Tobin J. Hammer

ORCID: 0000-0002-7308-8440
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About
Contact & Profiles
Research Areas
  • Insect symbiosis and bacterial influences
  • Plant and animal studies
  • Insect and Pesticide Research
  • Insect and Arachnid Ecology and Behavior
  • Insect Utilization and Effects
  • Insect behavior and control techniques
  • Species Distribution and Climate Change
  • Entomopathogenic Microorganisms in Pest Control
  • Forest Ecology and Biodiversity Studies
  • Mosquito-borne diseases and control
  • Pediatric health and respiratory diseases
  • Microbial Community Ecology and Physiology
  • Gut microbiota and health
  • Insect-Plant Interactions and Control
  • Molecular Biology Techniques and Applications
  • Bee Products Chemical Analysis
  • Plant Parasitism and Resistance
  • Pharmaceutical and Antibiotic Environmental Impacts
  • Forensic Entomology and Diptera Studies
  • Genomics and Phylogenetic Studies
  • Respiratory viral infections research
  • Plant and fungal interactions
  • Asthma and respiratory diseases
  • Advanced biosensing and bioanalysis techniques
  • RNA modifications and cancer

University of California, Irvine
2022-2025

The University of Texas at Austin
2019-2023

University of Colorado Boulder
2014-2019

Cooperative Institute for Research in Environmental Sciences
2014-2017

University of Pannonia
2016

Smithsonian Tropical Research Institute
2014-2015

Columbia University
2015

Museum of Boulder
2015

Iowa Academy of Science
2014

University of California, San Diego
2009

Many animals are inhabited by microbial symbionts that influence their hosts' development, physiology, ecological interactions, and evolutionary diversification. However, firm evidence for the existence functional importance of resident microbiomes in larval Lepidoptera (caterpillars) is lacking, despite fact these insects enormously diverse, major agricultural pests, dominant herbivores many ecosystems. Using 16S rRNA gene sequencing quantitative PCR, we characterized gut wild leaf-feeding...

10.1073/pnas.1707186114 article EN Proceedings of the National Academy of Sciences 2017-08-22

Animals are distinguished by having guts—organs that must extract nutrients from food yet also bar invasion pathogens. Most guts colonized nonpathogenic microorganisms, but the functions of these microbes, or even reasons why they occur in gut, vary widely among animals. Sometimes microorganisms have codiversified with hosts; sometimes live mostly elsewhere environment. Either way, gut often benefit hosts. Benefits may reflect evolutionary addiction, whereby hosts incorporate into normal...

10.1146/annurev-ecolsys-110617-062453 article EN Annual Review of Ecology Evolution and Systematics 2019-08-29

Butterflies are charismatic insects that have long been a focus of biological research. They also habitats for microorganisms, yet these microbial symbionts little-studied, despite their likely importance to butterfly ecology and evolution. In particular, the diversity composition communities inhabiting adult butterflies remain uncharacterized, it is unknown how larval (caterpillar) microbiota compare. To address knowledge gaps, we used Illumina sequencing 16S rRNA genes from internal...

10.1371/journal.pone.0086995 article EN cc-by PLoS ONE 2014-01-23

Research on insect microbiota has greatly expanded over the past decade, along with a growing appreciation of microbial contributions to ecology and evolution. Many these studies use DNA sequencing characterize diversity composition insect-associated communities. The choice strategies used for specimen collection, storage, handling could introduce biases in molecular assessments microbiota, but such potential influences have not been systematically evaluated. Likewise, although it is common...

10.7717/peerj.1190 article EN cc-by PeerJ 2015-08-18

Much of the morbidity and mortality associated with influenza virus respiratory infection is due to bacterial coinfection pathogens that colonize upper tract such as methicillin-resistant Staphylococcus aureus (MRSA) Streptococcus pneumoniae. A major component immune response production type I III interferons. Here we show causes an increase restructuring microbiota in wild-type (WT) mice but not Il28r(-/-) mutant lacking receptor for interferon. Mice IL-28 fail induce STAT1 phosphorylation...

10.1128/mbio.01939-15 article EN cc-by-nc-sa mBio 2016-02-10

Antibiotics are routinely used to improve livestock health and growth. However, this practice may have unintended environmental impacts mediated by interactions among the wide range of micro- macroorganisms found in agroecosystems. For example, antibiotics alter microbial emissions greenhouse gases affecting gut microbiota. Furthermore, affect microbiota non-target animals that rely on dung, such as dung beetles, ecosystem services they provide. To examine these interactions, we treated...

10.1098/rspb.2016.0150 article EN Proceedings of the Royal Society B Biological Sciences 2016-05-25

Abstract The relationship between animals and their gut flora is simultaneously one of the most common complex symbioses on Earth. Despite its ubiquity, our understanding this invisible but often critical still in infancy. We employed adult Neotropical butterflies as a study system to ask three questions: First, how does microbial community composition vary across host individuals, species dietary guilds? Second, do microbiota compare food communities? Finally, are functionally adapted...

10.1002/ecm.1346 article EN cc-by-nc Ecological Monographs 2018-12-11

Abstract How a host's microbiome changes over its lifespan can influence development and ageing. As these temporal patterns have only been described in detail for handful of hosts, an important next step is to compare succession more broadly investigate why it varies. Here we characterize the dynamics stability bumble bee worker gut microbiome. Bumble bees simple host‐specific microbiomes, their microbial may health pollination services. We used 16S rRNA gene sequencing, quantitative PCR...

10.1111/mec.16769 article EN Molecular Ecology 2022-11-05

Responses to climate change are particularly complicated in species that engage symbioses, as the niche of one partner may be modified by other. We explored thermal traits gut symbionts honeybees and bumblebees, which vulnerable rising temperatures. In vitro assays symbiont strains isolated from 16 host revealed variation niches. Strains bumblebees tended less heat-tolerant than those honeybees, possibly due maintaining cooler nests or inhabiting climates. Overall, however, bee grew at...

10.1098/rspb.2020.1480 article EN Proceedings of the Royal Society B Biological Sciences 2021-02-10

Social bees are an important model for the ecology and evolution of gut microbiomes. These harbor ancient, specific, beneficial microbiomes crucial pollinators. However, most research has concentrated on managed honeybees bumblebees in temperate zone. Here we used 16S rRNA gene sequencing to characterize wild neotropical bumblebee communities from Colombia. We also analyzed drivers microbiome structure across our data previously published bumblebees. Our results show that lineages not only...

10.1128/msphere.00139-23 article EN cc-by mSphere 2023-10-19

Microbes shape the health of bumblebees, an important group pollinators, including species conservation concern. Most microbial research on bumblebees has focused eukaryotic and viral pathogens or core gut microbiome, a community host-specialized bacterial symbionts that helps protect hosts against pathogens. Bumblebees also harbour third class microbes: non-core bacteria, which are non-host specific vary among individuals. Understanding their functional role how they interact with is for...

10.1111/1365-2656.70029 article EN cc-by Journal of Animal Ecology 2025-04-03

Many insects host microbiomes with important ecological functions. However, the prevalence of this phenomenon is unclear because in many insect taxa, have been studied only part life cycle, if at all. A prominent example butterflies and moths, which composition functional role adult-stage are largely unknown. We comprehensively characterized adult passion-vine butterflies. Butterfly-associated bacterial communities generally abundant guts, consistent within populations, composed taxa widely...

10.1128/aem.02007-20 article EN Applied and Environmental Microbiology 2020-09-29

Pathogens and parasites of solitary bees have been studied for decades, but the microbiome as a whole is poorly understood most taxa. Comparative analyses features such composition, abundance, specificity, can shed light on bee ecology evolution host–microbe interactions. Here we study microbiomes ground-nesting cellophane (Colletidae: Diphaglossinae). From microbial point view, diphaglossine genus Ptiloglossa particularly remarkable: their larval provisions are liquid smell consistently...

10.3389/fmicb.2023.1114849 article EN cc-by Frontiers in Microbiology 2023-04-05

Abstract Many animals are inhabited by microbial symbionts that influence their hosts’ development, physiology, ecological interactions, and evolutionary diversification. However, firm evidence for the existence functional importance of resident microbiomes in larval Lepidoptera (caterpillars) is lacking, despite fact these insects enormously diverse, major agricultural pests, dominant herbivores many ecosystems. Using 16S rRNA gene sequencing quantitative PCR, we characterized gut wild...

10.1101/132522 preprint EN bioRxiv (Cold Spring Harbor Laboratory) 2017-04-30

Honeybee foragers are exposed to thermal stimuli when collecting food outside and receiving rewards inside the nest. In both contexts, there is an opportunity for associate warmth with rewards. However, honeybee learning poorly understood. Using associative paradigm (the proboscis extension reflex), we show that honeybees can learn a nectar reward heated stimulus applied antenna mimic natural contact warm flower or nectar-offering forager. Conditioning longer inter-trial intervals (ITI)...

10.1242/jeb.034140 article EN Journal of Experimental Biology 2009-11-13

Our planet is changing rapidly, and responding to the ensuing environmental challenges will require an informed citizenry that can understand inherent complexity of ecological systems. However, microorganisms are usually neglected in narratives we use nature. Here, advocate for inclusion microbial ecology across education levels delineate often benefits incorporating microbes into curricula. We provide examples levels, from secondary school (by considering one’s self as a ecosystem), higher...

10.1128/jmbe.v17i1.984 article EN cc-by-nc-nd Journal of Microbiology and Biology Education 2016-03-01
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