Spatial distribution and structure of benthic polychaete communities of Essaouira intertidal rocky shores (Atlantic coast of Morocco)

Chouikh, Nor-eddine; Gillet, Patrick; Langston, W.J.; Cheggour, Mohamed; Maarouf, Abdelmalek; Mouabad, Abdelfattah

doi:10.1007/s00343-019-8286-7

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…After a planktonic larval phase during which animals get dispersed by currents, the worm switches to a benthic lifestyle that ends with a metamorphic maturation into a free-swimming spawning form [ 31 ]. It inhabits temperate to tropical shores worldwide, typically at depths of 0 to 10 m [ 35 , 36 ]. The experimental culture used here derives from the Mediterranean Sea, where the worm is part of the ecologically important Posedonia sea grass meadows [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Molecular circadian rhythms are robust in marine annelids lacking rhythmic behavior

Häfker,

Holcik,

Mat

et al. 2024

PLoS Biol

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The circadian clock controls behavior and metabolism in various organisms. However, the exact timing and strength of rhythmic phenotypes can vary significantly between individuals of the same species. This is highly relevant for rhythmically complex marine environments where organismal rhythmic diversity likely permits the occupation of different microenvironments. When investigating circadian locomotor behavior of Platynereis dumerilii, a model system for marine molecular chronobiology, we found strain-specific, high variability between individual worms. The individual patterns were maintained for several weeks. A diel head transcriptome comparison of behaviorally rhythmic versus arrhythmic wild-type worms showed that 24-h cycling of core circadian clock transcripts is identical between both behavioral phenotypes. While behaviorally arrhythmic worms showed a similar total number of cycling transcripts compared to their behaviorally rhythmic counterparts, the annotation categories of their transcripts, however, differed substantially. Consistent with their locomotor phenotype, behaviorally rhythmic worms exhibit an enrichment of cycling transcripts related to neuronal/behavioral processes. In contrast, behaviorally arrhythmic worms showed significantly increased diel cycling for metabolism- and physiology-related transcripts. The prominent role of the neuropeptide pigment-dispersing factor (PDF) in Drosophila circadian behavior prompted us to test for a possible functional involvement of Platynereis pdf. Differing from its role in Drosophila, loss of pdf impacts overall activity levels but shows only indirect effects on rhythmicity. Our results show that individuals arrhythmic in a given process can show increased rhythmicity in others. Across the Platynereis population, rhythmic phenotypes exist as a continuum, with no distinct “boundaries” between rhythmicity and arrhythmicity. We suggest that such diel rhythm breadth is an important biodiversity resource enabling the species to quickly adapt to heterogeneous or changing marine environments. In times of massive sequencing, our work also emphasizes the importance of time series and functional tests.

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Section: Introductionmentioning

confidence: 99%

Molecular circadian rhythms are robust in marine annelids lacking rhythmic behavior

Häfker,

Holcik,

Mat

et al. 2024

PLoS Biol

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“…Polychaetes are common infauna of the coastal intertidal zone and contribute to the remediation of sediment and ecological recovery in natural waters (Koo and Seo, 2017;Chouikh et al, 2020;Gopal et al, 2020;Fang et al, 2021b). Many studies have been conducted on the relationship between sediment and polychaete from several aspects, such as sediment selectivity, irrigation, burrowing, dissolved oxygen and microbial community (Papaspyrou et al, 2006;Shull et al, 2009;Crane and Merz, 2017;Fang et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Burrow Architecture of the Polychaete Perinereis Aibuhitensis

Fang

Zhang³

et al. 2022

Front. Mar. Sci.

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Bioturbation of infauna plays an important role in the biogeochemical processing of sediments. Infaunal animals build burrows and enlarge the sediment-water interface by their activities and so bioturbation is closely related with burrow structure and animal behavior in the sediment. The purpose of this study is to explore the characteristics of Perinereis aibuhitensis burrow structures with the factors of months and animal sizes (0-1g, 1-2g, 2-3g, 3-4g, and >4g), which would also provide useful knowledge of infauna behavioral ecology. The dimension and complexity of the burrows of P. aibuhitensis were measured by dissecting sediments. The results showed that there were three burrow shapes of P. aibuhitensis, i.e., I, Y and U shapes. Overall, the order of abundance of each of the three burrow shapes were I > Y > U. Larger P. aibuhitensis are inclined to build Y- and U-shaped burrows in June and August. There were significant differences in the tunnel diameter, burrow depth and burrow length separately between different polychaete size classes (P< 0.001). In February and August, the burrow depths and burrow lengths of P. aibuhitensis individuals with body weights of 1-2 g and 2-3 g were significantly greater than in other months (P< 0.001). P. aibuhitensis individuals of 1-2 g and 3-4 g body weight had significantly more burrow openings and branches in August than in February (P< 0.001). Within the same month, the burrow HEindex increased with increasing polychaete size, and when the sizes were 1-2 g, 2-3 g and 3-4 g, the complexity in August was higher than that in other months. This study suggests that I-shaped burrow dominants the burrow architecture of P. aibuhitensis. The polychaete with large size has a higher HEindex (burrow complexity) indicating a strong bioturbation ability. Y-shaped burrows are more conducive to the survival of P. aibuhitensis in hot weather. In order to adapt to environmental stresses outside, P. aibuhitensis usually builds deeper burrows.

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“…For marine broadcast spawners like P. dumerilii , the possibilities to select the habitat they encounter upon settling can be very limited. The worms inhabit temperate to tropical shores worldwide, typically at depths of 0-10 m 41, 42 .…”

Section: Introductionmentioning

confidence: 99%

“…After a planktonic larvae phase during which animals get dispersed by currents, the worm switches to a benthic lifestyle that ends with a metamorphic maturation into a free-swimming spawning form [27]. It inhabits temperate to tropical shores worldwide, typically at depths of 0-10 m [31, 32]. The experimental culture used here derives from the Mediterranean, where the worm is typically part of the ecologically important Posedonia sea grass meadows [30].…”

Section: Introductionmentioning

confidence: 99%

Behavioral rhythms are bad predictors of general organismal rhythmicity

Häfker

Holcik

Vadiwala

et al. 2022

Preprint

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The 24 hour day/night cycle prominently controls behavior and physiology. Most diel behaviors are under circadian clock control, but behavioral rhythmicity also exhibits significant individual diversity. Even genetically identical clones raised under the same conditions can develop distinct behavioral mannerisms. While terrestrial model systems have provided key molecular insights, the variability and molecular basis of diel rhythms in marine animals are much less investigated, although critically informative for evolutionary and ecological hypotheses. Here we investigate the phenotypic diversity of diel locomotor rhythms in the marine annelid Platynereis dumerilii. Individual-specific diel activity patterns are maintained over time, but differ strongly even between co-raised siblings. Knock-out of pigment-dispersing factor (PDF), a neuropeptide central to diel rhythmicity in Drosophila melanogaster, reveals only limited contributions of PDF to rhythmic behavioral diversity. Diel transcriptomes sampled from behaviorally rhythmic versus arrhythmic worms show no differences in circadian core clock transcript oscillations. Instead, behaviorally rhythmic worms exhibit a distinct enrichment of cycling transcripts related to behavior and neuronal differentiation, while behaviorally arrhythmic worms show an enrichment of metabolic and transport-related diel-cycling transcripts. Cycling of matrix metalloproteinases suggests that individual rhythmicity may be influenced via extracellular matrix remodeling and neuropeptide processing. Our results emphasize that organismal rhythmicity is highly complex and not necessarily properly reflected by a single read-out (like behavior or clock gene expression). We hypothesize that diversity in diel behavioral patterns allows for an adjustment to (micro)habitat conditions in the wild, thereby impacting on population fitness and adaptability to changing environmental conditions.

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Spatial distribution and structure of benthic polychaete communities of Essaouira intertidal rocky shores (Atlantic coast of Morocco)

Cited by 6 publications

References 32 publications

Molecular circadian rhythms are robust in marine annelids lacking rhythmic behavior

Molecular circadian rhythms are robust in marine annelids lacking rhythmic behavior

Factors Affecting Burrow Architecture of the Polychaete Perinereis Aibuhitensis

Behavioral rhythms are bad predictors of general organismal rhythmicity

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