| comparison of pollen transfer dynamics by multiple floral visitors: experiments with pollen and fluorescent dye. | most plant species are visited by a diversity of floral visitors. pollen transfer of the four most common pollinating bee species and one nectar-robbing bee of the distylous plant gelsemium sempervirens were compared. | 2006 | 16299005 |
| identification of nosema bombi fantham and porter 1914 (microsporidia) in bombus impatiens and bombus sandersoni from great smoky mountains national park (usa). | 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. bombi in one specimen each of b. sandersoni and b. impatiens. sizes and shapes of spores in both n. bombi isolates were similar to those described for european isolates ... | 2010 | 19835879 |
| Patterns of range-wide genetic variation in six North American bumble bee (Apidae: Bombus) species. | The increasing evidence for population declines in bumble bee (Bombus) species worldwide has accelerated research efforts to explain losses in these important pollinators. In North America, a number of once widespread Bombus species have suffered serious reductions in range and abundance, although other species remain healthy. To examine whether declining and stable species exhibit different levels of genetic diversity or population fragmentation, we used microsatellite markers to genotype popul ... | 2011 | 22035452 |
| interspecific geographic distribution and variation of the pathogens nosema bombi and crithidia species in united states bumble bee populations. | 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 10,000 specimens of 36 bumble bee species collected at 284 sites were evaluated for the presence and prevalence of two known bombus pathogens, th ... | 2011 | 22119631 |
| cultivation and characterization of the gut symbionts of honey bees and bumble bees: description of snodgrassella alvi gen. nov., sp. nov., a member of the family neisseriaceae of the betaproteobacteria, and gilliamella apicola gen. nov., sp. nov., a member of orbaceae fam. nov., orbales ord. nov., a sister taxon to the order 'enterobacteriales' of the gammaproteobacteria. | gut-associated bacteria were isolated in axenic culture from the honey bee apis mellifera and the bumble bees bombus bimaculatus and b. vagans and are here placed in the novel genera and species snodgrassella alvi gen. nov., sp. nov. and gilliamella apicola gen. nov., sp. nov. two strains from a. mellifera were characterized and are proposed as the type strains of snodgrassella alvi (type strain wkb2(t) =ncimb 14803(t) =atcc baa-2449(t) =nrrl b-59751(t)) and gilliamella apicola (type strain wkb1 ... | 2013 | 23041637 |
| species differences in bumblebee immune response predict developmental success of a parasitoid fly. | endoparasitoids develop inside the body of a host organism and, if successful, eventually kill their host in order to reach maturity. host species can vary in their suitability for a developing endoparasitoid; in particular, the host immune response, which can suppress egg hatching and larval development, has been hypothesized to be one of the most important determinants of parasitoid host range. in this study, we investigated whether three bumblebee host species (bombus bimaculatus, bombus gris ... | 2015 | 25795253 |