Marc Verlaque

Marc Verlaque
Aix-Marseille Université | AMU · Institut Méditerranéen d'Océanographie (UMR_D 235 MIO)

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91
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Introduction
Skills and Expertise

Publications

Publications (91)
Article
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Conceived as a baseline for the management and conservation of the marine protected area of the French Southern Territories (réserve naturelle nationale des Terres australes françaises), the checklist of marine macroalgae of the Kerguelen Islands was updated based on an extensive review of the literature and scientific databases, from the first rep...
Article
Full-text available
Good datasets of geo-referenced records of alien species are a prerequisite for assessing the spatio-temporal dynamics of biological invasions, their invasive potential, and the magnitude of their impacts. However, with the exception of first records on a country level or wider regions, observations of species presence tend to remain unpublished, b...
Article
Full-text available
Good datasets of geo-referenced records of alien species are a prerequisite for assessing the spatio-temporal dynamics of biological invasions, their invasive potential, and the magnitude of their impacts. However, with the exception of first records on a country level or wider regions, observations of species presence tend to remain unpublished, b...
Article
The marine macroflora of the ports of Le Havre and Antifer have been studied by citizen scientists since the late 1970s. In addition to analysis of the previous results, the field study was extended from 2010 to 2018. A total of 97 and 62 macroalgae were identified, respectively, including 14 NIS (non-indigenous species), the latter number being ce...
Chapter
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Should be cited as : BLANFUNÉ A., BOUDOURESQUE C.F., THIBAUT T., VERLAQUE M., 2016. The sea level rise and the collapse of a Mediterranean ecosystem, the Lithophyllum byssoides algal rim. In : The Mediterranean region under climate change. A scientific update. Thiébault S., Moatti J.P. (eds.), AllEnvi, IRD éditions publisher, Marseille : 285-289.
Article
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On the basis of bibliographical, morphological and molecular studies (SSU rDNA), the reinstatement of species rank for Chaetomorpha stricta Schiffner, a poorly known Mediterranean endemic species described in the early 20th century, is proposed. Previously reduced to a posterior heterotypic synonym of C. linum (O.F. Müller) Kützing, C. stricta clea...
Article
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Nine species of the genus Sargassum (Phaeophyceae; kingdom Stramenopiles) are currently accepted in the Mediterranean Sea: S. acinarium, S. desfontainesii, S. flavifolium, S. furcatum, S. hornschuchii, S. muticum, S. ramentaceum, S. trichocarpum and S. vulgare. Sargassum desfontainesii and S. furcatum, are Atlantico-Mediterranean species. Sargassum...
Conference Paper
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The completion of the first evaluation cycle of the Marine Strategy Framework Directive has led to an update of the national non-indigenous species lists. Since 2016, 19 new in-troductions and six range expansions have been reported along the French coasts. MSFD monitoring and surveillance programmes are being defined and will prioritise hot-spots...
Article
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In this study we present a list of invasive/potential invasive alien species in the East and South European Network for Invasive Alien Species (ESENIAS) countries with marine borders. The species were classified according to the existing literature and experts’ judgment, as established, casual, invasive and expected. Finally, factsheets were compil...
Article
The meticulous revision by taxonomic experts of established alien species in the Mediterranean resulted in a major revision of the list proposed by Galil et al. (2016), with 72 species to be excluded (35 species categorised as non-established and 37 as not true aliens), and 71 species added to the list. Consequently, by year 2016 the total number o...
Article
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The marine macroflora introduced into Lebanon was studied through an analysis of historical data and field studies carried out since 1991. A total of 29 introduced species have been listed: 3 Chromobionta, 13 Rhodobionta, 12 Chlorobionta and 1 Streptobionta. Among them, Caulerpa taxifolia var. distichophylla, Spatoglossum variabile and Womersleyell...
Article
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A survey of the species of Cystoseira (Fucales, Phaeophyceae, Ochrophyta) of Tunisia highlighted six Mediterranean endemic taxa rare or new for this country: C. barbata f. aurantia, C. brachycarpa var. claudiae, C. compressa subsp. pustulata, C. foeniculacea f. dubia, C. hyblaea and C. spinosa var. tenuior. The discovery and the study of these spec...
Article
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Over the past 15 years, populations of two invasive or potentially invasive alien seaweeds have been studied by means of both quantitative and qualitative methods in the Mar Piccolo basin in Taranto (Southern Italy, Mediterranean Sea). The dynamics of the cold-temperate brown seaweed Undaria pinnatifida (Alariaceae, Laminariales) showed a boom-and-...
Article
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The French Riviera is among the Mediterranean areas that have been subject to the most long-lasting anthropogenic influences with severe impact on the marine environment. Fucales are long-lived, habitat forming brown algae that constitute a good model for studying human impact on species diversity. We gathered all historical data (literature and he...
Poster
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En Mer Méditerranée, le coralligène et les herbiers de Posidonies, qui sont de loin les plus étudiés, sont les habitats les plus importants du point de vue biodiversité côtière. Ils sont le milieu principal produisant complexité structurelle et biodiversité. Les récifs coralligènes produisent des biens (ressources alimentaires et matière première,...
Poster
Full-text available
The coralligenous is a typical Mediterranean marine habitat and hosts the highest concentration of biodiversity of this sea. Paradoxically, unlike Posidonia meadows, it is poorly studied. Like the famous tropical coral reefs, it is a complex biogenic habitat, based on encrusting red algae (numerous metazoan phyla also participate to bio-constructio...
Article
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On the basis of literature data and new morphological and ecological studies, the reinstatement of species rank for the Black Sea endemic species Cystoseira bosphorica is proposed. Previously reduced to a simple form of the Mediterranean endemic species C. crinita, this member of the caespitose Cystoseira group without spinose-like appendages clear...
Conference Paper
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Les campagnes d’exploration MedSeaCan et CorSeaCan menées par l’Agence française des Aires Marines Protégées entre 2008 et 2010 ont largement contribué à une meilleure connaissance des habitats profonds et de l’étage bathyal dans la zone des canyons de la Méditerranée française. Les moyens d’exploration, essentiellement visuels complétés par des pr...
Conference Paper
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Coralligenous outcrops are a Mediterranean sciaphilic habitat whose three-dimensionally layered communities develop on a basal biogenic concretion of calcareous red algae, along with a rich assemblage of sciaphilic sessile animals. The complexity of the evaluation of the ecological status of coralligenous is on a par with the complexity of this hab...
Article
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An inventory of upper subtidal Cystoseira (0-5 m depth) of the Tunisian coasts (La Galite Archipelago excluded) was carried out from March 2012 to February 2013. Seven Mediterranean endemic taxa new for Tunisia were collected: 4 species, Cystoseira algeriensis, C. barbatula, C. crinitophylla, C. susanensis, and 3 infraspecific taxa, C. compressa f....
Article
This synopsis focuses on the effects of climate change on Mediterranean seagrasses, and associated communities, and on the contribution of the main species, Posidonia oceanica, to the mitigation of climate change effects through sequestering carbon dioxide. Whilst the regression of seagrass meadows is well documented, generally linked to anthropoge...
Conference Paper
Full-text available
Biotic indices, which reflect the quality of the environment using species whose function, population or status depending of the quality of a water body, are widely used in the marine realm. The good quality of a water body and the apparent health of species are not always indicative of the good structure and functioning of the whole ecosystem even...
Conference Paper
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Species of the genus Sargassum are large canopy-forming marine brown algae (engineer species) worldwide found from cold-temperate to tropical latitudes. Among this very diversified genus (335 taxa accepted taxonomically), only 9 species (including the introduced and invasive S. muticum) have been reported from the Mediterranean Sea and 6 in France....
Article
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The presence of marine alien species in El-Kouf National Park and the neighbouring areas was assessed using a compilation of available information and observations, a field survey conducted in October 2010 within the framework of the MedMPAnet project and results of further monitoring during June and September 2012. A total of 9 alien species were...
Conference Paper
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The development of the populations of the alien seaweed Hypnea cornuta was followed on a twelve year period in the Mar Piccolo of Taranto. This was the only alien species, among the 13 collected since the eighties, which established in the basin showing an invasive behaviour, even though without any negative effect on environment, fishery, human he...
Article
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Three alien macrophytes, Ascophyllum nodosum, Colpomenia peregrina and Polysiphonia morrowii, are reported for the first time from the Mar Piccolo of Taranto (southern Italy, Mediterranean Sea). Two other species, Agardhiella subulata and Codium fragile subsp. fragile that were not, or were sporadically, detected in the basin since their first reco...
Article
Stegastes planifrons and Stegastes adustus are two abundant territorial damselfishes of Caribbean coral reefs. Their trophic niches and their food utilisation on Guadeloupean reefs at two contrasting sites were compared on the basis of stomach content and stable isotope analyses (N-15/N-14 and C-13/C-12 ratios). While ingested food items slightly d...
Article
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On the basis of morphological and molecular studies, we identified the Australian endemic green alga known as Caulerpa distichophylla along the coasts of Sicily (Italy, Mediterranean Sea). The slender Caulerpa previously reported as C. taxifolia from southeastern Turkey (Gulf of Iskenderun) also belongs to C. distichophylla. Morphologically, C. dis...
Article
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The species introduction process involves a donor region, a vector, a corridor, a recipient region, a candidate species and a variety of filters that hinder the process. All these parameters are of importance for understanding the success or the failure of a non-native species. Some characteristics of the recipient area, such as low species diversi...
Article
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This paper deals with vegetative reproduction by multicellular propagules in Rhodophyta. An extensive examination of the relevant literature shows that this phenomenon in Rhodophyta is not well known. A propagule is here defined as a vegetative multicellular structure which spontaneously detaches from the parent thallus and gives rise to a new indi...
Article
Three alien Rhodophyta, Botryocladia madagascariensis, Hypnea anastomosons and Hypnea valentiae, were recorded and illustrated for the first time from Greece (Aegean Sea and nearby areas). Previously reported from Karpathos Island, B. madagascariensis was observed from Korinthiakos Gulf. Reported as H. esperi from the Mediterranean coast of Israel,...
Conference Paper
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Seagrass meadows and coralligenous assemblages appear as major habitats of the Mediterranean littoral. As part of the characterization of Natura 2000 site along the Cap Corse coast (western Mediterranean basin), a mapping of assemblages and bottom-types present from the surface to a depth of 100 m is carried out. Mapping survey is carried out by us...
Technical Report
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Ce rapport présente la liste de référence française des biocénoses benthiques de Méditerranée. Elle a été élaborée en synthétisant, actualisant et harmonisant les typologies existantes en collaboration avec les experts scientifiques. Il comporte les équivalences entre cette liste de référence et les autres typologies. Un rappel de l’étagement marin...
Conference Paper
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In May 1998 and March 2010, a species of Grateloupia possessing terete to compressed axes with substantial morphological plasticity in branching patterns of axes and lateral branchlets was discovered for the first time in the Thau Lagoon (France) and in the Mar Piccolo of Taranto (Italy), respectively. Morphological studies and rbcL sequence analys...
Article
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Lagoon environments are particularly subject to the introduction, either accidental or voluntary, of alien species that may cause biological pollution. On the basis of morphological data and molecular analyses (rbcL and mitochondrial cox2-cox3 spacer sequences) we confirmed the taxonomic identity (previously only hypothesised) of Grateloupia turutu...
Article
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Nine macroalgal taxa are reported for the first time from Greece (Aegean Sea and nearby areas): the chlorophyte Cladophora nigrescens, the phaeophyceans Cystoseira susanensis and Dictyopteris lucida, and the rhodophytes Centroceras gasparrinii, Ophidocladus simpliciusculus, Peyssonnelia coriacea, Porphyrostromium ciliare, Radicilingua thysanorhizan...
Article
The invasive species Caulerpa racemosa var. cylindracea represents a serious threat to the diversity of benthic assemblages in the Mediterranean Sea. In the present study, a removal experiment was carried out to test whether, after 18 months of C. racemosa var. cylindracea exclusion, the macrophyte assemblage resembled a non-invaded assemblage. The...
Article
Studies on the genus Peyssonnelia (Rhodophyceae). X. Presence of Peyssonnelia codana (Rosenvinge) Denizot in the Mediterranean.—Peyssonnelia codana (Rosenvinge) Denizot, previously known only from Denmark, is recorded from the vicinity of a thermal power plant outlet (Martigues-Ponteau, Gulf of Fos, France). Mediterranean specimens are described an...
Article
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Since its first accidental introduction into the Mediterranean Sea, Caulerpa taxifolia (Vahl) C. Agardh has spread to six Mediterranean countries and has become a major ecological problem. On the basis of morphological and molecular studies (nuclear ribosomal internal transcribed spacer (ITS)), we report for the first time C. taxifolia on the Levan...
Article
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Neomeris annulata Dickie is reported for the first time from the Mediterranean Sea (Syria). The most probable hypothesis concerning the origin of these populations is a recent introduction from the Red Sea via the Suez Canal. The species is grazer-resistant due to the production of CaCO3 and chemical defenses (sesquiterpenes), and the environmental...
Article
The first record of Laurencia caduciramulosa Masuda et Kawaguchi from the northwestern Mediterranean is reported. The hypothesis that this species, known to date from Vietnam, Malaysia and only two stations in southern Italy, has been recently introduced into the Mediterranean Sea is discussed.
Article
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Hypnea cornuta, a species previously introduced into the eastern Mediterranean Sea, has been discovered recent-ly in the Mar Piccolo of Taranto (southern Italy). The spec-imens are in good agreement with Indo-Pacific des-criptions and reference material. It is highly probable that H. cornuta has been introduced either from eastern Med-iterranean or...
Article
A detailed study of the vegetative and reproductive phases of several populations of a common and hitherto misidentified Dasya in Than Lagoon (France, Mediterranean Sea) showed that the material is in good agreement with Asiatic A sessilis. Since April 1984, the date of its first observation in Than Lagoon, D. sessilis has developed abundant reprod...
Article
Full-text available
The poorly known Mediterranean endemic species Cystoseira jabukae Ercegovic (Cystoseiraceae, Fucophyceae) has been collected from Scandola, Corsica. These collections are the first of this species from the coast of France. Study of the Corsican specimens and comparison with specimens from the type locality, Jabuka Island in the mid-Adriatic, have c...
Article
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Probably in 1993 or early 1994, an Asiatic Chondrus, C. giganteus forma flabellatus, was accidentally introduced in the Mediterranean sea where the genus was hitherto unknown. In September 1995, this alga was common on hard substrates along the north coast of Thau lagoon (Herault, France). The Mediterranean specimens are described. The implications...
Article
In 1990, a study of the phytobenthos of the rocky intertidal platforms in the Safi-Essaouira region (Sidi Boulbra, Western Morocco) was carried out at three sites. The intertidal zonation was analysed along permanent transects, and a qualitative and quantitative study of two characteristic units of the eulittoral vegetation-the vegetation belt of F...
Article
A number of 254 taxa and stadia of benthic marine macroalgae were identified on Lavezzi Archipelago: 7 Bangiophyceae, 162 Florideophyceae, 1 Tribophyceae, 47 Phaeophyceae and 37 Chlorophyta. Ten of them are mentioned for the first time on Corsica: The Florideophyceae Goniolithon papillosum, Griffithsia opuntioides, Gulsonia nodulosa, Halosia elisae...
Article
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A study of the impact of Caulerpa taxifolia on the Posidonia oceanica beds was carried out in two similar areas, one with and one without the alga. In the invaded site, nearly all substrates around the living P. oceanica were occupied by dense C. taxifolia meadows. During the winter, few differences were recorded in comparison with the Reference si...
Article
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A detailed study of two similar areas, one with and one without C. taxifolia, shows a drastic impoverishment of the algal community where Caulerpa has invaded. Many of the normally expected species have disappeared: firstly the fleshy species with their epiphytes, then the filamentous species and finally the crustose algae. The most marked effect i...
Article
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A new species of Antithamnion from Algeria, is described: A. algeriensis. It differs from the closely related species of Antithamnion (distichous whorl-branchlets, opposite and abaxial branchlets and gland cells) by the branching pattern of the axis, the arrangement of whorl-branchlets as well as the frequency, and the location and shape of the gla...
Article
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The recent discovery of this alga from many localities of the E Mediterranean Sea constitutes a new illustration of the Lessepsian migration process. -from English summary
Article
A study of different populations of Predaea (Gymnophloeaceae, Rhodophyta) in the Mediterranean Sea confirms the existence of two species: P. ollivieri J. Feldmann and P. pusilla (Berthold) J. Feldmann. Not collected since its original description from Naples, P. pusilla has been rediscovered in several areas of the Western Mediterranean Sea and in...
Article
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Study of the feeding behaviour of Sarpa salpa in Corsica, Bouches-du-Rhone and Var, shows that it is the main herbivorous fish of the W Mediterranean. In dense algal settlements, it behaves as a highly selective herbivorous browser. When trophic resources are overgrazed, it tends to become a generalist grazer. Young specimens show a marked preferen...