Spontaneous internal desynchronization of locomotor activity and body temperature rhythms from plasma melatonin rhythm in rats exposed to constant dim light

Aguzzi, Jacopo; Bullock, Nicole; Tosini, Gianluca

doi:10.1186/1740-3391-4-6

Cited by 37 publications

(33 citation statements)

References 20 publications

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“…The dashed horizontal lines correspond to the midline estimating statistic of rhythm (MESOR)(Aguzzi et al, 2006). Anoplopoma fimbria in (a) June and (b) July, (c) Eptatretus stoutii in December, and finally, (d) juvenile crabs in December 2013.…”

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confidence: 99%

Ocean Observatories as a Tool to Advance Gas Hydrate Research

Scherwath

Thomsen

Riedel

et al. 2019

Earth and Space Science

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Since 2009, unprecedented comprehensive long-term gas hydrate observations have become available from Ocean Networks Canada's NEPTUNE cabled ocean observatory at the northern Cascadia margin. Several experiments demonstrate the scientific importance of permanent power and Internet connectivity to the ocean floor as they have advanced the field of gas hydrate related research. One example is the cabled crawler Wally at Barkley Canyon, enabling live in situ exploration of the hydrate mounds and its associated benthic communities through the crawler's mobility and permanent accessibility throughout the year. Another example is a bubble-imaging sonar at Clayoquot Slope, revealing the strong relationship between ebullition of natural gas and tidal pressure, without apparent correlation to earthquakes, storms, or temperature fluctuations, in year-long continuous recordings. Finally, regular observatory maintenance cruises allow additional science sampling including echo-sounder surveys to extend the observatory footprint. Long-term trends in the data are not yet apparent but can also become evident from continuous measurements, as ocean observatories such as NEPTUNE are built for a 25-year lifetime, and expansion of the observatory networks makes these findings comparable and testable.Plain Language Summary Natural gas near the ocean floor creates a rapidly changing environment where it is important to collect data continuously in order to determine the magnitude, speed, and potential mechanism of change. This long-standing challenge of year-round access to the deep ocean has been tackled by Ocean Networks Canada through cabling the northern Cascadia seafloor, providing power and Internet communication-ideal for power-hungry instruments, large data volumes, and real-time access. The presence of gas influences the shape of the seafloor, animal activity, and potential escape of methane, a potent greenhouse gas. A seafloor crawler Wally was operated around deep canyon mounds of gas hydrate (a solid gas-water composite) since 2009 and helped discover environmental changes influencing sea life. Further along the continental slope, an acoustic sonar monitored rising methane bubbles where the bubbling appears to be controlled neither by earthquakes, winter storms, nor subtle temperature changes but actually strongly by tidal pressure. Regular maintenance of the observatory by ship allows more data to be collected near the cabled seafloor sites, extending the observations to a larger area. Ocean observatories are built to last decades and therefore more data for more research can be collected, potentially detecting relatively slow processes as well.

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mentioning

confidence: 99%

Ocean Observatories as a Tool to Advance Gas Hydrate Research

Scherwath

Thomsen

Riedel

et al. 2019

Earth and Space Science

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“…the waveform) was obtained by averaging values within all subset per corresponding 10 min bins. Phase duration and timing for bioluminescence were statistically assessed using the Midline Estimating Statistic Of Rhythm (MESOR)73 all waveform values were re-averaged and the resulting mean represented as a horizontal threshold line on the waveform plots. This threshold was used to identify waveform peaks as temporal amplitude of significant increments (i.e.…”

Section: Methodsmentioning

confidence: 99%

Inertial bioluminescence rhythms at the Capo Passero (KM3NeT-Italia) site, Central Mediterranean Sea

Aguzzi

Fanelli

Ciuffardi

et al. 2017

Sci Rep

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In the deep sea, the sense of time is dependent on geophysical fluctuations, such as internal tides and atmospheric-related inertial currents, rather than day-night rhythms. Deep-sea neutrino telescopes instrumented with light detecting Photo-Multiplier Tubes (PMT) can be used to describe the synchronization of bioluminescent activity of abyssopelagic organisms with hydrodynamic cycles. PMT readings at 8 different depths (from 3069 to 3349 m) of the NEMO Phase 2 prototype, deployed offshore Capo Passero (Sicily) at the KM3NeT-Italia site, were used to characterize rhythmic bioluminescence patterns in June 2013, in response to water mass movements. We found a significant (p < 0.05) 20.5 h periodicity in the bioluminescence signal, corresponding to inertial fluctuations. Waveform and Fourier analyses of PMT data and tower orientation were carried out to identify phases (i.e. the timing of peaks) by subdividing time series on the length of detected inertial periodicity. A phase overlap between rhythms and cycles suggests a mechanical stimulation of bioluminescence, as organisms carried by currents collide with the telescope infrastructure, resulting in the emission of light. A bathymetric shift in PMT phases indicated that organisms travelled in discontinuous deep-sea undular vortices consisting of chains of inertially pulsating mesoscale cyclones/anticyclones, which to date remain poorly known.

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“…The non-visual neural system in the brain gives rise to altered physiological aspects, including heart rate variability, blood pressure, body temperature and melatonin secretion, during exposure to light with different spectral compositions that are not caused by the well-known primary visual pathway (Morita and Tokura 1998;Yasukouchi and Ishibashi 2005). The non-visual neural system in rodents has been studied by measuring melatonin secretion, body temperature and behavioral rhythms that respond to various conditions of light stimuli (Cardinali et al 1972;Brainard et al 1984;Argamaso et al 1995;Aguzzi et al 2006).…”

Section: Shigeki Watanuki C Akira Yasukouchi C and Takeshi Moritamentioning

confidence: 99%

Responses of the hypothalamic paraventricular neurons to light stimulation with different wavelengths in the rat

Lee

Jung

Kim

et al. 2008

Biological Rhythm Research

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During exposure to light with different spectral compositions, the non-visual neural system in the brain gives rise to altered various physiological aspects that are not caused by the well-known primary visual pathway. This study has been designed to investigate non-visual information processing that affects the biological rhythms in humans by studying the properties of paraventricular neurons in Sprague-Dawley rats under urethane anesthesia. The responses of paraventricular nucleus neurons by stimulation with different wavelengths of light were recorded. It turned out that neural responses were most sensitive to 550 nm wavelength light. This result suggests that a non-visual system in the hypothalamus including the paraventricular nucleus responds to light stimuli to control biological rhythms or autonomic functions.

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Spontaneous internal desynchronization of locomotor activity and body temperature rhythms from plasma melatonin rhythm in rats exposed to constant dim light

Cited by 37 publications

References 20 publications

Ocean Observatories as a Tool to Advance Gas Hydrate Research

Ocean Observatories as a Tool to Advance Gas Hydrate Research

Inertial bioluminescence rhythms at the Capo Passero (KM3NeT-Italia) site, Central Mediterranean Sea

Responses of the hypothalamic paraventricular neurons to light stimulation with different wavelengths in the rat

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