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Registros recuperados: 29
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A test of community assembly rules using foliar endophytes from a tropical forest canopy ArchiMer
Donald, Julian; Roy, Mélanie; Suescun, Uxue; Iribar, Amaia; Manzi, Sophie; Péllissier, Léonie; Gaucher, Philippe; Chave, Jérôme.
1.Community assembly theory assumes that ecological communities are spatially delimited into patches. Within these patches, coexistence results from environmental filtering, competition, and immigration. Truly delineated communities exist in laboratory studies of microbial cultures in Petri dishes, yet empirical tests conducted in continuous environments often use patches defined by convention as opposed to realised boundaries. 2.Here we perform a test of ecological community assembly rules using foliar endophyte communities from a tropical rainforest, where leaves are considered as patches for both fungal and bacterial communities. We determined the diversity of fungal and bacterial endophytes using environmental DNA sequencing of 365 top‐canopy leaves,...
Tipo: Text Palavras-chave: Bacteria; Distribution; French Guiana; Fungi; Metabarcoding; Plant–pathogen interactions; Rainforest.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00606/71808/70296.pdf
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Amélioration des techniques d'élevage de la chevrette Macrobrachium rosenbergii en Guyane ArchiMer
Griessinger, Jean-michel; Gondouin, Philippe; Dutto, Gilbert; Lacroix, Denis; Pollet, Thierry; Falguiere, Jean-claude; Mer, Gilles.
En 1987, l'analyse du système d'élevage en continu menée par l' IFREMER tant sur les fermes guyanaises que sur la station expérimentale de Kourou a permis de mettre en évidence les limites et les faiblesses de ce mode d'élevage. Elle a montré la nécessité d'un meilleur contrôle du cheptel depuis l'ensemencement jusqu'à la commercialisation afin de pouvoir atteindre de manière fiable des rendements de l'ordre de 2,5 T/ha/an.
Tipo: Text Palavras-chave: Elevage; Chevrette; Macrobrachium rosenbergii; Guyane; Zootechnie; Production; Grow-out; Freshwater prawn; Macrobrachium rseenbergii; French Guiana; Production.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00041/15266/12618.pdf
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An unusual new species of Guatteria (Annonaceae) from French Guiana and adjacent Brazil (Amapá) Naturalis
Scharf, U.; Maas, P.J.M.; Prévost, M.F..
During a taxonomic treatment of Annonaceae for the Flora of the Guianas project, an unusual new species of Guatteria Ruiz & Pav., G. anteridifera from French Guiana and Amapá in Brazil (Northern South America) was found and described herein.
Tipo: Article / Letter to the editor Palavras-chave: Annonaceae; Guatteria; Tropical South America; French Guiana; Taxonomy.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/525074
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Annotated checklist of the herpetofauna of Petit Saut, Sinnamary River, French Guiana Naturalis
Hoogmoed, M.S.; Avila-Pires, T.C.S..
The Mission Radeau des Cimes to Petit Saut, French Guiana, offered the opportunity to study the herpetofauna of the canopy of the tropical rainforest, an area hardly studied sofar. Two localities at heights of 30 and 35 m could be studied, whereas data on a third site were obtained through information from other participants. The herpetological results of the research in the canopy were meagre. Only the frog Hyla leucophyllata (Beireis) and the lizard Mabuya bistriata (Spix) were observed in the canopy. Additionally the terrestrial herpetofauna was studied extensively and turned out to contain some species that had not been reported before from French Guiana. Also, for many species new distribution data within French Guiana were obtained. Le Mission Radeau...
Tipo: Article / Letter to the editor Palavras-chave: Reptilia; Amphibia; Tropical rainforest; Canopy; Forest floor; Neotropics; French Guiana; 42.82.
Ano: 1991 URL: http://www.repository.naturalis.nl/record/318446
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Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America ArchiMer
Aschenbroich, Adelaide; Michaud, Emma; Stieglitz, Thomas; Fromard, Francois; Gardel, Antoine; Tavares, Marcos; Thouzeau, Gerard.
This study in French Guiana evaluates the changes of crab assemblages and their bioturbation activities between mangrove early stages (pioneer and young mangrove) and within stages by taking their spatial heterogeneity (tidal channels, flat areas, pools) into account. The results show differences in crab assemblage structure between and within the early stages of mangrove in relation to microhabitat and sediment characteristics. The sediment reworking rates are a function of the biomass or density of particular species (Ucides cordatus, Uca cumulanta) and burrower functional groups. Crab species or functional interaction mediate changes in sediment reworking rates suggesting the need to consider entire benthic communities rather than single species. This...
Tipo: Text Palavras-chave: Mangroves; Crabs; Community composition; Bioturbation; French Guiana; Amazon.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00350/46154/45852.pdf
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Comments on the type specimen of Dracaena guianensis Daudin, 1801 (Reptilia: Sauria: Teiidae), and rediscovery of the species in French Guiana Naturalis
Massary, J.-C. de; Hoogmoed, M.S.; Blanc, M..
A discussion on the whereabouts of the holotype of Dracaena guianensis is given, and its rediscovery in the National Museum of Natural History, Leiden, The Netherlands (RMNH) and the Muséum national d’Histoire naturelle, Anatomie Comparée, Paris, France (MNHN-AC) is reported. The RMNH possesses a stuffed specimen, of which the left forelimb has been amputated in life and of which the skull is no longer present in the specimen. The Paris museum possesses a skull that fits the Leiden specimen. Thus, the stuffed specimen and the skull together form the complete holotype, each object can be considered a “schizotype” of the holotype. After one of us observed the species again in French Guiana and documented this with a picture, the correction of the type...
Tipo: Article / Letter to the editor Palavras-chave: Dracaena; Holotype; Rediscovery; Type locality; Range extension; French Guiana; 42.82.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/215740
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Enzymatic polymorphism study as help for constitution of initial broodstock for a new cultivated finfish species. ArchiMer
Renno, J; Luquet, P.
Leporinus friderici is a South American promising species for fish culture. In French Guiana the "morphological species", L. friderici, L. granti, L. lebaili and L. affinis steyermarki are found. Their identification is sometimes difficult on usual criterion. To constitute an initial broodstock of L. friderici from local wild populations, the genetic structure of these species was studied. Fifteen enzyme systems, representing twenty loci, were screened.
Tipo: Text Palavras-chave: French Guiana; Leporinus; Leporinus granti; Leporinus friderici; Anostomidae; Pisces; Embryos; Mortality; Genetics; Freshwater fish; Rearing; Breeding; Biopolymorphism; Brood stocks; Enzymatic activity.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-1441.pdf
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Etude de la variation des paramètres biomasse (Chla) et turbidité sur plus de 10 années dans les eaux marines guyanaises par imagerie satellite. - Phase 2 : utilisation de la résolution à 300 m ArchiMer
Lampert, Luis; Bryere, Philippe; Gohin, Francis.
On the extremely turbid waters of French Guyana, the high-resolution satellite imagery (300 m) seems a very good tool for monitoring coastal and estuarine waters. It is possible to adjust the algorithms and calculation methods to be in the range of values suggested by in-situ measurements and thus, have the long data series, where P90chla and P90turbi parameters can be calculated on the MEC.
Tipo: Text Palavras-chave: Guyane française; Images satellite; Turbidité; Chlorophylle; P90; MEC; MET; DCE; French Guiana; Satellite imagery; Turbidity; Chlorophyll; P90; MEC; MET; DCE.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00369/47992/48020.pdf
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Five new species of Guatteria (Annonaceae) from French Guiana, Guyana and Suriname Naturalis
Scharf, U.; Maas, P.J.M.; Morawetz, W..
As a precursor to a taxonomic treatment of Annonaceae for the Flora of the Guianas project, five new species of Guatteria Ruiz & Pav. from French Guiana, Guyana and Suriname (Northern South America) are described here.
Tipo: Article / Letter to the editor Palavras-chave: Annonaceae; Guatteria; Tropical South America; French Guiana; Guyana; Suriname; Taxonomy.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/526224
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Four new combinations in Chomelia and Stenostomum (Rubiaceae, Guettardeae) from Central America, the Guianas and the Amazon Basin Naturalis
Delprete, P.G.; Achille, F.; Mouly, A..
According to current generic delimitations, supported by wood anatomy, palynology, and recent molecular phylogenies, Antirhea, traditionally treated as a Pantropical genus, is instead restricted to the Paleotropics. At the same time, the Neotropical species traditionally positioned in Antirhea should be positioned in Stenostomum. Following these definitions, Stenostomum is a genus with most of the species present in the Caribbean Region, and two species present in the Guianas, namely S. acreanum and S. guianensis, distributed throughout the Amazon Basin. In addition, according to these new generic delimitations, two species previously positioned in Guettarda and Antirhea need to be transferred to Chomelia, as C. triflora and C. ulei.
Tipo: Article / Letter to the editor Palavras-chave: Amazon Basin; Chomelia; Floristics; French Guiana; Guettarda; Guettardeae; Guyana; Rubiaceae; South America; Stenostomum; Taxonomy.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/525264
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Géochimie du mercure dans le continuum de la retenue de Petit-Saut et de l'estuaire du Sinnamary, Guyane française ArchiMer
Muresan Paslaru, Bogdan.
The mercury cycle was explored in the Petit-Saut reservoir / Sinnamary Estuary continuum in French Guiana. Main processes involve (i) photo-induced reduction, (ii) adsorption and desorption at the particle surfaces, (iii) methylating bacterial activity, (iv) precipitation and dissolution of iron oxyhydroxides and sulfides. Sources of mercury to the Petit-Saut reservoir consist of the partly impacted river-tributaries, the atmospheric deposition and the flooded soils or vegetation. Once into the reservoir, divalent mercury undergoes a large spectrum of transformations including speciation and phase changes. We, here, probe these processes and demonstrate that the Petit-Saut reservoir behaves as a privileged site for atmospheric recycling and in situ...
Tipo: Text Palavras-chave: Atmosphere; Estuary; Reservoir; French Guiana; Methylmercury; Mercury; Atmosphère; Estuaire; Retenue; Guyane française; Methylmercure; Mercure.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-1508.pdf
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Geographic distribution of Hemigrammus ora (Ostariophysi: Characiformes: Characidae) in the Amazon basin, Brazil Rev. Bras. Zool.
Jerep,Fernando C; Carvalho,Fernando R; Bertaco,Vinicius A.
New records of Hemigrammus ora Zarske, Le Bail & Géry, 2006, previously believed to be endemic to the French Guiana drainages, are confirmed for Brazilian drainages. The species is reported from the Tocantins-Araguaia system and lower Amazon River. Morphometric and meristic data, previously undescribed morphological traits related to caudal-fin squamation and anal-fin hooks, and geographic variation are presented for the species.
Tipo: Info:eu-repo/semantics/other Palavras-chave: French Guiana; Tocantins-Araguaia River basin; Guyana shield; Brazilian shield.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000400019
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Guatteria richardii (Annonaceae) rediscovered along with two new species from French Guiana Naturalis
Scharf, U.; Maas, P.J.M.; Morawetz, W..
For the first time, 140 years after the collection of the first specimen and 70 years after the description of Guatteria richardii R.E. Fr. from French Guiana, more specimens that are referable to this species were discovered during a taxonomic treatment for the Flora of the Guianas project, concerning Guatteria Ruiz & Pav. (Annonaceae). In addition, G. intermedia and G. montis-trinitatis, two similar species – the first widely distributed and the second endemic to the Montagne de la Trinité in French Guiana, are described as new to science.
Tipo: Article / Letter to the editor Palavras-chave: Annonaceae; Guatteria; Tropical South America; Guayana Shield; Brazil; French Guiana; Suriname; Taxonomy.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/525900
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Heavy metals distribution in mangrove sediments along the mobile coastline of French Guiana ArchiMer
Marchand, Cyril; Lallier Verges, E; Baltzer, F; Alberic, P; Cossa, Daniel; Baillif, P.
The accumulation of nine heavy metals in fine-grained sediments from the mangrove fringed coast of French Guiana is evaluated. The dynamic features of the South American tropical coastline, from the Amazon to the Orinoco Rivers, result in mangrove sediments being alternately submitted to phases of erosion and net sedimentation a few tens of years long. This process influences the distribution of the heavy metals associated with these frequently re-mobilized deposits. Sedimentary cores and mangrove plant samples were collected, at different seasons, in various swamps characterized by different properties (content of sedimentary organic matter, distance from sea water and fresh water). The ranges of measured concentrations expressed in mu mol g(-1) were the...
Tipo: Text Palavras-chave: French Guiana; Mangrove; Fe/Mn cycling; Heavy metals.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1041.pdf
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Hunting in French Guiana Across Time, Space and Livelihoods ArchiMer
Richard-hansen, Cecile; Davy, Damien; Longin, Guillaume; Gaillard, Laurent; Renoux, François; Grenand, Pierre; Rinaldo, Raphaëlle.
Hunting sustainability in Amazonian ecosystems is a key challenge for modern stakeholders. Predictive models have evolved from first mostly biological data-based to more recent modeling including human behavior. We analyze here the hunting data collected in French Guiana through a panel of indices aiming at drawing the puzzle of parameters influencing hunting activity and impact in various socio ecological conditions across the country. Data were collected from five different study sites differing in cultural origins and remoteness from market economy, and over a 10 years period. Most indices show an impact on wildlife populations, and using a full set of indicators allowed us to better understand some underlying mechanisms that lead to a community's...
Tipo: Text Palavras-chave: Sustainable hunting; French Guiana; Indices; Livelihoods; Diachronic.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00606/71806/70294.pdf
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Increasing diversity in the species-rich genus Guatteria (Annonaceae) Naturalis
Erkens, R.H.J.; Westra, L.Y.Th.; Maas, P.J.M..
During a taxonomic treatment of Annonaceae for the Flora of the Guianas project, an unusual new species of Guatteria Ruiz & Pav., G. anteridifera from French Guiana and Amapá in Brazil (Northern South America) was found and described herein.
Tipo: Article / Letter to the editor Palavras-chave: Annonaceae; Guatteria; Tropical South America; French Guiana; Taxonomy.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/525906
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Late quaternary paleoceanography of the French Guiana continental shelf: Clay-mineral evidence ArchiMer
Pujos, M; Latouche, C; Maillet, N.
Marine muds deposited on the French Guiana coast mostly originate in the Amazon. Recent sediments are composed of (a) illite (33 %) and chlorite (13 %) of Andean mountain origin; and (b) kaolinite (28 %) and smectite (26 %), principally from the Amazonian lowlands but also from the Guiana Shield. In the coastal mud prism, high-resolution seismic profiles, together with sedimentological, micropaleontological and soil engineering studies, supplemented by C-14 dates, permitted a stratigraphic interpretation of eight cores. Three episodes have been determined on the basis of clay-mineral variations related to Amazonian lowland, Andean and Guiana shield sources. The older episodes 3 (3000-1700 y BP) and 2 (1700-1000 y BP) are predominantly characterized by...
Tipo: Text Palavras-chave: Late quaternary; French Guiana; Shelf; Clay minerals; ENSO.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00094/20506/18175.pdf
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Les minéraux lourds des sables du littoral de la Guyane française : bilan sur l’origine des dépôts de la plate-forme des Guyanes ArchiMer
Pujos, M; Pons, Jc; Parra, M.
The distribution of heavy minerals on beaches and beach ridges sands of French Guiana shows three distinct suites from East to West: amphibole (largely dominant), staurolite, epidote and pyroxene off the Cayenne region, tourmaline and amphibole mainly off the Kourou-Mana, garnet, staurolite and tourmaline off the Mana-Maroni. A very good continuity exists between the assemblages of heavy minerals from the catchment area parent-rocks, the fluviatile sediments, the coastal zone and the shelf. The results of this study indicate and strengthen a local origin for the sandy sediments and do not support a possibility of an Amazonian source.
Tipo: Text Palavras-chave: Guyane française; Plages; Cordons sableux; Minéraux lourds; French Guiana; Beaches; Beach ridges sands; Heavy minerals.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00291/40271/38643.pdf
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Lithoxus stocki, a species new to science of ancistrin loricariid catfish from the Maroni River drainage, with a comparison of the primary type specimens of the six species of Lithoxus (syn.: Paralithoxus) (Pisces, Siluriformes, Loricariidae) Naturalis
Nijssen, Han; Isbrücker, Isaäc J.H..
Lithoxus stocki, a catfish species new to science from the Maroni River drainage in French Guiana and Surinam is described. A lectotype is designated for Lithoxus bovallii. Morphometric and meristic characters of the six species of the genus are provided. Paralithoxus, originally proposed as a subgenus of Lithoxus, is relegated to the synonymy of Lithoxus.
Tipo: Article / Letter to the editor Palavras-chave: Siluriformes; Lithoxus; French Guiana; Surinam.
Ano: 1990 URL: http://www.repository.naturalis.nl/record/504531
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Marine biodiversity in French Guiana: Estuarine, coastal, and shelf ecosystems under de influence of Amazonian waters Gayana
Artigas,Luis Felipe; Vendeville,Philippe; Leopold,Marc; Guiral,Daniel; Ternon,Jean-François.
Marine biodiversity in French Guiana is strongly influenced by the amagon River waters of the river Amazon, which constitute a major structuring factor for the estuarine, coastal, and shelf marine ecosystems. Moreover, the marked seasonal and interannual variabilities play important roles in the stability or fluctuations in the environmental parameters that influence biodiversity at the ecological, population, and genetic levels. Previous and ongoing studies of the marine and littoral biota relate mostly to commercial marine species, protected species in danger of extinction and, specially, to the biodiversity and functioning of local coastal and littoral ecosystems such as estuaries, mudflats, sandy beaches and, particularly, littoral mangroves. A more...
Tipo: Journal article Palavras-chave: French Guiana; Marine biodiversity; Coastal systems; Amazon river waters; Intertropical Convergence Zone; Ecological and conservation studies.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200013
Registros recuperados: 29
Primeira ... 12 ... Última
 

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