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A method for high frequency underway N 2 fixation measurements: Flow-through incubation Acetylene Reduction Assays by Cavity ring down laser Absorption Spectroscopy (FARACAS) ArchiMer
Cassar, Nicolas; Tang, Weiyi; Gabathuler, Hans; Huang, Kuan.
Because of the difficulty in resolving the large variability of N2 fixation with current methods which rely on discrete sampling, the development of new methods for high resolution measurements is highly desirable. We present a new method for high-frequency measurements of aquatic N2 fixation by continuous flow-through incubations and spectral monitoring of the acetylene (C2H2, a substrate analog for N2) reduction to ethylene (C2H4). In this method, named “Flow-through incubation Acetylene Reduction Assays by Cavity ring-down laser Absorption Spectros-copy” (FARACAS), dissolved C2H2 is continuously admixed with seawater upstream of a continuous-flow stirred-tank reactor (CFSR) in which C2H2 reduction takes place. Downstream of the flow-through incubator,...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00420/53139/54103.pdf
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A method to address the non-random spatial distribution of on-board observer data to map landings and discards ArchiMer
Pointin, Fabien; Cornou, Anne-sophie; Prod'Homme, Romain; Taupin, Nicolas; Rochet, Marie-joelle.
he Landing Obligation is legislation meant to gradually reduce discards in European fisheries from 2015. Identifying spatial patterns of landings and discards is an important element in mitigating the effects of this legislation on fishing activity. On-board observer data have already been used to address this issue based on models involving statistical assumptions in relation to the non-random spatial distribution of data, which may cause errors in the parameters of interest. An alternative non-model-based mapping method using nested grids is applied to explore the spatial distribution of landings and discards for two French fishing métiers in the Celtic Sea and western English Channel from 2011 to 2016. The grid fineness and the estimate precision are...
Tipo: Text Palavras-chave: Landings; Discards; On-board observer data; Nested grid; Fishing metier.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00409/52021/52856.pdf
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A methodological proposal for the recovery of palynomorphs from snow and ice samples Acta Botanica
Rodrigues,Luiz Antonio da Costa; Agostini,Kamila da Matta; Alencar,Alexandre Santos de; Mendonça,Cláudia Barbieri Ferreira; Carvalho,Marcelo Araújo de; Gonçalves-Esteves,Vania.
ABSTRACT The procedures for a set of techniques to recover grains of pollen 26 and spores from liquid samples are described. Liquefied samples of matrices, such as melting lakes, snow and ice, can provide a record of climatic and environmental events at different geographic and temporal scales. The need for standardization of techniques was demonstrated in research carried out with matrices of snow and water of thawing lakes and snow collected on King George and Joinville islands (Antarctica). The use of the methods described can permit increased rescue of palynomorphs from liquid matrices, thereby adding greater reliability to palynological data and its use as a biotracer of environmental events. Methods of sieving and centrifugation were tested, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; Ice; Spores; Snow; Technique to recover grains of pollen.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400667
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A model perspective on the dynamics of the shadow zone of the eastern tropical North Atlantic - Part 1: the poleward slope currents along West Africa ArchiMer
Kounta, Lala; Capet, Xavier; Jouanno, Julien; Kolodziejczyk, Nicolas; Sow, Bamol; Gaye, Amadou Thierno.
The West African seaboard is one of the upwelling sectors that has received the least attention, and in situ observations relevant to its dynamics are particularly scarce. The current system in this sector is not well known and understood, e.g., in terms of seasonal variability, across-shore structure, and forcing processes. This knowledge gap is addressed in two studies that analyze the mean seasonal cycle of an eddy-permitting numerical simulation of the tropical Atlantic. Part 1 is concerned with the circulation over the West African continental slope at the southernmost reach of the Canary Current system, between similar to 8 and 20 degrees N. The focus is on the depth range most directly implicated in the wind-driven circulation (offshore and coastal...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00458/56969/58862.pdf
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A multidisciplinary approach to the spatial dimension in ecosystem-based fisheries management ArchiMer
Le Floc'H, Pascal; Bertignac, Michel; Curtil, Olivier; Macher, Claire; Mariat-roy, Emilie; Paulet, Yves-marie.
This study considers how to reconcile different spatial scales to find the best common denominator to be used as an ecosystem-based management unit. For this, two fishery production zones differing ecologically, economically, legally and institutionally were investigated. The first case study is located within French territorial waters, in a MPA created in 2007- the Parc Naturel Marin d'Iroise (PNMI). The second case study, the Bay of Biscay, covers both territorial waters and the French exclusive economic zone. The paper adopts a multidisciplinary approach. Relevant questions concern how marine space is shared between exploited species and fishing fleets, especially the spatial mobility strategies they employ. An assessment of the institutional system...
Tipo: Text Palavras-chave: Spatial scale; Ecosystem-based fisheries management; Marine protected area; Socio-system.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00460/57191/59156.pdf
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A multimetric-index approach using fisheries data to assess fish assemblage structure in relation to salinity gradient in a tropical West African estuary ArchiMer
Kantoussan, J.; Ecoutin, J. M.; Lae, R.; Thiaw, O. T.; Tito De Morais, L..
This study examines the effects of increasing salinity on fish assemblage structure in the Casamance Estuary, Senegal. using a series of indices. The study data were derived from commercial fishery surveys conducted between April and July 2005. Analysis of within-trophic-group diversity in the Casamance Estuary shows a significant drop in the diversity of apex predators in the upper. more saline reaches of the estuary. By contrast. primary consumers adapted well to salinity changes and exhibited higher taxonomic diversity in the upper reaches of the estuary than in the lower reaches. The findings also indicate decreases in average sizes of the landed species and the trophic levels among fish catches in the direction of the upper reaches. However, the catch...
Tipo: Text Palavras-chave: Biological indicators; Casamance Estuary; Ecosystem monitoring; Fishery statistics; Inverse hypersaline estuary; Senegal; Taxonomic diversity.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00451/56222/57945.pdf
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A Multy-Year Study Reveals the Importance of Residual Herbicides on Weed Control in Glyphosate-Resistant Soybean Planta Daninha
NUNES,A.L.; LORENSET,J.; GUBIANI,J.E.; SANTOS,F.M..
ABSTRACT: A 3-year field study was conducted to assess the potential for using pre-emergent (PRE) herbicides tank mixed with glyphosate as a means of controlling weed species in soybean. In 2011/12, 2012/13 and 2013/14 growing sessions soybean cultivar Brasmax Apollo RR was planted under residues of rye. The herbicide treatments glyphosate (gly) (1,296 g a.i. ha-1), gly + S-metolachlor (1,296 + 1,920), gly + imazaquin (1,296 +161), gly + pendimethalin (1,296 + 1,000), gly + metribuzin (1,296 + 480), gly + 2.4-D amine (1,296 + 1,209) was applied in pre-emergence (PRE) over rye crop residues two days before soybean sowing. In addition, full season weed-free and weedy control plots were included. Gly + S-metolachlor and gly + pendimethalin reduced the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; 2.4-D; Metribuzin; S-metolachlor; Conyza spp.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100239
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A Nematode of the Mid-Atlantic Ridge Hydrothermal Vents Harbors a Possible Symbiotic Relationship ArchiMer
Bellec, Laure; Cambon-bonavita, Marie-anne; Cueff-gauchard, Valerie; Durand, Lucile; Gayet, Nicolas; Zeppilli, Daniela.
Deep-sea hydrothermal vent meiofauna have been the focus of recent research and the discovery of an abundant well-adapted free-living marine nematode on the Mid-Atlantic Ridge offers new perspectives on adaptations to the vent environment. Indeed, knowledge concerning biological interactions of microbes and meiofauna in marine extreme environments is scarce, especially for nematodes. In this study, we used microscopic observations [fluorescence in situ hybridization (FISH) and scanning electron microscopy (SEM)] and metabarcoding of 16S rRNA to characterize the bacterial community of the nematode species Oncholaimus dyvae, an overlooked but ecologically important vent organism. Detection of bacteria in the buccal cavity and on the cuticle (SEM) and...
Tipo: Text Palavras-chave: Sulfur-oxidizing bacteria; Lucky Strike vent field; Meiofauna; Nematode; Endosymbiont.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00457/56846/58676.pdf
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A new characterization of the Euclidean sphere Anais da ABC (AABC)
BARROS,ABDÊNAGO A.; AQUINO,CÍCERO P.; GOMES,JOSÉ N.V..
Abstract In this paper, we obtain a new characterization of the Euclidean sphere as a compact Riemannian manifold with constant scalar curvature carrying a nontrivial conformal vector field which is also conformal Ricci vector field.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conformal vector field; Scalar curvature; Euclidean sphere; Einstein manifold.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602663
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A new Costa Rican species of Drosophila visiting inflorescences of the hemi-epiphytic climber Monstera lentii (Araceae) Rev. Bras. entomol.
Vilela,Carlos R.; Prieto,Danyi.
ABSTRACT Drosophila monsterae sp. nov. is described from 11 males and 13 females collected from the inside of closed inflorescences of Monstera lentii (Araceae) at 1810 m altitude in the Forest Reserve of Cerro de La Carpintera, Canton La Unión, Province of Cartago, Costa Rica. Although flies have been seen wandering and copulating inside the floral chambers of closed inflorescences during the floral female phase, eggs or larvae have not yet been found either in the spathe or in the fleshy spadix. The new species is related to Drosophila tristani Sturtevant, 1921, from San José, Costa Rica, from which it differs mainly by having smaller slightly circular compound eyes, distinctly broader genae (cheek index ca. 2.4 vs 5 in D. tristani), and the inner...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aroid; Central America; Drosophilinae; Taxonomy.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000300225
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A new coumarin derivative, 4-acetatecoumarin, with antifungal activity and association study against Aspergillus spp. BJM
Guerra,Felipe Q.S.; Araújo,Rodrigo S.A.; Sousa,Janiere P.; Silva,Viviane A.; Pereira,Fillipe O.; Mendonça-Junior,Francisco J.B.; Barbosa-Filho,José M.; Pereira,Julio Abrantes; Lima,Edeltrudes O..
Abstract Fungal infections have become a concern for health professionals, and the emergence of resistant strains has been reported for all known classes of antifungal drugs. Among the fungi causing disease, we highlight those that belong to the genus Aspergillus. For these reasons, the search for new antifungals is important. This study examines the effects of a coumarin derivative, 4-acetatecoumarin (Cou-UMB16) both alone and together with antifungal drugs, and its mode of action against Aspergillus spp. Cou-UMB16 was tested to evaluate its effects on mycelia growth, and germination of Aspergillus spp. fungal conidia. We investigated its possible action on cell walls, on the cell membrane, and also the capacity of this coumarin derivative to enhance the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coumarin; Antifungal activity; A. flavus; A. fumigatus; Mode of action.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000200407
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A New Coupled Ocean-Waves-Atmosphere Model Designed for Tropical Storm Studies: Example of Tropical Cyclone Bejisa (2013-2014) in the South-West Indian Ocean ArchiMer
Pianezze, J.; Barthe, C.; Bielli, S.; Tulet, P.; Jullien, Swen; Cambon, Gildas; Bousquet, O.; Claeys, M.; Cordier, E..
Ocean-Waves-Atmosphere (OWA) exchanges are not well represented in current Numerical Weather Prediction (NWP) systems, which can lead to large uncertainties in tropical cyclone track and intensity forecasts. In order to explore and better understand the impact of OWA interactions on tropical cyclone modelling, a fully coupled OWA system based on the atmospheric model Meso-NH, the oceanic model CROCO and the wave model WW3 and called MSWC was designed and applied to the case of tropical cyclone Bejisa (2013-2014). The fully coupled OWA simulation shows good agreement with the literature and available observations. In particular, simulated significant wave height is within 30 cm of measurements made with buoys and altimeters. Short-term (< 2 days)...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00428/53983/55169.pdf
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A new diatom species P. hallegraeffii sp. nov. belonging to the toxic genus Pseudo-nitzschia (Bacillariophyceae) from the East Australian Current ArchiMer
Ajani, Penelope A.; Verma, Arjun; Lassudrie, Malwenn; Doblin, Martina A.; Murray, Shauna A..
A new species belonging to the toxin producing diatom genus Pseudo-nitzschia, P. hallegraeffii sp. nov., is delineated and described from the East Australian Current (EAC). Clonal cultures were established by single cell isolation from phytoplankton net hauls collected as part of a research expedition in the EAC region in 2016 on the RV Investigator. Cultures were assessed for their morphological and genetic characteristics, their sexual compatibility with other Pseudo-nitzschia species, and their ability to produce domoic acid. Light and transmission electron microscopy revealed cells which differed from their closest relatives by their cell width, rows of poroids, girdle band structure and density of band straie. Phylogenetic analyses based on sequencing...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00436/54794/56248.pdf
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A new genus, Desertispora, and a new species, Diversispora sabulosa, in the family Diversisporaceae (order Diversisporales, subphylum Glomeromycotina) Organic Eprints
Symanczik, Sarah; Al-Yahya'ei, Mohamed N.; Kozłowska, Anna; Ryszka, Przemysław; Błaszkowski, Janusz.
Phylogenetic analyses of sequences of the SSU–ITS–LSU nrDNA segment and the RPB1 gene showed that the arbuscular mycorrhizal fungus originally described as Diversispora omaniana does not belong to the genus Diversispora, but represents a separate clade at the rank of genus in the family Diversisporaceae of the order Diversisporales. The closest natural relatives of the fungus proved to be species of the genera Corymbiglomus and Redeckera. Consequently, the new genus was named Desertispora, and Di. omaniana was renamed De. omaniana comb. nov. In addition, the morphological and histochemical features of spores and mycorrhizal structures of a new Diversispora sp., Di. sabulosa, were described and the closest relatives of the species were determined based on...
Tipo: Journal paper Palavras-chave: Soil Crop health; Quality; Protection.
Ano: 2018 URL: http://orgprints.org/33351/1/Symanczik-etal-2017_MyologicalProgress_Vol17_Issue4_pp437-449.pdf
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A new genus from Vietnam (Hymenoptera, Braconidae, Opiinae), and the description of two new species Naturalis
Wu, Q.; Achterberg, C. van; Sheng, Y-y.; Chen, X-x..
Two aberrant species of Opiinae are described and illustrated from Vietnam, of which one is included into a new genus (Canalopius gen. n.; type species: C. periscopus sp. n.). The other species, Xynobius chrysops sp. n. belongs to an aberrant group of species near X. maculipennis (Enderlein, 1912).
Tipo: Article / Letter to the editor Palavras-chave: Braconidae; Opiinae; Canalopius; Xynobius; New genus; New species; Oriental; Vietnam.
Ano: 2018 URL: http://www.repository.naturalis.nl/record/679650
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A new host for Philornis torquans (Diptera, Muscidae) from the Brazilian Cerrado Pap. Avulsos de Zool. (São Paulo)
Couri,Márcia Souto; Barbosa,Leandro; Marini,Miguel Ângelo; Duca,Charles; Pujol-Luz,José Roberto.
Abstract Philornis larvae and pupae were collected in nestlings of Neothraupis fasciata (Lichtenstein), the White-banded Tanager (Passeriformes, Thraupidae), in three breeding seasons, between October and November 2003-2005 in a reserve in central Brazil. Here, we present biological data, diagnosis to the recognition of the species and a key to the segregation of species occurring in the Cerrado. The larvae were intradermic in the nestlings and the pupae were collected in the nests after the birds have abandoned them. The immatures collected were taken to the laboratory and reared under laboratory conditions, until emergence. The species identified as Philornis torquans (Nielsen), is here firstly recorded from the Brazilian Cerrado, and firstly recorded...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Larvae; Cerrado vegetation; Myiasis; New record; Parasites.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492018000100255
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A new key for the species of Ateuchus Weber (Coleoptera: Scarabaeidae: Scarabaeinae) occurring in Mexico, with a description of the first North American inquiline species from a rodent burrow (Rodentia: Geomydae) and new distribution records Rev. Bras. entomol.
Kohlmann,Bert; Vaz-de-Mello,Fernando Z..
Abstract The first Ateuchus Weber (Scarabaeinae) species, A. tuza sp. nov., from a rodent burrow from North America is described. Diagnostic characters are presented; photographs of an adult male and illustrations of male genitalia are included. A key for all known Mexican Ateuchus Weber species is provided. Ateuchus hornai (Balthasar) is revalidated. New distribution records from Mexico and Central America are reported.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Internal sac; Neotropical region; Scarabaeoidea; Taxonomy; Veracruz.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000200131
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A new methodology for large-scale screening sugarcane resistance to Mahanarva Fimbriolata (Hemiptera: Cercopidae) Bragantia
Valverde,Alejandro Hipólito Pabón; Soares,Bruno Oliveira; Tomaz,Adriano Cirino; Pimentel,Guilherme Vieira; Peternelli,Luiz Alexandre; Barbosa,Márcio Henrique Pereira.
ABSTRACT The sugarcane spittlebug, Mahanarva fimbriolata (Walker) (Hemiptera: Cercopidae) is an economically important pest of sugarcane in Brazil. The purpose of this study was to develop and validate a greenhouse methodology to screen large sugarcane populations for resistance to spittlebug Mahanarva fimbriolata. A resistant and a susceptible genotype (H. Kawandang and SP81-3250) were first used to determine adequate days after infestation and levels of infestation (number of nymphs per plant) for comparing the resistance of genotypes. Then, 74 sugarcane genotypes including three susceptible and three resistant controls were screened for resistance. The screening method consists in infesting single-tiller plants supported in a small plant growth unit and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Saccharum sp; Spittlebug; Plant-insect interaction; Nymph damage.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000400599
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A new mouth brooder species of Gymnogeophagus with hypertrophied lips (Cichliformes: Cichlidae) Neotropical Ichthyology
Turcati,Andréia; Serra-Alanis,Wilson Sebastián; Malabarba,Luiz R..
ABSTRACT A new mouth breeder species of Gymnogeophagus is described from a tributary of the río Uruguay. It is distinguished from most species of the genus by the presence of hypertrophied lips, and from G. labiatus and G. pseudolabiatus by the color pattern. The presence of successive allopatric species of the Gymnogeophagus gymnogenys clade inhabiting the tributaries of the río Uruguay is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Distribution; Endemism; Gymnogeophagus gymnogenys clade; New species; Río Uruguay.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400218
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A new species and a key for the Brazilian species of the genus Heterelmis Sharp, 1882 (Coleoptera: Elmidae, Elminae) Pap. Avulsos de Zool. (São Paulo)
Polizei,Thiago Tadeu Silva.
Abstract Heterelmis Sharp, 1882, comprises 22 species and subspecies with 3 species assigned to Brazil so far. Here the forth species, Heterelmis debilis sp. nov. from Brazil, is described and illustrated. The type material is deposited in the Museum of Zoology of the University of São Paulo, São Paulo, Brazil (MZSP) and Natural History Museum, London, UK (NHMUK). Additionally, an identification key with distributional data for Brazilian species is proposed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic beetles; Riffle Beetles; Neotropical; South America; Taxonomy.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492018000100219
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