Physiology of the digestive tract of the sedentary polychaete Terebellides stroemi

Michel, Catherine; Bhaud, Michel; Boumati, P.; Halpern, Sylvain

doi:10.1007/bf00393082

Cited by 16 publications

(7 citation statements)

References 14 publications

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“…The studied specimen of T. persiae spec. nov. shows the same pattern of digestive regionalization as previously observed by Michel et al (1984), Williams (1984) and Penry & Jumars (1990) in Mediterranean, NE and NW Atlantic specimens of T. stroemii. The same pattern was also found by Parapar & Hutchings (2015) when redescribing T. stroemii and by Parapar et al (in press) in a new species from NE Atlantic waters.…”

Section: Discussionsupporting

confidence: 87%

A new species of the genus Terebellides (Polychaeta, Trichobranchidae) from the Iranian coast

Parapar

Moreira

Gil

et al. 2016

Zootaxa

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Based on specimens collected during several sampling programmes along the Iranian coast, Persian Gulf, a new species of the genus Terebellides (Polychaeta, Trichobranchidae) is herein described as Terebellides persiae spec. nov. The new species is primarily characterised by the presence of a large dorsal thoracic hump in larger specimens and ciliated papillae on the branchial lamellae. The new species is compared with other taxa belonging to Terebellides described or reported with any of both characters. SEM and micro-CT have been used to study T. persiae spec. nov. and provide several new details on external characters and internal organs, respectively. A key for the identification of the species of Terebellides with dorsal hump is provided.

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Section: Discussionsupporting

confidence: 87%

A new species of the genus Terebellides (Polychaeta, Trichobranchidae) from the Iranian coast

Parapar

Moreira

Gil

et al. 2016

Zootaxa

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“…These trends were especially pronounced in the digestively active gut sections. Low lipase activity in deposit-feeding polychaetes has been suggested before based on tissue homogenates (Kay, 1974;Michel et al, 1984).…”

Section: R-l Flhmentioning

confidence: 84%

Digestive environments of benthic macroinvertebrate guts: Enzymes, surfactants and dissolved organic matter

Mayer¹,

Schick²,

Selfz³

et al. 1997

issn: 0022-2402

166

163

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Hydrolytic enzyme activity, surfactancy, and dissolved organic matter in the digestive lumens of 19 benthic echinoderm and polychaete species were examined, using consistent and quantifiable methods. Enzyme activities were compared with those of extracellular enzymes from ambient sediments. Enzyme activities ranged over five orders of magnitude, with averages decreasing in the order polychaetes > echinoderms > sediment. Highest activities in animals were usually associated with the fluid phase in midgut sections, with posteriorward decreases indicating little export to the external environment. At some phyletic levels, activity correlated inversely with animal size. Hydrolase patterns reflected food type; for example, high 1ipase:protease ratios in carnivores reflected esterified lipids in their diets. High surfactant activity was found in gut sections having high enzyme activity. Deposit feeders had the most intense surfactancy, including evidence for micelles. While enzymes reflected the biochemical nature of the digestible food substrate regardless of feeding mode (e.g., deposit vs. suspension feeder), surfactants reflected dilution of this digestible substrate with mineral grains. Dissolved organic matter levels were high, with amino acids reaching levels > 1 M and lipids commonly 1 g L-r. Among polychaete deposit-feeders, low molecular weight amino acids reflected the composition of the food substrate, but were present at much higher concentrations than could be explained by sediment present in the gut-suggesting longer residence times for fluid than for transiting sediment particles. Deposit feeder digestive fluids are better able to solubilize sedimentary food substrates than are sedimentary extracellular enzymes, owing to either more powerful solubilizing agents or to their deployment in freely diffusing, dissolved form. Gut environments may lead to chemical condensation as well as solubilization reactions.

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“…Spherocrystals are especially numerous in animals exposed to toxic metals (Dennai et al 1986;Michel 1988) and are thought to be involved in excretion or detoxification of metals (Michel et al 1984;Michel 1988;Saulnier-Michel et al 1990;Saulnier-Michel 1992;Jenkins et al 2002). As a resident of hydrothermal vents, A. rosacea is exposed to millimolar concentrations of metals such as copper, iron, and zinc (Elderfield and Schultz 1996); a mechanism for detoxification and clearance of metals seems expedient.…”

Section: Discussionmentioning

confidence: 98%

Functional morphology and feeding strategy of the hydrothermal-vent polychaete Archinome rosacea (family Archinomidae)

Ward¹,

Jenkins²,

Dover³

2003

Can. J. Zool.

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Polychaetes are a large component of deep-sea hydrothermal-vent invertebrate faunas, yet little is known about the trophic ecology of most species. In this study, the feeding mode of a common and widespread vent polychaete, Archinome rosacea (order Amphinomida), is investigated through morphological studies and gut-content analyses. The foregut of this polychaete is similar in structure to that of other shallow-water Amphinomida. Prey capture is facilitated by a ventral muscular eversible proboscis with two glandular lateral-lip structures. Extracellular digestion is suggested by packets of digestive enzymes observed to be discharged from the apical ends of the midgut epithelial cells into the lumen. Midgut tissues also contain inclusions resembling spherocrystals, possibly sites where toxic materials are sequestered. Gut-content analyses indicate a preference for mobile prey, including polychaetes and crustaceans. We propose that predation and scavenging are important trophic strategies for A. rosacea.Résumé : Les polychètes sont une composante importante de la faune des cheminées hydrothermales dans la zone profonde des océans et pourtant, on connaît peu de choses au sujet de l'écologie trophique de la plupart des espèces. Nous étudions ici le mode d'alimentation d'un polychète commun dans les cheminées hydrothermales, Archinome rosacea (ordre Amphinomida), par examen morphologique et par analyse des contenus stomacaux. La partie antérieure du tube digestif est de structure semblable à celle d'autres Amphinomida d'eaux peu profondes. La capture des proies est assurée par le proboscis ventral, musculeux, réversible, qui porte deux structures latérales glandulaires en forme de lèvres. La digestion semble extracellulaire, vu la présence de paquets d'enzymes digestives libérés dans la lumière aux extrémités apicales des cellules épithéliales de la partie médiane du tube digestif. Les tissus de cette partie du tube contiennent aussi des inclusions ressemblant à des cristaux sphériques qui servent peut-être à l'entreposage de matières toxiques. Les analyses de contenus stomacaux ont révélé une préférence pour les proies mobiles, notamment des polychètes et des crustacés. Il semble qu'A. rosacea soit à la fois prédatrice et détritivore, deux stratégies alimentaires importantes pour cette espèce.[Traduit par la Rédaction] Ward et al. 590

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Physiology of the digestive tract of the sedentary polychaete Terebellides stroemi

Cited by 16 publications

References 14 publications

A new species of the genus Terebellides (Polychaeta, Trichobranchidae) from the Iranian coast

A new species of the genus Terebellides (Polychaeta, Trichobranchidae) from the Iranian coast

Digestive environments of benthic macroinvertebrate guts: Enzymes, surfactants and dissolved organic matter

Functional morphology and feeding strategy of the hydrothermal-vent polychaete Archinome rosacea (family Archinomidae)

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