| cytological variation and pathogenicity of the bumble bee parasite nosema bombi (microspora, nosematidae). | in three field seasons, 2003-2005, bumble bees were collected in southern sweden and eastern denmark in search of microsporidian parasites. of the 16 bumble bee species studied, microsporidia were found in bombus hortorum, bombus hypnorum, bombus lapidarius, bombus lucorum, bombus pascuorum, bombus pratorum, bombus ruderarius, bombus subterraneus and bombus terrestris. only one microsporidian species, nosema bombi, was recorded. a microsporidium found in b. pratorum differed cytologically from m ... | 2007 | 17005191 |
| simultaneous determination of juvenile hormone and ecdysteroid titers in the hemolymph of bumblebee prepupae (bombus hypnorum and b. terrestris). | by means of radioimmunoassays the titer of juvenile hormone and ecdysteroids in the hemolymph was simultaneously determined in single prepupae throughout prepupal development. the concentrations of both hormones increase and show a peak, thereafter the titers fall sharply at larval/pupal ecdysis. caste-specific differences in the time sequence of titer changes and in the concentration of jh are discussed. | 1984 | 6745633 |
| comparative study by electrophysiology of olfactory responses in bumblebees (bombus hypnorum andbombus terrestris). | electrophysiological data (eag) were recorded on adult bumblebees stimulated with floral and/or pheromonal pure odorants at different concentrations. the responses of queen, worker, and male bees are compared and the sensitivities of these insects to the pure odorants tested are discussed. | 1984 | 24318903 |
| queen-worker conflict over male production and the sex ratio in a facultatively polyandrous bumblebee, bombus hypnorum: the consequences of nest usurpation. | evolutionary conflicts among social hymenopteran nestmates are theoretically likely to arise over the production of males and the sex ratio. analysis of these conflicts has become an important focus of research into the role of kin selection in shaping social traits of hymenopteran colonies. we employ microsatellite analysis of nestmates of one social hymenopteran, the primitively eusocial and monogynous bumblebee bombus hypnorum, to evaluate these conflicts. in our 14 study colonies, b. hypnoru ... | 2001 | 11742549 |
| parasites and genetic diversity in an invasive bumblebee. | biological invasions are facilitated by the global transportation of species and climate change. given that invasions may cause ecological and economic damage and pose a major threat to biodiversity, understanding the mechanisms behind invasion success is essential. both the release of non-native populations from natural enemies, such as parasites, and the genetic diversity of these populations may play key roles in their invasion success. we investigated the roles of parasite communities, throu ... | 2014 | 24749545 |
| habitat and forage associations of a naturally colonising insect pollinator, the tree bumblebee bombus hypnorum. | bumblebees (bombus species) are major pollinators of commercial crops and wildflowers but factors affecting their abundance, including causes of recent population declines, remain unclear. investigating the ecology of species with expanding ranges provides a potentially powerful means of elucidating these factors. such species may also bring novel pollination services to their new ranges. we therefore investigated landscape-scale habitat use and foraging preferences of the tree bumblebee, b. hyp ... | 2014 | 25259579 |
| mapping species distributions: a comparison of skilled naturalist and lay citizen science recording. | to assess the ability of traditional biological recording schemes and lay citizen science approaches to gather data on species distributions and changes therein, we examined bumblebee records from the uk's national repository (national biodiversity network) and from beewatch. the two recording approaches revealed similar relative abundances of bumblebee species but different geographical distributions. for the widespread common carder (bombus pascuorum), traditional recording scheme data were pa ... | 2015 | 26508346 |
| interspecific variation in bumblebee performance on pollen diet: new insights for mitigation strategies. | bumblebees (i.e. bombus genus) are major pollinators of flowering wild plants and crops. although many species are currently in decline, a number of them remain stable or are even expanding. one factor potentially driving changes in bumblebee distribution is the suitability of plant communities. actually, bees probably have specific nutritional requirements that could shape their floral choices and constraint them in the current context of global change. however, most studies primarily focus on ... | 2016 | 28005943 |
| the abundance and pollen foraging behaviour of bumble bees in relation to population size of whortleberry (vaccinium uliginosum). | habitat fragmentation can have severe effects on plant pollinator interactions, for example changing the foraging behaviour of pollinators. to date, the impact of plant population size on pollen collection by pollinators has not yet been investigated. from 2008 to 2010, we monitored nine bumble bee species (bombus campestris, bombus hortorum s.l., bombus hypnorum, bombus lapidarius, bombus pascuorum, bombus pratorum, bombus soroensis, bombus terrestris s.l., bombus vestalis s.l.) on vaccinium ul ... | 2012 | 23209721 |
| bifidobacterium commune sp. nov. isolated from the bumble bee gut. | bifidobacteria were isolated from the gut of bombus lapidarius, bombus terrestris and bombus hypnorum bumble bees by direct isolation on modified trypticase phytone yeast extract agar. the maldi-tof ms profiles of four isolates (lmg 28292(t), r-53560, r-53124, lmg 28626) were found to be identical and did not cluster with the profiles of established bifidobacterium species. analysis of the 16s rrna gene sequence of strain lmg 28292(t) revealed that lmg 28292(t) is most closely related to the bif ... | 2015 | 25753540 |
| queen-controlled sex ratios and worker reproduction in the bumble bee bombus hypnorum, as revealed by microsatellites. | social insect colonies provide model systems for the examination of conflicts among parties with different genetic interests. as such, they have provided the best tests of inclusive fitness theory. however, much remains unknown about in which party's favour such conflicts are resolved, partly as a result of the only recent advent of the molecular tools needed to examine the outcome of these conflicts. two key conflicts in social insect colonies are over control of the reproductive sex ratio and ... | 2003 | 12755887 |