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Bezerra de Melo N, Sobreira Duarte LN, Maia Vieira Pereira C, da Silva Barbosa J, Matos Gonçalves da Silva A, de Souza Coelho Soares R, Meira Bento P. Thermographic examination of gingival phenotypes: correlation between morphological and thermal parameters. Clin Oral Investig 2023; 27:7705-7714. [PMID: 37924357 DOI: 10.1007/s00784-023-05361-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 10/22/2023] [Indexed: 11/06/2023]
Abstract
OBJECTIVES To evaluate the clinical and thermographic aspects of the gingival phenotype (GP) in healthy subjects. MATERIALS AND METHODS The study sample examined 264 teeth, upper and lower incisors, comprising 132 central incisors (CI) and 132 lateral incisors (LI), in 33 healthy volunteers. Four periodontal parameters were recorded systematically: ratio of width to length of the dental crown (CW/CL), height of the gingival attachment (KGW), probing depth (PD), and gingival transparency (GT). The temperatures of the attached gingiva (KGW temp) and the free gingival margin (FGM Temp) were also recorded by way of infrared thermography (IRT). RESULTS The average age of the sample was 30.70 ± 7.65 years. Of the 264 teeth evaluated, 76.1% had a thin GP. There was a significant association between CW/CL (p < 0.001), KGW (p < 0.001), PD (p < 0.007), and FGM Temp (p < 0.006) with the tooth groups. The results show a significant and inversely proportional correlation between clinical parameters and gingival temperature (p < 0.05). A significant association was found between CW/CL (p < 0.026); KGW (p < 0.001); and GP. CONCLUSION CW/CL, KGW, PD, and FGM Temp vary according to tooth group. The majority of the sample presented with the thin GP, which was more prevalent in the lower LIs and CIs. No significant association could be observed between thermographic parameters and GP. CLINICAL RELEVANCE Knowledge of the temperature of the gingival tissues can be useful in helping to diagnose and plan periodontal treatments. Moreover, our findings will help future studies evaluate the use of IR as an auxiliary diagnostic method in dentistry, eliminating GP as a confounding factor, since it does not seem to influence the temperature of the gingival tissues.
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Affiliation(s)
- Niebla Bezerra de Melo
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil.
| | - Lígia Natália Sobreira Duarte
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil
| | - Camila Maia Vieira Pereira
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil
| | - Jussara da Silva Barbosa
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil
| | - Ariane Matos Gonçalves da Silva
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil
| | - Renata de Souza Coelho Soares
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil
| | - Patrícia Meira Bento
- Department of Dentistry, State University of Paraíba, R. Baraúnas, 351, Universitário, Campina Grande, PB, 58429-500, Brazil
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2
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Chowaniec K, Latkowska E, Skubała K. Effect of thallus melanisation on the sensitivity of lichens to heat stress. Sci Rep 2023; 13:5083. [PMID: 36977766 PMCID: PMC10049980 DOI: 10.1038/s41598-023-32215-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 03/24/2023] [Indexed: 03/30/2023] Open
Abstract
Extreme climatic phenomena such as heat waves, heavy rainfall and prolonged droughts are one of the main problems associated with ongoing climate change. The global increase in extreme rainfalls associated with summer heatwaves are projected to increase in amplitude and frequency in the near future. However, the consequences of such extreme events on lichens are largely unknown. The aim was to determine the effect of heat stress on the physiology of lichen Cetraria aculeata in a metabolically active state and to verify whether strongly melanised thalli are more resistant than poorly melanised thalli. In the present study, melanin was extracted from C. aculeata for the first time. Our study showed that the critical temperature for metabolism is around 35 °C. Both symbiotic partners responded to heat stress, manifested by the decreased maximum quantum yield of PSII photochemistry, high level of cell membrane damage, increased membrane lipid peroxidation and decreased dehydrogenase activity. Highly melanised thalli were more sensitive to heat stress, which excludes the role of melanins as compounds protecting against heat stress. Therefore, mycobiont melanisation imposes a trade-off between protection against UV and avoidance of damage caused by high temperature. It can be concluded that heavy rainfall during high temperatures may significantly deteriorate the physiological condition of melanised thalli. However, the level of membrane lipid peroxidation in melanised thalli decreased over time after exposure, suggesting greater efficiency of antioxidant defence mechanisms. Given the ongoing climate changes, many lichen species may require a great deal of plasticity to maintain their physiological state at a level that ensures their survival.
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Affiliation(s)
- Karolina Chowaniec
- Institute of Botany, Faculty of Biology, Jagiellonian University, Gronostajowa 3, 30-387, Kraków, Poland
- Doctoral School of Exact and Natural Sciences, Jagiellonian University in Kraków, Prof. S. Łojasiewicza 11, 30-348, Kraków, Poland
| | - Ewa Latkowska
- Laboratory of Metabolomics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
| | - Kaja Skubała
- Institute of Botany, Faculty of Biology, Jagiellonian University, Gronostajowa 3, 30-387, Kraków, Poland.
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3
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Siami M, Barszcz T, Wodecki J, Zimroz R. Automated Identification of Overheated Belt Conveyor Idlers in Thermal Images with Complex Backgrounds Using Binary Classification with CNN. SENSORS (BASEL, SWITZERLAND) 2022; 22:10004. [PMID: 36560373 PMCID: PMC9785391 DOI: 10.3390/s222410004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/02/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Mechanical industrial infrastructures in mining sites must be monitored regularly. Conveyor systems are mechanical systems that are commonly used for safe and efficient transportation of bulk goods in mines. Regular inspection of conveyor systems is a challenging task for mining enterprises, as conveyor systems' lengths can reach tens of kilometers, where several thousand idlers need to be monitored. Considering the harsh environmental conditions that can affect human health, manual inspection of conveyor systems can be extremely difficult. Hence, the authors proposed an automatic robotics-based inspection for condition monitoring of belt conveyor idlers using infrared images, instead of vibrations and acoustic signals that are commonly used for condition monitoring applications. The first step in the whole process is to segment the overheated idlers from the complex background. However, classical image segmentation techniques do not always deliver accurate results in the detection of target in infrared images with complex backgrounds. For improving the quality of captured infrared images, preprocessing stages are introduced. Afterward, an anomaly detection method based on an outlier detection technique is applied to the preprocessed image for the segmentation of hotspots. Due to the presence of different thermal sources in mining sites that can be captured and wrongly identified as overheated idlers, in this research, we address the overheated idler detection process as an image binary classification task. For this reason, a Convolutional Neural Network (CNN) was used for the binary classification of the segmented thermal images. The accuracy of the proposed condition monitoring technique was compared with our previous research. The metrics for the previous methodology reach a precision of 0.4590 and an F1 score of 0.6292. The metrics for the proposed method reach a precision of 0.9740 and an F1 score of 0.9782. The proposed classification method considerably improved our previous results in terms of the true identification of overheated idlers in the presence of complex backgrounds.
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Affiliation(s)
| | - Tomasz Barszcz
- Department of Robotics and Mechatronics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
| | - Jacek Wodecki
- Department of Mining, Faculty of Geoengineering, Mining and Geology, Wrocław University of Science and Technology, 50-370 Wroclaw, Poland
| | - Radoslaw Zimroz
- Department of Mining, Faculty of Geoengineering, Mining and Geology, Wrocław University of Science and Technology, 50-370 Wroclaw, Poland
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4
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Soravia C, Ashton BJ, Ridley AR. Periorbital temperature responses to natural air temperature variation in wild birds. J Therm Biol 2022; 109:103323. [DOI: 10.1016/j.jtherbio.2022.103323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 08/10/2022] [Accepted: 08/30/2022] [Indexed: 10/14/2022]
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5
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Pereyra Irujo G. IRimage: open source software for processing images from infrared thermal cameras. PeerJ Comput Sci 2022; 8:e977. [PMID: 35634096 PMCID: PMC9138121 DOI: 10.7717/peerj-cs.977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 04/19/2022] [Indexed: 06/15/2023]
Abstract
IRimage aims at increasing throughput, accuracy and reproducibility of results obtained from thermal images, especially those produced with affordable, consumer-oriented cameras. IRimage processes thermal images, extracting raw data and calculating temperature values with an open and fully documented algorithm, making this data available for further processing using image analysis software. It also allows the making of reproducible measurements of the temperature of objects in a series of images, and produce visual outputs (images and videos) suitable for scientific reporting. IRimage is implemented in a scripting language of the scientific image analysis software ImageJ, allowing its use through a graphical user interface and also allowing for an easy modification or expansion of its functionality. IRimage's results were consistent with those of standard software for 15 camera models of the most widely used brand. An example use case is also presented, in which IRimage was used to efficiently process hundreds of thermal images to reveal subtle differences in the daily pattern of leaf temperature of plants subjected to different soil water contents. IRimage's functionalities make it better suited for research purposes than many currently available alternatives, and could contribute to making affordable consumer-grade thermal cameras useful for reproducible research.
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Affiliation(s)
- Gustavo Pereyra Irujo
- Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Balcarce, Buenos Aires, Argentina
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6
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Harrap MJM, Rands SA. The role of petal transpiration in floral humidity generation. PLANTA 2022; 255:78. [PMID: 35246754 PMCID: PMC8897325 DOI: 10.1007/s00425-022-03864-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 02/22/2022] [Indexed: 05/11/2023]
Abstract
Using petrolatum gel as an antitranspirant on the flowers of California poppy and giant bindweed, we show that transpiration provides a large contribution to floral humidity generation. Floral humidity, an area of elevated humidity in the headspace of flowers, is believed to be produced predominantly through a combination of evaporation of liquid nectar and transpirational water loss from the flower. However, the role of transpiration in floral humidity generation has not been directly tested and is largely inferred by continued humidity production when nectar is removed from flowers. We test whether transpiration contributes to the floral humidity generation of two species previously identified to produce elevated floral humidity, Calystegia silvatica and Eschscholzia californica. Floral humidity production of flowers that underwent an antitranspirant treatment, petrolatum gel which blocks transpiration from treated tissues, is compared to flowers that did not receive such treatments. Gel treatments reduced floral humidity production to approximately a third of that produced by untreated flowers in C. silvatica, and half of that in E. californica. This confirms the previously untested inferences that transpiration has a large contribution to floral humidity generation and that this contribution may vary between species.
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Affiliation(s)
- Michael J M Harrap
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK.
- The John Krebs Field Station, University of Oxford, Wytham, Oxford, OX2 8QJ, UK.
| | - Sean A Rands
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK.
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7
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Knoch S, Whiteside MA, Madden JR, Rose PE, Fawcett TW. Hot-headed peckers: thermographic changes during aggression among juvenile pheasants ( Phasianus colchicus). Philos Trans R Soc Lond B Biol Sci 2022; 377:20200442. [PMID: 35000453 PMCID: PMC8743885 DOI: 10.1098/rstb.2020.0442] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/28/2021] [Indexed: 12/16/2022] Open
Abstract
In group-living vertebrates, dominance status often covaries with physiological measurements (e.g. glucocorticoid levels), but it is unclear how dominance is linked to dynamic changes in physiological state over a shorter, behavioural timescale. In this observational study, we recorded spontaneous aggression among captive juvenile pheasants (Phasianus colchicus) alongside infrared thermographic measurements of their external temperature, a non-invasive technique previously used to examine stress responses in non-social contexts, where peripheral blood is redirected towards the body core. We found low but highly significant repeatability in maximum head temperature, suggesting individually consistent thermal profiles, and some indication of lower head temperatures in more active behavioural states (e.g. walking compared to resting). These individual differences were partly associated with sex, females being cooler on average than males, but unrelated to body size. During pairwise aggressive encounters, we observed a non-monotonic temperature change, with head temperature dropping rapidly immediately prior to an attack and increasing rapidly afterwards, before returning to baseline levels. This nonlinear pattern was similar for birds in aggressor and recipient roles, but aggressors were slightly hotter on average. Our findings show that aggressive interactions induce rapid temperature changes in dominants and subordinates alike, and highlight infrared thermography as a promising tool for investigating the physiological basis of pecking orders in galliforms. This article is part of the theme issue 'The centennial of the pecking order: current state and future prospects for the study of dominance hierarchies'.
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Affiliation(s)
- Sophia Knoch
- Centre for Research in Animal Behaviour (CRAB), Washington Singer Laboratories, University of Exeter, Exeter EX4 4QG, UK
- Institute of Psychology, University of Freiburg, Engelbergerstr. 41, 79085 Freiburg, Germany
| | - Mark A. Whiteside
- Centre for Research in Animal Behaviour (CRAB), Washington Singer Laboratories, University of Exeter, Exeter EX4 4QG, UK
- School of Biological and Marine Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
| | - Joah R. Madden
- Centre for Research in Animal Behaviour (CRAB), Washington Singer Laboratories, University of Exeter, Exeter EX4 4QG, UK
| | - Paul E. Rose
- Centre for Research in Animal Behaviour (CRAB), Washington Singer Laboratories, University of Exeter, Exeter EX4 4QG, UK
| | - Tim W. Fawcett
- Centre for Research in Animal Behaviour (CRAB), Washington Singer Laboratories, University of Exeter, Exeter EX4 4QG, UK
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8
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Thermal imaging reveals audience-dependent effects during cooperation and competition in wild chimpanzees. Sci Rep 2022; 12:2972. [PMID: 35194084 PMCID: PMC8863809 DOI: 10.1038/s41598-022-07003-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 02/09/2022] [Indexed: 12/28/2022] Open
Abstract
Accessing animal minds has remained a challenge since the beginnings of modern science. Here, we used a little-tried method, functional infrared thermal imaging, with wild chimpanzees during common social interactions. After removing confounds, we found that chimpanzees involved in competitive events had lower nose skin temperatures whereas those involved in cooperative events had higher temperatures, the latter more so in high- than low-ranking males. Temperatures associated with grooming were akin to those of cooperative events, except when males interacted with a non-reciprocating alpha male. In addition, we found multiple audience effects. Notably, the alpha male's presence reduced positive effects associated with cooperation, whereas female presence buffered negative effects associated with competition. Copulation was perceived as competitive, especially during furtive mating when other males were absent. Overall, patterns suggest that chimpanzees categorise ordinary social events as cooperative or competitive and that these perceptions are moderated by specific audiences.
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9
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Zheng S, Zhou C, Jiang X, Huang J, Xu D. Progress on Infrared Imaging Technology in Animal Production: A Review. SENSORS 2022; 22:s22030705. [PMID: 35161450 PMCID: PMC8839879 DOI: 10.3390/s22030705] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 12/28/2021] [Accepted: 01/13/2022] [Indexed: 02/01/2023]
Abstract
Infrared thermography (IRT) imaging technology, as a convenient, efficient, and contactless temperature measurement technology, has been widely applied to animal production. In this review, we systematically summarized the principles and influencing parameters of IRT imaging technology. In addition, we also summed up recent advances of IRT imaging technology in monitoring the temperature of animal surfaces and core anatomical areas, diagnosing early disease and inflammation, monitoring animal stress levels, identifying estrus and ovulation, and diagnosing pregnancy and animal welfare. Finally, we made prospective forecast for future research directions, offering more theoretical references for related research in this field.
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Affiliation(s)
- Shuailong Zheng
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan 430070, China; (S.Z.); (C.Z.)
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China;
- Colleges of Animal Science & Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Changfan Zhou
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan 430070, China; (S.Z.); (C.Z.)
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China;
- Colleges of Animal Science & Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Xunping Jiang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China;
- Colleges of Animal Science & Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Jingshu Huang
- Agricultural Development Center of Hubei Province, Wuhan 430064, China;
| | - Dequan Xu
- Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan 430070, China; (S.Z.); (C.Z.)
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China;
- Colleges of Animal Science & Technology, Huazhong Agricultural University, Wuhan 430070, China
- Correspondence:
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10
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Søberg S, Löfgren J, Philipsen FE, Jensen M, Hansen AE, Ahrens E, Nystrup KB, Nielsen RD, Sølling C, Wedell-Neergaard AS, Berntsen M, Loft A, Kjær A, Gerhart-Hines Z, Johannesen HH, Pedersen BK, Karstoft K, Scheele C. Altered brown fat thermoregulation and enhanced cold-induced thermogenesis in young, healthy, winter-swimming men. CELL REPORTS MEDICINE 2021; 2:100408. [PMID: 34755128 PMCID: PMC8561167 DOI: 10.1016/j.xcrm.2021.100408] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 07/13/2021] [Accepted: 09/17/2021] [Indexed: 12/18/2022]
Abstract
The Scandinavian winter-swimming culture combines brief dips in cold water with hot sauna sessions, with conceivable effects on body temperature. We study thermogenic brown adipose tissue (BAT) in experienced winter-swimming men performing this activity 2–3 times per week. Our data suggest a lower thermal comfort state in the winter swimmers compared with controls, with a lower core temperature and absence of BAT activity. In response to cold, we observe greater increases in cold-induced thermogenesis and supraclavicular skin temperature in the winter swimmers, whereas BAT glucose uptake and muscle activity increase similarly to those of the controls. All subjects demonstrate nocturnal reduction in supraclavicular skin temperature, whereas a distinct peak occurs at 4:30–5:30 a.m. in the winter swimmers. Our data leverage understanding of BAT in adult human thermoregulation, suggest both heat and cold acclimation in winter swimmers, and propose winter swimming as a potential strategy for increasing energy expenditure. Winter swimmers have a lower core temperature at a thermal comfort state than controls Winter swimmers had no BAT glucose uptake at a thermal comfort state Winter swimmers have higher cold-induced thermogenesis than control subjects Human supraclavicular skin temperature varies with a diurnal rhythm
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Affiliation(s)
- Susanna Søberg
- The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark.,Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Johan Löfgren
- Department of Clinical Physiology, Nuclear Medicine & PET, and Cluster for Molecular Imaging, Rigshospitalet and University of Copenhagen, Copenhagen 2100, Denmark
| | - Frederik E Philipsen
- Department of Clinical Physiology, Nuclear Medicine & PET, and Cluster for Molecular Imaging, Rigshospitalet and University of Copenhagen, Copenhagen 2100, Denmark
| | - Michal Jensen
- The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark
| | - Adam E Hansen
- Department of Clinical Physiology, Nuclear Medicine & PET, and Cluster for Molecular Imaging, Rigshospitalet and University of Copenhagen, Copenhagen 2100, Denmark
| | - Esben Ahrens
- Department of Neurophysiology, Rigshospitalet, Copenhagen 2100, Denmark
| | - Kristin B Nystrup
- Department of Neuroanaesthesiology, Rigshospitalet, Copenhagen 2100, Denmark
| | - Rune D Nielsen
- Department of Neuroanaesthesiology, Rigshospitalet, Copenhagen 2100, Denmark
| | - Christine Sølling
- Department of Neuroanaesthesiology, Rigshospitalet, Copenhagen 2100, Denmark
| | - Anne-Sophie Wedell-Neergaard
- The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark
| | - Marianne Berntsen
- Department of Neuroanaesthesiology, Rigshospitalet, Copenhagen 2100, Denmark
| | - Annika Loft
- Department of Clinical Physiology, Nuclear Medicine & PET, and Cluster for Molecular Imaging, Rigshospitalet and University of Copenhagen, Copenhagen 2100, Denmark
| | - Andreas Kjær
- Department of Clinical Physiology, Nuclear Medicine & PET, and Cluster for Molecular Imaging, Rigshospitalet and University of Copenhagen, Copenhagen 2100, Denmark
| | - Zachary Gerhart-Hines
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
| | - Helle H Johannesen
- Department of Clinical Physiology, Nuclear Medicine & PET, and Cluster for Molecular Imaging, Rigshospitalet and University of Copenhagen, Copenhagen 2100, Denmark
| | - Bente K Pedersen
- The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark
| | - Kristian Karstoft
- The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark.,Department of Clinical Pharmacology, Bispebjerg Hospital, Copenhagen 2400, Denmark
| | - Camilla Scheele
- The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark.,Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
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11
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Harrap MJM, Hempel de Ibarra N, Knowles HD, Whitney HM, Rands SA. Bumblebees can detect floral humidity. J Exp Biol 2021; 224:jeb240861. [PMID: 34161560 PMCID: PMC8246344 DOI: 10.1242/jeb.240861] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 05/10/2021] [Indexed: 11/20/2022]
Abstract
Floral humidity, a region of elevated humidity in the headspace of the flower, occurs in many plant species and may add to their multimodal floral displays. So far, the ability to detect and respond to floral humidity cues has been only established for hawkmoths when they locate and extract nectar while hovering in front of some moth-pollinated flowers. To test whether floral humidity can be used by other more widespread generalist pollinators, we designed artificial flowers that presented biologically relevant levels of humidity similar to those shown by flowering plants. Bumblebees showed a spontaneous preference for flowers that produced higher floral humidity. Furthermore, learning experiments showed that bumblebees are able to use differences in floral humidity to distinguish between rewarding and non-rewarding flowers. Our results indicate that bumblebees are sensitive to different levels of floral humidity. In this way floral humidity can add to the information provided by flowers and could impact pollinator behaviour more significantly than previously thought.
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Affiliation(s)
- Michael J. M. Harrap
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK
- Centre for Research in Animal Behaviour, School of Psychology, University of Exeter, Exeter, EX4 4QG, UK
| | - Natalie Hempel de Ibarra
- Centre for Research in Animal Behaviour, School of Psychology, University of Exeter, Exeter, EX4 4QG, UK
| | - Henry D. Knowles
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK
- Natural Resources Wales, Maes Newydd, Llandarcy, Neath Port Talbot, SA10 6JQ, UK
| | - Heather M. Whitney
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK
| | - Sean A. Rands
- School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK
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12
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Huang HD, Ravi V, Rhodes P, Du-Fay-de-Lavallaz JM, Winterfield J, Allen-Proctor M, Wasserlauf J, Krishnan K, Trohman R, Sharma PS, Larsen TR. Use of infrared thermography to delineate temperature gradients and critical isotherms during catheter ablation with normal and half normal saline: Implications for safety and efficacy. J Cardiovasc Electrophysiol 2021; 32:2035-2044. [PMID: 34061411 DOI: 10.1111/jce.15121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 05/17/2021] [Accepted: 05/25/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Radiofrequency (RF) ablation with half-normal saline (HNS) has shown promise as a bail-out strategy following failed ventricular tachycardia ablation using standard approaches. OBJECTIVE To use a novel infrared thermal imaging (ITI) model to evaluate biophysical and lesion characteristics during RF ablation using normal saline (NS) and HNS irrigation. METHODS Left ventricular strips of myocardium were excised from fresh porcine hearts. RF ablation was performed using an open-irrigated ablation catheter (Thermocool ST/SF) with NS (n = 75) and HNS (n = 75) irrigation using different power settings (40/50 W), RF durations (30/60 s), contact force of 10-15 g, and flow rate of 15 ml/min. RF lesions were recorded using an infrared thermal camera and border zone, lethal, 100° isotherms were matched with necrotic borders after 2% triphenyltetrazolium chloride staining. Lesion dimensions and isotherms (mm2 ) were measured. RESULTS In total, 150 lesions were delivered. HNS lesions were deeper (6.4 ± 1.1 vs. 5.7 ±0.8 mm; p = .03), and larger in volume (633 ± 153 vs. 468 ± 107 mm3 ; p = .007) than NS lesions. Steam pops (SPs) occurred during 19/75 lesions (25%) in the NS group and 32/75 lesions (43%) in the HNS group (p = .34). Lethal (57.8 ± 6.5 vs. 36.0 ± 3.9 mm2 ; p = .001) and 100°C isotherm areas (16.9 ± 6.9 vs. 3.8 ± 4.2 mm2 ; p = .003) areas were larger and were reached earlier in the HNS group. CONCLUSIONS RFA using HNS created larger lesions than NS irrigation but led to more frequent SPs. The presence of earlier lethal isotherms and temperature rises above 100°C on ITI suggest a potentially narrower therapeutic-safety window with HNS.
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Affiliation(s)
- Henry D Huang
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Venkatesh Ravi
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Paul Rhodes
- Biosense-Webster, Diamond Bar, California, USA
| | | | - Jeffrey Winterfield
- Divison of Cardiology, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Mary Allen-Proctor
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Jeremiah Wasserlauf
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Kousik Krishnan
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Richard Trohman
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Parikshit S Sharma
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
| | - Timothy R Larsen
- Division of Cardiology, Rush University Medical Center, Chicago, Illinois, USA
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Xu Z, Agbigbe O, Nigro N, Yakobi G, Shapiro J, Ginosar Y. Use of high-resolution thermography as a validation measure to confirm epidural anesthesia in mice: a cross-over study. Int J Obstet Anesth 2021; 46:102981. [PMID: 33906822 DOI: 10.1016/j.ijoa.2021.102981] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 02/17/2021] [Accepted: 03/14/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND Effective epidural anesthesia is confirmed in humans by sensory assessments but these tests are not feasible in mice. We hypothesized that, in mice, infrared thermography would demonstrate selective segmental warming of lower extremities following epidural anesthesia. METHODS We anesthetized 10 C57BL/6 mice with isoflurane and then inserted a PU-10 epidural catheter under direct surgical microscopy at T11-12. A thermal camera (thermal sensitivity ±0.05°C, pixel resolution 320x240 pixels, and spatial resolution 200 μm) recorded baseline temperature of front and rear paws, tail and ears. Thermography was assessed at baseline and 2, 5, 10, and 15 min after an epidural bolus dose of 50 μL bupivacaine 0.25% or 50 μL saline (control) using a cross-over design with dose order randomized and investigators blinded to study drug. Thermal images were recorded from video and analyzed using FLIR software. Effect over time and maximal effect (Emax) were assessed by repeated measures ANOVA and paired t-tests. Comparisons were between bupivacaine and control, and between lower vs upper extremities. RESULTS Epidural bupivacaine caused progressive warming of lower compared with upper extremities (P <0.001), typically returning to baseline by 15 min after administration. Mean (±SD) Emax was +3.73 (±1.56) °C for lower extremities compared with 0.56 (±0.68) °C (P=0.03) for upper extremities. Following epidural saline, there was no effect over time (Emax for lower extremities -0.88 (±0.28) °C compared with the upper extremities -0.88 (±0.19) °C (P >0.99). CONCLUSIONS Thermography is a useful tool to confirm epidural catheter placement in animals for which subjective, non-noxious, sensory measures are impossible.
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Affiliation(s)
- Z Xu
- Department of Anesthesiology, Washington University School of Medicine, St Louis, MO, USA
| | - O Agbigbe
- Washington University School of Medicine, St Louis, MO, USA
| | - N Nigro
- Washington University School of Medicine, St Louis, MO, USA
| | - G Yakobi
- Department of Anesthesiology, Critical Care and Pain Medicine, Hadassah Hebrew University Medical Center, and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - J Shapiro
- Department of Anesthesiology, Critical Care and Pain Medicine, Hadassah Hebrew University Medical Center, and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Y Ginosar
- Department of Anesthesiology, Washington University School of Medicine, St Louis, MO, USA; Department of Anesthesiology, Critical Care and Pain Medicine, Hadassah Hebrew University Medical Center, and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel; Wohl Institute of Translational Medicine, Hadassah Hebrew University Medical Center, and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.
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Harrap MJM, Rands SA. Floral infrared emissivity estimates using simple tools. PLANT METHODS 2021; 17:23. [PMID: 33632239 PMCID: PMC7905901 DOI: 10.1186/s13007-021-00721-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 02/09/2021] [Indexed: 05/25/2023]
Abstract
BACKGROUND Floral temperature has important consequences for plant biology, and accurate temperature measurements are therefore important to plant research. Thermography, also referred to as thermal imaging, is beginning to be used more frequently to measure and visualize floral temperature. Accurate thermographic measurements require information about the object's emissivity (its capacity to emit thermal radiation with temperature), to obtain accurate temperature readings. However, there are currently no published estimates of floral emissivity available. This is most likely to be due to flowers being unsuitable for the most common protocols for emissivity estimation. Instead, researchers have used emissivity estimates collected on vegetative plant tissue when conducting floral thermography, assuming these tissues to have the same emissivity. As floral tissue differs from vegetative tissue, it is unclear how appropriate and accurate these vegetative tissue emissivity estimates are when they are applied to floral tissue. RESULTS We collect floral emissivity estimates using two protocols, using a thermocouple and a water bath, providing a guide for making estimates of floral emissivity that can be carried out without needing specialist equipment (apart from the thermal camera). Both protocols involve measuring the thermal infrared radiation from flowers of a known temperature, providing the required information for emissivity estimation. Floral temperature is known within these protocols using either a thermocouple, or by heating the flowers within a water bath. Emissivity estimates indicate floral emissivity is high, near 1, at least across petals. While the two protocols generally indicated the same trends, the water bath protocol gave more realistic and less variable estimates. While some variation with flower species and location on the flower is observed in emissivity estimates, these are generally small or can be explained as resulting from artefacts of these protocols, relating to thermocouple or water surface contact quality. CONCLUSIONS Floral emissivity appears to be high, and seems quite consistent across most flowers and between species, at least across petals. A value near 1, for example 0.98, is recommended for accurate thermographic measurements of floral temperature. This suggests that the similarly high values based on vegetation emissivity estimates used by previous researchers were appropriate.
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Affiliation(s)
- Michael J M Harrap
- University of Bristol, Life Sciences Building, Tyndall Ave, Bristol, BS8 1TQ, UK.
| | - Sean A Rands
- University of Bristol, Life Sciences Building, Tyndall Ave, Bristol, BS8 1TQ, UK
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Rands SA, Harrap MJM. Phylogenetic signal in floral temperature patterns. BMC Res Notes 2021; 14:39. [PMID: 33509265 PMCID: PMC7844958 DOI: 10.1186/s13104-021-05455-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/16/2021] [Indexed: 02/01/2023] Open
Abstract
OBJECTIVES Floral structures may be warmer than their environment, and can show thermal patterning, where individual floral structures show different temperatures across their surface. Pollinators can differentiate between artificial flowers that mimic both naturally warmed and thermally patterned ones, but it has yet to be demonstrated that these patterns are biologically meaningful. To explore the relationship between pollinators and temperature patterning, we need to know whether there is diversity in patterning, and that these patterns are not simply a by-product of floral architecture constrained by ancestry. We analysed a dataset of 97 species to explore whether intrafloral temperature differences were correlated within clades (phylogenetic signal), or whether the variation seen was diverse enough to suggest that floral temperature patterns are influenced by the abiotic or pollinator-related niches to which plant species are adapted. RESULTS Some phylogenetic signal was observed, with both the Asteraceae and species of Pelargonium being more similar than expected by chance, but with other species surveyed not showing signal. The Asteraceae tend to have large temperature differences across the floral surface, which may be due to floral architecture constraints within the family. Other families show no correlation, suggesting that patterning is influenced by pollinators and the environment.
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Affiliation(s)
- Sean A Rands
- School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol, BS8 1TQ, UK.
| | - Michael J M Harrap
- School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol, BS8 1TQ, UK
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Vejmělka F, Okrouhlík J, Lövy M, Šaffa G, Nevo E, Bennett NC, Šumbera R. Heat dissipation in subterranean rodents: the role of body region and social organisation. Sci Rep 2021; 11:2029. [PMID: 33479351 PMCID: PMC7820455 DOI: 10.1038/s41598-021-81404-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 12/30/2020] [Indexed: 01/29/2023] Open
Abstract
The relatively warm and very humid environment of burrows presents a challenge for thermoregulation of its mammalian inhabitants. It was found that African mole-rats dissipate body heat mainly through their venter, and social mole-rats dissipate more body heat compared to solitary species at lower temperatures. In addition, the pattern of the ventral surface temperature was suggested to be homogeneous in social mole-rats compared to a heterogeneous pattern in solitary mole-rats. To investigate this for subterranean rodents generally, we measured the surface temperatures of seven species with different degrees of sociality, phylogeny, and climate using infrared thermography. In all species, heat dissipation occurred mainly through the venter and the feet. Whereas the feet dissipated body heat at higher ambient temperatures and conserved it at lower ambient temperatures, the ventral surface temperature was relatively high in all temperatures indicating that heat dissipation to the environment through this body region is regulated mainly by behavioural means. Solitary species dissipated less heat through their dorsum than social species, and a tendency for this pattern was observed for the venter. The pattern of heterogeneity of surface temperature through the venter was not related to sociality of the various species. Our results demonstrate a general pattern of body heat exchange through the three studied body regions in subterranean rodents. Besides, isolated individuals of social species are less able to defend themselves against low ambient temperatures, which may handicap them if staying alone for a longer period, such as during and after dispersal events.
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Affiliation(s)
- František Vejmělka
- Department of Zoology, Faculty of Science, University of South Bohemia, 370 05, České Budějovice, Czech Republic
| | - Jan Okrouhlík
- Department of Zoology, Faculty of Science, University of South Bohemia, 370 05, České Budějovice, Czech Republic
- Department of Zoology and Entomology, Mammal Research Institute, University of Pretoria, Pretoria, 0002, South Africa
| | - Matěj Lövy
- Department of Zoology, Faculty of Science, University of South Bohemia, 370 05, České Budějovice, Czech Republic
| | - Gabriel Šaffa
- Department of Zoology, Faculty of Science, University of South Bohemia, 370 05, České Budějovice, Czech Republic
| | - Eviatar Nevo
- Institute of Evolution, University of Haifa, 3498838, Haifa, Israel
| | - Nigel Charles Bennett
- Department of Zoology and Entomology, Mammal Research Institute, University of Pretoria, Pretoria, 0002, South Africa
| | - Radim Šumbera
- Department of Zoology, Faculty of Science, University of South Bohemia, 370 05, České Budějovice, Czech Republic.
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Harrap MJM, Hempel de Ibarra N, Whitney HM, Rands SA. Floral temperature patterns can function as floral guides. ARTHROPOD-PLANT INTERACTIONS 2020; 14:193-206. [PMID: 32215113 PMCID: PMC7073333 DOI: 10.1007/s11829-020-09742-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 01/03/2020] [Indexed: 05/25/2023]
Abstract
Floral guides are signal patterns that lead pollinators to floral rewards after they have located the flower, and increase foraging efficiency and pollen transfer. Patterns of several floral signalling modalities, particularly colour patterns, have been identified as being able to function as floral guides. Floral temperature frequently shows patterns that can be used by bumblebees for locating and recognising the flower, but whether these temperature patterns can function as a floral guide has not been explored. Furthermore, how combined patterns (using multiple signalling modalities) affect floral guide function has only been investigated in a few modality combinations. We assessed how artificial flowers induce behaviours in bumblebees when rewards are indicated by unimodal temperature patterns, unimodal colour patterns or multimodal combinations of these. Bees visiting flowers with unimodal temperature patterns showed an increased probability of finding rewards and increased learning of reward location, compared to bees visiting flowers without patterns. However, flowers with contrasting unimodal colour patterns showed further guide-related behavioural changes in addition to these, such as reduced reward search times and attraction to the rewarding feeder without learning. This shows that temperature patterns alone can function as a floral guide, but with reduced efficiency. When temperature patterns were added to colour patterns, bees showed similar improvements in learning reward location and reducing their number of failed visits in addition to the responses seen to colour patterns. This demonstrates that temperature pattern guides can have beneficial effects on flower handling both when alone or alongside colour patterns.
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Affiliation(s)
- Michael J. M. Harrap
- School of Biological Sciences, University of Bristol, 24 Tyndall Ave, Bristol, BS8 1TQ UK
| | | | - Heather M. Whitney
- School of Biological Sciences, University of Bristol, 24 Tyndall Ave, Bristol, BS8 1TQ UK
| | - Sean A. Rands
- School of Biological Sciences, University of Bristol, 24 Tyndall Ave, Bristol, BS8 1TQ UK
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Harrap MJM, Lawson DA, Whitney HM, Rands SA. Cross-modal transfer in visual and nonvisual cues in bumblebees. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2019; 205:427-437. [PMID: 30859258 PMCID: PMC6579774 DOI: 10.1007/s00359-019-01320-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 02/10/2019] [Accepted: 02/14/2019] [Indexed: 10/27/2022]
Abstract
Bumblebees Bombus terrestris are good at learning to distinguish between patterned flowers. They can differentiate between flowers that differ only in their patterning of scent, surface texture, temperature, or electrostatic charge, in addition to visual patterns. As recently shown, bumblebees trained to discriminate between nonvisual scent patterns can transfer this learning to visually patterned flowers that show similar spatial patterning to the learnt scent patterns. Bumblebees can, therefore, transfer learnt patterns between different sensory modalities, without needing to relearn them. We used differential conditioning techniques to explore whether cross-modal transfer of learnt patterns also occurred between visual and temperature patterns. Bumblebees that successfully learnt to distinguish rewarding and unrewarding temperature patterns did not show any preferences for the corresponding unlearnt visual pattern. Similarly, bumblebees that learnt visual patterns did not transfer these to temperature patterns, suggesting that they are unable to transfer learning of temperature and visual patterns. We discuss how cross-modality pattern learning may be limited to modalities that have potentially strong neurological links, such as the previously demonstrated transfer between scent and visual patterns.
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Affiliation(s)
- Michael J. M. Harrap
- School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol, BS8 1TQ UK
| | - David A. Lawson
- School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Heather M. Whitney
- School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Sean A. Rands
- School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol, BS8 1TQ UK
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