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Mironov VL, Linkevich EV. Effects of the lunar cycle on ecosystem and heterotrophic respiration in a boreal Sphagnum-dominated peatland. Chronobiol Int 2024; 41:929-940. [PMID: 38888285 DOI: 10.1080/07420528.2024.2365825] [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: 04/01/2024] [Revised: 05/25/2024] [Accepted: 06/04/2024] [Indexed: 06/20/2024]
Abstract
The growth of Sphagnum is influenced by the lunar cycle, which suggests a corresponding carbon (C) accumulation rhythm in peatlands. However, this rhythm can only occur if C accumulation from Sphagnum growth is not offset by its total losses through respiration and other processes. To address the uncertainty, through correlation-regression analysis we examine the influence of the lunar cycle on recent measurements of ecosystem (ER) and heterotrophic (Rh) respiration conducted by Järveoja and colleagues on the oligotrophic peatland of Degerö Stormyr. We found that ER and Rh accelerated near the full moon and slowed down near the new moon. The response of the hourly ER to the lunar cycle is significant from 22:00 to 8:00 and is not significant beyond this range. This response was concentrated in the initial and finished phases of the season, but during the middle of the season it disappeared. This behavior could potentially be caused by the high sensitivity of the Sphagnum cover to moonlight, as well as the sensitivity to the lunar cycle of only the nocturnal component ER. During most of the day, the lunar cycle had a significant effect on hourly Rh, with the highest impact observed between 5:00 and 10:00 and at 20:00. The greatest impact occurs during those hours when ER declines, and possibly Sphagnum photosynthetic productivity peaks. The findings suggest a circalunar rhythm of C accumulation in peatlands due to the opposite trends between C accumulation during Sphagnum growth and C losses with respiration during the lunar cycle.
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Affiliation(s)
- Victor L Mironov
- Department of Multidisciplinary Scientific Research of the Karelian Research Centre of the Russian Academy of Sciences, Petrozavodsk, Russia
| | - Elizaveta V Linkevich
- Department of Multidisciplinary Scientific Research of the Karelian Research Centre of the Russian Academy of Sciences, Petrozavodsk, Russia
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Gairin E, Dussenne M, Mercader M, Berthe C, Reynaud M, Metian M, Mills SC, Lenfant P, Besseau L, Bertucci F, Lecchini D. Harbours as unique environmental sites of multiple anthropogenic stressors on fish hormonal systems. Mol Cell Endocrinol 2022; 555:111727. [PMID: 35863654 DOI: 10.1016/j.mce.2022.111727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 07/04/2022] [Accepted: 07/13/2022] [Indexed: 10/17/2022]
Abstract
Fish development and acclimation to environmental conditions are strongly mediated by the hormonal endocrine system. In environments contaminated by anthropogenic stressors, hormonal pathway alterations can be detrimental for growth, survival, fitness, and at a larger scale for population maintenance. In the context of increasingly contaminated marine environments worldwide, numerous laboratory studies have confirmed the effect of one or a combination of pollutants on fish hormonal systems. However, this has not been confirmed in situ. In this review, we explore the body of knowledge related to the influence of anthropogenic stressors disrupting fish endocrine systems, recent advances (focusing on thyroid hormones and stress hormones such as cortisol), and potential research perspectives. Through this review, we highlight how harbours can be used as "in situ laboratories" given the variety of anthropogenic stressors (such as plastic, chemical, sound, light pollution, and invasive species) that can be simultaneously investigated in harbours over long periods of time.
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Affiliation(s)
- Emma Gairin
- Marine Eco-Evo-Devo Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-Son, Kunigami District, 904-0495, Okinawa, Japan.
| | - Mélanie Dussenne
- Sorbonne Université, CNRS UMR Biologie Intégrative des Organismes Marins (BIOM), F-66650, Banyuls-sur-Mer, France
| | - Manon Mercader
- Marine Eco-Evo-Devo Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-Son, Kunigami District, 904-0495, Okinawa, Japan
| | - Cécile Berthe
- Laboratoire d'Excellence "CORAIL", France; PSL Université Paris, EPHE-UPVD-CNRS, UAR3278 CRIOBE, 98729, Moorea, French Polynesia
| | - Mathieu Reynaud
- Marine Eco-Evo-Devo Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-Son, Kunigami District, 904-0495, Okinawa, Japan; PSL Université Paris, EPHE-UPVD-CNRS, UAR3278 CRIOBE, 98729, Moorea, French Polynesia
| | - Marc Metian
- International Atomic Energy Agency - Environment Laboratories, 4a Quai Antoine 1er, MC, 98000, Principality of Monaco, Monaco
| | - Suzanne C Mills
- Laboratoire d'Excellence "CORAIL", France; PSL Université Paris, EPHE-UPVD-CNRS, UAR3278 CRIOBE, 98729, Moorea, French Polynesia
| | - Philippe Lenfant
- Université de Perpignan Via Domitia, Centre de Formation et de Recherche sur les Environnements Méditerranéens, UMR 5110, 58 Avenue Paul Alduy, F-66860, Perpignan, France
| | - Laurence Besseau
- Sorbonne Université, CNRS UMR Biologie Intégrative des Organismes Marins (BIOM), F-66650, Banyuls-sur-Mer, France
| | - Frédéric Bertucci
- Functional and Evolutionary Morphology Lab, University of Liège, 4000, Liege, Belgium
| | - David Lecchini
- Laboratoire d'Excellence "CORAIL", France; PSL Université Paris, EPHE-UPVD-CNRS, UAR3278 CRIOBE, 98729, Moorea, French Polynesia
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Mironov VL, Kondratev AY, Mironova AV. Growth of Sphagnum is strongly rhythmic: contribution of the seasonal, circalunar and third components. PHYSIOLOGIA PLANTARUM 2020; 168:765-776. [PMID: 31613995 DOI: 10.1111/ppl.13037] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 10/06/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Affiliation(s)
- Victor L Mironov
- Institute of Biology of Karelian Research Centre RAS, Pushkinskaya st. 11, Petrozavodsk, 185910, Russia
| | - Aleksei Y Kondratev
- National Research University Higher School of Economics, Soyuza Pechatnikov st. 16, St. Petersburg, 190121, Russia
- Institute for Regional Economic Studies RAS, Serpuhovskaya st. 38, St. Petersburg, 190013, Russia
| | - Anna V Mironova
- Tsitsin Main Botanical Garden RAS, Botanicheskaya st. 4, Moscow, 127276, Russia
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Abstract
Artificial light at night (ALAN) is increasing exponentially worldwide, accelerated by the transition to new efficient lighting technologies. However, ALAN and resulting light pollution can cause unintended physiological consequences. In vertebrates, production of melatonin—the “hormone of darkness” and a key player in circadian regulation—can be suppressed by ALAN. In this paper, we provide an overview of research on melatonin and ALAN in vertebrates. We discuss how ALAN disrupts natural photic environments, its effect on melatonin and circadian rhythms, and different photoreceptor systems across vertebrate taxa. We then present the results of a systematic review in which we identified studies on melatonin under typical light-polluted conditions in fishes, amphibians, reptiles, birds, and mammals, including humans. Melatonin is suppressed by extremely low light intensities in many vertebrates, ranging from 0.01–0.03 lx for fishes and rodents to 6 lx for sensitive humans. Even lower, wavelength-dependent intensities are implied by some studies and require rigorous testing in ecological contexts. In many studies, melatonin suppression occurs at the minimum light levels tested, and, in better-studied groups, melatonin suppression is reported to occur at lower light levels. We identify major research gaps and conclude that, for most groups, crucial information is lacking. No studies were identified for amphibians and reptiles and long-term impacts of low-level ALAN exposure are unknown. Given the high sensitivity of vertebrate melatonin production to ALAN and the paucity of available information, it is crucial to research impacts of ALAN further in order to inform effective mitigation strategies for human health and the wellbeing and fitness of vertebrates in natural ecosystems.
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