Records |
Author |
Solander, K.C.; Newman, B.D.; Carioca De Araujo, A.; Barnard, H.R.; Berry, Z.C.; Bonal, D.; Bretfeld, M.; Burban, B.; Candido, L.A.; Célleri, R.; Chambers, J.Q.; Christoffersen, B.O.; Detto, M.; Dorigo, W.A.; Ewers, B.E.; Ferreira, S.J.F.; Knohl, A.; Leung, L.R.; McDowell, N.G.; Miller, G.R.; Monteiro, M.T.F.; Moore, G.W.; Negron-Juarez, R.; Saleska, S.R.; Stiegler, C.; Tomasella, J.; Xu, C. |
Title |
The pantropical response of soil moisture to El Niño |
Type |
Journal Article |
Year |
2020 |
Publication |
Hydrology and Earth System Sciences |
Abbreviated Journal |
Hydrol. Earth Syst. Sci. |
Volume |
24 |
Issue |
5 |
Pages |
2303-2322 |
Keywords |
Cluster analysis; Oceanography; Soil moisture; Surface waters; Tropics; Climate anomalies; Clustered datum; Hydrologic changes; Land data assimilation systems; Sea surface temperature anomalies; Situ soil moistures; Tropical hydrologies; Tropical Pacific ocean; Soil surveys |
Abstract |
The 2015–2016 El Niño event ranks as one of the most severe on record in terms of the magnitude and extent of sea surface temperature (SST) anomalies generated in the tropical Pacific Ocean. Corresponding global impacts on the climate were expected to rival, or even surpass, those of the 1997–1998 severe El Niño event, which had SST anomalies that were similar in size. However, the 2015–2016 event failed to meet expectations for hydrologic change in many areas, including those expected to receive well above normal precipitation. To better understand how climate anomalies during an El Niño event impact soil moisture, we investigate changes in soil moisture in the humid tropics (between ±25∘) during the three most recent super El Niño events of 1982–1983, 1997–1998 and 2015–2016, using data from the Global Land Data Assimilation System (GLDAS). First, we use in situ soil moisture observations obtained from 16 sites across five continents to validate and bias-correct estimates from GLDAS (r2=0.54). Next, we apply a k-means cluster analysis to the soil moisture estimates during the El Niño mature phase, resulting in four groups of clustered data. The strongest and most consistent decreases in soil moisture occur in the Amazon basin and maritime southeastern Asia, while the most consistent increases occur over eastern Africa. In addition, we compare changes in soil moisture to both precipitation and evapotranspiration, which showed a lack of agreement in the direction of change between these variables and soil moisture most prominently in the southern Amazon basin, the Sahel and mainland southeastern Asia. Our results can be used to improve estimates of spatiotemporal differences in El Niño impacts on soil moisture in tropical hydrology and ecosystem models at multiple scales. |
Address |
Coordination of Research and Development, National Centre for Monitoring and Early Warning of Natural Disasters, Cachoeira Paulista, Brazil |
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Copernicus GmbH |
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10275606 (Issn) |
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Export Date: 29 May 2020; Correspondence Address: Solander, K.C.; Earth and Environmental Sciences, Los Alamos National LaboratoryUnited States; email: ksolander@lanl.gov |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
934 |
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Author |
Gargallo-Garriga, A.; Sardans, J.; Granda, V.; Llusià, J.; Peguero, G.; Asensio, D.; Ogaya, R.; Urbina, I.; Van Langenhove, L.; Verryckt, L.T.; Chave, J.; Courtois, E.A.; Stahl, C.; Grau, O.; Klem, K.; Urban, O.; Janssens, I.A.; Peñuelas, J. |
Title |
Different “metabolomic niches” of the highly diverse tree species of the French Guiana rainforests |
Type |
Journal Article |
Year |
2020 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci. Rep. |
Volume |
10 |
Issue |
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Pages |
6937 |
Keywords |
article; ecological niche; French Guiana; metabolome; plant leaf; rainy season; reproduction; stress; tropical rain forest |
Abstract |
Tropical rainforests harbor a particularly high plant diversity. We hypothesize that potential causes underlying this high diversity should be linked to distinct overall functionality (defense and growth allocation, anti-stress mechanisms, reproduction) among the different sympatric taxa. In this study we tested the hypothesis of the existence of a metabolomic niche related to a species-specific differential use and allocation of metabolites. We tested this hypothesis by comparing leaf metabolomic profiles of 54 species in two rainforests of French Guiana. Species identity explained most of the variation in the metabolome, with a species-specific metabolomic profile across dry and wet seasons. In addition to this “homeostatic” species-specific metabolomic profile significantly linked to phylogenetic distances, also part of the variance (flexibility) of the metabolomic profile was explained by season within a single species. Our results support the hypothesis of the high diversity in tropical forest being related to a species-specific metabolomic niche and highlight ecometabolomics as a tool to identify this species functional diversity related and consistent with the ecological niche theory. © 2020, The Author(s). |
Address |
INRA, UMR EcoFoG, CNRS, Cirad, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, 97310, France |
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Nature Research |
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20452322 (Issn) |
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EcoFoG @ webmaster @ |
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930 |
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Author |
Touchard, A.; Aili, S.R.; Téné, N.; Barassé, V.; Klopp, C.; Dejean, A.; Kini, R.M.; Mrinalini; Coquet, L.; Jouenne, T.; Lefranc, B.; Leprince, J.; Escoubas, P.; Nicholson, G.M.; Treilhou, M.; Bonnafé, E. |
Title |
Venom Peptide Repertoire of the European Myrmicine Ant Manica rubida: Identification of Insecticidal Toxins |
Type |
Journal Article |
Year |
2020 |
Publication |
Journal of proteome research |
Abbreviated Journal |
J. Proteome Res. |
Volume |
19 |
Issue |
4 |
Pages |
1800-1811 |
Keywords |
glycosylated toxin; peptidome; polycationic α-helix; predation; pyroglutamate; reversible neurotoxicity |
Abstract |
Using an integrated transcriptomic and proteomic approach, we characterized the venom peptidome of the European red ant, Manica rubida. We identified 13 “myrmicitoxins” that share sequence similarities with previously identified ant venom peptides, one of them being identified as an EGF-like toxin likely resulting from a threonine residue modified by O-fucosylation. Furthermore, we conducted insecticidal assays of reversed-phase HPLC venom fractions on the blowfly Lucilia caesar, permitting us to identify six myrmicitoxins (i.e., U3-, U10-, U13-, U20-MYRTX-Mri1a, U10-MYRTX-Mri1b, and U10-MYRTX-Mri1c) with an insecticidal activity. Chemically synthesized U10-MYRTX-Mri1a, -Mri1b, -Mri1c, and U20-MYRTX-Mri1a irreversibly paralyzed blowflies at the highest doses tested (30-125 nmol·g-1). U13-MYRTX-Mri1a, the most potent neurotoxic peptide at 1 h, had reversible effects after 24 h (150 nmol·g-1). Finally, U3-MYRTX-Mri1a has no insecticidal activity, even at up to 55 nmol·g-1. Thus, M. rubida employs a paralytic venom rich in linear insecticidal peptides, which likely act by disrupting cell membranes. |
Address |
VenomeTech, 473 Route des Dolines – Villa 3, Valbonne, 06560, France |
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Publisher |
NLM (Medline) |
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15353907 (Issn) |
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Export Date: 20 April 2020 |
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no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
927 |
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Author |
Carrias, J.-F.; Gerphagnon, M.; Rodríguez-Pérez, H.; Borrel, G.; Loiseau, C.; Corbara, B.; Céréghino, R.; Mary, I.; Leroy, C. |
Title |
Resource availability drives bacterial succession during leaf-litter decomposition in a bromeliad ecosystem |
Type |
Journal Article |
Year |
2020 |
Publication |
FEMS microbiology ecology |
Abbreviated Journal |
FEMS Microbiol. Ecol. |
Volume |
96 |
Issue |
4 |
Pages |
fiaa045 |
Keywords |
16S rRNA gene; amplicon sequencing; bacterial diversity; community ecology; decomposition; ecological succession |
Abstract |
Despite the growing number of investigations on microbial succession during the last decade, most of our knowledge on primary succession of bacteria in natural environments comes from conceptual models and/or studies of chronosequences. Successional patterns of litter-degrading bacteria remain poorly documented, especially in undisturbed environments. Here we conducted an experiment with tank bromeliads as natural freshwater microcosms to assess major trends in bacterial succession on two leaf-litter species incubated with or without animal exclusion. We used amplicon sequencing and a co-occurrence network to assess changes in bacterial community structure according to treatments. Alpha-diversity and community complexity displayed the same trends regardless of the treatments, highlighting that primary succession of detrital-bacteria is subject to resource limitation and biological interactions, much like macro-organisms. Shifts in bacterial assemblages along the succession were characterized by an increase in uncharacterized taxa and potential N-fixing bacteria, the latter being involved in positive co-occurrence between taxa. These findings support the hypothesis of interdependence between taxa as a significant niche-based process shaping bacterial communities during the advanced stage of succession. © FEMS 2020. |
Address |
AMAP, IRD, CIRAD, CNRS, INRA, Université Montpellier, Montpellier, France |
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Publisher |
NLM (Medline) |
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Edition |
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ISSN |
15746941 (Issn) |
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Export Date: 14 April 2020 |
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no |
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EcoFoG @ webmaster @ |
Serial |
926 |
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Author |
Levionnois, S.; Coste, S.; Nicolini, E.; Stahl, C.; Morel, H.; Heuret, P. |
Title |
Scaling of petiole anatomies, mechanics and vasculatures with leaf size in the widespread Neotropical pioneer tree species Cecropia obtusa Trécul (Urticaceae) |
Type |
Journal Article |
Year |
2020 |
Publication |
Tree physiology |
Abbreviated Journal |
Tree Physiol. |
Volume |
40 |
Issue |
2 |
Pages |
245-258 |
Keywords |
allometry; leaf size; petiole anatomy; scaling; theoretical hydraulic conductivity; vessel widening; xylem |
Abstract |
Although the leaf economic spectrum has deepened our understanding of leaf trait variability, little is known about how leaf traits scale with leaf area. This uncertainty has resulted in the assumption that leaf traits should vary by keeping the same pace of variation with increases in leaf area across the leaf size range. We evaluated the scaling of morphological, tissue-surface and vascular traits with overall leaf area, and the functional significance of such scaling. We examined 1,271 leaves for morphological traits, and 124 leaves for anatomical and hydraulic traits, from 38 trees of Cecropia obtusa Trécul (Urticaceae) in French Guiana. Cecropia is a Neotropical genus of pioneer trees that can exhibit large laminas (0.4 m2 for C. obtusa), with leaf size ranging by two orders of magnitude. We measured (i) tissue fractions within petioles and their second moment of area, (ii) theoretical xylem hydraulic efficiency of petioles and (iii) the extent of leaf vessel widening within the hydraulic path. We found that different scaling of morphological trait variability allows for optimisation of lamina display among larger leaves, especially the positive allometric relationship between lamina area and petiole cross-sectional area. Increasing the fraction of pith is a key factor that increases the geometrical effect of supportive tissues on mechanical rigidity and thereby increases carbon-use efficiency. We found that increasing xylem hydraulic efficiency with vessel size results in lower leaf lamina area: xylem ratios, which also results in potential carbon savings for large leaves. We found that the vessel widening is consistent with hydraulic optimisation models. Leaf size variability modifies scaling of leaf traits in this large-leaved species. © The Author(s) 2020. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permission@oup.com. |
Address |
UMR AMAP, CIRAD, CNRS, IRD, Université de Montpellier, Montpellier, 34398, France |
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NLM (Medline) |
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Edition |
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17584469 (Issn) |
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Export Date: 16 March 2020 |
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no |
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EcoFoG @ webmaster @ |
Serial |
921 |
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Author |
Ntawuhiganayo, E.B.; Uwizeye, F.K.; Zibera, E.; Dusenge, M.E.; Ziegler, C.; Ntirugulirwa, B.; Nsabimana, D.; Wallin, G.; Uddling, J. |
Title |
Traits controlling shade tolerance in tropical montane trees |
Type |
Journal Article |
Year |
2020 |
Publication |
Tree physiology |
Abbreviated Journal |
Tree Physiol. |
Volume |
40 |
Issue |
2 |
Pages |
183-197 |
Keywords |
biomass allocation; leaf temperature; plant traits; Rwanda; shade intolerance; shade tolerance; tropical montane forest; article; biomass allocation; breathing; canopy; carbon balance; compensation; photosynthesis; plant leaf; plant stem; rain forest; Rwanda; shade tolerance; species difference; sweating |
Abstract |
Tropical canopies are complex, with multiple canopy layers and pronounced gap dynamics contributing to their high species diversity and productivity. An important reason for this complexity is the large variation in shade tolerance among different tree species. At present, we lack a clear understanding of which plant traits control this variation, e.g., regarding the relative contributions of whole-plant versus leaf traits or structural versus physiological traits. We investigated a broad range of traits in six tropical montane rainforest tree species with different degrees of shade tolerance, grown under three different radiation regimes (under the open sky or beneath sparse or dense canopies). The two distinct shade-tolerant species had higher fractional biomass in leaves and branches while shade-intolerant species invested more into stems, and these differences were greater under low radiation. Leaf respiration and photosynthetic light compensation point did not vary with species shade tolerance, regardless of radiation regime. Leaf temperatures in open plots were markedly higher in shade-tolerant species due to their low transpiration rates and large leaf sizes. Our results suggest that interspecific variation in shade tolerance of tropical montane trees is controlled by species differences in whole-plant biomass allocation strategy rather than by difference in physiological leaf traits determining leaf carbon balance at low radiation. © The Author(s) 2019. Published by Oxford University Press. |
Address |
Rwanda Agriculture and Animal Resources Development, PO Box 5016Kigali, Rwanda |
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NLM (Medline) |
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17584469 (Issn) |
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Export Date: 16 March 2020 |
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no |
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EcoFoG @ webmaster @ |
Serial |
922 |
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Author |
Privet, K.; Vedel, V.; Fortunel, C.; Orivel, J.; Martinez, Q.; Cerdan, A.; Baraloto, C.; Pétillon, J. |
Title |
Relative effciency of pitfall trapping vs. nocturnal hand collecting in assessing soil-dwelling spider diversity along a structural gradient of neotropical habitats |
Type |
Journal Article |
Year |
2020 |
Publication |
Diversity |
Abbreviated Journal |
Diversity |
Volume |
12 |
Issue |
2 |
Pages |
81 |
Keywords |
Araneae; Diversity indices; Functional diversity; Guiana shield; Sampling methods; Species richness; Turnover; Araneae |
Abstract |
Assessing spider diversity remains a great challenge, especially in tropical habitats where dozens of species can locally co-occur. Pitfall trapping is one of the most widely used techniques to collect spiders, but it suffers from several biases, and its accuracy likely varies with habitat complexity. In this study, we compared the efficiency of passive pitfall trapping versus active nocturnal hand collecting (\"HC) to capture low understory-dwelling spider taxonomical (morpho-species) and functional (hunting guilds) diversity along a structural gradient of habitats in French Guiana. We focused on four habitats describing a structural gradient: garden to the orchard to the forest edge to the undisturbed forest. Overall, estimated morpho-species richness and composition did not vary consistently between habitats, but abundances of ground-hunting spiders decreased significantly with increasing habitat complexity. We found habitat-dependence differences in taxonomic diversity between sampling strategies: NHC revealed higher diversity in the orchard, whereas pitfalls resulted in higher diversity in the forest. Species turnover resulted in high dissimilarity in species composition between habitats using either method. This study shows how pitfall trapping is influenced by habitat structure, rendering this sampling method incomplete for complex, tropical environments. However, pitfall traps remain a valuable component of inventories because they sample distinct assemblage of spiders. © 2020 by the authors. |
Address |
International Center for Tropical Botany, Department of Biological Sciences, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199, United States |
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Mdpi Ag |
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14242818 (Issn) |
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Export Date: 16 March 2020; Correspondence Address: Privet, K.; CNRS, Ecobio (Ecosystèmes, biodiversité, évolution), Université de RennesFrance; email: kprivet@hotmail.fr |
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EcoFoG @ webmaster @ |
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923 |
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Author |
Soong, J.L.; Janssens, I.A.; Grau, O.; Margalef, O.; Stahl, C.; Van Langenhove, L.; Urbina, I.; Chave, J.; Dourdain, A.; Ferry, B.; Freycon, V.; Herault, B.; Sardans, J.; Peñuelas, J.; Verbruggen, E. |
Title |
Soil properties explain tree growth and mortality, but not biomass, across phosphorus-depleted tropical forests |
Type |
Journal Article |
Year |
2020 |
Publication |
Scientific reports |
Abbreviated Journal |
Sci Rep |
Volume |
10 |
Issue |
2302 |
Pages |
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Keywords |
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Abstract |
We observed strong positive relationships between soil properties and forest dynamics of growth and mortality across twelve primary lowland tropical forests in a phosphorus-poor region of the Guiana Shield. Average tree growth (diameter at breast height) increased from 0.81 to 2.1 mm yr-1 along a soil texture gradient from 0 to 67% clay, and increasing metal-oxide content. Soil organic carbon stocks in the top 30 cm ranged from 30 to 118 tons C ha-1, phosphorus content ranged from 7 to 600 mg kg-1 soil, and the relative abundance of arbuscular mycorrhizal fungi ranged from 0 to 50%, all positively correlating with soil clay, and iron and aluminum oxide and hydroxide content. In contrast, already low extractable phosphorus (Bray P) content decreased from 4.4 to <0.02 mg kg-1 in soil with increasing clay content. A greater prevalence of arbuscular mycorrhizal fungi in more clayey forests that had higher tree growth and mortality, but not biomass, indicates that despite the greater investment in nutrient uptake required, soils with higher clay content may actually serve to sustain high tree growth in tropical forests by avoiding phosphorus losses from the ecosystem. Our study demonstrates how variation in soil properties that retain carbon and nutrients can help to explain variation in tropical forest growth and mortality, but not biomass, by requiring niche specialization and contributing to biogeochemical diversification across this region. |
Address |
Institut National Polytechnique Félix Houphouët-Boigny, Ivory CoastYamoussoukro, Cote d'Ivoire |
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NLM (Medline) |
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20452322 (Issn) |
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EcoFoG @ webmaster @ |
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916 |
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Author |
de Aguiar, H.J.A.C.; Barros, L.A.C.; Silveira, L.I.; Petitclerc, F.; Etienne, S.; Orivel, J. |
Title |
Cytogenetic data for sixteen ant species from North-eastern Amazonia with phylogenetic insights into three subfamilies |
Type |
Journal Article |
Year |
2020 |
Publication |
Comparative Cytogenetics |
Abbreviated Journal |
Comp. Cytogenet. |
Volume |
14 |
Issue |
1 |
Pages |
43-60 |
Keywords |
Biodiversity; Formicidae; Karyotype; Neotropical ants |
Abstract |
Ants play essential roles in most terrestrial ecosystems and may be considered pests for agriculture and agroforestry. Recent morphological and molecular data have challenged conventional ant phylogeny and the interpretation of karyotypic variations. Existing Neotropical ant cytogenetic data focus on Atlantic rainforest species, and provide evolutionary and taxonomic insight. However, there are data for only 18 Amazonian species. In this study, we describe the karyotypes of 16 ant species belonging to 12 genera and three subfamilies, collected in the Brazilian state of Amapa, and in French Guiana. The karyotypes of six species are described for the first time, including that of the South American genus Allomerus Mayr, 1878. The karyotype of Crematogaster Lund, 1831 is also described for the first time for the New World. For other species, extant data for geographically distinct populations was compared with our own data, e.g. for the leafcutter ants Acromyrmex balzani (Emery, 1890) and Atta sexdens (Linnaeus, 1758). The information obtained for the karyotype of Dolichoderus imitator Emery, 1894 differs from extant data from the Atlantic forest, thereby highlighting the importance of population cytogenetic approaches. This study also emphasizes the need for good chromosome preparations for studying karyotype structure. |
Address |
INRA, UMR EcoFoG, AgroParisTech, CIRAD, CNRS, Université de Guyane, Université des Antilles, Campus Agronomique, BP 316, Kourou Cedex, 97379, France |
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Pensoft Publishers |
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19930771 (Issn) |
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EcoFoG @ webmaster @ |
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917 |
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Author |
Do, N.A.; Dias, D.; Zhang, Z.; Huang, X.; Nguyen, T.T.; Pham, V.V.; Nait-Rabah, O. |
Title |
Study on the behavior of squared and sub-rectangular tunnels using the Hyperstatic Reaction Method |
Type |
Journal Article |
Year |
2020 |
Publication |
Transportation Geotechnics |
Abbreviated Journal |
Transp. Geotech. |
Volume |
22 |
Issue |
100321 |
Pages |
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Keywords |
Finite element method; Lining; Squared shape; Sub-rectangular shape; Tunnel; efficiency measurement; finite element method; numerical model; transportation development; transportation planning; tunnel design; tunnel lining |
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Address |
Saint-Petersburg Mining University, Russian Federation |
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Elsevier Ltd |
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22143912 (Issn) |
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EcoFoG @ webmaster @ |
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915 |
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