Publications

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apicystis bombi (apicomplexa: neogregarinorida) parasitizing apis mellifera and bombus terrestris (hymenoptera: apidae) in argentina.the neogregarine apicystis bombi is considered a low prevalence parasite of bombus spp. before our work it has only once been detected in one single specimen of the western honeybee apis mellifera. this contribution reports the presence of a. bombi parasitizing both a. mellifera and bombus terrestris at a site in northwestern argentine patagonia (bariloche, close to the border with chile) and analyses its possible absence in the pampas region, the most important beekeeping region of the country. ...201123761336
comprehensive bee pathogen screening in belgium reveals crithidia mellificae as a new contributory factor to winter mortality.since the last decade, unusually high honey bee colony losses have been reported mainly in north-america and europe. here, we report on a comprehensive bee pathogen screening in belgium covering 363 bee colonies that were screened for 18 known disease-causing pathogens and correlate their incidence in summer with subsequent winter mortality. our analyses demonstrate that, in addition to varroa destructor, the presence of the trypanosomatid parasite crithidia mellificae and the microsporidian par ...201323991113
genetic variability of the neogregarine apicystis bombi, an etiological agent of an emergent bumblebee disease.the worldwide spread of diseases is considered a major threat to biodiversity and a possible driver of the decline of pollinator populations, particularly when novel species or strains of parasites emerge. previous studies have suggested that populations of introduced european honeybee (apis mellifera) and bumblebee species (bombus terrestris and bombus ruderatus) in argentina share the neogregarine parasite apicystis bombi with the native bumblebee (bombus dahlbomii). in this study we investiga ...201324324696
the relationship between managed bees and the prevalence of parasites in bumblebees.honey bees and, more recently, bumblebees have been domesticated and are now managed commercially primarily for crop pollination, mixing with wild pollinators during foraging on shared flower resources. there is mounting evidence that managed honey bees or commercially produced bumblebees may affect the health of wild pollinators such as bumblebees by increasing competition for resources and the prevalence of parasites in wild bees. here we screened 764 bumblebees from around five greenhouses th ...201425165632
absence of leishmaniinae and nosematidae in stingless bees.bee pollination is an indispensable component of global food production and plays a crucial role in sustainable agriculture. the worldwide decline of bee populations, including wild pollinators, poses a threat to this system. however, most studies to date are situated in temperate regions where apini and bombini are very abundant pollinators. tropical and subtropical regions where stingless bees (apidae: meliponini) are generally very common, are often overlooked. these bees also face pressure d ...201627586080
unbiased rna shotgun metagenomics in social and solitary wild bees detects associations with eukaryote parasites and new viruses.the diversity of eukaryote organisms and viruses associated with wild bees remains poorly characterized in contrast to the well-documented pathosphere of the western honey bee, apis mellifera. using a deliberate rna shotgun metagenomic sequencing strategy in combination with a dedicated bioinformatics workflow, we identified the (micro-)organisms and viruses associated with two bumble bee hosts, bombus terrestris and bombus pascuorum, and two solitary bee hosts, osmia cornuta and andrena vaga. i ...201628006002
long-term prevalence of the protists crithidia bombi and apicystis bombi and detection of the microsporidium nosema bombi in invasive bumble bees.an initial survey in 2009 carried out at a site in northwestern patagonia region, argentina, revealed for the first time in south america the presence of the flagellate crithidia bombi and the neogregarine apicystis bombi, two pathogens associated with the palaearctic invasive bumble bee bombus terrestris. in order to determine the long-term persistence and dynamics of this microparasite complex, four additional collections at the same site (san carlos de bariloche) were conducted along the foll ...201728085231
molecular and phylogenetic characterization of honey bee viruses, nosema microsporidia, protozoan parasites, and parasitic mites in china.china has the largest number of managed honey bee colonies, which produce the highest quantity of honey and royal jelly in the world; however, the presence of honey bee pathogens and parasites has never been rigorously identified in chinese apiaries. we thus conducted a molecular survey of honey bee rna viruses, nosema microsporidia, protozoan parasites, and tracheal mites associated with nonnative apis mellifera ligustica and native apis cerana cerana colonies in china. we found the presence of ...201323467539
bee pathogens found in bombus atratus from colombia: a case study.bombus atratus bumblebees from colombia that were caught in the wild and from breeding programs were screened for a broad set of bee pathogens. we discovered for the first time lake sinai virus and confirmed the infection by other common viruses. the prevalence of apicystis bombi, crithidia bombi and nosema ceranae was remarkably high. according to other studies the former two could have been co-introduced in south america with exotic bumble bees as bombus terrestris or bombus ruderatus. given t ...201526031564
effects of invasive parasites on bumble bee declines.bumble bees are a group of pollinators that are both ecologically and economically important and declining worldwide. numerous mechanisms could be behind this decline, and the spread of parasites from commercial colonies into wild populations has been implicated recently in north america. commercial breeding may lead to declines because commercial colonies may have high parasite loads, which can lead to colonization of native bumble bee populations; commercial rearing may allow higher parasite v ...201121771075
multiplex pcr detection of slowly-evolving trypanosomatids and neogregarines in bumblebees using broad-range primers.the aims of this study were to design universal markers for different protozoan parasites of bombus spp. based on the phylogenetic position of two important bumblebee parasites crithidia bombi and apicystis bombi.201020015206
the effects of single and mixed infections of apicystis bombi and deformed wing virus in bombus terrestris.many pollinators are currently suffering from declines, diminishing their gene pool and increasing their vulnerability to parasites. recently, an increasing diversity of parasites has been recorded in bumblebees, yet for many, knowledge of their virulence and hence the risk their presence poses, is lacking. the deformed wing virus (dwv), known to be ubiquitous in honey bees, has now been detected in bumblebees. in addition, the neogregarine apicystis bombi has been discovered to be more prevalen ...201626646676
large pathogen screening reveals first report of megaselia scalaris (diptera: phoridae) parasitizing apis mellifera intermissa (hymenoptera: apidae).as it is most likely that global warming will also lead to a shift in pollinator-habitats northwards, the study of southern species becomes more and more important. pathogen screenings in subspecies of apis mellifera capable of withstanding higher temperatures, provide an insight into future pathogen host interactions. screenings in different climate regions also provide a global perspective on the prevalence of certain pathogens. in this project, we performed a pathogen screening in apis mellif ...201627130035
molecular detection of protozoan parasites infecting apis mellifera colonies in japan.the role of protozoan parasites in honey bee health and distribution in the world is not well understood. therefore, we carried out a molecular survey for the presence of crithidia mellificae and apicystis bombi in the colonies of both non-native apis mellifera and native apis cerana japonica in japan. we found that a. mellifera, but not a. c. japonica, colonies are parasitized with c. mellificae and a. bombi. their absence in a. c. japonica colonies indicates that a. mellifera is their native h ...201223757133
invasive bombus terrestris (hymenoptera: apidae) parasitized by a flagellate (euglenozoa: kinetoplastea) and a neogregarine (apicomplexa: neogregarinorida).the flagellate crithidia bombi and the neogregarine apicystis bombi have been found in individuals of bombus terrestris, a palaearctic species of bumble bee commercially reared and shipped worldwide for pollination services. b. terrestris has recently entered into the northwestern patagonia region of argentina from chile, where it was introduced in 1998. prevalence was 21.6% for c. bombi and 3.6% for a. bombi (n=111). the pathogens were not detected in 441 bumble bees belonging to five of the ei ...200919682459
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