Marc Cheylan | Ecole Pratique des Hautes Etudes (original) (raw)

Papers by Marc Cheylan

Research paper thumbnail of New localities of Triturus cristatus Laurenti, 1768 Amphibia, Caudata in the French mediterranean area Decouverte du triton crete Triturus cristatus Laurenti, 1768 Amphibia, Caudata dans la region Mediterraneenne francaise

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Research paper thumbnail of Record size of Coronella girondica in Provence (Vaucluse, France)

HAL (Le Centre pour la Communication Scientifique Directe), 2022

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Research paper thumbnail of IUCN Red List of Threatened Species: Western Spadefoot

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Research paper thumbnail of Pelodytes punctatus

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Research paper thumbnail of Quel avenir pour la vipère d’Orsini en France ?

Ecologia mediterranea, 2004

Cheylan Marc, Lyet Arnaud, Orsini Philippe, Penloup Aura. Quel avenir pour la vipère d’Orsini en ... more Cheylan Marc, Lyet Arnaud, Orsini Philippe, Penloup Aura. Quel avenir pour la vipère d’Orsini en France ?. In: Ecologia mediterranea, tome 30 n°2, 2004. pp. 241-242

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Research paper thumbnail of Caractérisation de l’activité alimentaire annuelle du Lézard ocellé Timon lepidus à partir des fèces sur l’île d’Oléron (littoral atlantique français)

Revue d'Écologie (La Terre et La Vie)

Résumé. — L’activité alimentaire du Lézard ocellé a été étudiée durant 2 années sur l’île d’Oléro... more Résumé. — L’activité alimentaire du Lézard ocellé a été étudiée durant 2 années sur l’île d’Oléron, à partir de fèces collectées le long d’un transect. La collecte de 753 fèces en 2002 et 646 en 2006 permet de suivre avec précision l’importance des prises alimentaires au cours du cycle annuel. L’activité alimentaire débute dans la deuxième décade de mars et s’achève dans la troisième décade d’octobre, avec un pic d’activité en mai en 2002 et en juin-juillet en 2006. Elle est principalement expliquée par la durée du jour et par la température moyenne ; peu par la pluviosité (régression multiple). Le rythme d’activité alimentaire de cette population diffère peu de celui observé dans les populations du sud de la France et du centre de l’Espagne malgré la position géographique extrême de cette population. Moyennant certaines précautions, cette méthode pourrait être utilisée pour un suivi à long terme de la population.

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Research paper thumbnail of Decline of a Hermann’s Tortoise (Testudo hermanni hermanni Gmelin, 1789) population in forest. Combined effects of several anthropogenic factors

This study investigates the evolution of a population of Hermann’s tortoises, located on the edge... more This study investigates the evolution of a population of Hermann’s tortoises, located on the edge of the massif des Maures, over a period of 30 years through capture–recapture monitoring. It shows a considerable decline of 73 % in the number of adult tortoises between the early 1980s and 1999; then from 1999, the population stabilized at around 100 adult tortoises. The fall in numbers during the first period seems to be linked to several factors. The 22 % increase in forest cover between 1983 and 1995 increased the concentrations of eggs laid in some open areas, making it easier for the species’ natural predators to find them. Mechanized clearance of undergrowth carried out in 1989 and 1994 has undoubtedly reduced the size of the population. The presence of dogs has posed an additional threat (97 % of the adult tortoises have bite marks and 7 % are missing limbs). In addition, the impact of dog bites on the tortoises’ shells has, over time, removed individual markings, thereby disto...

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Research paper thumbnail of Citizen-science data shows long-term decline of snakes in southwestern Europe

Biodiversity and Conservation

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Research paper thumbnail of Amphibian response to the non-native fish, Lepomis gibbosus: the case of the Pinail Nature Reserve, France

Herpetological Conservation and Biology, 2017

Amphibians are a highly endangered taxonomic group, and invasion of alien species in wetland syst... more Amphibians are a highly endangered taxonomic group, and invasion of alien species in wetland systems has been involved in this decline. The Pinail Nature Reserve, Vienne, France, contains more than 5,000 ponds, many of which are occupied by introduced Pumpkinseed Sunfish (Lepomis gibbosus). We sampled ponds with and without sunfish for amphibian species presence multiple times over 2 y. The number of amphibian species was significantly greater in ponds without sunfish (3.3 ± 0.2 [SD] species in 2004; 3.5 ± 0.2 in 2005) than in ponds with sunfish (1.6 ± 0.4 in 2004; 0.9 ± 0.2 in 2005). Sunfish presence was negatively related to the frequency of occurrence in ponds for Triturus marmoratus (Marbled Newt), Hyla arborea (European Tree Frog), Lissotriton helveticus (Palmate Newt), and Pelophylax spp. (Green Frog complex). The effect was especially pronounced for Hyla arborea and Triturus marmoratus, with occupancy nearly 50% and 100%, respectively, in ponds without sunfish, but 0% and 20%, respectively, in ponds with sunfish. Our study did not reveal a significant effect of sunfish presence on three other infrequently encountered amphibian species: Bufo spinosus (Spiny Toad), Rana dalmatina (Agile Frog), and Triturus cristatus (Great Crested Newt). Stomach content analyses confirmed predation on larval amphibians by sunfish. This study showed that Pumpkinseek Sunfish can negatively affect amphibians with species-specific impacts.

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Research paper thumbnail of Qualité des habitats, mouvements saisonniers et condition corporelle chez la tortue d'Hermann Testudo hermanni

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Research paper thumbnail of Critères de détermination des mues de serpents en France

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Research paper thumbnail of FIGURE 8 in Additional data on the herpetological collection of Louis Amédée Lantz (1886 - 1953), with emphasis on specimens in the Natural History Museum, London

FIGURE 8. Location of the French Mediterranean islands and islets visited by Lantz during his her... more FIGURE 8. Location of the French Mediterranean islands and islets visited by Lantz during his herpetological prospecting.

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Research paper thumbnail of FIGURE 1. Iranolacerta brandtii, BMNH 1973.3492 in Additional data on the herpetological collection of Louis Amédée Lantz (1886 - 1953), with emphasis on specimens in the Natural History Museum, London

FIGURE 1. Iranolacerta brandtii, BMNH 1973.3492. Scale: one square side = 1 cm.

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Research paper thumbnail of FIGURE 3 in Additional data on the herpetological collection of Louis Amédée Lantz (1886 - 1953), with emphasis on specimens in the Natural History Museum, London

FIGURE 3. Rascas Islet was visited by L.A. Lantz in April 1931. That islet is located 170 meters ... more FIGURE 3. Rascas Islet was visited by L.A. Lantz in April 1931. That islet is located 170 meters from Port-Cros Island in the Hyères Islands Archipelago (also sometimes called the Porquerolles Islands). It is one of the smallest Mediterranean islets (0.45 ha) and is host to two species of lizard; the European Leaf-toed Gecko (Euleptes europaea) and the Wall Lizard (Podarcis muralis (Laurenti)). Lantz collected five Wall lizards and one European Leaf-toed Gecko but they were never published (Lantz 1931).

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Research paper thumbnail of Observations et remarques sur l’herpétofaune des îlots de Provence (de Six-Fours à la Londe)

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Research paper thumbnail of Nouvelle liste taxinomique de l’herpétofaune de la France métropolitaine

International audienc

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Research paper thumbnail of La recherche archéozoologique en Albanie : un état de la question à Sovjan (bassin de Korçë)

Bulletin De Correspondance Hellenique, 2002

La faune du site de Sovjan, situe a 818 m d'altitude en bordure de l'ancien lac Maliq dan... more La faune du site de Sovjan, situe a 818 m d'altitude en bordure de l'ancien lac Maliq dans le bassin de Korce (Sud-Est de l'Albanie) fait l'objet d'un projet d'analyses fauniques mis en place en 1999, ressemblant a la fois des archeozoologues et des zoologistes, tous egalement interesses par le potentiel d'informations biologiques, ecologiques mais aussi archeologiques et environnementales offert par ce gisement dont la chronologie couvre les âges du Bronze et du fer. Ces collaborations s'integrent a un programme de recherche recent sur le bassin de Korce et sont generees par l'interet du site couple a la relative absence de donnees equivalentes pour ces periodes dans la region consideree. En effet, les seules references archeozoologiques ou paleontologiques que nous ayons trouvees pour l'Albanie concernent le site Pleistocene Moyen de Gajtan, pres de Shkoder, dans le Nord du pays, et la grotte de Konispol dans le Sud-Ouest pour la periode de ...

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Research paper thumbnail of Statut des populations franco-italiennes de Lézard ocellé Timon lepidu lepidus (Daudin, 1801)

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Research paper thumbnail of Envenomations by Orsini's Viper Vipera ursinii (Bonaparte, 1835)

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Research paper thumbnail of The extinction of the ocellated lizard Timon lepidus lepidus (Daudin, 1802) on the island of Porquerolles (Provence, France)

Se documenta el proceso de extincion del lagarto ocelado Timon lepidus en la isla de Porquerolles... more Se documenta el proceso de extincion del lagarto ocelado Timon lepidus en la isla de Porquerolles (Provenza, Francia). Las prospecciones realizadas en 2001 y 2002 con el objetivo de volver a encontrar la especie fueron negativas. A partir de esto se infiere que la especie se extinguio en la decada de 2000. Las causas de la desaparicion de la especie son controvertidas y parecen deberse a una evolucion desfavorable de los habitats y a la depredacion que ejerce el faisan vulgar, introducido en los anos 1970.

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Research paper thumbnail of New localities of Triturus cristatus Laurenti, 1768 Amphibia, Caudata in the French mediterranean area Decouverte du triton crete Triturus cristatus Laurenti, 1768 Amphibia, Caudata dans la region Mediterraneenne francaise

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Research paper thumbnail of Record size of Coronella girondica in Provence (Vaucluse, France)

HAL (Le Centre pour la Communication Scientifique Directe), 2022

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Research paper thumbnail of IUCN Red List of Threatened Species: Western Spadefoot

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Research paper thumbnail of Pelodytes punctatus

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Research paper thumbnail of Quel avenir pour la vipère d’Orsini en France ?

Ecologia mediterranea, 2004

Cheylan Marc, Lyet Arnaud, Orsini Philippe, Penloup Aura. Quel avenir pour la vipère d’Orsini en ... more Cheylan Marc, Lyet Arnaud, Orsini Philippe, Penloup Aura. Quel avenir pour la vipère d’Orsini en France ?. In: Ecologia mediterranea, tome 30 n°2, 2004. pp. 241-242

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Research paper thumbnail of Caractérisation de l’activité alimentaire annuelle du Lézard ocellé Timon lepidus à partir des fèces sur l’île d’Oléron (littoral atlantique français)

Revue d'Écologie (La Terre et La Vie)

Résumé. — L’activité alimentaire du Lézard ocellé a été étudiée durant 2 années sur l’île d’Oléro... more Résumé. — L’activité alimentaire du Lézard ocellé a été étudiée durant 2 années sur l’île d’Oléron, à partir de fèces collectées le long d’un transect. La collecte de 753 fèces en 2002 et 646 en 2006 permet de suivre avec précision l’importance des prises alimentaires au cours du cycle annuel. L’activité alimentaire débute dans la deuxième décade de mars et s’achève dans la troisième décade d’octobre, avec un pic d’activité en mai en 2002 et en juin-juillet en 2006. Elle est principalement expliquée par la durée du jour et par la température moyenne ; peu par la pluviosité (régression multiple). Le rythme d’activité alimentaire de cette population diffère peu de celui observé dans les populations du sud de la France et du centre de l’Espagne malgré la position géographique extrême de cette population. Moyennant certaines précautions, cette méthode pourrait être utilisée pour un suivi à long terme de la population.

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Research paper thumbnail of Decline of a Hermann’s Tortoise (Testudo hermanni hermanni Gmelin, 1789) population in forest. Combined effects of several anthropogenic factors

This study investigates the evolution of a population of Hermann’s tortoises, located on the edge... more This study investigates the evolution of a population of Hermann’s tortoises, located on the edge of the massif des Maures, over a period of 30 years through capture–recapture monitoring. It shows a considerable decline of 73 % in the number of adult tortoises between the early 1980s and 1999; then from 1999, the population stabilized at around 100 adult tortoises. The fall in numbers during the first period seems to be linked to several factors. The 22 % increase in forest cover between 1983 and 1995 increased the concentrations of eggs laid in some open areas, making it easier for the species’ natural predators to find them. Mechanized clearance of undergrowth carried out in 1989 and 1994 has undoubtedly reduced the size of the population. The presence of dogs has posed an additional threat (97 % of the adult tortoises have bite marks and 7 % are missing limbs). In addition, the impact of dog bites on the tortoises’ shells has, over time, removed individual markings, thereby disto...

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Research paper thumbnail of Citizen-science data shows long-term decline of snakes in southwestern Europe

Biodiversity and Conservation

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Research paper thumbnail of Amphibian response to the non-native fish, Lepomis gibbosus: the case of the Pinail Nature Reserve, France

Herpetological Conservation and Biology, 2017

Amphibians are a highly endangered taxonomic group, and invasion of alien species in wetland syst... more Amphibians are a highly endangered taxonomic group, and invasion of alien species in wetland systems has been involved in this decline. The Pinail Nature Reserve, Vienne, France, contains more than 5,000 ponds, many of which are occupied by introduced Pumpkinseed Sunfish (Lepomis gibbosus). We sampled ponds with and without sunfish for amphibian species presence multiple times over 2 y. The number of amphibian species was significantly greater in ponds without sunfish (3.3 ± 0.2 [SD] species in 2004; 3.5 ± 0.2 in 2005) than in ponds with sunfish (1.6 ± 0.4 in 2004; 0.9 ± 0.2 in 2005). Sunfish presence was negatively related to the frequency of occurrence in ponds for Triturus marmoratus (Marbled Newt), Hyla arborea (European Tree Frog), Lissotriton helveticus (Palmate Newt), and Pelophylax spp. (Green Frog complex). The effect was especially pronounced for Hyla arborea and Triturus marmoratus, with occupancy nearly 50% and 100%, respectively, in ponds without sunfish, but 0% and 20%, respectively, in ponds with sunfish. Our study did not reveal a significant effect of sunfish presence on three other infrequently encountered amphibian species: Bufo spinosus (Spiny Toad), Rana dalmatina (Agile Frog), and Triturus cristatus (Great Crested Newt). Stomach content analyses confirmed predation on larval amphibians by sunfish. This study showed that Pumpkinseek Sunfish can negatively affect amphibians with species-specific impacts.

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Research paper thumbnail of Qualité des habitats, mouvements saisonniers et condition corporelle chez la tortue d'Hermann Testudo hermanni

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Research paper thumbnail of Critères de détermination des mues de serpents en France

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Research paper thumbnail of FIGURE 8 in Additional data on the herpetological collection of Louis Amédée Lantz (1886 - 1953), with emphasis on specimens in the Natural History Museum, London

FIGURE 8. Location of the French Mediterranean islands and islets visited by Lantz during his her... more FIGURE 8. Location of the French Mediterranean islands and islets visited by Lantz during his herpetological prospecting.

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Research paper thumbnail of FIGURE 1. Iranolacerta brandtii, BMNH 1973.3492 in Additional data on the herpetological collection of Louis Amédée Lantz (1886 - 1953), with emphasis on specimens in the Natural History Museum, London

FIGURE 1. Iranolacerta brandtii, BMNH 1973.3492. Scale: one square side = 1 cm.

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Research paper thumbnail of FIGURE 3 in Additional data on the herpetological collection of Louis Amédée Lantz (1886 - 1953), with emphasis on specimens in the Natural History Museum, London

FIGURE 3. Rascas Islet was visited by L.A. Lantz in April 1931. That islet is located 170 meters ... more FIGURE 3. Rascas Islet was visited by L.A. Lantz in April 1931. That islet is located 170 meters from Port-Cros Island in the Hyères Islands Archipelago (also sometimes called the Porquerolles Islands). It is one of the smallest Mediterranean islets (0.45 ha) and is host to two species of lizard; the European Leaf-toed Gecko (Euleptes europaea) and the Wall Lizard (Podarcis muralis (Laurenti)). Lantz collected five Wall lizards and one European Leaf-toed Gecko but they were never published (Lantz 1931).

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Research paper thumbnail of Observations et remarques sur l’herpétofaune des îlots de Provence (de Six-Fours à la Londe)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nouvelle liste taxinomique de l’herpétofaune de la France métropolitaine

International audienc

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Research paper thumbnail of La recherche archéozoologique en Albanie : un état de la question à Sovjan (bassin de Korçë)

Bulletin De Correspondance Hellenique, 2002

La faune du site de Sovjan, situe a 818 m d'altitude en bordure de l'ancien lac Maliq dan... more La faune du site de Sovjan, situe a 818 m d'altitude en bordure de l'ancien lac Maliq dans le bassin de Korce (Sud-Est de l'Albanie) fait l'objet d'un projet d'analyses fauniques mis en place en 1999, ressemblant a la fois des archeozoologues et des zoologistes, tous egalement interesses par le potentiel d'informations biologiques, ecologiques mais aussi archeologiques et environnementales offert par ce gisement dont la chronologie couvre les âges du Bronze et du fer. Ces collaborations s'integrent a un programme de recherche recent sur le bassin de Korce et sont generees par l'interet du site couple a la relative absence de donnees equivalentes pour ces periodes dans la region consideree. En effet, les seules references archeozoologiques ou paleontologiques que nous ayons trouvees pour l'Albanie concernent le site Pleistocene Moyen de Gajtan, pres de Shkoder, dans le Nord du pays, et la grotte de Konispol dans le Sud-Ouest pour la periode de ...

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Research paper thumbnail of Statut des populations franco-italiennes de Lézard ocellé Timon lepidu lepidus (Daudin, 1801)

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Research paper thumbnail of Envenomations by Orsini's Viper Vipera ursinii (Bonaparte, 1835)

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Research paper thumbnail of The extinction of the ocellated lizard Timon lepidus lepidus (Daudin, 1802) on the island of Porquerolles (Provence, France)

Se documenta el proceso de extincion del lagarto ocelado Timon lepidus en la isla de Porquerolles... more Se documenta el proceso de extincion del lagarto ocelado Timon lepidus en la isla de Porquerolles (Provenza, Francia). Las prospecciones realizadas en 2001 y 2002 con el objetivo de volver a encontrar la especie fueron negativas. A partir de esto se infiere que la especie se extinguio en la decada de 2000. Las causas de la desaparicion de la especie son controvertidas y parecen deberse a una evolucion desfavorable de los habitats y a la depredacion que ejerce el faisan vulgar, introducido en los anos 1970.

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Research paper thumbnail of Ecological solidarity as a conceptual tool for rethinking ecological and social interdependence in conservation policy for protected areas and their surrounding landscape

Comptes Rendus Biologies, 2011

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