Feeding mechanism of the polychaete Sabellaria alveolata revisited: reply to Riisgård &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp; Nielsen (2006)

Dubois, Stanislas F.; Barillé, Laurent; Cognie, Bruno; Beninger, Peter G.

doi:10.3354/meps328307

Cited by 6 publications

(16 citation statements)

References 17 publications

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“…Nielsen [14], these cilia sporadically bend in the downward longitudinal direction of the tentacular lament. Movability of these cilia has been con rmed, but the direction of ciliary movement has been observed as oblique towards the frontal surface by Dubois et al [55,58]. In any case, these previous observations of the activity of these cilia are consistent with our ndings on the innervation pattern, strongly suggesting that beating of these long cilia is under nervous control.…”

Section: Tentacular Lamentssupporting

confidence: 91%

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Ultrastructure and Functional Morphology of the Appendages in the Reef-Building Sedentary Polychaete Sabellaria Alveolata (Annelida, Sedentaria, Sabellida)

Meyer

André

Purschke

2020

Preprint

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Background: The sedentary polychaete Sabellaria alveolata, the sandcastle or honeycomb worm, possesses four different kinds of appendages besides the parapodia: opercular papillae, tentacular filaments, palps, and branchiae. It exhibits a highly specialized anterior end, the operculum, formed by the prostomium, peristomium, and two anterior segments. Besides the median organ, the operculum comprises opercular papillae, tentacular filaments, and palps. Paired branchiae are present from the second thoracic chaetiger onwards on the posteriorly following segments except for the last ones. Only the palps have been studied thus far by transmission electron microscopy in late larvae of a different species. In order to bridge the data gap, we investigated the appendages of S. alveolata by applying light microscopy, confocal laser scanning microscopy, scanning, and transmission electron microscopy. Results: In S. alveolata the entire body is covered by a thin cuticle characterized by the absence of layers of parallel collagen fibers with no differentiation between the various body regions including the branchiae. The opercular papillae bear numerous tufts of receptor cells and lack motile cilia. The tentacular filaments show a distinctive ciliation pattern; their most conspicuous morphological feature is their cell-free cartilaginous endoskeletal structure enclosed by ECM. Besides musculature the filaments include a single coelomic cavity but blood vessels are absent. The palps are ciliated with two coelomic cavities and a single blind-ending blood vessel. Besides external ciliation and receptor cells, the coelomate branchiae are highly vascularized and equipped with numerous blood spaces extending deep into the basal regions of the epidermal cells (diffusion distances: 150–400nm). Conclusions: All appendages, including the branchiae, bear receptor cells and, as such, are sensory. The opercular papillae resemble typical parapodial cirri. In contrast, the tentacular filaments have a double function: sensing, collecting and transporting particles. A similarity to branchiae can be excluded. The palps are typical grooved palps similar to another sabellariid studied. A revised classification of polychaete branchiae is suggested; thereby, the branchiae of S. alveolata belong to the most common type comprising coelom, musculature, and blood vessels. The results indicate that diffusion distances between blood and environment have been underestimated in many cases.

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Section: Tentacular Lamentssupporting

confidence: 91%

“…It has been argued that they represent artifacts [58]. From live and recorded video observations, it is evident that the lateral grouped cilia often project orthogonally from the surface of the tentacular laments and appear to be immobile [14,55,58]. Nevertheless, according to Riisgård and…”

Section: Tentacular Lamentsmentioning

confidence: 99%

Ultrastructure and Functional Morphology of the Appendages in the Reef-Building Sedentary Polychaete Sabellaria Alveolata (Annelida, Sedentaria, Sabellida)

Meyer

André

Purschke

2020

Preprint

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“…The research around this species has mainly focused on its physiology (i.e. reproduction, fecundity, feeding mode) (Dubois et al, 2003(Dubois et al, , 2005(Dubois et al, , 2006a(Dubois et al, , 2009 and its tube building activity (Fournier et al, 2010;Le Cam et al, 2011). Other studies have looked into the ecology of reefs with a particular interest on the associated fauna (Dias and Paula, 2001;Porta and Nicoletti, 2009;Schlund et al, 2016) and factors influencing it such as the reef's different growth stages (Dubois et al, 2002), epibionts (Dubois et al, 2006b), human trampling (Plicanti et al, 2016) and ecological status (Desroy et al, 2011).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…In the end, the interplay between recruitment and the engineered sediments dynamics seem responsible for the observed species turnover and abundance increase along the disturbance gradient. In addition, other factors linked to an increasing disturbance, like a higher oyster cover (Magallana gigas) probably also structure the associated fauna as shown by Dubois et al (2006). Indeed, oyster shells provide a suitable substratum for many sessile species and are known to enhance species richness and abundance (Lejart and Hily, 2011).…”

Section: Engineered Sediment Disturbance and Mechanisms Linked To Betmentioning

confidence: 99%

Interplay between abiotic factors and species assemblages mediated by the ecosystem engineer Sabellaria alveolata (Annelida: Polychaeta)

Jones

Dubois

Desroy

et al. 2018

Estuarine, Coastal and Shelf Science

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Sabellaria alveolata is a gregarious polychaete that uses sand particles to build three-dimensional structures known as reefs, fixed atop rocks or built on soft sediments. These structures are known to modify the local grain-size distribution and to host a highly diversified macrofauna, altered when the reef undergoes disturbances. The goal of this study was to investigate the different sedimentary and biological changes associated with the presence of a S. alveolata reef over two contrasting seasons (late winter and late summer), and how these changes were linked. Three different sediments were considered: the engineered sediment (the actual reef), the associated sediment (the soft sediment surrounding the reef structures) and a control soft sediment (i.e. no reef structures in close proximity). Univariate and multivariate comparisons of grain-size distribution, soft sediment characteristics (organic matter content, chlorophyll a, pheopigments and carbohydrate concentrations) and macrofauna were conducted between the different sediment types at both seasons and between the two seasons for each sediment type. A distance-based redundancy analyses (dbRDA) was used to investigate the link between the different environmental parameters and the macrofauna assemblages. Finally, we focused on a disturbance continuum of the engineered sediments proxied by an increase in the mud present in these sediments. The effects of a continuous and increasing disturbance on the associated fauna were investigated using pairwise beta diversity indices (Sørensen and Bray-Curtis dissimilarities and their decomposition into turnover and nestedness). Results showed a significant effect of the reef on the local sediment distribution (coarser sediments compared to the control) and on the benthic primary production (higher in the associated sediments). At both seasons, S. alveolata biomass and sediment principal mode were the environmental parameters which best differentiated the engineered, associated and control sediment assemblages. These two parameters are under the ecosystem engineer's influence stressing its importance in structuring benthic macrofauna. Furthermore, in late summer but not in late winter, presence/absence and abundance based beta diversity were positively correlated to our disturbance proxy (mud content) a tendency driven by a species replacement and a rise in the associated fauna density. Our first set of results highlight the importance of S. alveolata reefs as benthic primary production enhancers via their physical structure and their biological activity. The results Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site. obtained using beta diversity indices emphasize the importance of recruitment in structuring the reef's macrofauna andparadoxicallythe ecological value of S. alveolata degraded forms as biodiversity and recruitment promoters.

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“…Previous experiments using video-endoscopy (Dubois et al, 2005;Dubois et al, 2006b) revealed that S. alveolata exhibits several mechanisms related to pre-ingestive particle processing: (1) bi-directional particle transport on the tentacles, acting as a preliminary sorting mechanism before collection in food grooves, (2) pseudofeces production allowing individuals to reject excess particles before ingestion and (3) contribution of two peribuccal palps to clean up filamentary tentacles when overloaded. All these mechanisms probably contribute to maintain feeding activity under high seston concentration.…”

Section: Particle Loads and Feeding Activity Of Sabellaria Alveolatamentioning

confidence: 99%

Feeding response of the polychaete Sabellaria alveolata (Sabellariidae) to changes in seston concentration

Dubois

Barillé

Cognie

2009

Journal of Experimental Marine Biology and Ecology

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Sabellaria alveolata is a tube-building gregarious polychaete that constructs large biogenic reefs. In macrotidal shellfish ecosystems, this species competes for food with cultivated suspension-feeders. The suspension-feeding activity and clearance rate of S. alveolata were investigated in response to changes in seston concentration. A flow-through system was designed to study 225 cm 2 reef blocks with more than 500 individuals. The experimental conditions were characterized by increasing concentrations of suspended particulate matter ranging from 6.5 to 153.8 mg L −1 , while the organic content of the diet (microalgae Skeletonema costatum) decreased inversely from 49 to 9%, to mimic the dilution of organic matter by inorganic particles, characteristic of tidal resuspension. We showed that the clearance rate exponentially decreased in relation to an increase in SPM concentration. Clearance rate was estimated at 5.3 10 − 3 L h − 1 or 0.93 L h − 1 g − 1 (dry weight) for the lowest seston concentration (SPM = 6.5 mg L − 1) and reached the asymptote at CR = 1.97 10 − 3 L h − 1 or 0.35 L h − 1 g − 1 (dry weight) when SPM exceeded 45 mg L − 1. Using picture analyses of polychaete movements, we showed that, paradoxically, an increase in SPM concentration did not adversely affect the feeding activity of S. alveolata since the number of filtering individuals remained stable from SPM = 6.5 to 55.5 mg L − 1. These values were applied at the scale of the bay of Mont-Saint-Michel (France) to demonstrate that the filtration pressure of large populations of wild suspension-feeders should not be underestimated when the carrying capacity has to be assessed in the context of increasing bivalve cultures.

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Feeding mechanism of the polychaete Sabellaria alveolata revisited: reply to Riisgård &amp;amp;amp;amp;amp;amp;amp;amp; Nielsen (2006)

Cited by 6 publications

References 17 publications

Ultrastructure and Functional Morphology of the Appendages in the Reef-Building Sedentary Polychaete Sabellaria Alveolata (Annelida, Sedentaria, Sabellida)

Ultrastructure and Functional Morphology of the Appendages in the Reef-Building Sedentary Polychaete Sabellaria Alveolata (Annelida, Sedentaria, Sabellida)

Interplay between abiotic factors and species assemblages mediated by the ecosystem engineer Sabellaria alveolata (Annelida: Polychaeta)

Feeding response of the polychaete Sabellaria alveolata (Sabellariidae) to changes in seston concentration

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