Présence de Grillons du genre Myrmecophilus à l'île de la Réunion (Orthoptera, Myrmecophilinae)

First sighting of Myrmecophilus crickets on Réunion island (Orthoptera, Myrmecophilinae). Two ant-loving crickets are observed for the first time on Réunion island (Indian Ocean), Myrmecophilus quadrispinus Perkins, 1 899, and M. americanus Saussure, 1 877. This is the first observation of the former outside the Pacific area. Distinctive characters between M. americanus and M. cottami Chopard, 1922, are discussed as well as the synonyms of Myrmecophilus microscopicus Gorochov, 1994. The synonymy between M. microscopicus and M. albicintus Chopard, 1924, is removed.Deux espèces de Grillons myrmécophiles sont mentionnées de la Réunion : Myrmecophilus quadrispinus Perkins, 1899, et M. americanus Saussure, 1877. Il s'agit de la première observation du premier hors de la région Pacifique. Les caractères distinctifs de M. americanus et M. cottami Chopard, 1922, sont discutés ainsi que les synonymes de Myrmecophilus microscopicus Gorochov, 1994. La synonymie entre M. microscopicas et M. albicinctus Chopard, 1924, est annulée.Hugel Sylvain, Blard Fabrice. Présence de Grillons du genre Myrmecophilus à l'île de la Réunion (Orthoptera, Myrmecophilinae). In: Bulletin de la Société entomologique de France, volume 110 (4-5), octobre/décembre 2005. pp. 387-389

Les fourmis envahissantes de l'ile de La Réunion (interactions compétitives et facteurs d'invasion)

Sur les six espèces de fourmis envahissantes reconnues dans le monde comme les plus dangereuses, trois sont présentes à La Réunion : Anoplolepis gracilipes, Pheidole megacephala et Solenopsis geminata. Notre étude a porté sur les relations compétitives entre ces trois espèces, ainsi que sur les facteurs liés à leur succès dans l'invasion des milieux. Elles coexistent dans les milieux anthropiques de basse altitude : P. megacephala et S. geminata représentent les deux espèces dominantes, leurs densités variant en fonction des conditions climatiques, tandis qu'A gracilipes est plus rare. Ces trois espèces n'ont en revanche jamais été observées dans les forêts échantillonnées : l'importance des conditions environnementales dans la dominance de ces fourmis invasives pourrait expliquer ce résultat, Néanmoins la pauvreté de la myrmécofaune dans ces milieux offre toutes les conditions à rétablissement d'autres espèces envahissantes.Among the six most widespread and damaging invasive ants. three are present in Reunion Island: Anoplolepis gracilipes, Pheidole megacephala and A. gracilipes. This study focused on the competitive interactions among these three species and on the factors linked to their invasive success. These ants coexist in lowland anthropogenic habitats: P. megacephala and S. geminata were the two dominant species, the densities of their colonies varying with the climatic conditions, whereas A. gracilipes was rare. They have never been observed in the sampled forests: the importance of the environmental conditions on the dominance of these invasive ants could explain this result. However the low ant species diversity in these habitats provides a niche opportunity for some other invasive ants.SAINT DENIS/REUNION-Droit Lettre (974112101) / SudocSudocFranceReunionFRR

Présence de Grillons du genre Myrmecophilus à l'île de la Réunion (Orthoptera, Myrmecophilinae)

First sighting of Myrmecophilus crickets on Réunion island (Orthoptera, Myrmecophilinae). Two ant-loving crickets are observed for the first time on Réunion island (Indian Ocean), Myrmecophilus quadrispinus Perkins, 1 899, and M. americanus Saussure, 1 877. This is the first observation of the former outside the Pacific area. Distinctive characters between M. americanus and M. cottami Chopard, 1922, are discussed as well as the synonyms of Myrmecophilus microscopicus Gorochov, 1994. The synonymy between M. microscopicus and M. albicintus Chopard, 1924, is removed.Deux espèces de Grillons myrmécophiles sont mentionnées de la Réunion : Myrmecophilus quadrispinus Perkins, 1899, et M. americanus Saussure, 1877. Il s'agit de la première observation du premier hors de la région Pacifique. Les caractères distinctifs de M. americanus et M. cottami Chopard, 1922, sont discutés ainsi que les synonymes de Myrmecophilus microscopicus Gorochov, 1994. La synonymie entre M. microscopicas et M. albicinctus Chopard, 1924, est annulée.Hugel Sylvain, Blard Fabrice. Présence de Grillons du genre Myrmecophilus à l'île de la Réunion (Orthoptera, Myrmecophilinae). In: Bulletin de la Société entomologique de France, volume 110 (4-5), octobre/décembre 2005. pp. 387-389

Le suprefact à faible dose : une alternative prometteuse pour induire l'ovulation chez la jument

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Les Fourmis de l'île de la Réunion (Hymenoptera, Formicidae)

Ants of Réunion Island (Hymenoptera, Formicidae). In this study, 27 ant species are reported with 15 new for the island. Half of the ant fauna is composed of "tramp species" and only two endemic species of the Mascarene Islands have been found. Distribution, ecology and biogeography are discussed.Cette étude sur la myrmécofaune de l'île de la Réunion a permis d'inventorier 27 espèces dont 15 nouvelles pour l'île. Si l'on ne compte que deux espèces endémiques des Mascareignes, plus de la moitié des espèces présentes sont des fourmis "vagabondes". Leur distribution, écologie et origine biogéographique sont discutées.Blard Fabrice, Dorow Wolfgang-H.-O., Delabie Jacques H.C. Les Fourmis de l'île de la Réunion (Hymenoptera, Formicidae). In: Bulletin de la Société entomologique de France, volume 108 (2), juin 2003. pp. 127-137

Les Fourmis de l'île de la Réunion (Hymenoptera, Formicidae)

Ants of Réunion Island (Hymenoptera, Formicidae). In this study, 27 ant species are reported with 15 new for the island. Half of the ant fauna is composed of "tramp species" and only two endemic species of the Mascarene Islands have been found. Distribution, ecology and biogeography are discussed.Cette étude sur la myrmécofaune de l'île de la Réunion a permis d'inventorier 27 espèces dont 15 nouvelles pour l'île. Si l'on ne compte que deux espèces endémiques des Mascareignes, plus de la moitié des espèces présentes sont des fourmis "vagabondes". Leur distribution, écologie et origine biogéographique sont discutées.Blard Fabrice, Dorow Wolfgang-H.-O., Delabie Jacques H.C. Les Fourmis de l'île de la Réunion (Hymenoptera, Formicidae). In: Bulletin de la Société entomologique de France, volume 108 (2), juin 2003. pp. 127-137

First attempts for vitrification of immature oocytes in donkey (Equus asinus): Comparison of two vitrification methods

Most wild donkey breeds are severely threatened by poaching for meat, habitat loss, and competition with livestock for food resources. Moreover, due to the mechanization in agriculture and in transport, most domestic donkey breeds are at risk of extinction. Considering the importance of biodiversity and preservation of genetic resources, the creation of genetic banks for endangered donkey breeds is urgently needed. Cryopreservation of immature jennies oocytes would be an efficient tool to allow storage of female genetics. The aim of the present study was to establish conditions for immature donkey oocyte vitrification, using equine oocytes as a control. Asine and equine immature cumulus-oocyte complexes were collected by transvaginal ultrasound-guided follicular aspiration and flushed to obtain oocytes surrounded by only corona radiata. Oocytes were vitrified after exposure to increasing concentrations of dimethyl sulfoxide, ethylene glycol and sucrose as cryoprotectants in a solution of INRA-Freeze™ medium or TCM199-Hepes supplemented with bovine serum albumin. Oocytes were warmed in decreasing concentrations of sucrose and processed for in vitro maturation. The recovery rate was 48% for jennies oocytes (4.8 oocyte per female) and 42% for mares oocytes (3.5 oocyte per female). When oocytes were exposed to cryoprotectants in INRA-Freeze™ medium none of the jennies re-warmed oocytes matured, whereas 24% of the mares re-warmed oocytes reached metaphase II after in vitro maturation. When oocytes were exposed to cryoprotectants in TCM199-Hepes-BSA medium, 33% of the jennies re-warmed oocytes matured. In conclusion, we developed a method for the vitrification of immature oocytes from jennies that allows in vitro maturation of the vitrified-warmed asine oocytes. Their competence for fertilization and development has to be ascertain. © 2018 Elsevier Inc

Zinc-glycinate improves the bioavailability of zinc in ponies.

International audienceZinc (Zn) is an essential nutrient with many functions for immunity, growth, reproduction and the quality of skin, hoof and hair. The objective of this trial was to compare absorption efficiency of Zn between sources. Twenty Welsh ponies, aged 2–7, were housed in 2 pens (open stable). All had ad libitum access to straw (3.8 mg Zn/kg dry matter (DM)), water, a licking block (only NaCl) and 3 kg hay/pony/day (2.4 kg DM, 35.8 mg Zn/kg DM). The animals were depleted for 2 months prior to the trial. Zn was supplemented with a single oral dose of 10 mg/kg BW in the morning, either from zinc oxide (INOR), or a zinc-glycinate (B-TRAXIM®2C Zn, Pancosma SA) (BTZN). Blood samples were taken 30 minutes before and 1, 2, 3, 4, 5, 7, 9, 13 and 24 hours after the single dose. Ten ponies (5 per pen) were randomly selected as negative control (NC) and sampled for blood following the same schedule, 4 days before Zn supplementation. Blood samples were analyzed for Zn level in the plasma (colorimetric analysis) and the results statistically analyzed (t-test). BTZN ponies showed a significant higher surface under the absorption curve compared to NC (33.9 vs. 1.69, P < 0.0001) and INOR (33.9 vs. 11.39, P < 0.0001). A significant higher maximum Zn-level in the plasma of BTZN ponies was observed compared to NC (20.41 vs. 10.53, P < 0.0001) and INOR (20.41 vs. 14.54, P < 0.0017). Both parameters indicate a higher and faster absorption of Zn from BTZN, compared to INOR. BTZN is significantly more absorbed over 24 hours after a single oral dose, providing important information to optimize Zn supplementation for horses. Zn availability over time and in different conditions must be studied in horses to complement this information and improve recommendations in practice