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Impact of honey bee migratory management on pathogen loads and immune gene expression is affected by complex interactions with environment, worker life history, and season Texte intégral
2022
Simone-Finstrom, Michael | Strand, Micheline K. | Tarpy, David R. | Rueppell, Olav
The effects of management, such as intensive migratory beekeeping, are of ongoing debate concerning the causes of honey bee health problems. Even though comparisons of disease among differently managed colonies indicate some effects, the direct impact of migratory practices on honey bee diseases are not well understood. To test the long- and short-term impact of managed migration on disease loads and immunity, experimental honey bee colonies were maintained with or without migratory movement and individuals that experienced migration as juveniles (e.g., larval and pupal development), as adults, or both were compared to control colonies that remained stationary and therefore did not experience migratory relocation. Samples at different ages and life history stages (hive bees or foragers), taken at the beginning and end of the active season, were analyzed for pathogen loads and physiological markers associated with health or stress. Bees exposed to migratory management during adulthood had increased levels of the AKI virus complex (Acute bee paralysis, Kashmir bee, and Israeli acute bee paralysis viruses) and decreased levels of antiviral gene expression (dicer-like, hsp90). However, those in stationary management as adults had elevated gut parasites (Nosema and trypanosomes). Effects of environment during juvenile development were more complex and interacted with life-history stage and season. Age at collection, life-history stage, and season all influenced numerous factors from viral load to immune gene expression. Overall, these data shed light on the complexity of how management practices can influence individual bee exposure to pathogens, health, and resiliency.
Afficher plus [+] Moins [-]The Epidemiological Situation of the Managed Honey Bee (Apis mellifera) Colonies in the Italian Region Emilia-Romagna Texte intégral
2022
Cilia, Giovanni | Tafi, Elena | Zavatta, Laura | Caringi, Valeria | Nanetti, Antonio
The Epidemiological Situation of the Managed Honey Bee (Apis mellifera) Colonies in the Italian Region Emilia-Romagna Texte intégral
2022
Cilia, Giovanni | Tafi, Elena | Zavatta, Laura | Caringi, Valeria | Nanetti, Antonio
The recent decades witnessed the collapse of honey bee colonies at a global level. The major drivers of this collapse include both individual and synergic pathogen actions, threatening the colonies’ survival. The need to define the epidemiological pattern of the pathogens that are involved has led to the establishment of monitoring programs in many countries, Italy included. In this framework, the health status of managed honey bees in the Emilia–Romagna region (northern Italy) was assessed, throughout the year 2021, on workers from 31 apiaries to investigate the presence of major known and emerging honey bee pathogens. The prevalence and abundance of DWV, KBV, ABPV, CBPV, Nosema ceranae, and trypanosomatids (Lotmaria passim, Crithidia mellificae, Crithidia bombi) were assessed by molecular methods. The most prevalent pathogen was DWV, followed by CBPV and N. ceranae. Trypanosomatids were not found in any of the samples. Pathogens had different peaks in abundance over the months, showing seasonal trends that were related to the dynamics of both bee colonies and Varroa destructor infestation. For some of the pathogens, a weak but significant correlation was observed between abundance and geographical longitude. The information obtained in this study increases our understanding of the epidemiological situation of bee colonies in Emilia–Romagna and helps us to implement better disease prevention and improved territorial management of honey bee health.
Afficher plus [+] Moins [-]The Epidemiological Situation of the Managed Honey Bee (<i>Apis mellifera</i>) Colonies in the Italian Region Emilia-Romagna Texte intégral
2022
Giovanni Cilia | Elena Tafi | Laura Zavatta | Valeria Caringi | Antonio Nanetti
The recent decades witnessed the collapse of honey bee colonies at a global level. The major drivers of this collapse include both individual and synergic pathogen actions, threatening the colonies’ survival. The need to define the epidemiological pattern of the pathogens that are involved has led to the establishment of monitoring programs in many countries, Italy included. In this framework, the health status of managed honey bees in the Emilia–Romagna region (northern Italy) was assessed, throughout the year 2021, on workers from 31 apiaries to investigate the presence of major known and emerging honey bee pathogens. The prevalence and abundance of DWV, KBV, ABPV, CBPV, <i>Nosema ceranae</i>, and trypanosomatids (<i>Lotmaria passim, Crithidia mellificae, Crithidia bombi</i>) were assessed by molecular methods. The most prevalent pathogen was DWV, followed by CBPV and <i>N. ceranae.</i> Trypanosomatids were not found in any of the samples. Pathogens had different peaks in abundance over the months, showing seasonal trends that were related to the dynamics of both bee colonies and <i>Varroa destructor</i> infestation. For some of the pathogens, a weak but significant correlation was observed between abundance and geographical longitude. The information obtained in this study increases our understanding of the epidemiological situation of bee colonies in Emilia–Romagna and helps us to implement better disease prevention and improved territorial management of honey bee health.
Afficher plus [+] Moins [-]The Epidemiological Situation of the Managed Honey Bee (Apis mellifera) Colonies in the Italian Region Emilia-Romagna Texte intégral
Giovanni Cilia; Elena Tafi; Laura Zavatta; Valeria Caringi; Antonio Nanetti
The recent decades witnessed the collapse of honey bee colonies at a global level. The major drivers of this collapse include both individual and synergic pathogen actions, threatening the colonies&rsquo: survival. The need to define the epidemiological pattern of the pathogens that are involved has led to the establishment of monitoring programs in many countries, Italy included. In this framework, the health status of managed honey bees in the Emilia&ndash:Romagna region (northern Italy) was assessed, throughout the year 2021, on workers from 31 apiaries to investigate the presence of major known and emerging honey bee pathogens. The prevalence and abundance of DWV, KBV, ABPV, CBPV, Nosema ceranae, and trypanosomatids (Lotmaria passim, Crithidia mellificae, Crithidia bombi) were assessed by molecular methods. The most prevalent pathogen was DWV, followed by CBPV and N. ceranae. Trypanosomatids were not found in any of the samples. Pathogens had different peaks in abundance over the months, showing seasonal trends that were related to the dynamics of both bee colonies and Varroa destructor infestation. For some of the pathogens, a weak but significant correlation was observed between abundance and geographical longitude. The information obtained in this study increases our understanding of the epidemiological situation of bee colonies in Emilia&ndash:Romagna and helps us to implement better disease prevention and improved territorial management of honey bee health.
Afficher plus [+] Moins [-]Volatile biomarkers for non-invasive detection of American foulbrood, a threat to honey bee pollination services Texte intégral
2022
Bikaun, Jessica M. | Bates, Tiffane | Bollen, Maike | Flematti, Gavin R. | Melonek, Joanna | Praveen, Praveen | Grassl, Julia
Honey bees provide essential environmental services, pollinating both agricultural and natural ecosystems that are crucial for human health. However, these pollination services are under threat by outbreaks of the bacterial honey bee disease American foulbrood (AFB). Caused by the bacterium, Paenibacillus larvae, AFB kills honey bee larvae, converting the biomass to a foul smelling, spore-laden mass. Due to the bacterium's tough endospores, which are easily spread and extremely persistent, AFB management requires the destruction of infected colonies in many countries. AFB detection remains a significant problem for beekeepers: diagnosis is often slow, relying on beekeepers visually identifying symptoms in the colony and molecular confirmation. Delayed detection can result in large outbreaks during high-density beekeeping pollination events, jeopardising livelihoods and food security. In an effort to improve diagnostics, we investigated volatile compounds associated with AFB-diseased brood in vitro and in beehive air. Using Solid Phase Microextraction and Gas Chromatography Mass-Spectrometry, we identified 40 compounds as volatile biomarkers for AFB infections, including 16 compounds previously unreported in honey bee studies. In the field, we detected half of the biomarkers in situ (in beehive air) and demonstrated their sensitivity and accuracy for diagnosing AFB. The most sensitive volatile biomarker, 2,5-dimethylpyrazine, was exclusively detected in AFB-disease larvae and hives, and was detectable in beehives with <10 AFB-symptomatic larvae. These, to our knowledge, previously undescribed biomarkers are prime candidates to be targeted by a portable sensor device for rapid and non-invasive diagnosis of AFB in beehives.
Afficher plus [+] Moins [-]Results of an International Survey for Risk Assessment of Honey Bee Health Concerning Varroa Management Texte intégral
2022
Alessandra De Carolis | Adam J. Newmark | Jieun Kim | Joseph Cazier | Ed Hassler | Marco Pietropaoli | Chris Robinette | Giovanni Formato | Junxia Song
Results of an International Survey for Risk Assessment of Honey Bee Health Concerning Varroa Management Texte intégral
2022
Alessandra De Carolis | Adam J. Newmark | Jieun Kim | Joseph Cazier | Ed Hassler | Marco Pietropaoli | Chris Robinette | Giovanni Formato | Junxia Song
Here, we present the results of an online international survey concerning the adoption of good beekeeping practices and proper biosecurity measures for the management of varroosis in Apis mellifera. The survey was designed as a risk assessment tool by the Food and Agriculture Organization of the United Nations (FAO), the International Federation of Beekeepers&rsquo: Association (Apimondia), the Center for Analytics Research &: Education (CARE) at Appalachian State University, and Istituto Zooprofilattico Sperimentale Lazio e Toscana (IZSLT). The data collected investigated the beekeeping techniques, treatments, and training beekeepers adopt concerning the varroa mite. The idea was to validate a tool able to collect and compare, in the different areas of the world, the management measures adopted by beekeepers to face this major parasitic disease of honey bees. The survey was disseminated online for a period of 14 months (January 2019&ndash:March 2020) through the FAO website. A total of 861 responses were received, most of them from the Americas (20.9%) and Europe (74.7%). Concerning the control measures useful in combating varroa, the results showed an overall awareness of the usefulness of biosecurity measures in beekeeping (BMBs), which we compare across regions. The majority of the beekeepers (89.9% in the Americas and 82.8% in Europe) were interested in additional bee health training and, at the same time, were willing to connect themselves with veterinary experts specialized in bees. This is an indication that beekeepers recognize the importance of training and experts&rsquo: advice. This study revealed the efficacy of the survey adopted as a useful assessment tool that will be further disseminated, even in geographic regions heretofore not investigated, to provide useful information on the status of the beekeeping sector.
Afficher plus [+] Moins [-]Results of an International Survey for Risk Assessment of Honey Bee Health Concerning Varroa Management Texte intégral
2022
Alessandra De Carolis | Adam J. Newmark | Jieun Kim | Joseph Cazier | Ed Hassler | Marco Pietropaoli | Chris Robinette | Giovanni Formato | Junxia Song
Here, we present the results of an online international survey concerning the adoption of good beekeeping practices and proper biosecurity measures for the management of varroosis in <i>Apis mellifera</i>. The survey was designed as a risk assessment tool by the Food and Agriculture Organization of the United Nations (FAO), the International Federation of Beekeepers’ Association (Apimondia), the Center for Analytics Research & Education (CARE) at Appalachian State University, and Istituto Zooprofilattico Sperimentale Lazio e Toscana (IZSLT). The data collected investigated the beekeeping techniques, treatments, and training beekeepers adopt concerning the varroa mite. The idea was to validate a tool able to collect and compare, in the different areas of the world, the management measures adopted by beekeepers to face this major parasitic disease of honey bees. The survey was disseminated online for a period of 14 months (January 2019–March 2020) through the FAO website. A total of 861 responses were received, most of them from the Americas (20.9%) and Europe (74.7%). Concerning the control measures useful in combating varroa, the results showed an overall awareness of the usefulness of biosecurity measures in beekeeping (BMBs), which we compare across regions. The majority of the beekeepers (89.9% in the Americas and 82.8% in Europe) were interested in additional bee health training and, at the same time, were willing to connect themselves with veterinary experts specialized in bees. This is an indication that beekeepers recognize the importance of training and experts’ advice. This study revealed the efficacy of the survey adopted as a useful assessment tool that will be further disseminated, even in geographic regions heretofore not investigated, to provide useful information on the status of the beekeeping sector.
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