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| Registros recuperados: 414 | |
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| Percopo, Isabella; Siano, Raffaele; Cerino, Federica; Sarno, Diana; Zingone, Adriana. |
| The section of the Liguro-Provencal basin north of the Balearic Islands is one of the most productive sites in the whole Mediterranean Sea, with intense phytoplankton bloom lasting about 2 months in late winter-early spring. The phytoplankton species composition of the area was investigated using light and electron microscopy to analyze bottle and net samples collected at several stations in spring 2000 and 2003. Serial dilution cultures established from bottle samples were also examined. A total of 168 phytoplankton taxa was identified, consisting of 73 Coscinodiscophyceae, 47 Dinophyceae, 25 Coccolithophyceae and 4 Prymnesiophyceae, 5 Prasinophyceae, 3 Chrysophyceae, 2 Cryptophyceae, 2 Dictyochophyceae, 1 Euglenophyceae, 1 Pelagophyceae, 1... |
| Tipo: Text |
Palavras-chave: Check-list; Diversity; NW Mediterranean Sea; Phytoplankton; Serial dilution cultures. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00038/14916/12245.pdf |
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| Descombes, Patrice; Leprieur, Fabien; Albouy, Camille; Heine, Christian; Pellissier, Loic. |
| Aim In interaction with past climate changes, it is likely that plate tectonics contributed to the shaping of current global species diversity, but so far this has not been statistically quantified at the global level. Here, we tested whether plate tectonics since the breakup of Gondwana left an imprint on current patterns of species richness of amphibians, birds and mammals. Location Global. Methods We reconstructed the absolute positions of continental plates since the Early Cretaceous and used this information to derive variables of latitudinal shifts and potential exchanges among landmasses that could have modulated species richness. Using a multi-model inference approach combining both contemporary and historical variables, we quantified the... |
| Tipo: Text |
Palavras-chave: Amphibian; Bird; Continental drift; Diversity; Indo-Pacific; Madagascar; Mammal; Plate tectonics; Southeast Asia; Wallace line. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00373/48413/48711.pdf |
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| Takai, Ken; Miyazaki, Masayuki; Hirayama, Hisako; Nakagawa, Satoshi; Querellou, Joel; Godfroy, Anne. |
| P>Two novel, thermophilic piezophiles, capable of chemolithoautotrophic growth, are successfully cultivated and isolated from a black smoker chimney at the TAG field (Mid Atlantic Ridge: MAR) by using a piezophilic cultivation technique. Both strains (strains 106 and 108) represent dominant cultivated populations of the microbial communities in the chimney surface habitat. Strain 106 represents typically thin, long spiral cells under the piezophilic growth condition but short bent cells under the non-piezophilic condition. It is a strictly chemolithoautotrophic gammaproteobacterium using reduced sulfur compounds as the electron donors, and nitrate and O-2 as the electron acceptors. Based on the 16S rRNA gene sequence, strain 106 would represent a novel... |
| Tipo: Text |
Palavras-chave: Sp. nov.; Ecological signifiance; Hydrostatic pressure; Subsurface biosphere; Base composition; High temperature; Membrane lipids; Gen. nov.; Microorganisms; Diversity. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6652.pdf |
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| Ribeiro, Lourenço; Le Bris, Anthony; Hernandez Farinas, Tania; Buchet, Remi; Dutertre, Mickaël; Metzger, Edouard; Rosa, Philippe; Gernez, Pierre; Lerouxel, Astrid; Barille, Laurent. |
| In order to establish the ecological status of water bodies, the European Water Framework Directive (WFD) is based on the evaluation of a number of biological quality elements, as well as physical parameters supporting the biology. In estuaries, phytoplankton monitoring was not considered relevant because of the high turbidity characterizing the large metropolitan estuaries and the French overseas departments (Guyana). In this work, we considered the possibility of using microphytobenthos (MPB) as a biological indicator of the ecological status of estuaries. This activity report summarizes the actions undertaken in 2017 under an AFB / Université de Nantes convention, which is structured around two main axes: the first axis is based on the analysis of the... |
| Tipo: Text |
Palavras-chave: DCE; Diatomées benthiques; Diversité; Estuaires; Facteurs naturels; Gradient de perturbation; Loire; Bio-indication; Microphytobenthos; Pressions anthropiques; Télédétection.; Anthropogenic pressures; Benthic diatoms; Bio-indication; Diversity; Estuary; Loire; Microphytobenthos; Natural factors; Perturbation gradient; Remote sensing; WFD. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00446/55725/57376.pdf |
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| Migne, A; Davoult, D. |
| Because of strong tidal currents, the bottom of the Dover Strait consists of coarse sediment which is colonized by a pebble community. A quantitative study, based on 0.1 m(2) quadrat samples taken by divers, was conducted on this community to establish the richness of benthic macrofauna (in terms of biomass and diversity) and to provide conclusive data on global community structure (spatial and temporal heterogeneity, trophic structure). Eight samples were taken between June 1992 and June 1993, eight replicates being taken on each sampling visit. One hundred and one species were identified, in 10 zoological groups, and a mean biomass of 281 g.m(-2) (ash free dry weight) was calculated. The Shannon diversity index was low (H' = 1.24) because of the strong... |
| Tipo: Text |
Palavras-chave: Macrobenthos; Biomass; Trophic structure; Diversity; Spatial heterogeneity. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20409/18076.pdf |
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| Baliere, Charlotte. |
| The contamination of coastal areas by potentially pathogenic enteric bacteria is of concern for the sustainability of some uses, such as shellfish farming, recreational shellfish harvesting and bathing. The contamination of these environments may occur through the land-spreading of livestock wastes, animal feces deposited on pastures, wastewaters from slaughterhouses or from municipal wastewater treatment plants. The presence of these bacteria in coastal environment may present a potential risk to human health. In fact, shellfish-borne outbreaks or human infections may occur by the consumption of shellfish from contaminated areas or the ingestion of water during bathing in contaminated waters, respectively. To date, few studies focusing on the presence and... |
| Tipo: Text |
Palavras-chave: STEC; EPEC; Coquillages; Diversité; Virulence; Persistance; STEC; EPEC; Shellfish; Diversity; Virulence; Persistence. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00312/42322/41653.pdf |
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| Wijnsma, G; Wolff, Wj; Meijboom, A; Duiven, P; De Vlas, J. |
| The Banc d'Arguin in Mauritania, West Africa, is an area of tidal flats and shallow inshore waters bordering the sandy desert of the Sahara. The project Banc d'Arguin 1985-1986 investigated predominantly benthic biomass and production, the same data allow investigation of the species diversity and the distribution of the tidal flat fauna of the Banc d'Arguin. We sieved and analysed 410 core samples (diameter 10 cm) from 82 locations with 0.6 mm mesh size. A total of 111 taxa were identified. Polychaeta were most diverse with 42 species belonging to 20 families. Other large species groups were Gastropoda (20 species, 14 families), Amphipoda (14 taxa, 8 families) and Bivalvia (15 species, 10 families). Densities ranged from 152 to 5635 ind. m(-2), with an... |
| Tipo: Text |
Palavras-chave: Banc d'Arguin; Bethos; Diversité; Limicole; Banc d'Arguin; Benthos; Diversity; Shorebirds. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43623/43309.pdf |
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| Gaertner, J; Taquet, Marc; Dagorn, L; Merigot, B; Aumeeruddy, R; Sancho, G; Itano, D. |
| This study provides a baseline measure of pelagic fish species diversity around fish aggregating devices (FADs) in the Western Indian Ocean. Using data from visual censuses made by SCUBA divers around drifting FADs we (1) analysed 11 diversity indices describing 4 main components of pelagic diversity: number of species, evenness, taxonomic diversity and rarity and (2) discussed the viability of using visual censuses around FADs to monitor temporal and spatial changes in diversity patterns of pelagic fishes in the future. Our results not only show that a single index, such as species richness or the Shannon-Wiener index, cannot provide a complete description of pelagic fish diversity around FADs, but also that some components of diversity appear to be... |
| Tipo: Text |
Palavras-chave: Indian Ocean; Drifting FADs; Diversity; Pelagic fishes. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4674.pdf |
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| Bai, Chang-ming; Morga, Benjamin; Rosani, Umberto; Shi, Jie; Li, Chen; Xin, Lu-sheng; Wang, Chong-ming. |
| Ostreid herpesvirus 1 (OsHV-1) is an important pathogen associated with mass mortalities of cultivated marine mollusks worldwide. Since no cell line allows OsHV-1 replication in vitro, it is difficult to isolate enough high-purity viral DNA for High-Throughput Sequencing (HTS). We developed an efficient approach for the enrichment of OsHV-1 DNA for HTS with long-range PCR. Twenty-three primer pairs were designed to cover 99.3% of the reference genome, and their performances were examined on ten OsHV-1 infected samples. Amplicon mixtures from six successfully amplified samples were sequenced with Illumina platform, and one of them (ZK0118) was also sequenced with the PacBio platform. PacBio reads were assembled into 2 scaffolds compared to 9−68 scaffolds... |
| Tipo: Text |
Palavras-chave: Long-range PCR; OsHV-1; High-throughput sequencing; Evolution; Diversity. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00464/57566/64184.pdf |
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| Lorance, Pascal; Souissi, Sami; Uiblein, Franz. |
| The catch from bottom longline stations sampled from a series of research cruises around Lanzarote and Fuerteventura (Canary Islands, NE Atlantic) was analysed in terms of fish distribution, density and diversity. The distribution of the number of species and individuals caught per station appeared to fit well the Poisson and Exponential distribution function, respectively. In particular, the parameter of the Poisson's distribution appeared to provide an index of the point (at station scale) diversity, and its confidence interval, allowing for statistical comparisons. The relationships between point diversity, the alpha diversity (in the depth strata) and the beta diversity (along the depth gradient) were investigated. Around the islands, the density and... |
| Tipo: Text |
Palavras-chave: Canary Islands; Probability distributions; Density; Diversity; Demersal fishes; Longline. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-566.pdf |
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| Jebbar, Mohamed; Hickman-lewis, Keyron; Cavalazzi, Barbara; Taubner, Ruth-sophie; Rittmann, Simon K.-m. R.; Antunes, Andre. |
| The icy moons of the outer Solar System harbor potentially habitable environments for life, however, compared to the terrestrial biosphere, these environments are characterized by extremes in temperature, pressure, pH, and other physico-chemical conditions. Therefore, the search for life on these icy worlds is anchored on the study of terrestrial extreme environments (termed “analogue sites”), which harbor microorganisms at the frontiers of polyextremophily. These so-called extremophiles have been found in areas previously considered sterile: hot springs, hydrothermal vents, acidic or alkaline lakes, hypersaline environments, deep sea sediments, glaciers, and arid areas, amongst others. Such model systems and communities in extreme terrestrial environments... |
| Tipo: Text |
Palavras-chave: Extremophiles; Prokaryotes; Metabolism; Diversity; Adaptation; Space explorat. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00606/71771/70275.pdf |
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| Le Joncour, Anna; Blanchard, Fabian; Tagliarolo, Morgana. |
| Estuarine and coastal areas are often considered as hotspots due to their high diversity and ecological importance. However, communities living on those areas are often submitted to fishery and climate change pressures causing modifications on fish assemblages. French Guiana’s coastal shelf is characterised by warm waters with high turbidity and low salinity caused by the large river discharges from the Amazon and nearby estuaries. The high productivity of these areas supports fisheries and aquaculture activities. However, the structure and dynamics of coastal fish populations in French Guiana have seldom been studied. The aim of this study was to understand the effect of environmental conditions, as well as the influence of the coast and nearby estuaries... |
| Tipo: Text |
Palavras-chave: French Guiana; Coastal community; Estuary; Diversity; Tropical waters; Fisheries management. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00607/71929/73534.pdf |
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| Richert, Laurent; Golubic, Stjepko; Le Guedes, Roland; Herve, Annie; Payr, Claude. |
| Cyanobacterial populations, the primary producers and builders of 'kopara' microbial mats were studied in four selected ponds along the rim of the Rangiroa Atoll, French Polynesia using a polyphasic approach. Seven isolates were maintained in uni-cyanobacterial cultures, characterized morphotypically and phylogenetically by evaluating sequences of the 16S rRNA gene of about 620 base pairs in length. Cyanobacteria in natural populations were analyzed microscopically, characterized morphotypically, and compared with cultured strains. Three of the isolates were identified in the field samples: Lyngbya aestuarii, Johannesbaptistia pellucida and Chroococcus submarinus were present in the mats only as minor components, whereas the species of Schizothrix that... |
| Tipo: Text |
Palavras-chave: 16S rRNA; Polyphasic approach; Phylogeny; Microbial mats; Microbial ecology; Kopara; Diversity; Cyanobacteria; Culture. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2050.PDF |
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| Lalegerie, Fanny; Lajili, Sirine; Bedoux, Gilles; Taupin, Laure; Stiger-pouvreau, Valerie; Connan, Solène. |
| To cope with the biotic and abiotic stresses experienced within their environment, marine macroalgae have developed certain defence mechanisms including the synthesis of photo-protective molecules against light and particularly harmful UV radiation. The aim of this study was to screen selected red algae, a highly diverse phylogenetic group, for the production of photo-protective molecules. The pigment content and composition (i.e. chlorophyll-a, phycobiliproteins and carotenoids) and the composition of mycosporine-like amino acids (MAAs) were studied in 40 species of red macroalgae collected in Brittany (France), at two distinct periods (i.e. February and July 2017). A high inter-specific variability was demonstrated in terms of pigment content and MAA... |
| Tipo: Text |
Palavras-chave: Algae; Diversity; HPLC; MAAs; Metabolites; Photo-protection; Pigments; Rhodophyta; Screening. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00488/59929/63133.pdf |
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| Lobry, Jeremy; David, V; Pasquaud, S; Lepage, M; Sautour, B; Rochard, E. |
| Estuarine areas provide highly valuable ecosystem benefits for human populations, despite being under intense demographic, economic and ecological pressures. Hence, an understanding of the structure and function of estuarine ecosystems is essential for understanding the persistence and stability of these ecosystems and their response to perturbations. This study synthesises available data and knowledge about the Gironde estuary (SW France) in a mass-balanced trophic model to illustrate potential key patterns in the functioning of the estuarine ecosystem and key elements of its stability. In order to evaluate the total direct and indirect impact on the whole community of the 2 main sources of anthropogenic perturbations in the estuarine area, mortalities... |
| Tipo: Text |
Palavras-chave: Gironde estuary; Ecopath; Diversity; Stability; Network analysis; Food web; Estuarine ecosystem. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4290.pdf |
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| Registros recuperados: 414 | |
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