Search

International audience; Rising greenhouse gas emissions are causing increasing worldwide impacts and changes on climate patterns, sea level, food production, human lives and livelihoods. Maintaining or improving the ability of coastal aquatic ecosystems and oceans to remove CO2 from the atmosphere is a crucial aspect for climate mitigation. The vegetated coastal ecosystems are able to catch and to sequestrate carbon, the so-called Blue Carbon. These ecosystems are key exchange zones that mediate the biogeochemical cycles across the continent, the ocean and the atmosphere. Given the importance of these ecosystems in biogeochemical cycles and their sensitivity to natural and anthropogenic pressures, the carbon cycle within and between compartments (e.g. pelagos, benthos…) and across the interfaces (e.g. atmosphere, ocean…) need to be addressed. On a regional scale, in the extended urban area of La Rochelle located on the French Atlantic coast (La Rochelle metropolitan area), lack in situ measurements within the wetlands and littoral zone make very uncertain their role as a sink or a source of CO2 to the atmosphere. We will first present a vast research project “La Rochelle Territoire Zéro Carbone” project (https://www.agglo-larochelle.fr/projet-de-territoire/territoire-zero-carbone), that target the ambition of carbon neutrality in La Rochelle metropolitan area by 2040 through a holistic approach (from measuring CO2 to raising people's awareness and assessing the impact of exogenous natural factors). Second, we will present some first results on the Blue Carbon dynamics within the freshwater and salt marshes, and seagrasses.

Family Telothelepodidae Nogueira, Fitzhugh & Hutchings, 2013 Figs 3���4 Diagnosis (after Nogueira et al. 2018; Hutchings et al. 2021a, most important diagnostic characters highlighted in bold) Transverse prostomium attached to dorsal surface of upper lip; basal part as thick crest, eyespots frequently present in one pair of dorso-lateral clusters, each with several rows of eyespots (Fig. 3A); distal part at base of upper lip, frequently with low or erect mid-dorsal tongue-like process, fused to upper lip at variable degrees, with free distal lobe(s), or free from the base. Buccal tentacles of two types, short ones thin, uniformly cylindrical, long tentacles stouter and expanded at tips, slightly spatulate (Figs 3A���B, F, 4A). Peristomium forming lips and continuing dorsally at least for short extension, with dorso-lateral nuchal organs at margin with prostomium; lips expanded, upper lip distinctly elongate and narrow, undulated to convoluted; swollen lower lip extending across ventrum, cushion-like or segment-like, frequently deeply grooved (Figs 3A���B, 4A). Either SG I or SG II reduced, not forming complete ring in many species. Anterior segments glandular ventrally, smooth, discrete shields absent and frequently with glandular regions poorly developed in comparison to other families of Terebellidae s.l.; mid-ventral groove frequently extending from anterior segments. Two pairs of cirriform branchiae on SG II���III, each pair with simple thin, curled and relatively short filaments progressively tapering to tips (Figs 3A, 4A), originating from raised crests on anterior margins of SG II and III, or from specialised, apparently glandular, dorso-lateral cushion-like pads occupying from anterior margins to level of posterior bases of notopodia of those segments. Notopodia beginning from SG II or III, usually SG III, extending for at least 15 segments; notopodia as short cones, notochaetae originating from central core on top, distal lobes absent; notochaetae winged, sometimes with bulbous head and alimbate tips (bayonet-like chaetae), at least in anterior row of anterior thoracic segments. Neuropodia beginning posteriorly to notopodia, usually around SG VIII���XII; neuropodia in conjunction with notopodia as sessile tori, as distinctly low pinnules after notopodia terminate; neurochaetae in single row, as avicular uncini about as long as high, with short triangular heel directed posteriorly, wide and slightly curved base, and dorsal button near midlength of uncini, but closer to anterior margin (Fig. 4E). Nephridial and genital papillae, if conspicuous, on SG V���VII, posterior to bases of notopodia. Remarks This recent family was described by Nogueira et al. (2013) after conducting a comprehensive phylogenetic analysis. The members of this family were previously considered as Thelepodidae but differ in having a narrow and elongate upper lip, poorly developed neuropodia and anterior segments less glandular ventrally than in other thelepodids. In European waters, this family is represented by a single species, Parathelepus collaris (Figs 3A���B, 4A, E; Table 1), characterised by an expanded, tongue-like upper lip, by neuropodia poorly developed and beginning from SG XI., Published as part of Lavesque, Nicolas, Hutchings, Pat, Londo��o-Mesa, Mario H., Nogueira, Jo��o M. M., Daffe, Guillemine, Nygren, Arne, Blanchet, Hugues, Bonif��cio, Paulo, Broudin, Caroline, Dauvin, Jean-Claude, Droual, Gabin, Gouillieux, Benoit, Grall, Jacques, Guyonnet, Benjamin, Houbin, C��line, Humbert, Suzie, Janson, Anne-Laure, Jourde, J��r��me, Labrune, C��line, Lamarque, Bastien, Latry, Lise, Garrec, Vincent Le, Pelaprat, Corine, Pezy, Jean-Philippe, Sauriau, Pierre-Guy & Montaudouin, Xavier De, 2021, The " Spaghetti Project ": the final identification guide to European Terebellidae (sensu lato) (Annelida, Terebelliformia), pp. 108-156 in European Journal of Taxonomy 782 (1) on page 124, DOI: 10.5852/ejt.2021.782.1593, http://zenodo.org/record/5781605, {"references":["Nogueira J. M. M., Fitzhugh K. & Hutchings P. 2013. The continuing challenge of phylogenetic relationships in Terebelliformia (Annelida: Polychaeta). Invertebrate Systematics 27: 186 - 238. https: // doi. org / 10.1071 / IS 12062.","Nogueira J. M. M., Carrerette O., Hutchings P. & Fitzhugh K. 2018. Systematic review of the species of the family Telothelepodidae Nogueira, Fitzhugh & Hutchings, 2013 (Annelida, Terebelliformia), with descriptions of three new species. Marine Biology Research 14: 217 - 257. https: // doi. org / 10.1080 / 17451000.2017.1401729.","Hutchings P., Nogueira J. M. N. & Carrerette O. 2021 a. Terebellidae Johnston, 1846. In: Schmidt- Rhaesa A. Hr., Beutel R. G., Glaubrecht M., Kristensen N. P., Prendini L., Purschke G., Richter S., Westheide, W. & Leschen R. Z. E. (eds) Handbook of Zoology. A Natural History of the Phyla of the Animal Kingdom: 1 - 64. Walter de Gruyter & Co, Berlin."]}

Family Thelepodidae Hessle, 1917 Figs 1F, 3���4 Diagnosis (after Hutchings et al. 2021a, most important diagnostic characters highlighted in bold) Transverse prostomium attached to dorsal surface of upper lip; basal part as thick crest, eyespots frequently present, in short lateral rows, or extending transversely across basal part of prostomium, usually progressively more spaced towards dorsal mid-line, with mid-dorsal gap or not; distal part of base of upper lip short, from nearly indistinct to shelf-like. Buccal tentacles all uniformly thin and cylindrical, to slightly spatulate distally (Figs 3D, F, 4B). Peristomium forming lips, sometimes also complete annulation, with dorso-lateral nuchal organs as ciliated grooves; lips expanded, relatively short upper lip, hood-like, about as long as wide; swollen, button-like, mid-ventral lower lip (Figs 3D, F, 4B���C). Segment 1 usually present all around, frequently with ventral lobe marginal to mouth (Figs 3D, F, 4B���C); SG II typically with anterior margin as protruding crest, at least ventrally (Figs 3D���E, 4B���C); lobes on following anterior segments sometimes present. Anterior segments highly glandular ventrally, smooth to highly corrugated between neuropodia within pairs, discrete shields absent (Figs 3D F, 4B); mid-ventral groove frequently extending from anterior segments with notopodia. Two to three pairs of branchiae, on SG II���III or II���IV, each pair with simple thin, curled and relatively short filaments progressively tapering to tips (Figs 3C, E, 4C), leaving mid-dorsal gap or not between filaments within pairs; branchial filaments originating directly from the body wall or from specialised dorsolateral cushion-like pads. Notopodia beginning on SG II���III, usually extending to mid-body, at least, sometimes until near posterior end; cylindrical to rectangular, distally bilobed notopodia, notochaetae originating between lobes; most taxa with winged notochaetae only, with wings of variable width (Fig. 4D), distally serrated notochaetae sometimes also present; bayonet-like and pinnate chaetae both absent. Neuropodia beginning posteriorly to notopodia, on SG IV���VI, typically on SG V; neuropodia in conjunction with notopodia as fleshy, swollen ridges, as raised rectangular to cylindrical pinnules after notopodia terminate; neurochaetae as avicular uncini frequently longer than high, with short triangular heel directed posteriorly, distinctly curved and wide base, and dorsal button near anterior margin of uncini, or within anterior third of distance between anterior margin of uncini and base of main fang (Fig. 4F). Nephridial and genital papillae usually present, on SG IV���VII, posterior to bases of notopodia or between parapodial lobes (Fig. 3C). Remarks A comprehensive phylogenetic analysis conducted by Nogueira et al. (2013) permitted the elevation of the previous Thelepodinae subfamily to Thelepodidae family level, as they represented a separate clade from other terebellids. This family is represented in European waters by three genera Euthelepus McIntosh, 1885 (a single species), Streblosoma Sars, 1872 (seven species) and Thelepus Leuckart, 1849 (nine species) (Table 1). Among these species, Thelepus japonicus Marenzeller, 1884, native from Japan, is considered as a non-indigeneous species in French waters, probably introduced with oyster transfers (Lavesque et al. 2020a) (Fig. 3C). Main morphological characters of European species BRANCHIAE. Both in Thelepus and Streblosoma genera, the number of pairs of branchiae varies between two (e.g., Streblosoma lindsayae or Thelepus nucleolata) and three (e.g., Streblosoma hutchingsae or Thelepus setosus). Branchiae in Thelepodidae are always cirriform (Figs 3C, E, 4C) but the number of branchial filaments varies among the species with for example 5���10 filaments on the second and third pairs of branchiae for Streblosoma cabiochi (Fig. 3E) and only three or less filaments for Streblosoma intestinale. Finally, the size of the medial dorsal gap separating the pairs of branchiae is a good diagnostic character. This gap is for example inconspicuous for T. parapari and wide for Thelepus cincinnatus (Nogueira 2019). PRESENCE OF EYESPOTS. The eyespots are very useful in differentiating species of Streblosoma and Thelepus for which they can be absent (e.g., Thelepus davehalli or Streblosoma hutchingsae) or present (e.g.m Thelepus corsicanus or Streblosoma nogueirai). Also, the arrangement of the eyespots, if in a continuous line, or leaving a medial gap is of taxonomic importance (Nogueira et al. 2010). START AND EXTENSION OF NOTOPODIA. The segment with the first appearance of notopodia permits the discrimination between the genus Streblosoma, for which notopodia begin on the second segment, and Euthelepus and Thelepus for which it begins on the third segment. These notopodia also extend for a variable number of segments, sometimes present only on the anterior half of the body (e.g., T. corsicanus) or present until the end of the body (T. japonicus). SHAPE OF NEUROPODIA AND UNCINI. In most of the species, the uncini start on SGV which could correspond to CH 3 (as in Thelepus) or CH 4 (as in Streblosoma). The uncini are arranged habitually in single rows but some have uncini forming loops (C-shaped arrangement) from mid thorax onwards. This last character is found for example in S. nogueirai. Between species, the uncini differ in the development of the prow (e.g., well developed in T. triserialis), the shape of the base (e.g., strongly curved in S. cabiochi), the position of the dorsal button (e.g., far from anterior margin in S. bairdi or in a terminal position for T. japonicus (Fig. 1F) and number of secondary of teeth. CREST AND LATERAL LOBES. The presence of lateral lobes on SG II���IV allows the separation of the genus Euthelepus from other genera of the family. The presence of lateral crests on SG II (= thick anterior margin) is an important character within the Streblosoma genus. For example, S. cabiochi has a very low crest on SG II (Fig. 4C) while S. bairdi has a protruding crest (Nogueira 2019). Key to European species of Thelopodidae (after Lavesque et al. 2020a ) 1. Notopodia from SG II (i.e., first branchiferous segment), start of uncini from CH 4.............................................................................................................................................................2 (Streblosoma) ��� Notopodia from SG III (i.e., second branchiferous segment), start of uncini from CH 3.................. 8 2. Two pairs of branchiae................................................................................................................................................................ Streblosoma lindsayae Lavesque, Londo��o-Mesa, Daffe & Hutchings, 2020 ��� Three pairs of branchiae.................................................................................................................... 3 3. Uncini arranged in C-shaped loops from mid thorax....................................................................... 4 ��� Uncini always in straight rows......................................................................................................... 6 4. Notopodia not extending to posterior body...................................................................................... 5 ��� Notopodia until posterior body................. Streblosoma pseudocomatus Lezzi & Giangrande, 2019 5. Eyespots absent.............................................. Streblosoma hutchingsae Lezzi & Giangrande, 2019 ��� Eyespots present................................................. Streblosoma nogueirai Lezzi & Giangrande, 2019 6- Branchiae on SG III and SG IV with 3 or less filaments on each side.......................................................................................................................... Streblosoma intestinale M. Sars in G.O. Sars, 1872 ��� Branchiae on SG III and SG IV with 5���10 filaments on each side.................................................. 7 7. Absence of prostomial process, presence of lateral crest on SG II, absence of branchial cushion............................................. Streblosoma cabiochi Lavesque, Londo��o-Mesa, Daffe & Hutchings, 2020 ��� Presence of prostomial process, absence of lateral crest on SG II, presence of branchial cushion................................................................................... Streblosoma bairdi (Malmgren, 1866) 8. Lateral lobes on SG II���IV................................................. Euthelepus setubalensis McIntosh, 1885 ��� Lateral lobes on SG I only.............................................................................................. 9 (Thelepus) 9. Two pairs of branchiae.................................................................................................................... 10 ��� Three pairs of branchiae................................................................................................................. 15 10. Uncini in a single row throughout...................................................................................................11 ��� Uncini in loops from SG XIV.............................................. Thelepus nucleolata (Clapar��de, 1870) 11. Notopodia present on 50���66% of body length............................................................................... 12 ��� Notopodia present on at least 90% of body length......................................................................... 13 12. Eyespots absent................................................................................ Thelepus davehalli Jirkov, 2018 ��� Eyespots present.............. Thelepus corsicanus Lavesque, Londo��o-Mesa, Daffe & Hutchings, 2020 13. Uncini of CH 1 with one tooth above main fang............................................................................ 14 ��� Uncini of CH 1 with two teeth above main fang............................. Thelepus parapari Jirkov, 2018 14. Eyespots present................................................................. Thelepus cincinnatus (Fabricius, 1780) ��� Eyespots absent................................................................................. Thelepus marthae Jirkov, 2018 15. Prow of uncini well developed; notch between the prow and dorsal button of the uncini well marked......................................................................................... Thelepus triserialis (Grube, 1855) ��� Prow of uncini poorly developed; notch between the prow and dorsal button of the uncini poorly marked............................................................................................................................................ 16 16. Notopodia present on about 60% of the body length............. Thelepus setosus (Quatrefages, 1866) ��� Notopodia present until end of the body length.................... Thelepus japonicus Marenzeller, 1884, Published as part of Lavesque, Nicolas, Hutchings, Pat, Londo��o-Mesa, Mario H., Nogueira, Jo��o M. M., Daffe, Guillemine, Nygren, Arne, Blanchet, Hugues, Bonif��cio, Paulo, Broudin, Caroline, Dauvin, Jean-Claude, Droual, Gabin, Gouillieux, Benoit, Grall, Jacques, Guyonnet, Benjamin, Houbin, C��line, Humbert, Suzie, Janson, Anne-Laure, Jourde, J��r��me, Labrune, C��line, Lamarque, Bastien, Latry, Lise, Garrec, Vincent Le, Pelaprat, Corine, Pezy, Jean-Philippe, Sauriau, Pierre-Guy & Montaudouin, Xavier De, 2021, The " Spaghetti Project ": the final identification guide to European Terebellidae (sensu lato) (Annelida, Terebelliformia), pp. 108-156 in European Journal of Taxonomy 782 (1) on pages 124-129, DOI: 10.5852/ejt.2021.782.1593, http://zenodo.org/record/5781605, {"references":["Hessle C. 1917. Zur Kenntnis der terebellomorphen Polychaeten. Zoologiska bidrag fran Uppsala 5: 39 - 258. Available from https: // www. biodiversitylibrary. org / page / 38891407 [accessed 8 Nov. 2021].","Hutchings P., Nogueira J. M. N. & Carrerette O. 2021 a. Terebellidae Johnston, 1846. In: Schmidt- Rhaesa A. Hr., Beutel R. G., Glaubrecht M., Kristensen N. P., Prendini L., Purschke G., Richter S., Westheide, W. & Leschen R. Z. E. (eds) Handbook of Zoology. A Natural History of the Phyla of the Animal Kingdom: 1 - 64. Walter de Gruyter & Co, Berlin.","Nogueira J. M. M., Fitzhugh K. & Hutchings P. 2013. The continuing challenge of phylogenetic relationships in Terebelliformia (Annelida: Polychaeta). Invertebrate Systematics 27: 186 - 238. https: // doi. org / 10.1071 / IS 12062.","McIntosh W. C. 1885. Report on the Annelida Polychaeta collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology 12: 1 - 554. Available from https: // www. biodiversitylibrary. org / page / 50688432 [accessed 8 Nov. 2021].","Sars G. O. 1872. Diagnoser af nye Annelider fra Christianiaforden, efter Professor M. Sar's efterladte Manuskripter. Forhandlinger i Videnskabs-Selskabet i Christiania 1871: 406 - 417. Available from https: // biodiversitylibrary. org / page / 44067540 [accessed 8 Nov. 2021]","Leuckart R. 1849. Zur Kenntnis der Fauna von Island. Archiv fur Naturgeschichte 15 (1): 149 - 208.","Marenzeller E. 1884. Sudjapanische Anneliden. II. Ampharetea, Terebellacea, Sabellacea, Serpulacea. Denkschriften der Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe 49 (2): 197 - 224.","Lavesque N., Londono-Mesa M. H., Daffe G. & Hutchings P. 2020 a. A revision of the French Telothelepodidae and Thelepodidae (Annelida, Terebelliformia), with descriptions of three species and first European record of a non-indigenous species. Zootaxa 4810 (2): 305 - 327. https: // doi. org / 10.11646 / zootaxa. 4810.2.4","Nogueira J. M. M. 2019. Redescriptions of Streblosoma bairdi (Malmgren, 1866) and Thelepus cincinnatus (Fabricius, 1780), based on types and material from type localities. Zootaxa 4544 (3): 419 - 428. https: // doi. org / 10.11646 / zootaxa. 4544.3.7","Nogueira J. M. M., Hutchings P. & Fukuda M. V. 2010. Morphology of terebelliform polychaetes (Annelida: Polychaeta: Terebelliformia), with a focus on Terebellidae. Zootaxa 2460 (1): 1 - 185. https: // doi. org / 10.11646 / zootaxa. 2460.1.1","Lezzi M. & Giangrande A. 2019. New species of Streblosoma (Thelepodidae, Annelida) from the Mediterranean Sea: S. pseudocomatus sp. nov., S. nogueirai sp. nov. and S. hutchingsae sp. nov. Journal of Natural History 52 (43 - 44): 2857 - 2873. https: // doi. org / 10.1080 / 00222933.2018.1556357","Malmgren A. J. 1866. Nordiska Hafs-Annulater. Ofversigt af Kongliga Vetenskaps-Akademiens Forhandlingar 22: 355 - 410. Available from https: // www. biodiversitylibrary. org / part / 244483 [accessed 8 Nov. 2021].","Claparede E. 1870. Les annelides chetopodes du Golfe de Naples. Supplement. Memoires de la Societe de Physique et d'Histoire naturelle de Geneve 20 (2): 365 - 542. https: // doi. org / 10.5962 / bhl. title. 2142","Fabricius O. 1780. Fauna Groenlandica, systematice sistens, Animalia Groenlandiae occidentalis hactenus indagata, quoad nomen specificum, triviale, vernaculumque synonyma auctorum plurium, descriptionem, locum, victum, generationem, mores, usum, capturamque singuli prout detegendi occasio fuit, maximaque parte secundum proprias observations. Impensis Ioannis Gottlob Rothe, Copenhagen et Leipzig [Hafniae et Lipsiae]. https: // doi. org / 10.5962 / bhl. title. 13489","Grube A. E. 1855. Beschreibungen neuer oder wenig bekannter Anneliden. Archiv fur Naturgeschichte 21 (1): 81 - 136. Available from https: // doi. org / 10.5962 / bhl. part. 13989 [accessed 8 Nov. 2021].","Quatrefages A. de. 1866. Note sur la Classification des Annelides. Annales des Sciences Naturelles 5: 253 - 296."]}

L’objet de ce document est d’exposer la réalisation du suivi et de faire état des résultats du contrôle de surveillance DCE 2020 invertébrés benthiques de cette masse d’eau de transition

L’objet de ce document est d’exposer la bonne réalisation des suivis stationnels des invertébrés benthiques de substrats meubles subtidaux et intertidaux réalisé en avril 2018 conformément au protocole DCE de 2014 dans le cadre de la DCSMM Benthos Loire- Bretagne. Les évaluations de statut écologique issus du paramètre de qualité « invertébrés benthiques de substrats meubles » sont provisoires et devront être corrigées par les évaluations réalisées à l’échelle e la façade atlantique par la coordination Ifremer.

L’objet de ce document est d’exposer la réalisation du suivi 2017 invertébrés benthiques de ces masses d’eau de transition et d’en exposer les résultats mais sans proposer d’évaluation du statut écologique.

L’objet de ce document est d’exposer les résultats des suivis stationnels des invertébrés benthiques de substrats meubles subtidaux et intertidaux réalisé en avril 2017 conformément au protocoles DCE de 2014 (Garcia et al., 2014) sur : - la station subtidale Malconche, - la station subtidale d’appui Boyardville, et - les deux stations intertidales Bellevue et Les Doux

L’objet de ce document est d’exposer la bonne réalisation des suivis stationnels des invertébrés benthiques de substrats meubles subtidaux et intertidaux réalisé en avril 2016 conformément au protocoles DCE de 2014 (Garcia et al., 2014) sur : - la station subtidale Malconche de la masse d’eau côtière « Côte Nord-Est île d’Oléron ».

L’objet de ce document est d’exposer la bonne réalisation des suivis stationnels des invertébrés benthiques de substrats meubles subtidaux et intertidaux réalisé en avril 2016 conformément au protocoles DCE de 2014 (Garcia et al., 2014) sur : - la station subtidale d’appui Boyardville suivie annuellement et - les deux stations intertidales Bellevue et Les Doux.