known about interference avoidance in fishes. How fish thus partition the soundscape underwater remains unknown, as acoustic communication and its organization have never been studied at the level of fish communities. In this study, passive acoustic recordings were used to inventory sounds produced in a fish community (120 m depth) in an attempt to understand how different species partition the acoustic environment. We uncovered an important diversity of fish sounds, and 16 of the 37 different sounds recorded were sufficiently abundant to use in a quantitative analysis. We show that sonic activity allows a clear distinction between a diurnal and a nocturnal group of fishes. Moreover, frequencies of signals made during the day overlap, whereas there is a clear distinction between the different representatives of the nocturnal callers because of a lack of overlap in sound frequency. This first demonstration, to our knowledge, of interference avoidance in a fish community can be understood by the way sounds are used. In diurnal species, sounds are mostly used to support visual display, whereas nocturnal species are generally deprived of visual cues, resulting in acoustic constraints being more important. [less ▲]

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See detailStratigraphy and depositionnal settings of the Late Famennian of Southern Belgium - a snapshot of the palaeoenvironment for late Devonian tetrapods and arthropods
Denayer, Julien ULg; Prestianni, Cyrille; Olive, Sébastien et al

in 4th International Palaeontological Congress, Mendoza, Abstracts volume (2014)

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See detailGarrouste et al. reply
Garrouste, Romain; Clément, Gaël; Nel, Patricia et al

in Nature (2013), 488

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See detailA complete insect from the Late Devonian period
Garrouste, Romain; Clément, Gaël; Nel, Patricial et al

in Nature (2012), 488

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See detaila complete insect from the Late Devonian period - supplementary information
Garrouste, Romain; Clément, Gaël; Nel, Patricia et al

in Nature (2012)

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See detailFirst occurrence of the lungfish Sagenodus (Dipnoi, Sarcopterygii) from the Carboniferous Lagerstätte of Montceau-les-Mines, France
Olive, Sébastien ULg; Clément, Gaël; Pouillon, Jean-Marc

in Journal of Vertebrate Paleontology (2012), 32(2), 285-295

New material of the dipnoan genus Sagenodus is described from the Carboniferous Lagerstätte of Montceau-les-Mines, Massif Central, France. This is the first occurrence of this lungfish in France, thus ... [more ▼]

New material of the dipnoan genus Sagenodus is described from the Carboniferous Lagerstätte of Montceau-les-Mines, Massif Central, France. This is the first occurrence of this lungfish in France, thus enlarging its worldwide distribution; and the first occurrence of a lungfish in Montceau-les-Mines, thus increasing the vertebrate taxa list of this Lagerstätte. This material is Stephanian B in age, the previously established geological range of this Euramerican genus. Remains consist of skull, lower jaw, operculum, and shoulder girdle elements closely set together with several ribs. This material, here considered as belonging to a single disarticulated specimen, shows strong affinities with the material of Sagenodus sp. from Germany and appears significantly different from all other known species of Sagenodus by the shape and ridge pattern of the upper tooth plate. However, this new material can only be attributed to Sagenodus sp. due to its incompleteness. In the literature, Montceau-les-Mines is either interpreted as a freshwater environment or as a coastal marine to marine-influenced environment. As Sagenodus is a euryhaline genus; its presence in this locality does not bring arguments to one or the other assumption. The strong affinities, existing between the material from France and Germany, indicate that there were solid hydrographic links between both basins during the Stephanian B–Upper Rotliegend period. [less ▲]

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See detailThe Middle Devonian plant assemblage from Dechra Aït Abdallah (Central Morocco) revisited
Prestianni, Cyrille; Meyer-Berthaud, Brigitte; Blanchard, Romain et al

in Review of Palaeobotany and Palynology (2012), 179

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See detailPalaeoichthyological investigation in the Luga area of Leningrad Region: past and present
Ivanov, Alexander; Lebedev, Oleg; Clément, Gaël et al

in Lebedev, Oleg; Ivanov, Alexander (Eds.) Palaeozoic Early Vertebrates II - Obruchev Symposium - Abstracts (2011)

A list of Devonian vertebrates from the Luga District of the Leningrad Region (Russia) was originally mentioned by P. N. Venyukov (1884). However, detailed palaeoichthyological studies in this territory ... [more ▼]

A list of Devonian vertebrates from the Luga District of the Leningrad Region (Russia) was originally mentioned by P. N. Venyukov (1884). However, detailed palaeoichthyological studies in this territory started in only during 1926-1931 in the framework of the geological mapping programme. Two field crews studied the sections of the Middle and Upper Devonian by the Luga, Lemovzha, Oredezh, Tesovaya and Vruda rivers. One of the teams was the Devonian Lithological expedition under guided by R. F. Hecher. D. V. Obruchev was also involved in the works of this expedition. Other team headed by B. P. Asatkin surveyed the western part of the Leningrad Region. Both teams sampled numerous outcrops and boreholes, and collected abundant vertebrate remains. As a result the Devonian deposits were subdivided into the regional beds characterized by diverse vertebrate assemblages. Collectioning and research of Devonian vertebrates in this area continued in the 1950-1960ties by D. V. Obruchev and his students: V. N. Karatajute-Talimaa, E. Mark-Kurik, L. A. Lyarskaya. Their descriptions of Eifelian-Frasnian agnathans and fishes were published in the series of monographs or papers (e.g. Karatajute-Talimaa, 1963, Obruchev & Mark-Kurik, 1965, Lyarskaya, 1981). During the last thirty years J. Valiukevicius and some of the authors of the present report supplemented the vertebrate collections from some sections. The new localities in this area were reported by the 2001 Latvian-Russian Expedition (A. Ivanov, E. Luksevics, I. Zupins and others). The 2009-2010 Russo-Franco-Latvian expedition discovered a new diverse material from the historical and new localities of that area. [less ▲]

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See detail2009-2010 Russo-franco-latvian expeditions in the Main Devonian Field (North-western Russia)
Olive, Sébastien ULg; Lebedev, Oleg; Ivanov, Alexander et al

in Lebedev, Oleg; Ivanov, Alexander (Eds.) Palaeozoic Early Vertebrates II - Obruchev Symposium - Abstracts (2011)

In the frame of an international project between the Paleontological Institute of Moscow and the Museum of Paris, a Russo-Franco-Latvian team has been set up to prospect the Main Devonian Field in North ... [more ▼]

In the frame of an international project between the Paleontological Institute of Moscow and the Museum of Paris, a Russo-Franco-Latvian team has been set up to prospect the Main Devonian Field in North-Western Russia (Novgorod and Leningrad Regions). This joined project started in 2009 (one month of field trip), continued in 2010 (one month also) and will end in 2011. The two first years were mainly devoted to the prospecting of historical localities, some discovered and/or exploited by Dmitry Obruchev himself. Such a method is effective but quite time-consuming; i.e. to rediscover the accurate location of the localities by discussing with denizens, to fathom the archives out and to access to non-weathered layers by removing the altered surface. Novgorod and Leningrad Regions are topographically excessively flat. Devonian fields have not been disrupted by tectonic movements and the layers are thus horizontal. Rocks are most often quite unconsolidated (consisting of loose sands or clays) and excavations are thus relatively easy. The lack of relief and the vegetal cover unfortunately lead to few outcrops in the landscape. They are all located along rivers (Lovat’, Syas' and Oredesh rivers for instance) or are represented by outliers. Although most of the localities were easily accessible by cars, others required several kilometers by feet and/or by boat. Roughly 30 localities have been prospected. About one third of them are very interesting such as Borshovo and Goryn' (Luga District) which provided numerous and exquisite fossils of placoderms, agnathans and sarcopterygians. The original locality of the Frasnian tetrapod Obruchevichthys in Russia, Sondala (Leningrad Region), has been rediscovered with near certainty. [less ▲]

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See detailFirst occurrence of the lungfish Sagenodus (Dipnoi, Sarcopterygii) from the Carboniferous Lagerstätte of Montceau-les-Mines, France
Olive, Sébastien ULg; Clément, Gaël; Pouillon, Jean-Marc

in Ichthyolith Issues (2011)

New material of the dipnoan genus Sagenodus is described from the Carboniferous of the Barrat quarry (Blanzy-Creuzot coal basin, Montceau-les-Mines, France). This is the first occurrence of this lungfish ... [more ▼]

New material of the dipnoan genus Sagenodus is described from the Carboniferous of the Barrat quarry (Blanzy-Creuzot coal basin, Montceau-les-Mines, France). This is the first occurrence of this lungfish in France, which enlarges its distribution within Europe (Fritsch, 1888; Schultze, 1993; Watson and Gill, 1923). This material is Stephanian B in age, the previously established geological range of this Euramerican (Schultze and Chorn, 1997) genus. Remains consist of skull, lower jaw and shoulder girdle elements, closely set together with many ribs. This material, considered as belonging to a single disarticulated specimen, presents affinities with the material of Sagenodus sp. from Germany (Schultze, 1993) and appears significantly different to all other known Sagenodus species. However this new material can only be attributed to Sagenodus sp. because of its incompleteness. Montceau-les-Mines is interpreted as a freshwater environment deposit and the presence of Sagenodus in this locality confirms that most of the localities of Sagenodus are freshwater deposits. The strong affinities, existing between the material from France and Germany, indicate that there were solid hydrographic links between both basins during the Stephanian B–Upper Rotliegend period. [less ▲]

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