SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Diversity, ecology, biogeography and evolution of the prevalent brown algal genus Lobophora in the greater Caribbean sea, including the description of five new species

Lorion, Julien; Duperron, Sebastien; Gros, Olivier; Cruaud, Corinne; Samadi, Sarah.

Bathymodiolin mussels occur at hydrothermal vents and cold seeps, where they thrive thanks to symbiotic associations with chemotrophic bacteria. Closely related genera Idas and Adipicola are associated with organic falls, ecosystems that have been suggested as potential evolutionary 'stepping stones' in the colonization of deeper and more sulphide-rich environments. Such a scenario should result from specializations to given environments from species with larger ecological niches. This study provides molecular-based evidence for the existence of two mussel species found both on sunken wood and bones. Each species specifically harbours one bacterial phylotype corresponding to thioautotrophic bacteria related to other bathymodiolin symbionts. Phylogenetic...

Tipo: Text

Palavras-chave: Idas; Adipicola; Molecular taxonomy; Organic falls; Symbiosis; Thioautotrophy.

Ano: 2009

URL: https://archimer.ifremer.fr/doc/00206/31680/30056.pdf

Two Vibrio splendidus related strains collaborate to kill Crassostrea gigas: taxonomy and host alterations

Vieira, Christophe; Morrow, Kathleen; D'Hondt, Sofie; Camacho, Olga; Engelen, Aschwin H.; Payri, Claude E.; De Clerck, Olivier.

Distributed in tropical and warm‐temperate waters worldwide, Lobophora species are found across the Greater Caribbean (i.e., Caribbean sensu stricto, Gulf of Mexico, Florida, the Bahamas, and Bermuda). We presently discuss the diversity, ecology, biogeography and evolution of the Greater Caribbean Lobophora species based on previous studies and an extensive number of samples collected across the eastern, southern and to a lesser extent western Caribbean. A total of 18 Lobophora species are now documented from the Greater Caribbean, of which five are newly described (L. agardhii sp. nov., L. dickiei sp. nov., L. lamourouxii sp. nov., L. richardii sp. nov. and L. setchellii sp. nov.). Within the Greater Caribbean, the eastern Caribbean and the Central...

Tipo: Text

Palavras-chave: Cox3; Eastern Caribbean; Greater Caribbean; Lobophora; Molecular taxonomy; Western Caribbean.

Ano: 2020

URL: https://archimer.ifremer.fr/doc/00614/72570/71525.pdf

Gay, Melanie; Renault, Tristan; Pons, Anne-marie; Le Roux, Frédérique.

For several years, strains phenotypically related to Vibrio splendidus have been associated with mortality outbreaks of molluscs. A former study on Crassostrea gigas demonstrated the genetic diversity of V splendidus strains associated with diseased animals. Another study suggested that different strains may act in an additive/synergistic way leading to higher C. gigas mortality rates. Here, a strain pair (31+32) was characterised at taxonomic and virulence levels. Using a polyphasic approach, these strains were confirmed to be V splendidus-related, without a clear discrimination between V. kanaloae and V. pomeroyi since hybridisation rates with both these strains were above 70%. Following experimental infection of C. gigas by injection in the adductor...

Tipo: Text

Palavras-chave: Histopathology; Molecular taxonomy; Agonism; Vibriosis.

Ano: 2004

URL: http://archimer.ifremer.fr/doc/2004/publication-2912.pdf

Mitochondrial phylogeny of grey mullets (Acanthopterygii: Mugilidae) suggests high proportion of cryptic species

Durand, Jean-dominique; Borsa, Philippe.

The low level of morphometric variability and the poor phylogenetic information borne by the morpho-anatomical characters used thus far in the systematics of grey mullets (Mugilidae) emphasize the utility of molecular systematics in this family. A recent mitochondrial phylogeny of grey mullets has uncovered multiple deep lineages within several species, flagging putative cryptic species. Here, we considered that several of the deeply divergent lineages represent separate species based on either the tree topology, independent data from nuclear markers, geographic distributions, or a combination of the foregoing. By analogy with these well-documented cases, we considered other deep lineages in seven genera we focused on to represent putative cryptic species....

Tipo: Text

Palavras-chave: Molecular taxonomy; Revision; Chelon; Crenimugil; Dajaus; Ellochelon; Mugil; Osteomugil; Planiliza.

Ano: 2015

URL: https://archimer.ifremer.fr/doc/00626/73854/73613.pdf

Lobophora (Dictyotales) Species Richness, Ecology and Biogeography Across the North ‐ Eastern Atlantic Archipelagos and Description of Two New Species 1

Zoantharians (Hexacorallia: Zoantharia) associated with cold-water corals in the Azores Region: new species and associations in the deep sea

Vieira, Christophe; Henriques, Filipe; D'Hondt, Sofie; Neto, Ana; Almada, Carmen H.; Kaufmann, Manfred; Sansón, Marta; Sangil, Carlos; Clerck, Olivier De.

The brown alga Lobophora (Dictyotales, Phaeophyceae) is an important macroalga in the North‐eastern Atlantic archipelagos (i.e., Macaronesia). Notably in the Canaries it can dominate benthic assemblages. While the genus has been the subject of several ecological studies in the Canaries, no study has yet been conducted to assess species‐level diversity of Lobophora in Macaronesia. We reassessed the diversity of Lobophora in Macaronesia, reporting the presence of seven species (L. caboverdeana sp. nov., L. canariensis, L. dagamae sp. nov., L. delicata, L. dispersa, L. littlerorum, and L. schneideri). Lobophora spp. from Macaronesia are morphologically and ecologically distinguishable. In the Canaries, L. schneideri dominates the photophilic assemblages from...

Tipo: Text

Palavras-chave: Barcoding; Cox3; Macaronesia; Phylogeny; Molecular taxonomy.

Ano: 2020

URL: https://archimer.ifremer.fr/doc/00654/76573/77704.pdf

Searching for cryptic species in Erpobdella octoculata (L.) (Hirudinea: Clitellata): discordance between the results of genetic analysis and cross-breeding experiments

Carreiro-silva, Marina; Ocana, Oscar; Stankovic, David; Sampaio, Iris; Porteiro, Filipe M; Fabri, Marie-claire; Stefanni, Sergio.

Zoantharians are a group of cnidarians that are often found in association with marine invertebrates, including corals, in shallow and deep-sea environments. However, little is known about deep-sea zoantharian taxonomy, specificity and nature of their associations with their coral hosts. In this study, analyses of molecular data (mtDNA COI, 16S and 12S rDNA) coupled with ecological and morphological characteristics were used to examine zoantharian specimens associated with cold-water corals at depths between 110 and 800 m from seamounts and island slopes in the Azores region. The zoantharians examined were found living in association with stylasterids, antipatharians and octocorals. From the collected specimens, four new species were identified: (1)...

Tipo: Text

Palavras-chave: Antipatharians; Gorgonians; Molecular taxonomy; Parasitic; Phylogeny; Stylasterids; Zoantharia.

Ano: 2017

URL: https://archimer.ifremer.fr/doc/00377/48818/49216.pdf

Koperski, P.; Milanowski, R.; Krzyk, A..

The main aim of this study was to reveal reproduction barriers and potentially cryptic radiation within the very common and morphologically variable leech species - Erpobdella octoculata (L., 1758). The differences in reproductive success of the morphological forms were compared experimentally. The data based on the results of field sampling and analysis of ITS and COI sequences is also presented. The results of the analysis of DNA sequences clearly show lack of reproduction barriers between the analysed morphological forms. Subtle differences in DNA sequences between individuals, found with the use of the arbitrary primers method, seem to be related mainly to geographical distance between sub-populations. On the basis of these results, E. octoculata...

Preliminary notes on dual relevance of ITS sequences and pigments in Hygrocybe taxonomy .

Palavras-chave: COI; Cryptic species; Discordance; Hirudinea; ITS; Molecular taxonomy; 42.76.

Ano: 2011

URL: http://www.repository.naturalis.nl/record/369712

Babos, M.; Halász, K.; Zagyva, T.; Zöld-Balogh, Á.; Szegö, D.; Bratek, Z..

The relationships based on ITS sequences of 48 Hygrocybe s.l. specimens were studied and compared with previously described taxonomic groups. Our specimens formed two well separated genetic groups. The first one includes the species characterized by vivid yellow and red colours, while species belonging to other clades were pallid or pale brown, and in most cases with pink or olive tones. This separation is supported by the presence of muscaflavin pigments among some species referred to Hygrocybe (Bresinsky & Kronawitter 1986). The subgenera distinguished by morphological features can be relatively well recognized on phylogenetic trees, however, the majority of sections were not supported. Variability in the ITS region of Hygrocybe species is unusually...

Meiofaunal cryptic species challenge species delimitation: the case of the Monocelis lineata (Platyhelminthes: Proseriata) species complex

Palavras-chave: Hygrocybe; ITS region; Molecular taxonomy; Muscaflavin pigments.

Ano: 2011

URL: http://www.repository.naturalis.nl/record/532184

Scarpa, F.; Cossu, P.; Lai, T.; Sanna, D.; Curini-Galletti, M.; Casu, M..

Given the pending biodiversity crisis, species delimitation is a critically important task in conservation biology, but its efficacy based on single lines of evidence has been questioned as it may not accurately reflect species limits and relationships. Hence, the use of multiple lines of evidence has been portrayed as a means to overcome identification issues arising from gene/ species tree discordance, morphological convergence or recent adaptive radiations. Here, the integrative taxonomic approach has been used to address the study of the Monocelis lineata species complex. The taxonomic resolution of the complex is challenging, as the species lacks sclerotised copulatory structures, which as a rule of thumb aid identification in Proseriata. Eighteen...

One fungus, which genes? Development and assessment of universal primers for potential secondary fungal DNA barcodes

Palavras-chave: Integrative taxonomic approach; Meiofauna conservation; Molecular dating; Molecular phylogeny; Molecular taxonomy; RDNA 18S-28S.

Ano: 2016

URL: http://www.repository.naturalis.nl/record/607690

Stielow, J.B.; Lévesque, C.A.; Seifert, K.A.; Meyer, W.; Irinyi, L.; Smits, D.; Renfurm, R.; Verkley, G.J.M.; Groenewald, M.; Chaduli, D.; Lomascolo, A.; Welti, S.; Lesage-Meessen, L.; Favel, A.; Al-Hatmi, A.M.S.; Damm, U.; Yilmaz, N.; Houbraken, J.; Lombard, L.; Quaedvlieg, W.; Binder, M.; Vaas, L.A.I.; Vu, D.; Yurkov, A.; Begerow, D.; Roehl, O.; Guerreiro, M.; Fonseca, A.; Samerpitak, K.; Diepeningen, A.D. van; Dolatabadi, S.; Moreno, L.F.; Casaregola, S.; Mallet, S.; Jacques, N.; Roscini, L.; Egidi, E.; Bizet, C.; Garcia-Hermoso, D.; Martin, M.P.; Deng, S.; Groenewald, J.Z.; Boekhout, T.; Beer, Z.W. de; Barnes, I.; Duong, T.A.; Wingfield, M.J.; Hoog, G.S. de; Crous, P.W.; Lewis, C.T.; Hambleton, S.; Moussa, T.A.A.; Al-Zahrani, H.S.; Almaghrabi, O.A.; Louis-Seize, G.; Assabgui, R.; McCormick, W.; Omer, G.; Dukik, K.; Cardinali, G.; Eberhardt, U.; Vries, M. de; Robert, V..

The aim of this study was to assess potential candidate gene regions and corresponding universal primer pairs as secondary DNA barcodes for the fungal kingdom, additional to ITS rDNA as primary barcode. Ampliﬁcation efﬁciencies of 14 (partially) universal primer pairs targeting eight genetic markers were tested across > 1 500 species (1 931 strains or specimens) and the outcomes of almost twenty thousand (19 577) polymerase chain reactions were evaluated. We tested several well-known primer pairs that amplify: i) sections of the nuclear ribosomal RNA gene large subunit (D1–D2 domains of 26/28S); ii) the complete internal transcribed spacer region (ITS1/2); iii) partial β-tubulin II (TUB2); iv) γ-actin (ACT); v) translation elongation factor 1-α (TEF1α);...