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| Registros recuperados: 35 | |
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| 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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| 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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| 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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| 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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| Verryckt, Lore T.; Van Langenhove, Leandro; Ciais, Philippe; Courtois, Elodie A.; Vicca, Sara; Peñuelas, Josep; Stahl, Clément; Coste, Sabrina; Ellsworth, David S.; Posada, Juan M.; Obersteiner, Michael; Chave, Jérôme; Janssens, Ivan A.. |
| Measuring leaf gas exchange from canopy leaves is fundamental for our understanding of photosynthesis and for a realistic representation of carbon uptake in vegetation models. Since canopy leaves are often difficult to reach, especially in tropical forests with emergent trees up to 60 m at remote places, canopy access techniques such as canopy cranes or towers have facilitated photosynthetic measurements. These structures are expensive and therefore not very common. As an alternative, branches are often cut to enable leaf gas exchange measurements. The effect of branch excision on leaf gas exchange rates should be minimized and quantified to evaluate possible bias. We compared light‐saturated leaf net photosynthetic rates measured on excised and intact... |
| Tipo: Text |
Palavras-chave: Branch cutting; Canopy physiology; French Guiana; Gas exchange; Photosynthesis; Rainforest; Stomatal conductance. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00613/72466/71949.pdf |
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| Abascal-zorrilla, Noelia; Vantrepotte, Vincent; Huybrechts, Nicolas; Ngoc, Dat Dinh; Anthony, Edward J.; Gardel, Antoine. |
| The estuarine turbidity maximum (ETM) zone occurs in river estuaries due to the effects of tidal dynamics, density-driven residual circulation and deposition/erosion of fine sediments. Even though tropical river estuaries contribute proportionally more to the sediment supply of coastal areas, the ETM in them has been hardly studied. In this study, surface suspended particulate matter (SPM) determined from OLI (Operational Land Imager)-Landsat 8images was used to gain a better understanding of the spatio-temporal dynamics of the ETM of the tropical Maroni estuary (located on the Guianas coast, South America). A method to estimate the remotely-sensed ETM location and its spatiotemporal evolution between 2013 and 2019 was developed. Each ETM was defined from... |
| Tipo: Text |
Palavras-chave: Estuarine turbidity maximum; Landsat-8; Tropical estuary; Mud banks; French Guiana. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75263/75468.pdf |
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| 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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| 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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| 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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| 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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| 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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| Registros recuperados: 35 | |
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