George D. Yocum
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View article: Hypoxia extends lifespan but does not alter telomere length or oxidative stress in a solitary bee (<i>Megachile rotundata</i>)
Hypoxia extends lifespan but does not alter telomere length or oxidative stress in a solitary bee (<i>Megachile rotundata</i>) Open
Stress can influence lifespan in both positive and negative ways, depending on exposure intensity and duration. However, mechanisms driving positive stress effects on lifespan remain poorly understood. Prolonged hypoxia extends the lifespa…
View article: Environmentally acquired gut-associated bacteria are not critical for growth and survival in a solitary bee, <i>Megachile rotundata</i>
Environmentally acquired gut-associated bacteria are not critical for growth and survival in a solitary bee, <i>Megachile rotundata</i> Open
Social bees have been extensively studied for their gut microbial functions, but the significance of the gut microbiota in solitary bees remains less explored. Solitary bee, Megachile rotundata females provision their offspring with pollen…
View article: Environmentally acquired gut-associated bacteria are not critical for growth and survival in a solitary bee, Megachile rotundata
Environmentally acquired gut-associated bacteria are not critical for growth and survival in a solitary bee, Megachile rotundata Open
Background Social bees have been studied extensively for their gut microbial symbiosis and its beneficial functions to the host’s health. But the significance of the environmentally acquired, non-symbiotic gut microbiota in solitary bees r…
View article: Microbiome Dynamics Influence Larval Nutrition, Survival and Endosymbiont Abundance in the Solitary Bee, Megachile rotundata
Microbiome Dynamics Influence Larval Nutrition, Survival and Endosymbiont Abundance in the Solitary Bee, Megachile rotundata Open
Social bees have been extensively studied for their gut microbial functions, but the significance of the gut microbiota in solitary bees remain less explored. Solitary bee, Megachile rotundata F. females provision their offspring with poll…
View article: Identification of sex-specific markers based on gene expression in adult Colorado potato beetles
Identification of sex-specific markers based on gene expression in adult Colorado potato beetles Open
The Colorado potato beetle, Leptinotarsa decemlineata, (Coleoptera: Chrysomelidae) is an economically important pest insect of potatoes. Understanding how the mechanisms driving its invasiveness vary between sexes will be critical for deve…
View article: Effects of developmental state on low-temperature physiology of the alfalfa leafcutting bee, <i>Megachile rotundata</i>
Effects of developmental state on low-temperature physiology of the alfalfa leafcutting bee, <i>Megachile rotundata</i> Open
The success of agriculture relies on healthy bees to pollinate crops. Commercially managed pollinators are often kept under temperature-controlled conditions to better control development and optimize field performance. One such pollinator…
View article: Effects of Temperature and Wildflower Strips on Survival and Macronutrient Stores of the Alfalfa Leafcutting Bee (Hymenoptera: Megachilidae) Under Extended Cold Storage
Effects of Temperature and Wildflower Strips on Survival and Macronutrient Stores of the Alfalfa Leafcutting Bee (Hymenoptera: Megachilidae) Under Extended Cold Storage Open
Megachile rotundata (F.) is an important pollinator of alfalfa in the United States. Enhancing landscapes with wildflowers is a primary strategy for conserving pollinators and may improve the sustainability of M. rotundata. Changing cold s…
View article: Timing of Diapause Initiation and Overwintering Conditions Alter Gene Expression Profiles in Megachile rotundata
Timing of Diapause Initiation and Overwintering Conditions Alter Gene Expression Profiles in Megachile rotundata Open
Within the United States and Canada, the primary pollinator of alfalfa is the alfalfa leafcutting bee (ALCB), Megachile rotundata . Our previous findings showed that overwintering conditions impacted gene expression profile in ALCB prepupa…
View article: Environmental impacts on diapause and survival of the alfalfa leafcutting bee, Megachile rotundata
Environmental impacts on diapause and survival of the alfalfa leafcutting bee, Megachile rotundata Open
Megachile rotundata exhibits a facultative prepupal diapause but the cues regulating diapause initiation are not well understood. Possible cues include daylength and temperature. Megachile rotundata females experience changing daylengths o…
View article: Fluctuating thermal regimes extend longevity and maintain fecundity to increase shelf‐life of <i>Drosophila melanogaster</i> cultures
Fluctuating thermal regimes extend longevity and maintain fecundity to increase shelf‐life of <i>Drosophila melanogaster</i> cultures Open
Reduced temperatures increase longevity in cold‐tolerant insects, but insects that are not cold‐tolerant experience elevated mortality at constant low temperatures. Fluctuating thermal regimes (FTRs) increase longevity in many insect speci…
View article: Body and Wing Allometries Reveal Flight-Fecundity Tradeoff in Response to Larval Provisioning in <i>Osmia lignaria</i> (Hymenoptera: Megachilidae)
Body and Wing Allometries Reveal Flight-Fecundity Tradeoff in Response to Larval Provisioning in <i>Osmia lignaria</i> (Hymenoptera: Megachilidae) Open
Variation in body size has important implications for physical performance and fitness. For insects, adult size and morphology are determined by larval growth and metamorphosis. Female blue orchard bees, Osmia lignaria, (Say) provision a f…
View article: Overwintering conditions impact insulin pathway gene expression in diapausing Megachile rotundata
Overwintering conditions impact insulin pathway gene expression in diapausing Megachile rotundata Open
Diapause is a non-feeding state that many insects undergo to survive the winter months. With fixed resources, overall metabolism and insulin signaling (IIS) are maintained at low levels, but whether those change in response to seasonal tem…
View article: Diet quantity influences caste determination in honeybees ( <i>Apis mellifera</i> )
Diet quantity influences caste determination in honeybees ( <i>Apis mellifera</i> ) Open
In species that care for their young, provisioning has profound effects on offspring fitness. Provisioning is important in honeybees because nutritional cues determine whether a female becomes a reproductive queen or sterile worker. A qual…
View article: Microclimate Temperatures Impact Nesting Preference in Megachile rotundata (Hymenoptera: Megachilidae)
Microclimate Temperatures Impact Nesting Preference in Megachile rotundata (Hymenoptera: Megachilidae) Open
The temperature of the nest influences fitness in cavity-nesting bees. Females may choose nest cavities that mitigate their offspring’s exposure to stressful temperatures. This study aims to understand how cavity temperature impacts the ne…
View article: Table S1 from Diet quantity influences caste determination in honeybees (<i>Apis mellifera</i>)
Table S1 from Diet quantity influences caste determination in honeybees (<i>Apis mellifera</i>) Open
Survival by treatment
View article: Thermoprofile Parameters Affect Survival of Megachile rotundata During Exposure to Low-Temperatures
Thermoprofile Parameters Affect Survival of Megachile rotundata During Exposure to Low-Temperatures Open
Insects exposed to low temperature stress can experience chill injury, but incorporating fluctuating thermoprofiles increases survival and blocks the development of sub-lethal effects. The specific parameters required for a protective ther…
View article: Immediate Transcriptional Response to a Temperature Pulse under a Fluctuating Thermal Regime
Immediate Transcriptional Response to a Temperature Pulse under a Fluctuating Thermal Regime Open
The response of ectotherms to temperature stress is complex, non-linear, and is influenced by life stage and previous thermal exposure. Mortality is higher under constant low temperatures than under a fluctuating thermal regime (FTR) that …
View article: Long-Distance Transportation Causes Temperature Stress in the Honey Bee, Apis mellifera (Hymenoptera: Apidae)
Long-Distance Transportation Causes Temperature Stress in the Honey Bee, Apis mellifera (Hymenoptera: Apidae) Open
Pollination services provided by the honey bee, Apis mellifera (Hymenoptera: Apidae, Linnaeus, 1758) have broad economic impacts and are necessary for production of a diversity of important crops. Hives may be transported multiple times pe…
View article: A Precise and Autonomous System for the Detection of Insect Emergence Patterns
A Precise and Autonomous System for the Detection of Insect Emergence Patterns Open
Existing systems to measure insect emergence patterns have limitations; they are only partially automated and are limited in the maximum number of emerging insects they can detect. In order to obtain precise measurement of insect emergence…
View article: Mechanisms underpinning the beneficial effects of fluctuating thermal regimes in insect cold tolerance
Mechanisms underpinning the beneficial effects of fluctuating thermal regimes in insect cold tolerance Open
Insects exposed to low temperature often have high mortality or exhibit sublethal effects. A growing number of recent studies have shown beneficial effects of exposing insects to recurrent brief warm pulses during low-temperature stress (f…
View article: Micro-computed tomography of pupal metamorphosis in the solitary bee Megachile rotundata
Micro-computed tomography of pupal metamorphosis in the solitary bee Megachile rotundata Open
Insect metamorphosis involves a complex change in form and function. In this study, we examined the development of the solitary bee, Megachile rotundata, using micro-computed tomography (μCT) and volume analysis. We describe volumetric cha…
View article: Cues for cavity nesters: investigating relevant zeitgebers for emerging leafcutting bees, <i>Megachile rotundata</i>
Cues for cavity nesters: investigating relevant zeitgebers for emerging leafcutting bees, <i>Megachile rotundata</i> Open
Photoperiod is considered the universal zeitgeber, regulating physiological processes in numerous animals. However, for animals in light-restricted habitats (e.g. burrows or cavities), thermoperiod may be a more important cue. Our study te…
View article: Environmental history impacts gene expression during diapause development in the alfalfa leafcutting bee,<i>Megachile rotundata</i>
Environmental history impacts gene expression during diapause development in the alfalfa leafcutting bee,<i>Megachile rotundata</i> Open
Our understanding of the mechanisms controlling insect diapause has increased dramatically with the introduction of global gene expression techniques, such as RNA-seq. However, little attention has been given to how ecologically relevant f…
View article: Metamorphosis is induced by food absence rather than a critical weight in the solitary bee,<i>Osmia lignaria</i>
Metamorphosis is induced by food absence rather than a critical weight in the solitary bee,<i>Osmia lignaria</i> Open
Significance In this study, we characterize the developmental mechanisms shaping body size in the solitary bee pollinator, Osmia lignaria . This study manipulates larval development in a solitary bee to understand how developmental mechani…
View article: A model species for agricultural pest genomics: the genome of the Colorado potato beetle,<i>Leptinotarsa decemlineata</i>(Coleoptera: Chrysomelidae)
A model species for agricultural pest genomics: the genome of the Colorado potato beetle,<i>Leptinotarsa decemlineata</i>(Coleoptera: Chrysomelidae) Open
The Colorado potato beetle is one of the most challenging agricultural pests to manage. It has shown a spectacular ability to adapt to a variety of solanaceaeous plants and variable climates during its global invasion, and, notably, to rap…
View article: Physiological responses to fluctuating temperatures are characterized by distinct transcriptional profiles in a solitary bee
Physiological responses to fluctuating temperatures are characterized by distinct transcriptional profiles in a solitary bee Open
Exposure to stressful low temperatures during development can result in the accumulation of deleterious physiological effects called chill injury. Metabolic imbalances, disruptions in ion homeostasis, and oxidative stress contribute to the…
View article: The geometric framework for nutrition reveals interactions between protein and carbohydrate during larval growth in honey bees
The geometric framework for nutrition reveals interactions between protein and carbohydrate during larval growth in honey bees Open
In holometabolous insects, larval nutrition affects adult body size, a life history trait with a profound influence on performance and fitness. Individual nutritional components of larval diets are often complex and may interact with one a…
View article: Genome of the Asian longhorned beetle (Anoplophora glabripennis), a globally significant invasive species, reveals key functional and evolutionary innovations at the beetle–plant interface
Genome of the Asian longhorned beetle (Anoplophora glabripennis), a globally significant invasive species, reveals key functional and evolutionary innovations at the beetle–plant interface Open
Amplification and functional divergence of genes associated with specialized feeding on plants, including genes originally obtained via horizontal gene transfer from fungi and bacteria, contributed to the addition, expansion, and enhanceme…
View article: Optimizing Fluctuating Thermal Regime Storage of Developing<i>Megachile rotundata</i>(Hymenoptera: Megachilidae)
Optimizing Fluctuating Thermal Regime Storage of Developing<i>Megachile rotundata</i>(Hymenoptera: Megachilidae) Open
The alfalfa leafcutting bee, Megachile rotundata (F.), is the primary pollinator for alfalfa seed production in North America. Under current management practice, developing pupae are incubated at 29-30°C until the adults emerge for pollina…