Rhythmicity of the Pigments in the Compound Eye of<i>Daphnia longispina</i>(Cladocera)

Cellier-Michel, S.; Berthon, J.

doi:10.1080/02705060.2003.9663980

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…In addition to changes in ambient light caused by the daily environmental LD cycle, Daphnia may respond to changes in light intensity and wavelengths as they move higher and lower in the water column. It has been noted in Daphnia longispina that eye pigment migration is under circadian control (observed under both normal LD cycle conditions and constant illumination) [ 55 ]. Therefore, instead of regulating the phototransduction cascade to control for changing ambient light conditions, D. pulex may ‘shield’ its eyes in a time-of-day specific fashion such has been described in other crustaceans [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Genome-wide profiling of 24 hr diel rhythmicity in the water flea, Daphnia pulex: network analysis reveals rhythmic gene expression and enhances functional gene annotation

et al. 2016

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BackgroundMarine and freshwater zooplankton exhibit daily rhythmic patterns of behavior and physiology which may be regulated directly by the light:dark (LD) cycle and/or a molecular circadian clock. One of the best-studied zooplankton taxa, the freshwater crustacean Daphnia, has a 24 h diel vertical migration (DVM) behavior whereby the organism travels up and down through the water column daily. DVM plays a critical role in resource tracking and the behavioral avoidance of predators and damaging ultraviolet radiation. However, there is little information at the transcriptional level linking the expression patterns of genes to the rhythmic physiology/behavior of Daphnia.ResultsHere we analyzed genome-wide temporal transcriptional patterns from Daphnia pulex collected over a 44 h time period under a 12:12 LD cycle (diel) conditions using a cosine-fitting algorithm. We used a comprehensive network modeling and analysis approach to identify novel co-regulated rhythmic genes that have similar network topological properties and functional annotations as rhythmic genes identified by the cosine-fitting analyses. Furthermore, we used the network approach to predict with high accuracy novel gene-function associations, thus enhancing current functional annotations available for genes in this ecologically relevant model species. Our results reveal that genes in many functional groupings exhibit 24 h rhythms in their expression patterns under diel conditions. We highlight the rhythmic expression of immunity, oxidative detoxification, and sensory process genes. We discuss differences in the chronobiology of D. pulex from other well-characterized terrestrial arthropods.ConclusionsThis research adds to a growing body of literature suggesting the genetic mechanisms governing rhythmicity in crustaceans may be divergent from other arthropod lineages including insects. Lastly, these results highlight the power of using a network analysis approach to identify differential gene expression and provide novel functional annotation.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-016-2998-2) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Genome-wide profiling of 24 hr diel rhythmicity in the water flea, Daphnia pulex: network analysis reveals rhythmic gene expression and enhances functional gene annotation

et al. 2016

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“…However, in our study, the melanin concentrations were low and did not differ between unexposed and exposed animals, suggesting that pigment level was not a plastic trait and that induction of photo-protective melanins was not causing the more relaxed response to UVR among previously exposed individuals. Apart from UVR-avoidance, many zooplankton taxa can also display other UVR defences such as photoenzymatic repair and the induction of internal antioxidants [36,37], which may help non-pigmented animals to survive UVR exposure.…”

Section: Discussionmentioning

confidence: 99%

Induced tolerance expressed as relaxed behavioural threat response in millimetre-sized aquatic organisms

et al. 2014

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Natural selection shapes behaviour in all organisms, but this is difficult to study in small, millimetre-sized, organisms. With novel labelling and tracking techniques, based on nanotechnology, we here show how behaviour in zooplankton (Daphnia magna) is affected by size, morphology and previous exposure to detrimental ultraviolet radiation (UVR). All individuals responded with immediate downward swimming to UVR exposure, but when released from the threat they rapidly returned to the surface. Large individuals swam faster and generally travelled longer distances than small individuals. Interestingly, individuals previously exposed to UVR (during several generations) showed a more relaxed response to UVR and travelled shorter total distances than those that were naive to UVR, suggesting induced tolerance to the threat. In addition, animals previously exposed to UVR also had smaller eyes than the naive ones, whereas UVR-protective melanin pigmentation of the animals was similar between populations. Finally, we show that smaller individuals have lower capacity to avoid UVR which could explain patterns in natural systems of lower migration amplitudes in small individuals. The ability to change behavioural patterns in response to a threat, in this case UVR, adds to our understanding of how organisms navigate in the 'landscape of fear', and this has important implications for individual fitness and for interaction strengths in biotic interactions.

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“…Daphnia and other cladoceran species have, as per many other planktonic organisms, developed escape strategies among which a light-entrained circadian behavior Pigment-dispersing hormone in Daphnia 3419 known as diel vertical migration (DVM) in the water body is probably the most important [78][79][80][81]. Furthermore, many other diel rhythmic and photoperiod-dependent behaviours are known for cladoceran species such as circadian eyepigment movements, growth and reproductive diapause control [82][83][84][85]. In Daphnia, an endogenous biological clock is known to exist from behavioural analysis of the DVM [86], but the neuronal control of this behavior is not known.…”

Section: Discussionmentioning

confidence: 99%

Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity

Strauß

Zhang

Verleyen

et al. 2011

Cell. Mol. Life Sci.

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We report identification of a beta-type pigment-dispersing hormone (PDH) identical in two water flea species, Daphnia magna and Daphnia pulex. It has been identified by cloning of precursors, chromatographic isolation from tissue extracts followed by immunoassays and de novo-mass spectrometric sequencing. The peptide is restricted to a complex system of distinct interneurons in the brain and visual ganglia, but does not occur in neurosecretory cells projecting to neurohemal organs as in decapod crustaceans. Thirteen neuron types individually identified and reconstructed by immunohistochemistry were almost identical in terms of positions and projection patterns in both species. Several neurons invade and form plexuses in visual ganglia and major brain neuropils including the central body. Five neuron types show contralateral pathways and form plexuses in the lateral, dorsal, or postlateral brain neuropils. Others are local interneurons, and a tritocerebral neuron connects the protocerebrum with the neuropil of the locomotory second antenna. Two visual ganglia neuron types lateral to the medulla closely resemble insect medulla lateral circadian clock neurons containing pigment-dispersing factor based upon positional and projectional criteria. Experiments under 12:12 h light/dark cycles and constant light or darkness conditions showed significant circadian changes in numbers and activities of one type of medulla lateral PDH neuron with an acrophase in the evening. This simple PDH system shows striking homologies to PDH systems in decapod crustaceans and well-known clock neurons in several insects, which suggests evolutionary conservation of an ancient peptidergic interneuronal system that is part of biological clocks.

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Rhythmicity of the Pigments in the Compound Eye ofDaphnia longispina(Cladocera)

Cited by 5 publications

References 15 publications

Genome-wide profiling of 24 hr diel rhythmicity in the water flea, Daphnia pulex: network analysis reveals rhythmic gene expression and enhances functional gene annotation

Genome-wide profiling of 24 hr diel rhythmicity in the water flea, Daphnia pulex: network analysis reveals rhythmic gene expression and enhances functional gene annotation

Induced tolerance expressed as relaxed behavioural threat response in millimetre-sized aquatic organisms

Pigment-dispersing hormone in Daphnia interneurons, one type homologous to insect clock neurons displaying circadian rhythmicity

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