Guy Bloch
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View article: The alkenes Z9-C29 and Z9-C31 function as quorum-sensing pheromones stimulating worker reproduction in the bumble bee Bombus terrestris
The alkenes Z9-C29 and Z9-C31 function as quorum-sensing pheromones stimulating worker reproduction in the bumble bee Bombus terrestris Open
Division of labor in reproduction in eusocial insects is governed by delicate and context- dependent mechanisms, yet the regulatory processes remain largely unclear. Here, we investigate social cues involved in the establishment of reprodu…
View article: Precocene-I mediated reduction of juvenile hormone titers and ovarian activity is ephemeral in a bumble bee
Precocene-I mediated reduction of juvenile hormone titers and ovarian activity is ephemeral in a bumble bee Open
Juvenile hormones (JHs) are key insect endocrine signals regulating pre-adult development and adult life history strategies, physiology, and behavior. The importance of this endocrine signal has led to the development of insecticides targe…
View article: Sex-Related Variation in Circadian Rhythms in the Bumble Bee <i>Bombus terrestris</i>
Sex-Related Variation in Circadian Rhythms in the Bumble Bee <i>Bombus terrestris</i> Open
Mating success depends on many factors, but first of all, a male and a female need to meet at the same place and time. The circadian clock is an endogenous system regulating activity and sex-related behaviors in animals. We studied bumble …
View article: Data-driven analyses of social complexity in bees reveal phenotypic diversification following a major evolutionary transition
Data-driven analyses of social complexity in bees reveal phenotypic diversification following a major evolutionary transition Open
How social complexity evolved is a long-standing enigma. In most animal groups, social complexity is typically classified into a few discrete classes. This approach is oversimplified and constrains our inference of social evolution to a na…
View article: Substances in the mandibular glands mediate queen effects on larval development and colony organization in an annual bumble bee
Substances in the mandibular glands mediate queen effects on larval development and colony organization in an annual bumble bee Open
Social organization is commonly dynamic, with extreme examples in annual social insects, but little is known about the underlying signals and mechanisms. Bumble bee larvae with close contact to a queen do not differentiate into gynes, pupa…
View article: Bumble Bees (Bombus terrestris) Use Time-Memory to Associate Reward with Color and Time of Day
Bumble Bees (Bombus terrestris) Use Time-Memory to Associate Reward with Color and Time of Day Open
Circadian clocks regulate ecologically important complex behaviors in honey bees, but it is not clear whether similar capacities exist in other species of bees. One key behavior influenced by circadian clocks is time-memory, which enables …
View article: Bumble bees (<i>Bombus terrestris</i>) use time-memory to associate reward with color and time of day
Bumble bees (<i>Bombus terrestris</i>) use time-memory to associate reward with color and time of day Open
Circadian clocks regulate ecologically important complex behaviors in honey bees but it is not clear to what extent these observations can be extended to other species of bees. One key behavior is time-memory allowing foraging bees to prec…
View article: Field-realistic concentrations of a neonicotinoid insecticide influence socially regulated brood development in a bumblebee
Field-realistic concentrations of a neonicotinoid insecticide influence socially regulated brood development in a bumblebee Open
The systemic neonicotinoid insecticides are considered as one of the key culprits contributing to ongoing declines in pollinator health and abundance. Bumblebees are among the most important pollinators of temperate zone plants, making the…
View article: The Influences of Illumination Regime on Egg-laying Rhythms of Honey Bee Queens
The Influences of Illumination Regime on Egg-laying Rhythms of Honey Bee Queens Open
Honey bee queens show extreme fecundity, commonly laying more than a thousand eggs in a single day. It has proven challenging to study the temporal organization of egg-laying behavior because queens are typically active around the clock in…
View article: Earlier Morning Arrival to Pollen-Rewarding Flowers May Enable Feral Bumble Bees to Successfully Compete with Local Bee Species and Expand Their Distribution Range in a Mediterranean Habitat
Earlier Morning Arrival to Pollen-Rewarding Flowers May Enable Feral Bumble Bees to Successfully Compete with Local Bee Species and Expand Their Distribution Range in a Mediterranean Habitat Open
During recent decades, bumble bees (Bombus terrestris) have continuously expanded their range in the Mediterranean climate regions of Israel. To assess their potential effects on local bee communities, we monitored their diurnal and season…
View article: Remarkable Sensitivity of Young Honey Bee Workers to Multiple Non-photic, Non-thermal, Forager Cues That Synchronize Their Daily Activity Rhythms
Remarkable Sensitivity of Young Honey Bee Workers to Multiple Non-photic, Non-thermal, Forager Cues That Synchronize Their Daily Activity Rhythms Open
Honey bees live in colonies containing tens of thousands of workers that coordinate their activities to produce efficient colony-level behavior. In free-foraging colonies, nest bees are entrained to the forager daily phase of activity even…
View article: Krüppel-homologue 1 Mediates Hormonally Regulated Dominance Rank in a Social Bee
Krüppel-homologue 1 Mediates Hormonally Regulated Dominance Rank in a Social Bee Open
Dominance hierarchies are ubiquitous in invertebrates and vertebrates, but little is known on how genes influence dominance rank. Our gaps in knowledge are specifically significant concerning female hierarchies, particularly in insects. To…
View article: Krüppel-Homologue 1 Mediates Hormonally-Regulated Dominance Rank in a Social Insect
Krüppel-Homologue 1 Mediates Hormonally-Regulated Dominance Rank in a Social Insect Open
Dominance hierarchies are ubiquitous in invertebrates and vertebrates, but little is known on how genes influence dominance rank. Our gaps in knowledge are specifically significant concerning female hierarchies and in insects. To start fil…
View article: Social synchronization of circadian rhythms with a focus on honeybees
Social synchronization of circadian rhythms with a focus on honeybees Open
Many animals benefit from synchronizing their daily activities with conspecifics. In this hybrid paper, we first review recent literature supporting and extending earlier evidence for a lack of clear relationship between the level of socia…
View article: Body Size and Behavioural Plasticity Interact to Influence the Performance of Free-Foraging Bumble Bee Colonies
Body Size and Behavioural Plasticity Interact to Influence the Performance of Free-Foraging Bumble Bee Colonies Open
Specialisation and plasticity are important for many forms of collective behaviour, but the interplay between these factors is little understood. In insect societies, workers are often developmentally primed to specialise in different task…
View article: Brain microRNAs among social and solitary bees
Brain microRNAs among social and solitary bees Open
Evolutionary transitions to a social lifestyle in insects are associated with lineage-specific changes in gene expression, but the key nodes that drive these regulatory changes are unknown. We examined the relationship between social organ…
View article: Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (<i>Bombus terrestris</i>) workers
Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (<i>Bombus terrestris</i>) workers Open
The circadian and endocrine systems influence many physiological processes in animals, but little is known on the ways they interact in insects. We tested the hypothesis that juvenile hormone (JH) influences circadian rhythms in the social…
View article: Is diversity in worker body size important for the performance of bumble bee colonies?
Is diversity in worker body size important for the performance of bumble bee colonies? Open
Specialization and plasticity are important for many forms of collective behavior, but the interplay between these factors is little understood. In insect societies, workers are often predisposed to specialize in different tasks, sometimes…
View article: The evolution of extreme fertility defied ancestral gonadotropin mediated brain-reproduction tradeoff
The evolution of extreme fertility defied ancestral gonadotropin mediated brain-reproduction tradeoff Open
Gonadotropic hormones coordinate processes in diverse tissues regulating animal reproductive physiology and behavior. Juvenile hormone (JH) is the ancient and most common gonadotropin in insects, but not in advanced eusocial honey bees and…
View article: Circadian plasticity in honey bees
Circadian plasticity in honey bees Open
Circadian rhythms of about a day are ubiquitous in animals and considered functionally significant. Honey bees show remarkable circadian plasticity that is related to the complex social organization of their societies. Forager bees show ro…
View article: Table S6 from Brain microRNAs among social and solitary bees
Table S6 from Brain microRNAs among social and solitary bees Open
Results from genome scans for miRNA seed matches in Rfam. Descriptions for each sheet and column header are provided in the ‘Metadata’ sheet.
View article: Table S5 from Brain microRNAs among social and solitary bees
Table S5 from Brain microRNAs among social and solitary bees Open
Enrichment results for predicted targets of lineage-specific miRs and “social genes”. Includes gene lists, conversion lists based on reciprocal blastp results, and overlap test statistics. Column head descriptions are in ‘ColumnDetails’ sh…
View article: Figure S1 from Brain microRNAs among social and solitary bees
Figure S1 from Brain microRNAs among social and solitary bees Open
Predicted targets of lineage-specific miRNAs in relation to social behavior. Genes that are both predicted targets of lineage-specific miRNAs and genes with differential expression in a social context (solid outlines) or genes under select…
View article: Supplementary material from "Brain microRNAs among social and solitary bees"
Supplementary material from "Brain microRNAs among social and solitary bees" Open
Evolutionary transitions to a social lifestyle in insects are associated with lineage-specific changes in gene expression, but the key nodes that drive these regulatory changes are unknown. We examined the relationship between social organ…
View article: Table S5 from Brain microRNAs among social and solitary bees
Table S5 from Brain microRNAs among social and solitary bees Open
Enrichment results for predicted targets of lineage-specific miRs and “social genes”. Includes gene lists, conversion lists based on reciprocal blastp results, and overlap test statistics. Column head descriptions are in ‘ColumnDetails’ sh…
View article: Table S8 from Brain microRNAs among social and solitary bees
Table S8 from Brain microRNAs among social and solitary bees Open
Predicted targets and orthogroup ages of lineage-specific microRNAs in each species. Descriptions for each sheet and column header are provided in the ‘Metadata’ sheet.