Fiche participant :
Nom : Rousseau
Prénom : Florence
Liste des participations aux campagnes accessibles [+] [-]
- ATIMO VATAE
- Fort-Dauphin (Tue Apr 27 00:00:00 CEST 2010 - Wed May 19 00:00:00 CEST 2010)
- Collecte - Tri (Algologie, Muséum national d'Histoire naturelle)
- BOA1
- (Mon Sep 05 00:00:00 CEST 2005 - Thu Sep 15 00:00:00 CEST 2005)
- Collecte - Tri (Algologie, Muséum national d'Histoire naturelle)
- KARUBENTHOS 2012
- Première partie (Wed May 02 00:00:00 CEST 2012 - Mon May 28 00:00:00 CEST 2012)
- Collecte - Plongée (Algologie, Université Paris IV)
Bibliographie (6) [+] [-]
Exporter les bibliographies
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Boo G.H., Le gall L., Rousseau F., De reviers B., Coppejans E., Anderson R.J. & Boo S.M. 2015. Phylogenetic relationships of Gelidiella (Gelidiales, Rhodophyta) from Madagascar with a Description of Gelidiella incrassata sp. nov. Cryptogamie, Algologie 36(2): 219-237. DOI:10.7872/crya.v36.iss2.2015.219
Résumé [+] [-]We evaluated the relationships among species in the genus Gelidiella using 47 rbcL and 29 COI sequences, including those from 18 specimens collected in Madagascar. Molecular analyisis revealed the presence of three major lineages among Magalasy Gelidiella which were assigned, based on morpho-anatomical observation, to Gelidiella acerosa, G. ligulata and a so far not described species for which we here proposed the name G. incrassata. Both molecular and morphological data demonstrated the presence of three species in Madagascar: the G. acerosa complex, G. ligulata, and G. incrassata sp. nov., described here. Gelidiella incrassata was collected on small gravel from the intertidal down to a depth of 14 m on the southeast coast of Madagascar. It is distinguished by its large size (up to 7 cm), opposite to alternate ramuli, thick-walled cortical and medullary cells, and stalked tetrasporangial stichidia with irregular arrangement of tetrasporangia. Phylogenetic analyses of rbcL and COI sequences revealed the sister relationship between G. incrassata and G. fanii from southeast Asia and Hawaii. Gelidiella acerosa comprised three genetic groups in Madagascar, each being genetically distinct (pairwise distances, 4.9–8.3% for COI and 1.2–2.3% for rbcL). Further sampling of G. acerosa is needed before taxonomic revisions can be proposed. The distribution of G. ligulata is expanded to include the southwest Indian Ocean.
Campagnes accessibles citées (1) [+] [-]
Codes des collections associés: PC (Cryptogames) -
Boo G.H., Le gall L., Hwang I.K., Rousseau F. & Yoon H.S. 2022. Species diversity of Gelidium from Southern Madagascar evaluated by an integrative taxonomic approach. Diversity 14(10): 1-19. DOI:10.3390/d14100826
Résumé [+] [-]The diversity of red algae is significantly increasing; in the recent interest of climate changes, taxonomic and biogeographic studies are needed in untouched regions such as ecological important islands. We examined a collection of Gelidium specimens gathered during the 2010 Atimo Vatae expedition based on the morphology and DNA sequencing of mitochondrial cox1 and plastid rbcL. Both morphological and molecular datasets demonstrated the presence of three species in Madagascar; G. leptum G.H.Boo, L.Le Gall and H.S.Yoon, sp. nov., described here, and G. sclerophyllum W.R.Taylor and G. usmanghanii Afaq-Husain and Shameel. Gelidium leptum is distinguished by thin, slender, flattened thalli with irregular branches, compactly arranged thickwalled cells in medulla, sparse rhizoidal filaments at both sides of branches, and elongate sori of tetrasporangia. Gelidium sclerophyllum, previously considered as endemic to the Tropical Eastern Pacific, is first reported in the Indian Ocean and Hawai’i; G. usmanghanii, previously reported to occur in Pakistan and Oman, also presents a first record in the Southern Hemisphere. Phylogenies inferred from cox1 and rbcL sequences suggests that each of the three species likely diverged from different ancestors. The Madagascan Gelidium comprises two geographical elements; Madagascan endemic (G. leptum) and widespread species (G. sclerophyllum and G. usmanghanii).
Campagnes accessibles citées (1) [+] [-]
Codes des collections associés: PC (Cryptogames) -
Dupont J., Magnin S., Rousseau F., Zbinden M., Frebourg G., Samadi S., Richer de forges B. & Jones G.E. 2009. Molecular and ultrastructural characterization of two ascomycetes found on sunken wood off Vanuatu Islands in the deep Pacific Ocean. Mycological Research 113(12): 1351-1364. DOI:10.1016/j.mycres.2009.08.015
Résumé [+] [-]A new genus of a deep-sea ascomycete with one new species, Alisea longicolla, is described based on analyses of 18S and 28S rDNA sequences and morphological characters. A. longicolla was found together with oceanitis scuticella, on small twigs and sugar cane debris trawled from the bottom of the Pacific Ocean off Vanuatu Islands. Molecular and morphological characters indicate that both fungi are members of Holosphaeriaceae. Within this family, O. scuticella is phylogenetically related to Ascosalsum and shares similar ascospore morphology and appendage ontogeny. The genus Ascosalsum is considered congeneric with Oceanitis and Ascosalsum cincinnatulum, Ascosalsum unicaudatum and Ascosalsum viscidulum are transferred to Oceanitis, an earlier generic name. (C) 2009 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
Campagnes accessibles citées (1) [+] [-]
Codes des collections associés: RF (Souches Fongiques) -
Peña freire V., Rousseau F., De reviers B. & Le gall L. 2014. First assessment of the diversity of coralline species forming maerl and rhodoliths in Guadeloupe, Caribbean using an integrative systematic approach. Phytotaxa 190(1): 190-215. DOI:10.11646/phytotaxa.190.1.13
Résumé [+] [-]The present study documents species of coralline algae that form maerl and rhodoliths in Guadeloupe, Caribbean using an integrative systematic approach of combining molecular (COI-5P, psbA) and morphological/anatomical data. Maerl and rhodoliths were collected by SCUBA and dredging from six localities in Guadeloupe during the Karubenthos Expedition, which was coordinated by the Parc National de la Guadeloupe and the Muséum National d´Histoire Naturelle. Of the twelve maerl and rhodolith specimens collected and sequenced, eight specific entities were delimitated based on the analysis of molecular data: Lithothamnion cf. ruptile, five species of the genus Lithothamnion, one species of the genus Spongites, and the remaining one was either assigned to the genus Lithoporella or Mastophora. Morphological/anatomical data are presented for each of these species. Molecular analyses revealed that Lithothamnion. cf ruptile and other four species (Lithothamnion spp.1–4) were resolved in a distinct lineage than the other Lithothamnion species examined. Nevertheless, these five species were provisionally remained in the genus Lithothamnion based on the presence of flared epithallial cells. Previously, only three species of Lithothamnion have been cited in the Caribbean. Till this study species belonging to the genus Spongites have not been hitherto reported for this region. The specimen identified as either Lithoporella or Mastophora shared anatomical features with both genera. Further examination of reproductive material is required to identify this specimen to a lower taxonomical rank. This study is the first to report the occurrence of maerl and rhodoliths belonging to the genus Lithothamnion at 110 m depth; this record being the deepest for the genus in the Caribbean Sea. Our results have revealed that species diversity of Caribbean maerl has been underestimated and further surveys coupled with an integrative taxonomic approach on this biodiversity hotspot are necessary.
Campagnes accessibles citées (1) [+] [-]
Codes des collections associés: PC (Cryptogames) -
Rousseau F., Gey D., Kurihara A., Maggs C.A., Martin-lescanne J., Payri C., De reviers B., Sherwood A.R. & Le gall L. 2017. Molecular phylogenies support taxonomic revision of three species of Laurencia (Rhodomelaceae, Rhodophyta), with the description of a new genus. European Journal of Taxonomy 269: 1-19. DOI:10.5852/ejt.2017.269
Résumé [+] [-]The systematics of the Laurencia complex was investigated using a taxon-rich data set including the chloroplast ribulose-1,5-bisphosphate carboxylase/oxygenase large subunit (rbcL) gene only and a character-rich data set combining mitochondrial cytochrome oxidase 1 (COI-5P), the rbcL marker, and the nuclear large subunit of the ribosomal operon (LSU). Bayesian and ML analyses of these data sets showed that three species hitherto placed in the genus Laurencia J.V.Lamour. were not closely related to Laurencia s. str. Laurencia caspica Zinova & Zaberzhinskaya was the sister group of the remaining Osmundea Stackh. species, L. crustiformans McDermid joined Palisada and L. fl exilis Setch. consisted of an independent lineage. In light of these results a new genus, Ohelopapa F.Rousseau, Martin-Lescanne, Payri & L.Le Gall gen. nov., is proposed to accommodate L. fl exilis. This new genus is morphologically characterized by four pericentral cells in each vegetative axial segment; however, it lacks ‘corps en cerise’ in cortical cells and secondary pit connections between cortical cells, which are characteristic of Laurencia. Three novel combinations are proposed to render the classifi cation closer to a natural system: Ohelopapa fl exilis (Setch.) F.Rousseau, Martin-Lescanne, Payri & L.Le Gall comb. nov., Osmundea caspica (Zinova & Zaberzhinskaya) Maggs & L.M.McIvor comb. nov. and Palisada crustiformans (McDermid) A.R.Sherwood, A.Kurihara & K.W.Nam comb. nov.
Campagnes accessibles citées (1) [+] [-]
Codes des collections associés: PC (Cryptogames) -
Samadi S., Dupont J., Rousseau F., Haga T., Amos G. & Richer de forges B. 2015. Campagne BOA1 du N.O. "ALIS" au Vanuatu du 2 au 18 septembre 2005.
Campagnes accessibles citées (1) [+] [-]