Les faibles connaissances sur le comportement du Desman des Pyrénées Galemys pyrenaicus (É. Geoff... more Les faibles connaissances sur le comportement du Desman des Pyrénées Galemys pyrenaicus (É. Geoffroy Saint Hilaire, 1811) en réponse aux variations hydrauliques nous ont amenés à mettre en œuvre trois opérations de radiopistage sur deux tronçons court-circuités de cours d’eau ariégeois. Les opérations ont eu lieu en octobre 2014 et mai 2015 sur l’Aston, puis en septembre 2018 sur le Vicdessos, dans des contextes d’hydrologie variable, avec de fortes variations de débit liées à l’exploitation des ouvrages ou à des travaux de réfection. Six Desmans ont été suivis, dont un au cours des deux opérations sur l’Aston. Les données recueillies montrent que l’espèce présente une activité nocturne et diurne, avec cependant des déplacements plus importants la nuit. Elles ont également mis en exergue le caractère social des individus. En effet, certains partagent tout ou partie de leurs domaines vitaux et certains de leurs gîtes, auxquels ils sont d’ailleurs très fidèles. Nous avons pu observer ...
Host’s fitness can be affected by its genotype and gut microbiota, defined as the microbes living... more Host’s fitness can be affected by its genotype and gut microbiota, defined as the microbes living in the host’s intestinal tract. This study explored how the genetic diversity of the host influences its bacterial communities in the context of captive breeding programs, for the critically endangered European mink (Mustela lutreola). As stated by the ecosystem on a leash model, loss of host genetic diversity may lead to changes in immunomodulation and will therefore induce modifications of the gut microbiota. We investigated variation in the gut bacteria through 16S rRNA metabarcoding, related to the genetic diversity of European mink held in captivity in two breeding centers representing separate breeding stocks originating from the western and eastern populations. The genetic diversity of the host was assessed through diversity analysis of the adaptive MHC class I and II genes as well as neutral microsatellite markers. Results indicate lower diversity in neutral and MHC class I gene...
Wild red howler monkeys (Alouatta seniculus) were translocated during the flooding of the forest ... more Wild red howler monkeys (Alouatta seniculus) were translocated during the flooding of the forest at a hydroelectric dam site in French Guiana. For a variety of minor clinical procedures, 96 monkeys were anesthetized with various intramuscular injections of combinations of medetomidine and ketamine. The howler population was composed of healthy animals (42 males and 54 females) of various ages. Medetomidine (150 micrograms/kg) associated with ketamine (4 mg/kg) gave the best results and was used on 63 animals. The injection rapidly resulted in complete immobilization with good to excellent myorelaxation. The induction stage was quiet, with absence of both corneal and pedal withdrawal reflexes in 57 animals after 2.9 +/- 1.4 min. Six animals required an additional injection. Rectal temperature and respiratory and heart rates decreased during anesthesia, whereas relative oxyhemoglobin saturation increased. One death occurred during anesthesia. One abortion and one death also occurred the day following anesthesia but were more probably a result of capture stress. Atipamezole given i.m. at a dose of five times the medetomidine dose 38.4 +/- 8.0 min after the anesthetic injection led to standing recovery in 7.1 +/- 4.5 min. Spontaneous recovery occurred in 17 animals before the atipamezole injection after an average of 30.6 +/- 9.6 min. Total recovery time was shorter in young animals. Medetomidine/ketamine induced good myorelaxation and provided considerably shortened immobilization duration, which are two notable advantages for field studies. We recommend this association for short procedures including minor surgery in red howler monkeys.
The present study investigated the natural recovery of the Eurasian otter (Lutra lutra) in France... more The present study investigated the natural recovery of the Eurasian otter (Lutra lutra) in France. The otter was widely distributed in France at the dawn of the 20th century, but then its range considerably shrank and became highly fragmented until the early 1970s, just before it was legally protected. However, for more than 25 years, the otter has been reconquering several parts of its original range and is now considered to be in expansion in France. We investigated the genetic differentiation and diversity of several populations from western and central France and northern Spain to gain insight into the recolonisation dynamics of this elusive species. The present study, based on the use of 14 microsatellite markers, revealed that otter populations seem to be split into five distinct groups. The distribution of samples in those five clusters was closely correlated with suspected refugia where the otter probably survived during the 20th century. Admixture was observed between genetic lineages, possibly enhancing their genetic diversity and thus increasing the recolonisation dynamics of these populations. This phenomenon resembles the genetic pattern noted in many invasive exotic species derived from multiple sources and introduction events. Finally, a demographic approach revealed the probable link between historical human pressure and otter population fragmentation patterns.
Trabajo presentado al: XI Congreso de la Sociedad Espanola para la Conservacion y Estudio de los ... more Trabajo presentado al: XI Congreso de la Sociedad Espanola para la Conservacion y Estudio de los Mamiferos (SECEM) (Aviles, Asturias, 5-8 diciembre, 2013).
En el presente estudio se describe por primera vez la organizacio´n ultraestructural del espermat... more En el presente estudio se describe por primera vez la organizacio´n ultraestructural del espermatozoide de Euryhelmis squamula mediante microscopi´a electro´nica de transmisio´n. Los ejemplares adultos de E. squamula se han aislado a nivel intestinal en un viso´n americano (Mustela vison) capturado en Francia. El espermatozoide de E. squamula es filiforme y aguzado en sus dos extremidades. Se caracteriza por la presencia de dos axonemas de distinta longitud que esta´n desplazados uno respecto al otro. Estos axonemas se corresponden al tipo 9+�1� caracteri´stico de los Trepaxonemata. El espermatozoide, adema´s se caracteriza por presentar dos haces de microtu´bulos corticales paralelos, tres mitocondrias, nu´cleo y gra´nulos de glico´geno. Se comparan estos caracteres ultraestructurales con los presentes en otros dige´nidos Opisthorchioidea estudiados hasta la fecha y se discute el intere´s de los distintos caracteres espermatolo´gicos. La ausencia de uno de los axonemas en ambos ext...
1 pagina.-- Trabajo presentado al 35eme Colloque Francophone de Mammalogie: les mammiferes dans l... more 1 pagina.-- Trabajo presentado al 35eme Colloque Francophone de Mammalogie: les mammiferes dans les ecosystemes aquatiques. (Arles, Bouches-du-Rhone, France. 19 au 21 octobre 2012)
Les faibles connaissances sur le comportement du Desman des Pyrénées Galemys pyrenaicus (É. Geoff... more Les faibles connaissances sur le comportement du Desman des Pyrénées Galemys pyrenaicus (É. Geoffroy Saint Hilaire, 1811) en réponse aux variations hydrauliques nous ont amenés à mettre en œuvre trois opérations de radiopistage sur deux tronçons court-circuités de cours d’eau ariégeois. Les opérations ont eu lieu en octobre 2014 et mai 2015 sur l’Aston, puis en septembre 2018 sur le Vicdessos, dans des contextes d’hydrologie variable, avec de fortes variations de débit liées à l’exploitation des ouvrages ou à des travaux de réfection. Six Desmans ont été suivis, dont un au cours des deux opérations sur l’Aston. Les données recueillies montrent que l’espèce présente une activité nocturne et diurne, avec cependant des déplacements plus importants la nuit. Elles ont également mis en exergue le caractère social des individus. En effet, certains partagent tout ou partie de leurs domaines vitaux et certains de leurs gîtes, auxquels ils sont d’ailleurs très fidèles. Nous avons pu observer ...
Host’s fitness can be affected by its genotype and gut microbiota, defined as the microbes living... more Host’s fitness can be affected by its genotype and gut microbiota, defined as the microbes living in the host’s intestinal tract. This study explored how the genetic diversity of the host influences its bacterial communities in the context of captive breeding programs, for the critically endangered European mink (Mustela lutreola). As stated by the ecosystem on a leash model, loss of host genetic diversity may lead to changes in immunomodulation and will therefore induce modifications of the gut microbiota. We investigated variation in the gut bacteria through 16S rRNA metabarcoding, related to the genetic diversity of European mink held in captivity in two breeding centers representing separate breeding stocks originating from the western and eastern populations. The genetic diversity of the host was assessed through diversity analysis of the adaptive MHC class I and II genes as well as neutral microsatellite markers. Results indicate lower diversity in neutral and MHC class I gene...
Wild red howler monkeys (Alouatta seniculus) were translocated during the flooding of the forest ... more Wild red howler monkeys (Alouatta seniculus) were translocated during the flooding of the forest at a hydroelectric dam site in French Guiana. For a variety of minor clinical procedures, 96 monkeys were anesthetized with various intramuscular injections of combinations of medetomidine and ketamine. The howler population was composed of healthy animals (42 males and 54 females) of various ages. Medetomidine (150 micrograms/kg) associated with ketamine (4 mg/kg) gave the best results and was used on 63 animals. The injection rapidly resulted in complete immobilization with good to excellent myorelaxation. The induction stage was quiet, with absence of both corneal and pedal withdrawal reflexes in 57 animals after 2.9 +/- 1.4 min. Six animals required an additional injection. Rectal temperature and respiratory and heart rates decreased during anesthesia, whereas relative oxyhemoglobin saturation increased. One death occurred during anesthesia. One abortion and one death also occurred the day following anesthesia but were more probably a result of capture stress. Atipamezole given i.m. at a dose of five times the medetomidine dose 38.4 +/- 8.0 min after the anesthetic injection led to standing recovery in 7.1 +/- 4.5 min. Spontaneous recovery occurred in 17 animals before the atipamezole injection after an average of 30.6 +/- 9.6 min. Total recovery time was shorter in young animals. Medetomidine/ketamine induced good myorelaxation and provided considerably shortened immobilization duration, which are two notable advantages for field studies. We recommend this association for short procedures including minor surgery in red howler monkeys.
The present study investigated the natural recovery of the Eurasian otter (Lutra lutra) in France... more The present study investigated the natural recovery of the Eurasian otter (Lutra lutra) in France. The otter was widely distributed in France at the dawn of the 20th century, but then its range considerably shrank and became highly fragmented until the early 1970s, just before it was legally protected. However, for more than 25 years, the otter has been reconquering several parts of its original range and is now considered to be in expansion in France. We investigated the genetic differentiation and diversity of several populations from western and central France and northern Spain to gain insight into the recolonisation dynamics of this elusive species. The present study, based on the use of 14 microsatellite markers, revealed that otter populations seem to be split into five distinct groups. The distribution of samples in those five clusters was closely correlated with suspected refugia where the otter probably survived during the 20th century. Admixture was observed between genetic lineages, possibly enhancing their genetic diversity and thus increasing the recolonisation dynamics of these populations. This phenomenon resembles the genetic pattern noted in many invasive exotic species derived from multiple sources and introduction events. Finally, a demographic approach revealed the probable link between historical human pressure and otter population fragmentation patterns.
Trabajo presentado al: XI Congreso de la Sociedad Espanola para la Conservacion y Estudio de los ... more Trabajo presentado al: XI Congreso de la Sociedad Espanola para la Conservacion y Estudio de los Mamiferos (SECEM) (Aviles, Asturias, 5-8 diciembre, 2013).
En el presente estudio se describe por primera vez la organizacio´n ultraestructural del espermat... more En el presente estudio se describe por primera vez la organizacio´n ultraestructural del espermatozoide de Euryhelmis squamula mediante microscopi´a electro´nica de transmisio´n. Los ejemplares adultos de E. squamula se han aislado a nivel intestinal en un viso´n americano (Mustela vison) capturado en Francia. El espermatozoide de E. squamula es filiforme y aguzado en sus dos extremidades. Se caracteriza por la presencia de dos axonemas de distinta longitud que esta´n desplazados uno respecto al otro. Estos axonemas se corresponden al tipo 9+�1� caracteri´stico de los Trepaxonemata. El espermatozoide, adema´s se caracteriza por presentar dos haces de microtu´bulos corticales paralelos, tres mitocondrias, nu´cleo y gra´nulos de glico´geno. Se comparan estos caracteres ultraestructurales con los presentes en otros dige´nidos Opisthorchioidea estudiados hasta la fecha y se discute el intere´s de los distintos caracteres espermatolo´gicos. La ausencia de uno de los axonemas en ambos ext...
1 pagina.-- Trabajo presentado al 35eme Colloque Francophone de Mammalogie: les mammiferes dans l... more 1 pagina.-- Trabajo presentado al 35eme Colloque Francophone de Mammalogie: les mammiferes dans les ecosystemes aquatiques. (Arles, Bouches-du-Rhone, France. 19 au 21 octobre 2012)
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