About: Xylocopa violacea is a(n) research topic. Over the lifetime, 23 publication(s) have been published within this topic receiving 209 citation(s). The topic is also known as: violet carpenter bee & Carpenter bee.
TL;DR: Morphological investigations were conducted on male antennae of three Apidae species, Apis mellifera, Bombus pascuorum and Xylocopa violacea, with some differences regarding both external morphological characters and internal cytological features.
Abstract: Morphological investigations were conducted on male antennae of three Apidae species, Apis mellifera, Bombus pascuorum and Xylocopa violacea. Male antennal glands were present in all species, with some differences regarding both external morphological characters and internal cytological features. There are externally obvious sites of pheromonal release (provided with evident pores) in B. pascuorum and X. violacea males, while pores are lacking in A. mellifera males. Internally A. mellifera presents a glandular complex composed of class 1 secretory cells, while the two other species possess two types of glands (with class 1 and class 3 secretory cells) associated with the same release sites. The functional hypothesis for the secretion of these glands is that they may act as a sex pheromone during courtship behaviour. Apis / Bombus / Xylocopa / gland / ultrastructure / sex recognition
TL;DR: Nous avons etudie les aspects fondamentaux de la reproduction and de the pollinisation de Lonicera etrusca G. Santi (Caprifoliaceae) dans le nord-ouest of the Peninsule Iberique dans les resultats indiquent que l'espece est auto-compatible et que ses fleurs sont dichogames.
Abstract: As studied in NW Spain, this honesuckle is self-compatible and its flowers are dichogamous. Fruit production requires insect pollination. Levels of fruit-set following xenogamous and geitonogamous pollen transer (65.5% and 43.1%) respectively) did not differ significantly from controls (53.8%). The principal flower visitors were Bombus terrestris (51.4% of visits), Xylocopa violacea (18.6%) and Macroglossum stellatarum (8.2%). Fruit-set was 3.5 times higher when only diurnal pollination was allowed than when only nocturnal pollination was allowed. -from Authors
TL;DR: Specialization of the personate flower of Antirrhinum is interpreted for bees with both large bodies and high visitation indices, suggesting that these bee guilds are effective pollinators of the three self-incompatible Antirkhinum species.
Abstract: This paper provides the first results of pollinator fauna associated to the reproductive biology of Antirrhinum charidemi, Antirrhinum graniticum and Antirrhinum braun-blanquetii. Censuses of over 16 hours spanning the flowering phenology of each species were drawn up. As previously hypothesized, the characteristic occluded (personate) corolla of Antirrhinum was exclusively pollinated by bees, but by a higher number (four) of bee families than predicted. Seven bee species (Bombus hortorum, Anthidium manicatum, Chalicodoma lefebvrei, Anthidium sticticum, Anthophora dispar, Xylocopa violacea and Anthidium cingulatum) account for over 90% of flower visits (2098). The flower visitation index varied between species (0.0126−0.0320), reaching relatively medium values compared to Mediterranean plants. In contrast, reproductive success was found to be high when estimated as both fruit (45.4–84.2%) and seed (75.4–98.4%) sets, suggesting that these bee guilds are effective pollinators of the three self-incompatible ...
TL;DR: The incidence of nectar robbing by Xylocopa violacea differed between the four plant populations studied, and it had significant effects on fruit set when the population was simultaneously considered and Supplementary pollination did not improve fruit set significantly.
Abstract: Petrocoptis grandiflora Rothm. is a species endemic to the Iberian Peninsula with restricted distribution. We studied various aspects of its pollination ecology: nectar characteristics and standing crop, pollinators and nectar-robbers, and the effects of nectar robbing and supplementary pollination on fruit set. The nectar is moderately rich in saccharose (saccharose/hexose ratio 0.54), and is largely consumed by long-tongued bees (Anthophoridae). The incidence of nectar robbing by Xylocopa violacea differed between the four plant populations studied, and it had significant effects on fruit set when the population was simultaneously considered. Supplementary pollination did not improve fruit set significantly.
TL;DR: The results support the proposal of two novel species Bifidobacterium xylocopae sp.
Abstract: Social bees harbor a community of gut mutualistic bacteria, among which bifidobacteria occupy an important niche. Recently, four novel species have been isolated from guts of different bumblebees, thus allowing to suppose that a core bifidobacterial population may be present in wild solitary bees. To date there is sparse information about bifidobacteria in solitary bees such as Xylocopa and Osmia spp., this study is therefore focused on the isolation and characterization of bifidobacterial strains from solitary bees, in particular carpenter bee (Xylocopa violacea), builder bee (Osmia cornuta), and red mason bee (Osmia rufa). Among the isolates from Osmia spp. no new species have been detected whereas among Xylocopa isolates four strains (XV2, XV4, XV10, XV16) belonging to putative new species were found. Isolated strains are Gram-positive, lactate- and acetate-producing and possess the fructose-6-phosphate phosphoketolase enzyme. Full genome sequencing and genome annotation were performed for XV2 and XV10. Phylogenetic relationships were determined using partial and complete 16S rRNA sequences and hsp60 restriction analysis that confirmed the belonging of the new strains to Bifidobacterium genus and the relatedness of the strains XV2 and XV10 with XV16 and XV4, respectively. Phenotypic tests were performed for the proposed type strains, reference strains and their closest neighbor in the phylogenetic tree. The results support the proposal of two novel species Bifidobacterium xylocopae sp. nov. whose type strain is XV2 (=DSM 104955T = LMG 30142T), reference strain XV16 and Bifidobacterium aemilianum sp. nov. whose type strain is XV10 (=DSM 104956T = LMG 30143T), reference strain XV4.