Rhythms at the bottom of the deep sea: Cyclic current flow changes and melatonin patterns in two species of demersal fish

Wagner, Hans‐Joachim; Kemp, Kirsty M.; Mattheus, Ulrich; Priede, Imants George

doi:10.1016/j.dsr.2007.08.005

Cited by 54 publications

(57 citation statements)

References 32 publications

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“…Unfortunately, very little research on the daily rhythmic lives of deep-sea organisms has been conducted, preventing strong conclusions on the rhythmic physiology of this community. However, studies by Maynou and Cartes (1998), Wagner et al (2007), Modica et al (2014) and Cuvelier et al (2014) have provided some hints on rhythmicity in the deep.…”

Section: A Review Of Rhythmic Physiology Research In Animals From Arrmentioning

confidence: 99%

Life in a dark biosphere: a review of circadian physiology in “arrhythmic” environments

2016

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Most of the life with which humans interact is exposed to highly rhythmic and extremely predictable changes in illumination that occur with the daily events of sunrise and sunset. However, while the influence of the sun feels omnipotent to surface dwellers such as ourselves, life on earth is dominated, in terms of biomass, by organisms isolated from the direct effects of the sun. A limited understanding of what life is like away from the sun can be inferred from our knowledge of physiology and ecology in the light biosphere, but a full understanding can only be gained by studying animals from the dark biosphere, both in the laboratory and in their natural habitats. One of the least understood aspects of life in the dark biosphere is the rhythmicity of physiology and what it means to live in an environment of low or no rhythmicity. Here we describe methods that may be used to understand rhythmic physiology in the dark and summarise some of the studies of rhythmic physiology in “arrhythmic” environments, such as the poles, deep sea and caves. We review what can be understood about the adaptive value of rhythmic physiology on the Earth’s surface from studies of animals from arrhythmic environments and what role a circadian clock may play in the dark.

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Section: A Review Of Rhythmic Physiology Research In Animals From Arrmentioning

confidence: 99%

Life in a dark biosphere: a review of circadian physiology in “arrhythmic” environments

2016

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“…This question is relevant for benthic species on the shelf and upper slope, where light has been assumed to be the predominant zeitgeber synchronizing biological activity (Aguzzi et al 2011). In a previous study at 2700 m depth in the northeast Atlantic, Wagner et al (2007) showed that 12.4-h periodic peaks in current speed (similar to those in the present study) may represent a zeitgeber for demersal fish. Nephrops norvegicus possess mechanoreceptors that are distributed throughout the body (cuticular setae, first and second antennae, and statocysts) and are used for tactile exploration, perception of water movement, and detection of acoustic stimuli (Katoh et al 2013).…”

Section: Discussionmentioning

confidence: 77%

“…Every 12.4 h, lobsters were exposed to water currents of a 2-h duration with a speed of 10 cm s −1 . The semi-diurnal periodicity of 12.4 h simulates a periodic intensification of seabed current speed that has been proposed to entrain physiological rhythms in two species of deep-sea, North Atlantic fishes (Wagner et al 2007). …”

Section: Experimental Designmentioning

confidence: 99%

“…In fact, the physical limit for penetration of sunlight (~1000 m in oligotrophic waters) defines a depth range known as the "twilight zone" (Hopkins 1985). Below this depth, tidal currents could replace sunlight as the synchronizer of animal behaviour and physiology (Wagner et al 2007;). However, depth limits for light penetration depend on turbidity and other factors, and tidal regimes have strong geographical variability, depending on seafloor bathymetry, which results in numerous possible combinations of these cues.…”

Section: Introductionmentioning

confidence: 98%

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Effect of simulated tidal currents on the burrow emergence rhythms of the Norway lobster (Nephrops norvegicus)

et al. 2015

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time orientated downstream during darkness hours. Moreover, four of the 15 lobsters showed that a current could act as a putative zeitgeber for the circadian oscillator, but further experiments are needed to confirm this finding. These results indicate that tidal current is an important parameter to consider when interpreting fishery-dependent data and data from video surveys, not only N. norvegicus, but for other deep-water epibenthic species.

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“…The 12 h harmonics suggest that the observed pattern is more likely tidally driven (rather than related to the day-night cycle) and might reflect the influence of internal tidal waves, which are known to affect mixing processes and consequently physicochemical conditions of deep basins' waters in fjords (Inall and Rippeth 2002;Garrett 2003). Similarly, Wagner et al (2007) showed the occurrence of an endogenous clock in deep-sea fishes in relation with internal waves affecting water flow variations. However, we were not able to determine if the observed signal was linked to endogenous or exogenous rhythms in response to change in habitat condition.…”

Section: Biological Rhythmsmentioning

confidence: 84%

The VENUS cabled observatory as a method to observe fish behaviour and species assemblages in a hypoxic fjord, Saanich Inlet (British Columbia, Canada)

Matabos

Piechaud

MontignyFrançois

et al. 2015

Can. J. Fish. Aquat. Sci.

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Studies reporting processes that may shape marine benthic communities under the seasonal scale are rare at depths >50 m. In this study, the use of the VENUS multidisciplinary cabled observatory provided 2-month high-resolution data combining quantitative biology and environmental data in Saanich Inlet, a seasonally hypoxic fjord located on Vancouver Island (British Columbia, Canada). An ecological module equipped with a camera acquired a 3 min video clip every half hour during 2 months at 97 m depth in the oxygen fluctuation zone of the fjord. Results highlighted the role of the tidal cycle on species activity rhythms and confirmed the influence of oxygen fluctuations on benthic assemblage structure and species behaviour. However, environmental variables considered only explained a small proportion of the total variance in species data. This study demonstrates how seafloor observatories can be used to study species behaviour and community dynamics in relation to abiotic conditions by providing continuous access to multidisciplinary data. Résumé :Les études sur les processus qui influencent la structure des communautés marines benthiques profondes (>50 m) à des échelles inférieures aux saisons sont rares. Dans cet article, l'utilisation de l'observatoire multidisciplinaire câblé VENUS a fourni 2 mois de données haute fréquence combinant des données quantitatives biologiques et environnementales dans le Saanich Inlet, un fjord hypoxique saisonnier localisé sur l'île de Vancouver (Colombie-Britannique, Canada). Un module écologique a enregistré des séquences vidéo de 3 min toutes les demi-heures pendant 2 mois à 97 m de profondeur dans la zone de fluctuation d'oxygène. Les résultats ont permis de mettre en évidence le rôle des cycles de marées sur l'activité rythmique des espèces et ont confirmé le rôle des variations temporelles des concentrations en oxygène sur la structure des assemblages faunistiques et le comportement des espèces benthiques. Cependant, les variables environnementales considérées expliquent une faible proportion de la variance. Cette étude démontre comment les observatoires sous-marins permettent d'étudier le comportement des espèces et la dynamique des communautés benthiques en relation avec les facteurs abiotiques, en fournissant un accès continu à des données multidisciplinaires.

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Rhythms at the bottom of the deep sea: Cyclic current flow changes and melatonin patterns in two species of demersal fish

Cited by 54 publications

References 32 publications

Life in a dark biosphere: a review of circadian physiology in “arrhythmic” environments

Life in a dark biosphere: a review of circadian physiology in “arrhythmic” environments

Effect of simulated tidal currents on the burrow emergence rhythms of the Norway lobster (Nephrops norvegicus)

The VENUS cabled observatory as a method to observe fish behaviour and species assemblages in a hypoxic fjord, Saanich Inlet (British Columbia, Canada)

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