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Author Guitet, S.; Sabatier, D.; Brunaux, O.; Couteron, P.; Denis, T.; Freycon, V.; Gonzalez, S.; Hérault, B.; Jaouen, G.; Molino, J.-F.; Pélissier, R.; Richard-Hansen, C.; Vincent, G. pdf  url
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  Title Disturbance Regimes Drive the Diversity of Regional Floristic Pools Across Guianan Rainforest Landscapes Type Journal Article
  Year 2018 Publication Scientific Reports Abbreviated Journal Sci. Rep.  
  Volume 8 Issue Pages 3872  
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  Abstract Disturbances control rainforest dynamics, and, according to the intermediate disturbance hypothesis (IDH), disturbance regime is a key driver of local diversity. Variations in disturbance regimes and their consequences on regional diversity at broad spatiotemporal scales are still poorly understood. Using multidisciplinary large-scale inventories and LiDAR acquisitions, we developed a robust indicator of disturbance regimes based on the frequency of a few early successional and widely distributed pioneer species. We demonstrate at the landscape scale that tree-species diversity and disturbance regimes vary with climate and relief. Significant relationships between the disturbance indicator, tree-species diversity and soil phosphorus content agree with the hypothesis that rainforest diversity is controlled both by disturbance regimes and long-term ecosystem stability. These effects explain the broad-scale patterns of floristic diversity observed between landscapes. In fact, species-rich forests in highlands, which have benefited from long-term stability combined with a moderate and regular regime of local disturbances, contrast with less diversified forests on recently shaped lowlands, which have undergone more recent changes and irregular dynamics. These results suggest that taking the current disturbance regime into account and including geomorphological stratifications in climate-vegetation models may be an effective way to improve the prediction of changes in species diversity under climate change. © 2018 The Author(s).  
  Address AgroParisTech, EcoFoG, Kourou, French Guiana  
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  Notes Export Date: 21 March 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 798  
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Author Fontaine, S.; Stahl, C.; Klumpp, K.; Picon-Cochard, C.; Grise, M.M.; Dezécache, C.; Ponchant, L.; Freycon, V.; Blanc, L.; Bonal, D.; Burban, B.; Soussana, J.-F.; Blanfort, V.; Alvarez, G. doi  openurl
  Title Response to Editor to the comment by Schipper and Smith to our paper entitled 'Continuous soil carbon storage of old permanent pastures in Amazonia' Type Journal Article
  Year 2018 Publication Global Change Biology Abbreviated Journal Global Change Biology  
  Volume 24 Issue 3 Pages e732-e733  
  Keywords chronosequence study; continuous C accumulation; deep soil C; eddy covariance; grassland  
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  Notes Export Date: 28 February 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Fontaine_etal2018 Serial 796  
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Author Morel, H.; Lehnebach, R.; Cigna, J.; Ruelle, J.; Nicolini, É.; Beauchene, J. pdf  url
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  Title Basic wood density variations of Parkia velutina Benoist, a long-lived heliophilic Neotropical rainforest tree Type Journal Article
  Year 2018 Publication Bois et Forets des Tropiques Abbreviated Journal  
  Volume 335 Issue Pages 59-69  
  Keywords Curvilinear pattern; French Guiana; Intra-tree; Tropical species  
  Abstract Investigations of basic radial wood density (WD) in tropical trees revealed linear patterns and some curvilinear patterns. Studies usually disregard longitudinal variations, which are often considered to be similar to radial variations. This study aimed to show (1) a new radial curvilinear WD pattern, (2) differences in amplitude between radial and longitudinal gradients and (3) to partition WD variations according to different scales in Parkia velutina, an emergent tree found in Neotropical rain forests. We collected full discs from six felled trees and radial cores from 10 standing trees to check WD variability, plus one dominant axis per tree for analysis of height growth rates. This species showed very high growth rates indicative of heliophilic habits. WD varied from 0.194 to 0.642 g/cm3. Such amplitude is rarely observed within the same tree. Radial variation in WD was curvilinear, with an amplitude generally less than the longitudinal amplitude. Consequently, in mature trees, WD values in the crown were higher than those in the outer trunk. WD variations can be highly significant at different scales. The variance partitioning also revealed that the whole WD range of Parkia velutina is more accurately estimated intra-individually when both longitudinal and radial gradient are covered.  
  Address INRA, LERFoB, AgroParisTech, Nancy, France  
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  Notes Export Date: 20 April 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 799  
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Author Pétillon, J.; Leroy, B.; Djoudi, E.A.; Vedel, V. url  doi
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  Title Small and large spatial scale coexistence of ctenid spiders in a neotropical forest (French Guiana) Type Journal Article
  Year 2018 Publication Tropical Zoology Abbreviated Journal  
  Volume 31 Issue 2 Pages 85-98  
  Keywords Araneae; flooding; Guianese shield; inselberg; juveniles  
  Abstract While spiders constitute the most abundant and diverse arthropods in many habitats, they remained under-studied, especially in tropical rainforests. The goal of this study is to assess the spatial distribution of the spider family Ctenidae by assessing associations of species diversity and population traits among different habitat conditions. Fieldwork was carried out during 2013 in habitats varying in flooding frequency (plateau vs. flooded forest) and elevation (inselberg vs. lowland) in the Nouragues National Natural Reserve, French Guiana. Assemblage composition, population structure, and trait measurements of one dominant species were assessed using hand collection in replicated quadrats. We found strong effects on ctenid assemblages attributable to both elevation and flooding, with changes in relative abundance of species among habitats, but few correlated densities between species. At the population level, main differences in species distribution between and within habitats were detected only when juveniles were taken into account. No effect of elevation was found on the measurements of traits of the dominant species, but legs were proportionally shorter in flooded habitats, suggesting reduced active dispersal in these habitats. Our study highlights the value of complementary of measures of diversity and traits at different biological scales in Ctenidae.  
  Address UMR CNRS 8175 Ecologie des Forêts de Guyane, Université Antilles-Guyane, Kourou Cedex, Guyane Française, France  
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  Notes Export Date: 23 April 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 800  
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Author Ogeron, C.; Odonne, G.; Cristinoi, A.; Engel, J.; Grenand, P.; Beauchene, J.; Clair, B.; Davy, D. pdf  url
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  Title Palikur traditional roundwood construction in eastern French Guiana: Ethnobotanical and cultural perspectives Type Journal Article
  Year 2018 Publication Journal of Ethnobiology and Ethnomedicine Abbreviated Journal Journal of Ethnobiology and Ethnomedicine  
  Volume 14 Issue 28 Pages  
  Keywords Amazonia; Annonaceae; Architecture; Non-timber forest products; Oyapock; Palikur; Sapotaceae; Traditional technological knowledge  
  Abstract Background: Palikur Amerindians live in the eastern part of French Guiana which is undergoing deep-seated changes due to the geographical and economic opening of the region. So far, Palikur's traditional ecological knowledge is poorly documented, apart from medicinal plants. The aim of this study was to document ethnobotanical practices related to traditional construction in the region. Methods: A combination of qualitative and quantitative methods was used. Thirty-nine Palikur men were interviewed in three localities (Saint-Georges de l'Oyapock, Regina and Trois-Palétuviers) between December 2013 and July 2014. Twenty-four inventories of wood species used in traditional buildings were conducted in the villages, as well as ethnobotanical walks in the neighboring forests, to complete data about usable species and to determine Linnaean names. Results: After an ethnographic description of roundwood Palikur habitat, the in situ wood selection process of Palikur is precisely described. A total of 960 roundwood pieces were inventoried in situ according to Palikur taxonomy, of which 860 were beams and rafters, and 100 posts in 20 permanent and 4 temporary buildings. Twenty-seven folk species were identified. Sixty-three folk species used in construction were recorded during ethnobotanical walks. They correspond to 263 botanical species belonging to 25 families. Posts in permanent buildings were made of yawu (Minquartia guianensis) (51%) and wakap (Vouacapoua americana) (14%). Beams and rafters were made of wood from Annonaceae (79%) and Lecythidaceae (13%) families. The most frequently used species were kuukumwi priye (Oxandra asbeckii), kuukumwi seyne (Pseudoxandra cuspidata), and pukuu (Xylopia nitida and X. cayennensis). Conclusions: Although the Palikur's relationship with their habitat is undergoing significant changes, knowledge about construction wood is still very much alive in the Oyapock basin. Many people continue to construct traditional buildings alongside modern houses, using a wide array of species described here for the first time, along with the techniques used.  
  Address Université des Antilles, Université de Guyane, CIRAD, UMR Ecologie des Forêts de Guyane (EcoFoG), AgroParisTech, Cirad, INRA, Kourou, France  
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  Notes Export Date: 7 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 802  
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Author Petit, M.; Denis, T.; Rux, O.; Richard-Hansen, C.; Berzins, R. url  doi
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  Title Estimating jaguar (Panthera onca) density in a preserved coastal area of French Guiana Type Journal Article
  Year 2018 Publication Mammalia Abbreviated Journal Mammalia  
  Volume 82 Issue 2 Pages 188-192  
  Keywords camera trapping; density; French Guiana; home range; Panthera onca; spatially explicit capture recapture  
  Abstract Knowledge of the jaguar population is needed in French Guiana that faces an increase of human-jaguar conflicts. We carried out a camera trap survey to assess jaguar local density and home range size in a preserved coastal area of French Guiana. We ran spatially explicit capture recapture (SECR) models. In our model, the scale parameter σ, that is linked to the home range size, was larger for males (σ=3.87±0.59 SE km) than for females (σ=2.33±0.30 SE km). The assessed jaguar density was 3.22±0.87 SE ind. 100 km â '2, which should be considered as an optimal density in a French Guiana coastal area.  
  Address Office National de la Chasse et de la Faune Sauvage, Campus Agronomique, BP316, Kourou Cedex, French Guiana  
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  Notes Export Date: 7 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 803  
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Author Soong, J.L.; Marañon-Jimenez, S.; Cotrufo, M.F.; Boeckx, P.; Bodé, S.; Guenet, B.; Peñuelas, J.; Richter, A.; Stahl, C.; Verbruggen, E.; Janssens, I.A. doi  openurl
  Title Soil microbial CNP and respiration responses to organic matter and nutrient additions: Evidence from a tropical soil incubation Type Journal Article
  Year 2018 Publication Soil Biology and Biochemistry Abbreviated Journal  
  Volume 122 Issue Pages 141-149  
  Keywords 13c; Cnp; Microbial stoichiometry; Priming; Soil respiration; Tropics  
  Abstract Soil nutrient availability has a strong influence on the fate of soil carbon (C) during microbial decomposition, contributing to Earth's C balance. While nutrient availability itself can impact microbial physiology and C partitioning between biomass and respiration during soil organic matter decomposition, the availability of labile C inputs may mediate the response of microorganisms to nutrient additions. As soil organic matter is decomposed, microorganisms retain or release C, nitrogen (N) or phosphorus (P) to maintain a stoichiometric balance. Although the concept of a microbial stoichiometric homeostasis has previously been proposed, microbial biomass CNP ratios are not static, and this may have very relevant implications for microbial physiological activities. Here, we tested the hypothesis that N, P and potassium (K) nutrient additions impact C cycling in a tropical soil due to microbial stoichiometric constraints to growth and respiration, and that the availability of energy-rich labile organic matter in the soil (i.e. leaf litter) mediates the response to nutrient addition. We incubated tropical soil from French Guiana with a 13C labeled leaf litter addition and with mineral nutrient additions of +K, +N, +NK, +PK and +NPK for 30 days. We found that litter additions led to a ten-fold increase in microbial respiration and a doubling of microbial biomass C, along with greater microbial N and P content. We found some evidence that P additions increased soil CO2 fluxes. Additionally, we found microbial biomass CP and NP ratios varied more widely than CN in response to nutrient and organic matter additions, with important implications for the role of microorganisms in C cycling. The addition of litter did not prime soil organic matter decomposition, except in combination with +NK fertilization, indicating possible P-mining of soil organic matter in this P-poor tropical soil. Together, these results point toward an ultimate labile organic substrate limitation of soil microorganisms in this tropical soil, but also indicate a complex interaction between C, N, P and K availability. This highlights the difference between microbial C cycling responses to N, P, or K additions in the tropics and explains why coupled C, N and P cycle modeling efforts cannot rely on strict microbial stoichiometric homeostasis as an underlying assumption.  
  Address INRA, UMR Ecology of Guiana Forests (Ecofog), AgroParisTech, Cirad, CNRS, Université de Guyane, Université des Antilles, Kourou, France  
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  Notes Export Date: 16 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 804  
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Author Clair, B.; Déjardin, A.; Pilate, G.; Alméras, T. pdf  url
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  Title Is the G-layer a tertiary cell wall? Type Journal Article
  Year 2018 Publication Frontiers in Plant Science Abbreviated Journal  
  Volume 9 Issue Pages 623  
  Keywords Flax; G-layer; Gelatinous layer; Maturation stress; Secondary cell wall; Tension wood; Tertiary cell wall  
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  Address LMGC, CNRS, Université de Montpellier, Montpellier, France  
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  Notes Export Date: 31 May 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 805  
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Author Barraza, F.; Schreck, E.; Lévêque, T.; Uzu, G.; Lopez, F.; Ruales, J.; Prunier, J.; Marquet, A.; Maurice, L. url  doi
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  Title Cadmium bioaccumulation and gastric bioaccessibility in cacao: A field study in areas impacted by oil activities in Ecuador Type Journal Article
  Year 2017 Publication Environmental Pollution Abbreviated Journal  
  Volume 229 Issue Pages 950-963  
  Keywords Cacao; Cadmium; Ecuador; Health risk assessment; Uptake and bioaccumulation  
  Abstract Cacao from South America is especially used to produce premium quality chocolate. Although the European Food Safety Authority has not established a limit for cadmium (Cd) in chocolate raw material, recent studies demonstrate that Cd concentrations in cacao beans can reach levels higher than the legal limits for dark chocolate (0.8 mg kg−1, effective January 1st, 2019). Despite the fact that the presence of Cd in agricultural soils is related to contamination by fertilizers, other potential sources must be considered in Ecuador. This field study was conducted to investigate Cd content in soils and cacao cultivated on Ecuadorian farms in areas impacted by oil activities. Soils, cacao leaves, and pod husks were collected from 31 farms in the northern Amazon and Pacific coastal regions exposed to oil production and refining and compared to two control areas. Human gastric bioaccessibility was determined in raw cacao beans and cacao liquor samples in order to assess potential health risks involved. Our results show that topsoils (0–20 cm) have higher Cd concentrations than deeper layers, exceeding the Ecuadorian legislation limit in 39% of the sampling sites. Cacao leaves accumulate more Cd than pod husks or beans but, nevertheless, 50% of the sampled beans have Cd contents above 0.8 mg kg−1. Root-to-cacao transfer seems to be the main pathway of Cd uptake, which is not only regulated by physico-chemical soil properties but also agricultural practices. Additionally, natural Cd enrichment by volcanic inputs must not be neglected. Finally, Cd in cacao trees cannot be considered as a tracer of oil activities. Assuming that total Cd content and its bioaccessible fraction (up to 90%) in cacao beans and liquor is directly linked to those in chocolate, the health risk associated with Cd exposure varies from low to moderate.  
  Address Laboratoire des Sciences du Bois, UMR EcoFoG, ZI Pariacabo, Kourou, French Guiana  
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  Notes Cited By :1; Export Date: 4 June 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 806  
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Author Imbert, D. pdf  url
doi  openurl
  Title Hurricane disturbance and forest dynamics in east Caribbean mangroves Type Journal Article
  Year 2018 Publication Ecosphere Abbreviated Journal  
  Volume 9 Issue 7 Pages e02231  
  Keywords Caribbean; forest recovery; high-energy storms; mangrove; resilience; resistance; Special Feature: High-Energy Storms  
  Abstract Despite low plant diversity and structural simplicity, mangroves offer various ecosystem services to local human communities, including sheltering coastal social-ecological systems from high-energy storm damage. The expected increasing intensity of hurricanes due to climate change raises questions concerning the capacity of mangroves to resist and recover from such disturbances. Herein, this study contributes to a better understanding of (1) the relation between storm intensity and damage to mangrove vegetation, (2) the contributions of species-specific as well as stand-specific components of mangrove vegetation to ecosystem resistance, and (3) the recovery of pre-hurricane forest structure through time. The first two issues have been addressed using a stand-level approach implemented at two east Caribbean mangrove sites in response to three storm events. The third was addressed through a 23-yr survey of forest recovery following the passage of a high-energy storm across one of the two study sites. Generally, hurricane damage was primarily controlled by wind velocity, followed by the hydro-geomorphic context of mangrove forests and species-specific composition, respectively. The relationship between damage to trees and wind velocity evidenced a sigmoidal trend, with a maximum slope at a wind velocity averaging 130 and 180 km/h for higher vs. lower canopy stands, respectively. The red mangrove, Rhizophora mangle, was significantly less resistant to hurricane damage than was the black mangrove, Avicennia germinans. Unlike the fringe and scrub stands, inner, tall-canopy stands fully recovered by the end of the study (23 yr). These stands were more resilient because of their growth performances. Finally, the time for east Caribbean mangroves to recover from high-energy storms seems to fall within the range of the average return time of such disturbances. This may prevent such ecosystems from ever reaching a steady state.  
  Address Laboratoire de Biologie Végétale, UMR EcoFoG, BP 592, Université des Antilles, Pointe-à-Pitre Cedex, 97159, France  
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  Notes Export Date: 17 September 2018 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 819  
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