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Author |
Cereghino, R.; Leroy, C.; Dejean, A.; Corbara, B. |
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Title |
Ants mediate the structure of phytotelm communities in an ant-garden bromeliad |
Type |
Journal Article |
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Year |
2010 |
Publication |
Ecology |
Abbreviated Journal |
Ecology |
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Volume |
91 |
Issue  |
5 |
Pages |
1549-1556 |
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Keywords |
Aechmea mertensii; ant-gardens; biodiversity; bromeliads; Camponotus femoratus; Crematogaster levior; macroinvertebrates; mutualism; Pachycondyla goeldii; phytotelmata; secondary forest; Sinnamary; French Guiana; species interactions |
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Abstract |
The main theories explaining the biological diversity of rain forests often confer a limited understanding of the contribution of interspecific interactions to the observed patterns. We show how two-species mutualisms can affect much larger segments of the invertebrate community in tropical rain forests. Aechmea mertensii (Bromeliaceae) is both a phytotelm (plant-held water) and an ant-garden epiphyte. We studied the influence of its. associated ant species (Pachycondyla goeldii and Camponotus femoratus) on the physical characteristics of the plants, and, subsequently, on the diversity of the invertebrate communities that inhabit their tanks. As dispersal agents for the bromeliads, P. goeldii and C. femoratus influence the shape and size of the bromeliad by determining the location of the seedling, from exposed to partially shaded areas. By coexisting on a local scale, the two ant species generate a gradient of habitat conditions in terms of available resources (space and food) for aquatic invertebrates, the diversity of the invertebrate communities increasing with greater volumes of water and fine detritus. Two-species mutualisms are widespread in nature, but their influence on the diversity of entire communities remains largely unexplored. Because macroinvertebrates constitute an important part of animal production in all ecosystem types, further investigations should address the functional implications of such indirect effects. |
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[Cereghino, Regis] Univ Toulouse, UPS, INPT, Lab Ecol Fonct,EcoLab, F-31062 Toulouse, France, Email: cereghin@cict.fr |
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ECOLOGICAL SOC AMER |
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0012-9658 |
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ISI:000277867600030 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
59 |
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Author |
Derory, J.; Scotti-Saintagne, C.; Bertocchi, E.; Le Dantec, L.; Graignic, N.; Jauffres, A.; Casasoli, M.; Chancerel, E.; Bodenes, C.; Alberto, F.; Kremer, A. |
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Title |
Contrasting relationships between the diversity of candidate genes and variation of bud burst in natural and segregating populations of European oaks |
Type |
Journal Article |
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Year |
2010 |
Publication |
Heredity |
Abbreviated Journal |
Heredity |
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Volume |
104 |
Issue |
5 |
Pages |
438-448 |
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Keywords |
nucleotide diversity; candidate gene; QTL; Qeurcus petraea |
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Abstract |
Nucleotide diversity was assessed within nine candidate genes (CGs) (in total 4.6 kb) for the time of bud burst in nine sessile oak (Quercus petraea) populations distributed in central and northern Europe. The sampled populations were selected on the basis of their contrasting times of bud burst observed in common garden experiments (provenance tests). The CGs were selected according to their expression profiles during the transition from quiescent to developing buds and/or their functional role in model plants. The overall nucleotide diversity was large (pi(tot) = 6.15 x 10(-3); pi(silent) = 11.2 x 10(-3)), but population differentiation was not larger than for microsatellites. No outlier single-nucleotide polymorphism (SNP) departing from neutral expectation was found among the total of 125 SNPs. These results contrasted markedly with the significant associations that were observed between the CGs and bud burst in segregating populations. Quantitative trait loci (QTLs) for bud burst were identified for 13 year*site seasonal observations in a cloned mapping pedigree. Nineteen QTLs were detected, and QTLs located on linkage groups 2, 5 and 9 contributed repeatedly to more than 12% of the phenotypic variation of the trait. Eight genes were polymorphic in the two parents of the pedigree and could be mapped on the existing genetic map. Five of them located within the confidence intervals of QTLs for bud burst. Interestingly, four of them located within the three QTLs exhibiting the largest contributions to bud burst. Heredity (2010) 104, 438-448; doi:10.1038/hdy.2009.134; published online 7 October 2009 |
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Address |
[Derory, J.; Scotti-Saintagne, C.; Bertocchi, E.; Graignic, N.; Jauffres, A.; Casasoli, M.; Chancerel, E.; Bodenes, C.; Alberto, F.; Kremer, A.] INRA, BIOGECO UMR1202, F-33610 Cestas, France, Email: antoine.kremer@pierroton.inra.fr |
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NATURE PUBLISHING GROUP |
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ISSN |
0018-067X |
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Notes |
ISI:000276952000005 |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
60 |
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Author |
Corbara, B.; Carpenter, J.M.; Cereghino, R.; Leponce, M.; Gibernau, M.; Dejean, A. |
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Title |
Diversity and nest site selection of social wasps along Guianese forest edges: assessing the influence of arboreal ants |
Type |
Journal Article |
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Year |
2009 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
332 |
Issue |
5 |
Pages |
470-479 |
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Keywords |
Polistinae; Diversity; Nest site selection; Ant-wasp-plant interactions; French Guiana |
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Abstract |
monitored), and estimate that we recorded up to 73% of the local social wasp fauna. This baseline study was complemented by a long-term survey of the same area and the examination of isolated trees (permitting us to record two additional species, resulting in a total of 63 wasp species). Our results form a continuum from species avoiding nesting on any plant (6.5% of the wasp species) to species nesting on plants but avoiding those sheltering ant nests (82%), to, finally, wasps nesting in association with arboreal ants known to divert army ant raids (11.5%). Consequently, this study documents that most wasp species select plants possibly repulsive to arboreal ants, while associations with arboreal ants, although confirmed here, have been overrepresented in the literature. To cite this article: B. Corbara et al., C. R. Biologies 332 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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Address |
[Dejean, Alain] CNRS Guyane, UPS 2561, F-97300 Cayenne, France, Email: bruno.corbara@univ-bpclermont.fr |
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ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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ISSN |
1631-0691 |
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Notes |
ISI:000266021400007 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
113 |
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Malhi, Y.; Aragao, L.E.O.C.; Metcalfe, D.B.; Paiva, R.; Quesada, C.A.; Almeida, S.; Anderson, L.; Brando, P.; Chambers, J.Q.; da Costa, A.C.L.; Hutyra, L.R.; Oliveira, P.; Patino, S.; Pyle, E.H.; Robertson, A.L.; Teixeira, L.M. |
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Title |
Comprehensive assessment of carbon productivity, allocation and storage in three Amazonian forests |
Type |
Journal Article |
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Year |
2009 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob. Change Biol. |
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Volume |
15 |
Issue |
5 |
Pages |
1255-1274 |
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Keywords |
allocation; Amazonia; carbon; growth; litterfall; productivity; respiration; roots; soil; tropical forest |
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Abstract |
The allocation and cycling of carbon (C) within forests is an important component of the biospheric C cycle, but is particularly understudied within tropical forests. We synthesise reported and unpublished results from three lowland rainforest sites in Amazonia (in the regions of Manaus, Tapajos and Caxiuana), all major sites of the Large-Scale Biosphere-Atmosphere Programme (LBA). We attempt a comprehensive synthesis of the C stocks, nutrient status and, particularly, the allocation and internal C dynamics of all three sites. The calculated net primary productivities (NPP) are 10.1 +/- 1.4 Mg C ha(-1) yr(-1) (Manaus), 14.4 +/- 1.3 Mg C ha(-1) yr(-1) (Tapajos) and 10.0 +/- 1.2 Mg C ha(-1) yr(-1) (Caxiuana). All errors bars report standard errors. Soil and leaf nutrient analyses indicate that Tapajos has significantly more plant-available phosphorus and calcium. Autotrophic respiration at all three sites (14.9-21.4 Mg C ha yr(-1)) is more challenging to measure, with the largest component and greatest source of uncertainty being leaf dark respiration. Comparison of measured soil respiration with that predicted from C cycling measurements provides an independent constraint. It shows general good agreement at all three sites, with perhaps some evidence for measured soil respiration being less than expected. Twenty to thirty percent of fixed C is allocated belowground. Comparison of gross primary productivity (GPP), derived from ecosystem flux measurements with that derived from component studies (NPP plus autotrophic respiration) provides an additional crosscheck. The two approaches are in good agreement, giving increased confidence in both approaches to estimating GPP. The ecosystem carbon-use efficiency (CUEs), the ratio of NPP to GPP, is similar at Manaus (0.34 +/- 0.10) and Caxiuana (0.32 +/- 0.07), but may be higher at Tapajos (0.49 +/- 0.16), although the difference is not significant. Old growth or infertile tropical forests may have low CUE compared with recently disturbed and/or fertile forests. |
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Address |
[Malhi, Yadvinder; Aragao, Luiz Eduardo O. C.; Metcalfe, Daniel B.; Anderson, Liana] Sch Geog & Environm, Environm Change Inst, Oxford OX1 3QY, England, Email: yadvinder.malhi@ouce.ox.ac.uk |
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WILEY-BLACKWELL PUBLISHING, INC |
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ISSN |
1354-1013 |
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Notes |
ISI:000265033700015 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
117 |
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Author |
Ruelle, J.; Beauchene, J.; Thibaut, A.; Thibaut, B. |
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Title |
Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species |
Type |
Journal Article |
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Year |
2007 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
64 |
Issue |
5 |
Pages |
503-510 |
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Keywords |
tension wood; opposite wood; tropical rainforest; physical and mechanical properties |
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Abstract |
On 10 trees from 10 species of French Guyana tropical rainforest in a clear active process of restoring verticality growth strains were measured in situ in order to determine the occurrence of tension wood within samples. Wood specimens were cut in the vicinity of the growth strains measurements in order to measure some mechanical and physical properties. As suspected, tensile growth strains was very much higher in tension wood zone, because longitudinal modulus of elasticity was slightly higher. Longitudinal shrinkage was also much higher in tension wood than in opposite wood. |
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Address |
UMR EcoFoG, Kourou 97387, Guyana, Email: ruelle@nuagr1.agr.nagoya-u.ac.jp |
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Publisher |
EDP SCIENCES S A |
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ISSN |
1286-4560 |
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Notes |
ISI:000248098600003 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
160 |
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Author |
Scotti, I.; Paglia, G.; Magni, F.; Morgante, M. |
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Title |
Population genetics of Norway spruce (Picea abies Karst.) at regional scale: sensitivity of different microsatellite motif classes in detecting differentiation |
Type |
Journal Article |
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Year |
2006 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
63 |
Issue |
5 |
Pages |
485-491 |
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Keywords |
conifers; SSR; divergence; statistical testing; genetic distance |
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Abstract |
Four populations of Norway spruce (Picea abies Karst.) were screened using nine nuclear microsatellite markers (three trinucleotides and six dinucleotides) and four chloroplast markers (all mononucleotides). Marker classes were compared for their variability, mutation rate and ability to detect differentiation between stands. Dinucleotide markers proved to be the most variable group and chloroplast stretches the least variable, with differences in mutation rate between the former and the latter spanning over two orders of magnitude. Variability correlated to the number of repeats but not to the absolute length of the microsatellite region. The different marker classes were combined with two different measures of genetic distance in order to investigate the performance of markers and evolutionary models for the study of genetic variation in natural populations of Norway spruce. Weir and Cockeram's F-ST generally performed better in this clear-cut, four-population model study. Chloroplast haplotypes turned out to be the most sensitive marker system, being able to differentiate populations and to detect differences in genetic variability between sub-regions. |
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Address |
INRA, UMR ECOFOG, Kourou 97387, French Guiana, Email: ivan.scotti@kourou.cirad.fr |
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EDP SCIENCES S A |
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1286-4560 |
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Notes |
ISI:000240514800005 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
177 |
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Author |
Almeras, T.; Yoshida, M.; Okuyama, T. |
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Title |
The generation of longitudinal maturation stress in wood is not dependent on diurnal changes in diameter of trunk |
Type |
Journal Article |
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Year |
2006 |
Publication |
Journal of Wood Science |
Abbreviated Journal |
J. Wood Sci. |
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Volume |
52 |
Issue |
5 |
Pages |
452-455 |
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Keywords |
maturation stress; growth stress; cell-wall maturation; continuous lighting; diurnal strains |
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Abstract |
A hypothetical mechanism for the generation of maturation stress in wood was tested experimentally. The hypothesis was that the maturation stress could partly originate in a physical mechanism related to daily changes in water pressure and associated diurnal strains. The matrix of lignin and hemicellulose, deposited in the cell wall during the night, would be put in compression by the effect of water tension during the next day. The cellulose framework, crystallizing during the day, would be put in tension by the decrease in tension at night and subsequent cell-wall swelling. This was tested on young saplings of sugi and beech. Half of the saplings were submitted to continuous lighting, which canceled diurnal strains. Saplings were tilted 40 degrees, and their uprighting movement was measured. The uprighting movement is directly due to the production of reaction wood and the concomitant development of large longitudinal maturation stress. It occurred in the continuously lighted plants at least as much as in control plants. We conclude that the generation of longitudinal maturation stress in tension or compression wood is not directly related to variations in water pressure and diurnal strains. |
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Address |
Nagoya Univ, Grad Sch Bioagr Sci, Lab Biomat Phys, Chikusa Ku, Nagoya, Aichi 4648601, Japan, Email: t_almeras@hotmail.com |
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Publisher |
SPRINGER TOKYO |
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ISSN |
1435-0211 |
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Notes |
ISI:000241010600012 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
222 |
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Author |
Clair, B.; Almeras, T.; Sugiyama, J. |
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Title |
Compression stress in opposite wood of angiosperms: observations in chestnut, mani and poplar |
Type |
Journal Article |
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Year |
2006 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
63 |
Issue |
5 |
Pages |
507-510 |
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Keywords |
reaction wood; compression wood; tension wood; opposite wood; plant biomechanics; growth stresses; microfibrils angle |
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Abstract |
In order to face environmental constraints, trees are able to re-orient their axes by controlling the stress level in the newly formed wood layers. Angiosperms and gymnosperms evolved into two distinct mechanisms: the former produce a wood with large tension pre-stress on the upper side of the tilted axis, while the latter produce a wood with large compression pre-stress on the lower side. In both cases, the difference between this stress level and that of the opposite side, in light tension, generates the bending of the axis. However, light values of compression were sometimes measured in the opposite side of angiosperms. By analysing old data on chestnut and mani and new data on poplar, this study shows that these values were not measurement artefacts. This reveals that generating light compression stress in opposite wood contributes to improve the performance of the re-orientation mechanism. |
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Address |
Kyoto Univ, Res Inst Sustainable Humanosphere, Lab Biomass Morphogenesis & Informat, Uji, Kyoto 6110011, Japan, Email: clair@lmgc.univ-montp2.fr |
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EDP SCIENCES S A |
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1286-4560 |
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Notes |
ISI:000240514800008 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
223 |
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Author |
Eva, H.D.; Belward, A.S.; De Miranda, E.E.; Di Bella, C.M.; Gond, V.; Huber, O.; Jones, S.; Sgrenzaroli, M.; Fritz, S. |
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Title |
A land cover map of South America |
Type |
Journal Article |
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Year |
2004 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob. Change Biol. |
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Volume |
10 |
Issue |
5 |
Pages |
731-744 |
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Keywords |
Amazonia; ecosystems; land cover; mapping; South America; vegetation classes |
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Abstract |
A digital land cover map of South America has been produced using remotely sensed satellite data acquired between 1995 and the year 2000. The mapping scale is defined by the 1 km spatial resolution of the map grid-cell. In order to realize the product, different sources of satellite data were used, each source providing either a particular parameter of land cover characteristic required by the legend, or mapping a particular land cover class. The map legend is designed both to fit requirements for regional climate modelling and for studies on land cover change. The legend is also compatible with a wider, global, land cover mapping exercise, which seeks to characterize the world's land surface for the year 2000. As a first step, the humid forest domain has been validated using a sample of high-resolution satellite images. The map demonstrates both the major incursions of agriculture into the remaining forest domains and the extensive areas of agriculture, which now dominate South America's grasslands. |
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Address |
Commiss European Communities, Joint Res Ctr, Inst Environm & Sustainabil, TP 440, I-21020 Ispra, Italy, Email: hugh.eva@jrc.it |
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Publisher |
BLACKWELL PUBLISHING LTD |
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ISSN |
1354-1013 |
ISBN |
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Notes |
ISI:000221421600015 |
Approved |
no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
235 |
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Author |
Roggy, J.C.; Moiroud, A.; Lensi, R.; Domenach, A.M. |
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Title |
Estimating N transfers between N-2-fixing actinorhizal species and the non-N-2-fixing Prunus avium under partially controlled conditions |
Type |
Journal Article |
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Year |
2004 |
Publication |
Biology and Fertility of Soils |
Abbreviated Journal |
Biol. Fertil. Soils |
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Volume |
39 |
Issue |
5 |
Pages |
312-319 |
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Keywords |
actinorhizal trees; mixed culture; litter; N transfer by roots; N-15 |
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Abstract |
Two methods of N transfer between plants-by litter decomposition and root-to-root exchange-were examined in mixed plantations of N-fixing and non-fixing trees. Nitrogen transfers from decaying litters were measured by placing N-15-labelled litters from four actinorhizal tree species around shoots of containerized Prunus avium. Nitrogen transfers by root-to-root exchanges were measured after foliar NO3-N-15 fertilization of Alnus subcordata and Elaeagnus angustifolia growing in containers in association with P. avium. During the first 2 years of litter decomposition, from 5-20% of the N, depending on the litter identity, was released and taken up by P. avium. N availability in the different litters was strongly correlated with the amount of water-soluble N, which was highest in leaves of E. angustifolia. In the association between fixing and non-fixing plants, 7.5% of the A. subcordata N and 25% of E. angustifolia N was transferred to P. avium by root exchange. These results showed that the magnitude of N transfers by root exchange depended on the associated N-2-fixing species. Among the species investigated, E. angustifolia displayed the highest capacity for exudating N from roots as well as for releasing N from litters. These qualities make this tree a promising species for enhancing wood yields in mixed stands. |
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Address |
INRA, ENGREF, CIRAD, Unite Mixte Rech,Lab Ecol Forets Trop Guyane, Kourou 97387, French Guiana, Email: roggy.j@cirad.fr |
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Corporate Author |
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Thesis |
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Publisher |
SPRINGER-VERLAG |
Place of Publication |
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Editor |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0178-2762 |
ISBN |
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Medium |
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Expedition |
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Conference |
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Notes |
ISI:000221197000002 |
Approved |
no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
236 |
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