Results 121 to 130 of about 558 (150)

Within colony dynamics ofNosema bombiinfections: disease establishment, epidemiology and potential vertical transmission

Apidologie, 2008
Successful growth and transmission is a prerequisite for a parasite to maintain itself in its host population. Nosema bombi is a ubiquitous and damaging parasite of bumble bees, but little is known about its transmission and epidemiology within bumble bee colonies. The impact of host demography and colony life-cycle on the transmission and reproduction
Rutrecht, Samina T., Brown, Mark J F
openaire   +8 more sources

Interspecific geographic distribution and variation of the pathogens Nosema bombi and Crithidia species in United States bumble bee populations

Journal of Invertebrate Pathology, 2012
Several bumble bee (Bombus) species in North America have undergone range reductions and rapid declines in relative abundance. Pathogens have been suggested as causal factors, however, baseline data on pathogen distributions in a large number of bumble bee species have not been available to test this hypothesis. In a nationwide survey of the US, nearly
Cordes, Nils, Huang, Wei-Fone, Strange, James P., Cameron, Sydney A., Griswold, Terry L., Lozier, Jeffrey D., Solter, Leellen F.   +6 more
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Nosema bombi: A pollinator parasite with detrimental fitness effects

Journal of Invertebrate Pathology, 2007
Nosema bombi is an obligate intracellular parasite that infects different bumblebee species at a substantial, though variable, rate. To date its pathology and impact on host fitness are not well understood. We performed a laboratory experiment investigating the pathology and fitness effects of this parasite on the bumblebee Bombus terrestris.
Oliver Otti, Paul Schmid-Hempel
exaly   +4 more sources

Infection and transmission ofNosema bombiinBombus terrestriscolonies and its effect on hibernation, mating and colony founding

Apidologie, 2008
The impact of the microsporidium Nosema bombi on Bombus terrestris was studied by recording mating, hibernation success, protein titre in haemolymph, weight change during hibernation, and colony founding of queens that were inoculated with N. bombi in the larval phase. Infection with N. bombi was diagnosed in 36% of B.
Steen, J.J.M., van der, Jozef J.M. van der Steen   +1 more
openaire   +2 more sources

The Absence of Nosema bombi in Bumblebees (Bombus spp.) on Farms in Michigan

American Midland Naturalist, 2019
The fungal pathogen Nosema bombi impacts bumblebee fitness and is a factor in population declines throughout North America. Pesticides are also thought to contribute to declines, because they harm the innate immune system of insects, making them more susceptible to disease.
Britton Skuse, Aimee Phillippi, Ellen Batchelder   +2 more
exaly   +2 more sources

Effects of Nosema bombi and its treatment fumagillin on bumble bee (Bombus occidentalis) colonies

Journal of Invertebrate Pathology, 2003
We examined the effects of Nosema bombi (Microsporidia: Nosematidae) on colonies of bumble bees, Bombus occidentalis Greene (Hymenoptera: Apidae), used to pollinate tomatoes in commercial greenhouses. We assessed methods of detecting N. bombi and tested the effectiveness of fumagillin to control this parasite. N.
Robin, Whittington, Mark L, Winston
exaly   +3 more sources

Identification of Nosema bombi Fantham and Porter 1914 (Microsporidia) in Bombus impatiens and Bombus sandersoni from Great Smoky Mountains National Park (USA)

Journal of Invertebrate Pathology, 2010
Ninety three bumble bees belonging to the genus Bombus, subgenus Pyrobombus (three Bombus vagans, seven Bombus bimaculatus, 17 B. sandersoni and 68 B. impatiens) from Great Smoky Mountains National Park were examined for microsporidia. Light microscopy of calcoflour and trichrome-stained smears, and PCR revealed infection with N.
Yuliya Y, Sokolova, Igor M, Sokolov, Christopher E, Carlton   +2 more
openaire   +3 more sources

Molecular characterization ofNosema bombi(Microsporidia: Nosematidae) and a note on its sites of infection inBombus terrestris(Hymenoptera: Apoidea)

Journal of Apicultural Research, 2001
Investigations of queen, worker and male bumble bees (Bombus terrestris) showed that all individuals became infected with Nosema bombi. Infections were found in Malpighian tubules, thorax muscles, fat body tissue and nerve tissue, including the brain ...
Ingemar Fries, Robert J Paxton, Susan B Slemenda   +2 more
exaly   +1 more source

Multiple rRNA Variants in a Single Spore of the Microsporidian Nosema bombi

Journal of Eukaryotic Microbiology, 2007
ABSTRACT. To understand the source of the multiple DNA sequence variants of Nosema bombi ribosomal RNA (rRNA) found in a single bumble bee host, we PCR amplified, cloned, and sequenced the partial rRNA gene from 125 clones, which were derived from four out of 46 spores individually isolated from a single host by laser microdissection.
Elaine M, O'Mahony, Wee Tek, Tay, Robert J, Paxton   +2 more
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Colony success of the bumble bee, Bombus terrestris, in relation to infections by two protozoan parasites, Crithidia bombi and Nosema bombi

Insectes Sociaux, 1999
Crithidia bombi is a prevalent endoparasite of bumblebees that is transmitted both horizontally between and vertically within colonies of its host, the bumble bee Bombus terrestris, and to the next generation. By experimentally infecting or not infecting laboratory-raised colonies with a standard inoculum before their transfer to the field, this study ...
B. Imhoof, P. Schmid-Hempel
openaire   +1 more source