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5 results for “tidal rhythm”
Phenology in the deep sea: Seasonal and tidal feeding rhythms in a keystone octocoral
<p>Biological rhythms are widely known in terrestrial and marine systems, where the behavior or function of organisms may be tuned to environmental variation over periods from minutes to seasons or longer. Although well characterized in coastal environments, phenology remains poorly understood in the deep sea. Here we characterized intra-annual dynamics of feeding activity for the deep-sea octocoral <em>Paragorgia</em> <em>arborea</em>. Hourly changes in polyp activity were quantified using a time-lapse camera deployed for a year on Sur Ridge (1230 m depth; Northeast Pacific). The relationship between feeding and environmental variables, including surface primary production, temperature, acoustic backscatter, current speed and direction, was evaluated. Feeding activity was highly seasonal, with a dormancy period identified between January and early April, reflecting seasonal changes in food availability as suggested by primary production and acoustic backscatter data. Moreover, feeding varied with tides, which likely affected food delivery through cyclic oscillation in current speed and direction. This study provides the first evidence of behavioral rhythms in a coral species at depth greater than 1km. Information on the feeding biology of this cosmopolitan deep-sea octocoral will contribute to a better understanding of how future environmental change may affect deep-sea coral communities and the ecosystem services they provide.</p>
Phenology in the deep sea: Seasonal and tidal feeding rhythms in a keystone octocoral
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Endogenous rhythm shift and adaptation to the tidal environment in the freshwater snail
<p><span>Organisms have an endogenous timekeeping system to coordinate their biological processes with environmental cycles, allowing adaptation to external rhythmic changes in their environment. Modification of biological clocks could contribute to range expansion in a novel rhythmic environment. We hypothesized that populations of freshwater species near estuaries have acquired a circatidal rhythm to synchronize with the tidal cycle. Here, we compared the locomotion activity and gene expression rhythms of the freshwater snail <em>Semisulcospira reiniana</em> between individuals inhabiting freshwater and brackish-water areas. Individuals inhabiting brackish-water areas exhibited a rhythmic activity pattern coordinated with the tidal cycle under both field and laboratory conditions. Individuals inhabiting upstream freshwater areas showed a nocturnal activity pattern. The proportion of circadian oscillating genes was greater in freshwater than </span><span>in </span><span>brackish-water individuals, while that of circatidal oscillating genes was greater in brackish-water than </span><span>in freshwater </span><span>individuals. Interestingly, expression of 16 genes exhibited circadian and circatidal rhythms in freshwater and brackish-water individuals, respectively. Additionally, transcriptome-wide population genetic analyses supported our assumption that these two populations are genetically almost identical. These findings suggest that the slight divergence contributed to the shift in the timekeeping system</span><span>, </span><span>and that endogenous rhythms could differ in their periods between freshwater and brackish-water populations. Our results provide evidence of the evolution of endogenous rhythm via range expansion to novel rhythmic environment in a single species.</span></p>
FIG. 1. Evening high and low tidal heights during 3 in Larval release rhythms of four species (family Grapsidae and Ocypodidae) of intertidal crabs on a coastal at in western central Taiwan
FIG. 1. Evening high and low tidal heights during 3 August to 30 September 1994. Closed and open circles represent new and full moon phases, respectively.
Endogenous rhythm shift and adaptation to the tidal environment in the freshwater snail
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Allen Brain Atlas
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.