Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers
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 bumble bee Bombus terrestris. JH is the major gonadotropin i...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Neurobiology of Sleep and Circadian Rhythms |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2451994420300080 |
| _version_ | 1818439619770843136 |
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| author | Atul Pandey Uzi Motro Guy Bloch |
| author_facet | Atul Pandey Uzi Motro Guy Bloch |
| author_sort | Atul Pandey |
| collection | DOAJ |
| description | 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 bumble bee Bombus terrestris. JH is the major gonadotropin in this species coordinating processes such as vitellogenesis, oogenesis, wax production, and behaviors associated with reproduction. It is unknown however, whether it also influences circadian processes. We topically treated newly-emerged bees with the allatoxin Precocene-I (P-I) to reduce circulating JH titers and applied the natural JH (JH-III) for replacement therapy. We repeated this experiment in three trials, each with bees from different source colonies. Measurements of ovarian activity suggest that our JH manipulations were effective; bees treated with P-I had inactive ovaries, and this effect was fully recovered by subsequent JH treatment. We found that JH augments the strength of circadian rhythms and the pace of rhythm development in individually isolated newly emerged worker bees. JH manipulation did not affect the free-running circadian period, overall level of locomotor activity, sleep amount, or sleep structure. Given that acute manipulation at an early age produced relatively long-lasting effects, we propose that JH effects on circadian rhythms are mostly organizational, accelerating the development or integration of the circadian system. |
| first_indexed | 2024-12-14T17:59:21Z |
| format | Article |
| id | doaj.art-44d124af91e2401c805de93e422b9508 |
| institution | Directory Open Access Journal |
| issn | 2451-9944 |
| language | English |
| last_indexed | 2024-12-14T17:59:21Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Neurobiology of Sleep and Circadian Rhythms |
| spelling | doaj.art-44d124af91e2401c805de93e422b95082022-12-21T22:52:28ZengElsevierNeurobiology of Sleep and Circadian Rhythms2451-99442020-11-019100056Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workersAtul Pandey0Uzi Motro1Guy Bloch2Department of Ecology, Evolution, and Behavior, The Hebrew University of Jerusalem, Jerusalem, IsraelDepartment of Ecology, Evolution, and Behavior, The Hebrew University of Jerusalem, Jerusalem, Israel; The Federmann Center for the Study of Rationality, The Hebrew University of Jerusalem, Jerusalem, IsraelDepartment of Ecology, Evolution, and Behavior, The Hebrew University of Jerusalem, Jerusalem, Israel; The Federmann Center for the Study of Rationality, The Hebrew University of Jerusalem, Jerusalem, Israel; Corresponding author. Department of Ecology, Evolution, and Behavior, The Hebrew University of Jerusalem, Jerusalem, Israel.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 bumble bee Bombus terrestris. JH is the major gonadotropin in this species coordinating processes such as vitellogenesis, oogenesis, wax production, and behaviors associated with reproduction. It is unknown however, whether it also influences circadian processes. We topically treated newly-emerged bees with the allatoxin Precocene-I (P-I) to reduce circulating JH titers and applied the natural JH (JH-III) for replacement therapy. We repeated this experiment in three trials, each with bees from different source colonies. Measurements of ovarian activity suggest that our JH manipulations were effective; bees treated with P-I had inactive ovaries, and this effect was fully recovered by subsequent JH treatment. We found that JH augments the strength of circadian rhythms and the pace of rhythm development in individually isolated newly emerged worker bees. JH manipulation did not affect the free-running circadian period, overall level of locomotor activity, sleep amount, or sleep structure. Given that acute manipulation at an early age produced relatively long-lasting effects, we propose that JH effects on circadian rhythms are mostly organizational, accelerating the development or integration of the circadian system.http://www.sciencedirect.com/science/article/pii/S2451994420300080HormoneJuvenile hormoneBumble beeBombus terrestrisCircadian rhythmsLocomotor activity |
| spellingShingle | Atul Pandey Uzi Motro Guy Bloch Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers Neurobiology of Sleep and Circadian Rhythms Hormone Juvenile hormone Bumble bee Bombus terrestris Circadian rhythms Locomotor activity |
| title | Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers |
| title_full | Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers |
| title_fullStr | Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers |
| title_full_unstemmed | Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers |
| title_short | Juvenile hormone affects the development and strength of circadian rhythms in young bumble bee (Bombus terrestris) workers |
| title_sort | juvenile hormone affects the development and strength of circadian rhythms in young bumble bee bombus terrestris workers |
| topic | Hormone Juvenile hormone Bumble bee Bombus terrestris Circadian rhythms Locomotor activity |
| url | http://www.sciencedirect.com/science/article/pii/S2451994420300080 |
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