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Kim S, Kim JH, Cho S, Lee DE, Clark JM, Lee SH. Chronic exposure to field-realistic doses of imidacloprid resulted in biphasic negative effects on honey bee physiology. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2022; 144:103759. [PMID: 35341906 DOI: 10.1016/j.ibmb.2022.103759] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 03/17/2022] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
There have been many investigations on the negative effects of imidacloprid (IMD) on honey bees. IMD is known to disrupt honey bee physiology and colony health at a relatively low concentration compared to other pesticides. In this study, honey bee colonies were chronically exposed to field-realistic concentrations (5, 20, and 100 ppb) of IMD, and the body weight, flight performance, carbohydrate reserve, and lipid contents of forager bees analyzed. Transcriptome analyses followed by quantitative PCR were also conducted for both nurse and forager bees to elucidate any changes in energy metabolism related to phenotypic disorders. The body weights of newly emerged and nurse bees showed decreasing tendencies as the IMD concentration increased. In forager bees, however, IMD induced a biphasic change in body weight: body weight was decreased at the lower concentrations (5 and 20 ppb) but increased at the higher concentration (100 ppb). Nevertheless, the flight capability of forager bees significantly decreased in a concentration-dependent manner. The effects of IMD on target gene transcription in forager bees showed biphasic patterns between low (5 and 20 ppb) and high (100 ppb) concentrations. Nurse bees showed typical features of premature transition to foragers in a concentration-dependent manner. When exposed to low concentrations, forager bees exhibited downregulation of genes involved in carbohydrate and lipid metabolism and in the insulin/insulin-like growth factor signaling pathway, upregulation of transporter activity, and a dose-dependent body weight reduction, which were similar to insulin resistance and diabetic symptoms. However, increased lipid metabolism and decreased energy metabolism with body weight gain were observed at high IMD concentration. Considered together, these results suggest that field-realistic doses of IMD alter honey bee energy metabolism in distinctly different ways at low and high concentrations, both of which negatively affect honey bee colony health.
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Affiliation(s)
- Sanghyeon Kim
- Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
| | - Ju Hyeon Kim
- Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
| | - Susie Cho
- Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University, Seoul, South Korea
| | - Do Eun Lee
- Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University, Seoul, South Korea
| | - John Marshall Clark
- Department of Veterinary and Animal Sciences, University of Massachusetts Amherst, Amherst, United States
| | - Si Hyeock Lee
- Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, South Korea; Department of Agricultural Biotechnology, College of Agriculture and Life Science, Seoul National University, Seoul, South Korea.
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Estévez Dimitrov R, Amendt J, Rothweiler F, Zehner R. Age determination of the adult blow fly Lucilia sericata (Diptera: Calliphoridae) through quantitative pteridine fluorescence analysis. Forensic Sci Med Pathol 2020; 16:641-648. [PMID: 32915388 PMCID: PMC7669773 DOI: 10.1007/s12024-020-00295-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/28/2020] [Indexed: 02/02/2023]
Abstract
Determination of a minimal postmortem interval via age estimation of necrophagous diptera has been restricted to the juvenile stages and the time until emergence of the adult fly, i.e. up until 2-6 weeks depending on species and temperature. Age estimation of adult flies could extend this period by adding the age of the fly to the time needed for complete development. In this context pteridines are promising metabolites, as they accumulate in the eyes of flies with increasing age. We studied adults of the blow fly Lucilia sericata at constant temperatures of 16 °C and 25 °C up to an age of 25 days and estimated their pteridine levels by fluorescence spectroscopy. Age was given in accumulated degree days (ADD) across temperatures. Additionally, a mock case was set up to test the applicability of the method. Pteridine increases logarithmically with increasing ADD, but after 70-80 ADD the increase slows down and the curve approaches a maximum. Sex had a significant impact (p < 4.09 × 10-6) on pteridine fluorescence level, while body-size and head-width did not. The mock case demonstrated that a slight overestimation of the real age (in ADD) only occurred in two out of 30 samples. Age determination of L. sericata on the basis of pteridine levels seems to be limited to an age of about 70 ADD, but depending on the ambient temperature this could cover an extra amount of time of about 5-7 days after completion of the metamorphosis.
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Affiliation(s)
- Ronja Estévez Dimitrov
- Institute of Legal Medicine, University Hospital Frankfurt, Goethe-University, Kennedyallee 104, 60596, Frankfurt am Main, Germany.
| | - Jens Amendt
- Institute of Legal Medicine, University Hospital Frankfurt, Goethe-University, Kennedyallee 104, 60596, Frankfurt am Main, Germany
| | - Florian Rothweiler
- Institute of Medical Virology, University Hospital Frankfurt, Goethe-University, Paul-Ehrlich-Str.40, Frankfurt am Main, 60596, Germany
| | - Richard Zehner
- Institute of Legal Medicine, University Hospital Frankfurt, Goethe-University, Kennedyallee 104, 60596, Frankfurt am Main, Germany
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Abstract
Invertebrates are becoming more popular and, as collections age, clients may seek veterinary intervention where the welfare of the animal must be considered. This article covers aging in many invertebrate species but with a focus on species likely to be seen in general practice. Supportive care may be an option to prolong life, but euthanasia must be considered for invertebrates with age-related unmanageable conditions.
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Affiliation(s)
- Sarah Pellett
- Animates Veterinary Clinic, 2 The Green, Thurlby, Lincolnshire PE10 0EB, UK.
| | - Michelle O'Brien
- Wildfowl & Wetlands Trust, Newgrounds Lane, Slimbridge, Gloucestershire GL2 7BT, UK
| | - Benjamin Kennedy
- Anton Vets, Anton Trading Estate, Anton Mill Road, Andover SP10 2NJ, UK
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Hartmann C, Heinze J, Bernadou A. Age-dependent changes in cuticular color and pteridine levels in a clonal ant. JOURNAL OF INSECT PHYSIOLOGY 2019; 118:103943. [PMID: 31518554 DOI: 10.1016/j.jinsphys.2019.103943] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 09/09/2019] [Accepted: 09/10/2019] [Indexed: 06/10/2023]
Abstract
Social insects are emerging models for studying aging and the longevity/fecundity trade-off. Research on the demography of colonies and populations are hampered by the lack of reliable age markers. Here we investigate the suitability of cuticular pigmentation and pteridine fluorescence for age grading individuals of the clonal ant Platythyrea punctata. We found that both traits varied with age. Cuticular color darkened with individual's age until 25-30 days after hatching. For pteridine fluorescence, we found that P. punctata workers show a decrease in head pteridine levels over time until 70-80 days of age. Together with other markers, such as age-based behavior, cuticular coloration and pteridine fluorescence may help to estimate the age structure of colonies.
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Affiliation(s)
- Clara Hartmann
- Zoology / Evolutionary Biology, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany.
| | - Jürgen Heinze
- Zoology / Evolutionary Biology, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany
| | - Abel Bernadou
- Zoology / Evolutionary Biology, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany
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Measuring biological age to assess colony demographics in honeybees. PLoS One 2018; 13:e0209192. [PMID: 30543711 PMCID: PMC6292630 DOI: 10.1371/journal.pone.0209192] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 11/30/2018] [Indexed: 01/10/2023] Open
Abstract
Honeybee colonies are increasingly exposed to environmental stress factors, which can lead to their decline or failure. However, there are major gaps in stressor risk assessment due to the difficulty of assessing the honeybee colony state and detecting abnormal events. Since stress factors usually induce a demographic disturbance in the colony (e.g. loss of foragers, early transition from nurse to forager state), we suggest that disturbances could be revealed indirectly by measuring the age- and task-related physiological state of bees, which can be referred to as biological age (an indicator of the changes in physiological state that occur throughout an individual lifespan). We therefore estimated the biological age of bees from the relationship between age and biomarkers of task specialization (vitellogenin and the adipokinetic hormone receptor). This relationship was determined from a calibrated sample set of known-age bees and mathematically modelled for biological age prediction. Then, we determined throughout the foraging season the evolution of the biological age of bees from colonies with low (conventional apiary) or high Varroa destructor infestation rates (organic apiary). We found that the biological age of bees from the conventional apiary progressively decreased from the spring (17 days) to the fall (6 days). However, in colonies from the organic apiary, the population aged from spring (13 days) to summer (18.5 days) and then rejuvenated in the fall (13 days) after Varroa treatment. Biological age was positively correlated with the amount of brood (open and closed cells) in the apiary with low Varroa pressure, and negatively correlated with Varroa infestation level in the apiary with high Varroa pressure. Altogether, these results show that the estimation of biological age is a useful and effective method for assessing colony demographic state and likely detrimental effects of stress factors.
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Edalat H, Akhoundi M, Basseri H. Age-dependance of pteridines in the malaria vector, Anopheles stephensi. Pteridines 2017. [DOI: 10.1515/pterid-2017-0009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Determining the accurate age of malaria vectors is crucial to measure the risk of malaria transmission. A group of fluorescent chemicals derived from a pyrimidine-pyrazine ring structure known as pteridines from the head, thorax and whole body of adult female Anopheles stephensi were identified and evaluated as a tool for chronological and physiological age determination of malaria vectors. The female mosquitoes were collected from an insectary colony at an interval of every 5 days, up to 30 days, and the pteridines of head, thorax and whole body were detected fluorometrically by high-pressure liquid chromatography (HPLC) using excitation and emission wavelengths of 365 and 455 nm, respectively. In addition, alteration of the pteridines compounds was compared between blood and sugar fed mosquito groups. Although four pteridines including pterin-6-carboxylic acid, biopterin, xanthopterin and isoxanthopterin were detected, some of them were absent in the head or thorax of mosquitoes. Levels of all four pteridines were similarly decreased in a linear manner throughout 30 days. No significant difference in alteration of pteridine compounds was observed between the two groups of blood or sugar fed mosquitoes. This result indicates that diet has a little effect on pteridines alteration. Age determination based on pteridines, as an age-grading technique, could be used for field collected mosquitoes, which have either sugar or blood meal. In addition, analyzing total pteridine fluorescence from only whole body could be a convenient method to estimate the age.
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Affiliation(s)
- Hamideh Edalat
- Department of Medical Entomology and Vector Control , School of Public Health, Tehran University of Medical Sciences , Tehran , Iran
| | - Mohammad Akhoundi
- Department of Medical Entomology and Vector Control , School of Public Health, Tehran University of Medical Sciences , Tehran , Iran
| | - Hamidreza Basseri
- Department of Medical Entomology and Vector Control , School of Public Health, Tehran University of Medical Sciences , Tehran , Iran
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Vilela DS, Tosta TA, Rodrigues RR, Del-Claro K, Guillermo-Ferreira R. Colours of war: visual signals may influence the outcome of territorial contests in the tiger damselfly, Tigriagrion aurantinigrum. Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx024] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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