Percorrer por autor "Bonjour-Dalmon, Anne"
A mostrar 1 - 2 de 2
Resultados por página
Opções de ordenação
- Epidemiology of the microsporidium nosema ceranae in four mediterranean countriesPublication . Jabal-Uriel, Clara; Barrios, Laura; Bonjour-Dalmon, Anne; Caspi-Yona, Shiran; Chejanovsky, Nor; Erez, Tal; Henriques, Dora; Higes, Mariano; Le Conte, Yves; Lopes, Ana; Meana, Aranzazu; Alice Pinto, M.; Teixeira, Amílcar; Reyes-Carreño, Maritza; Soroker, Victoria; Martín-Hernández, RaquelNosema ceranae is a highly prevalent intracellular parasite of honey bees’ midgut worldwide. This Microsporidium was monitored during a long-term study to evaluate the infection at apiary and intra-colony levels in six apiaries in four Mediterranean countries (France, Israel, Portugal, and Spain). Parameters on colony strength, honey production, beekeeping management, and climate were also recorded. Except for São Miguel (Azores, Portugal), all apiaries were positive for N. ceranae, with the lowest prevalence in mainland France and the highest intra-colony infection in Israel. A negative correlation between intra-colony infection and colony strength was observed in Spain and mainland Portugal. In these two apiaries, the queen replacement also influenced the infection levels. The highest colony losses occurred in mainland France and Spain, although they did not correlate with the Nosema infection levels, as parasitism was low in France and high in Spain. These results suggest that both the effects and the level of N. ceranae infection depends on location and beekeeping conditions. Further studies on host-parasite coevolution, and perhaps the interactions with other pathogens and the role of honey bee genetics, could assist in understanding the difference between nosemosis disease and infection, to develop appropriate strategies for its control.
- Interactions between prevalent pathogens of honeybees (Apis mellifera)Publication . Jabal-Uriel, Clara; Bonjour-Dalmon, Anne; Chejanovsky, Nor; Higes, Mariano; Le Conte, Yves; Lopes, Ana Rita; Pinto, M. Alice; Reyes-Carreño, Maritza; Soroker, Victoria; Martín-Hernández, RaquelThe aim of the BEEHEAL project was to determine the phenology and interactions of the microsporidia Nosema ceranae and 5 highly prevalent and pathogenic honeybee viruses (DWV, BQCV, ABPV, IAPV and CBPV) in four Mediterranean countries: France, Israel, Portugal and Spain. The prevalence and phenology of these pathogens was monitored in four continental apiaries (one in each country) and three insular apiaries located on Ouessant Island (France) and on São Miguel and Santa Maria Islands (Portugal). Colonies were sampled during a 2-year study period, and honeybees were collected and analysed once every two months. Microsporidia detection was performed by conventional triplexPCR whereas viral loads were determined by RT-qPCR of the positive samples. Israel had the highest percentage of honeybees infected by Ǥ ” , followed by Spain, continental Portugal, and Ouessant, whereas the levels were the lowest in France mainland and it was not detected on the Portuguese Islands. The countries with the higher prevalence of viruses were France and Israel whereas the apiaries in Portugal and Spain had a lower percentage of colonies and individual honeybees infected by viruses. Moreover, CBPV was not detected in the latter countries. The viral load of colonies and honeybees coinfected with twoor more viruseswas positively correlated. Data analysedfrom all apiariestogether showed a negative correlation between the percentage of infected N. ceranae honeybees and the viral load. However, there was no correlation at the apiary level between N. ceranae and the viral load when analysed separately. Cross-tabulations showed a correlation in coinfection between N. ceranae with any of the three viruses: BQCV, IAPV and CBPV. In fact, honeybees coinfected by the microsporidia and one of these viruses had a higher viral load than honeybees infected only with the virus. This study showed that pathogen interactions differs greatly among countries and serves as a starting point for the development of epidemiological studies to unravel pathogen coinfections.