Distribution, population structure and life cycle of the Mediterranean endemic Laminaria rodriguezii (Laminariales, Phaeophyceae)
Résumé
Laminaria rodriguezii is a rare deep-water kelp species, endemic to the Mediterranean Sea, known in only 19 locations, 5 along the Eastern Provence and 14 in Corsica (French coasts). Populations are found at depths ranging from 48 to 100 m; the oldest record dates back to 1954. This study aims to better understand its distribution, biology, and ecology by analyzing recent data from in situ observations and sampling. In July 2019, a population at Magaud Bank (France) was studied at 75 m depth. A total of 154 individuals were collected in quadrats, showing an average density of 15.7 ± 2.2 individuals per m2 (mean ± SE). The population consists mostly of small blades, with 80% measuring < 40 cm in total length. The blades generally have a single lobe, corresponding to the year 2019, but sometimes 2 to 3 superimposed lobes, corresponding to the growth of the years 2018 and 2019 respectively. Lobe density ranged from 6 to 84 lobes per m2, and the dry mass (DM) varied from 24 to 1160 g DM m-2. A small percentage (17%) of individuals bore small, mostly released sori on the 2018 lobes, and some blades showed signs of herbivory (7%) and breakage (44%). In culture, we verified the typical heteromorphous haplodiplontic life cycle of Laminaria species, with microscopic dimorphic male and female gametophytes. In addition, we showed that vegetative sporophyte reproduction is possible from haptera and stolons. Except for 7 locations (in Corsica) that were not examined, all the French historical populations are still present, and we propose a Least Concern IUCN status for the species. Considering their resistance to the few disturbances likely to threaten the species (mainly fishing using tremail nets), proposals for conservation measures along the French coast are discussed.
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THIERRY , T., BLANFUNÉ, A., THOUROUDE, B., REYNES, L., BALLESTA, L., HOLON, F., DETER, J., BOUDOURESQUE, C.-F., VALENTIN, K.-U., WAGNER, A., & BARTSCH, I. (2025). Distribution, population structure and life cycle of the Mediterranean endemic Laminaria rodriguezii (Laminariales, Phaeophyceae). Mediterranean Marine Science, 26(4), 877–890. https://doi.org/10.12681/mms.42076
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Références
Andromède Océanologie, 2011. Étude et cartographie des biocénoses marines de la Réserve naturelle de Scandola, Corse. Andromède Océanologie, Montpellier, 136 pp.
Andromède Océanologie, 2020. Etat des eaux et des écosystèmes de la zone crépusculaire en Méditerranée française – Surveillance DCE et DCSMM. Contrat Andromède Océanologie & Agence de l’eau Rhône Méditerranée & Corse. Andromède Océanologie, Marseille. 202 pp.
Ballesteros, E., 2006. Mediterranean coralligenous assemblages: a synthesis of present knowledge. p. 123-195. In: Oceanography and marine biology: an annual review volume 44. Gibson, R. N., Atkinson, R. J. A., Gordon, J. D. M. (Eds.). CRC Press, Boca Raton.
Bartsch, I., 2018. Derivation of Clonal Stock Cultures and Hybridization of Kelps. p. 61-78. In: Protocols for Macroalgae Research. Charrier, B., Wichard, T., Reddy, C. R. K. (Eds.). CRC Press, Boca Raton.
Benhissoune, S., Boudouresque, C.-F., Perret-Boudouresque, M., Verlaque, M., 2002. A check-list of marine seaweeds of the Mediterranean and Atlantic coasts of Morocco. II. Phaeophyceae. Botanica marina, 45, 217-230.
Ben Maiz, N., Boudouresque, C.-F., Ouachi, F., 1987. Inventaire des algues et phanérogames marines benthiques de la Tunisie. Giornale botanico italiano, 121 (5-6) 259-304.
Blanfuné, A., Boudouresque, C.-F., Verlaque, M., Thibaut, T., 2016. The fate of Cystoseira crinita, a forest-forming Fucale (Phaeophyceae, Stramenopiles), in France (North Western Mediterranean Sea). Estuarine, Coastal and Shelf Science, 181, 196-208.
Blanfuné, A., Boudouresque, C.-F., Verlaque, M., Thibaut, T., 2025. Severe decline of Gongolaria barbata (Fucales) along most of the French Mediterranean coast. Scientific Reports, 15, 5701.
Bo, M., Bertolino, M., Borghini, M., Castellano, M., Covazzi Harriague, A. et al., 2011. Characteristics of the Mesophotic Megabenthic Assemblages of the Vercelli Seamount (North Tyrrhenian Sea). PLoS ONE 6, e16357.
Boisset, F., Ferrer-Gallego, P. P., Furnari, G., Cormaci, M., Dennetiere, B., 2016. Typification of the Mediterranean Endemic Deep-Water Macroalga Laminaria rodriguezii Bornet (Laminariaceae, Phaeophyceae). Cryptogamie, Algologie 37, 121-132.
Bornet, M.Ed., 1888. Note Sur Une Nouvelle Espèce De Laminaire (Laminaria rodriguezii) De La Méditerranée. Bulletin de la Société Botanique de France, 35, 361-366.
Boudouresque, C.-F., Perret-Boudouresque, M.M., 1987. A checklist of the benthic marine algae of Corsica. GIS Posidonie, Marseille, 121 pp.
Boudouresque C.-F., Perret-Boudouresque M., Blanfuné A., 2022. Diversity of marine and brackish macrophytes in the Port-Cros National Park (Provence, France, Mediterranean Sea): taxa and research effort over space and time. Diversity, 14 (329), 1-41.
Boudouresque, C.-F., Ballesteros, E., Ben Maiz, N., Boisset, F., Bouladier, E. et al., 1990. Livre rouge «Gérard Vuignier» des végétaux, peuplements et paysages marins menacés de Méditerranée. Programme des Nations Unies pour l’Environnement (UNEP), IUCN Publishers, Athens, 250 pp.
Carney, L.T., Bohonak, A. J., Edwards, M. S., Alberto, F., 2013. Genetic and experimental evidence for a mixed-age, mixed-origin bank of kelp microscopic stages in southern California. Ecology, 94, 1955-19654.
Cossu, A., Gazale, V., 1999. Nuove segnalazioni per la flora marina bentonica della Sardegna. Biologia Marina Mediterranea, 6 (1), 368-371.
Council of Europe, 1979. Convention on the Conservation of European Wildlife and Natural Habitats, Bern, 19.IX.1979. European Treaty Series, 104: 1-10 + Annexes.
Demes, K. W., Graham, M. H., 2011. Abiotic regulation of investment in sexual versus vegetative reproduction in the clonal kelp Laminaria sinclairii (laminariales, Phaeophyceae). Journal of phycology, 47(3), 463-470.
Deter, J., Juhel, J.-B. Boulanger, E., Guellati, N., Mauron, S. et al., 2020. Gombessa 5 cruise: CTD profiles in western Mediterranean, July 2019. SEANOE.
Ercegović, H., 1960. Limite inférieure des algues supérieures en Adriatique. Rapports et Procés-verbaux des Réunions de la CIESMM 15, 156-160.
Falconetti, C., 1980. Bionomie benthique des fonds situés à la limite du plateau continental du banc du Magaud (îles d’Hyères) et de la région de Calvi (Corse). Ph.D. Thesis, University of Nice, France, 287 pp.
Farriols, M.T., Joher, S., Ordines, F., Guijarro, B., Peteiro, C. et al., 2025. Recovery and expansion of rhodoliths beds and Laminaria rodriguezii forests after bottom trawl ban. Biodiversity and Conservation, 34 (3), 895-915.
Fourt, M., Goujard, A., 2012. Rapport final de la campagne MEDSEASCAN (Têtes des canyons méditérranéens continentaux) Novembre 2008 - Avril 2010. Partenariat Agence des aires marines protégées. GIS Posidonie, Marseille, 218pp.
Fredj, G., 1972. Compte rendu de plongée en SP 300 sur les fonds à Laminaria rodriguezii Bornet de la Pointe de Revellata (Corse). Bulletin de l’Institut océanographique de Monaco., 71, 1-42.
Ganteaume, A., Bonhomme, P., Ruitton, S., Verlaque, M., Boudouresque, C.-F., 2004. Etat des lieux et potentialités du milieu marin autour des îles Sanguinaires (Corse du Sud). Contract GIS Posidonie et Association des Amis du Parc de Corse. GIS Posidonie, 60 pp.
Gautier, Y., Picard, J., 1957. Bionomie du banc de Magaud (Est des Iles d’Hyéres). Recueil des travaux de la station marine d’Endoume, 12 (21), 28-40.
Giaccone, G., 1969. Note sistematiche ed osservazioni fitosociologiche sulle Laminariales del Mediterraneo occidentale. Plant Biosystem 103, 457-474.
Guiry, M.D., Guiry, G.M., 2025. AlgaeBase. World-wide electronic publication, University of Galway. https://www.algaebase. org; (Accessed 5 March 2025).
Harmelin, J.G., Zibrowius, H., Arnoux, A., Romana, L., 1991. Evaluation de l’état des peuplements benthiques du hautfond St Julien (Région de St Tropez). Campagnes Cyana de mars et Juin 1990. Ifremer, Paris, 41pp.
Huvé, H., 1955. Présence de Laminaria rodriguezii Bornet sur les côtes françaises de la Méditerranée. Recueil des travaux de la station marine d’Endoume, 15, 73-91.
IUCN, 2012. IUCN Red List Categories and Criteria: Version 3.1. (IUCN, Gland, Switzerland and Cambridge).
IUCN, 2025. The IUCN Red List of Threatened Species. Version 2025-1. https://www.iucnredlist.org (Accessed 21 March 2025).
Joher, S., Ballesteros, E., Rodrigues-Prieto, C., 2015. Contribution to the study of deep coastal detritic bottoms: the algal communities of the continental shelf off the Balearic Islands, Western Mediterranean. Meditteranean Marine Science, 16 (3), 573-590.
Joher, S., Ballesteros, E., Cebrian, E., Sánchez, N., Rodríguez-Prieto, C., 2012. Deep-water macroalgal-dominated coastal detritic assemblages on the continental shelf off Mallorca and Menorca (Balearic Islands, Western Mediterranean). Botanica Marina 55, 485-497.
Küpper, F. C., Tsiamis, K., Johansson, N. R., Peters, A. F., Salomidi, M. et al., 2019. New records of the rare deep-water alga Sebdenia monnardiana (Rhodophyta) and the alien Dictyota cyanoloma (Phaeophyceae) and the unresolved case of deep-water kelp in the Ionian and Aegean Seas (Greece). Botanica Marina, 62, 577-586.
Linares, C., Vidal, M., Canals, M., Kersting, D. K., Amblas, D., Aspillaga, E., et al., 2015. Persistent natural acidification drives major distribution shifts in marine benthic ecosystems. Proceedings of the Royal Society B: Biological Sciences, 282, 20150587.
Martins, N., Pearson, G. A., Gouveia, L., Tavares, A. I., Serrão, E. A., et al., 2019. Hybrid vigour for thermal tolerance in hybrids between the allopatric kelps Laminaria digitata and L. pallida (Laminariales, Phaeophyceae) with contrasting thermal affinities. European Journal of Phycology, 54, 548-561.
Molinier, R., 1956. Les fonds à laminaires du Grand Banc de Centuri (Cap Corse). Comptes Rendus de l’Académie des Sciences, 342, 939-941.
Pageault, L., 2020. Growth and photosynthesis of the endemic Mediterranean deep-water kelp Laminaria rodriguezii along temperature and irradiance gradient. MSc Thesis. University of Aix-Marseille, France, 47 pp.
Pedel, L., Fabri, M.C., 2011. Description et cartographie des biocénoses benthiques rencontrées au cours de la campagne MEDSEACAN (Aamp/Comex). Convention MEDDTL – Ifremer pour l’Evaluation Initale de DCSMM. Ifremer, Paris, 109 pp.
Pérès, J.-M., Picard, J., 1964. Nouveau manuel de bionomie benthique de la mer Méditerranée. Recueil des Travaux de la Station Marine d’Endoume, 31 (47), 3-137.
Perret-Boudouresque, M.M., Seridi, H., 1989. Inventaire des algues marines benthiques d’Algerie. Gis Posidonie, Marseille, 117 pp.
Provasoli, L., 1968. Media and prospects for the cultivation of marine algae. p. 63-75. In: Cultures and Collections of Algae. Watanabe, A., Hattori, A., (Eds.). Proceedings of the US Japan Conference, Hakone 1966. Japanese Society of Plant Physiology, Tokyo.
Reynès, L., Thibaut, T., Mauger, S., Blanfuné, A., Holon, F., et al., 2021. Genomic signatures of clonality in the deep-water kelp Laminaria rodriguezii. Molecular Ecology 30, 1806-1822.
Ribera, M.A., Gomez Garreta, A., Gallardo, T., Cormaci, M., Furnari, G. et al., 1992. Check-list of Mediterranean Seaweeds. I. Fucophyceae (Warming, 1884). Botanica Marina, 35, 109-130.
Safege Cetiis, 2011. Étude préalable à la mise en place de l’observatoire marin du littoral des des Maures le long des côtes de Ramatuelle. Rapport d’étude. Contrat Safege Cetiis - SIVOM du Littoral des Maures. 170 pp.
Schoenrock, K.M., McHugh, T.A., Krueger-Hadfield, S., 2021. Revisiting the ‘Bank of microscopic forms’ in macroalgal dominated ecosystems. Journal of Phycology, 57, 14-29.
Shea, R., Chopin, T. 2007. Effects of germanium dioxide, an inhibitor of diatom growth, on the microscopic laboratory cultivation stage of the kelp, Laminaria saccharina. Journal of Applied Phycology, 19, 27-32.
Smale, D.A., Burrows, M.T., Moore, P., O’Connor, N., Hawkins, S.J., 2013. Threats and knowledge gaps for ecosystem services provided by kelp forests: a northeast Atlantic perspective. Ecology and Evolution, 3, 4016-4038.
Steneck, R.S., Graham, M.H., Bourque, B.J., Corbett, D., Erlandson, J.M. et al., 2002. Kelp forest ecosystems: biodiversity, stability, resilience and future. Environmental Conservation, 29, 436-459.
Taşkin, E., Öztürk, M., Kurt, O., Öztürk, M. 2008. The checklist of the marine flora of Turkey. Manisa, Turkey, 87 pp.
Tatewaki, M., 1966. Formation of a crustaceous sporophyte with unilocular sporangia in Scytosiphon lomentaria. Phycologia, 6, 62-66.
tom Dieck, I., 1992. North Pacific and North Atlantic digitate Laminaria species (Phaeophyta): hybridization experiments and temperature responses. Phycologia, 31 (2), 147-163.
tom Dieck, I., 1993. Temperature tolerance and survival in darkness of kelp gametophytes (Laminariales, Phaeophyta): Ecological and biogeographical implications. Marine Ecology Progress Series, 100, 253-264.
tom Dieck, I., de Oliveira, E. C., 1993. The section Digitatae of the genus Laminaria (Phaeophyta) in the northern and southern Atlantic: crossing experiments and temperature responses. Marine Biology, 115, 151-160.
UNEP/MAP-SPA/RAC, 2018. SAP/RAC: SPA-BD Protocol - Annex II: List of endangered or threatened species. SPA/ RAC publ., Tunis, Tunisia.
Žuljević, A., Peters, A.F., Nikolić, V., Antolić, B., Despalatović, M. et al., 2016. The Mediterranean deep-water kelp Laminaria rodriguezii is an endangered species in the Adriatic Sea. Marine Biology, 163 (69), 1-12.
