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Scotti-Saintagne, C.; Bertocchi, E.; Barreneche, T.; Kremer, A.; Plomion, C. |
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Title |
Quantitative trait loci mapping for vegetative propagation in pedunculate oak |
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Journal Article |
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Year |
2005 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
62 |
Issue  |
4 |
Pages |
369-374 |
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Keywords |
vegetative propagation; QTL; Quercus robur |
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Abstract |
Vegetative propagation is one of the main methods used for the deployment of improved genetic forest tree species. The objective of this paper was to study the genetic architecture of vegetative propagation by detecting Quantitative Trait Loci (QTL) in pedunculate oak ( Quercus robur). The mapping population consisted on an F-1 family of 278 offspring. Assessment of rooting ability over three years permitted the detection of 10 QTLs explaining between 4.4 and 13.8% of phenotypic variance, of which the two strongest were stable across years. Ongoing genomics programs in trees and in Arabidopsis are starting to shed light on the nature of the underlying genes. |
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Equipe Genet, INRA, UMR 1202, BIOGECO, F-33612 Cestas, France, Email: christophe.plomion@pierroton.inra.fr |
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E D P SCIENCES |
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1286-4560 |
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ISI:000229668600010 |
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EcoFoG @ eric.marcon @ |
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255 |
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Author |
Amusant, N.; Beauchene, J.; Fournier, M.; Janin, G.; Thevenon, M.F. |
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Title |
Decay resistance in Dicorynia guianensis Amsh.: analysis of inter-tree and intra-tree variability and relations with wood colour |
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Journal Article |
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Year |
2004 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
61 |
Issue |
4 |
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373-380 |
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Keywords |
Dicorynia guianensis; Amazonian wood; wood colour/decay resistance; heartwood; variability |
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Dicorynia guianensis Amsh. is very widespread in the forests of French Guiana and moreover is the leading species harvested in this area, but its main defect remains the great variability of wood durability, especially with respect to fungal decay. The aim of this work was to study this inter- and intra-tree variability in order to identify the parameters responsible for this variation (growth area, height and radial position) within the tree. The resistance decrease from the outer heartwood to the pith. Measurement of colour variation using the CIELAB (L*, a*, b*, C*, h*) system was performed at the intra-tree level to highlight the longitudinal and radial gradients of variation. Dicorynia guianensis becomes less red and dark from the outer to the inner heartwood and from the base to the top. Lastly, variations of colour and durability were correlated: the wood is less resistant the redder and darker it is. |
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CIRAD Foret, Forest Prod Programme, F-34398 Montpellier 5, France, Email: nadine.amusant@cirad.fr |
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E D P SCIENCES |
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1286-4560 |
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ISI:000223955500009 |
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EcoFoG @ eric.marcon @ |
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262 |
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Author |
Marcon, E.; Puech, F. |
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Title |
Evaluating the geographic concentration of industries using distance-based methods |
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Journal Article |
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Year |
2003 |
Publication |
Journal of Economic Geography |
Abbreviated Journal |
J. Econ. Geogr. |
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3 |
Issue |
4 |
Pages |
409-428 |
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Keywords |
agglomeration; clustering; geographic concentration; location of firms |
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We propose new methods for evaluating the spatial distribution of firms. To assess whether firms are concentrated or dispersed, economists have traditionally used indices that analyse the heterogeneity of a spatial structure at a single geographic level. We introduce distance-based methods, Besag's L function (derived from Ripley's K function) and Diggle and Chetwynd's D function to describe simultaneously spatial distribution at different geographical scales. Our empirical applications consider the distribution of French manufacturing firms in the Paris area and in France generally. For some geographic levels, results show significant concentration or dispersion of firms according to their sector of activity. |
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ENGREF, Kourou 97310, French Guiana |
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OXFORD UNIV PRESS |
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1468-2702 |
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ISI:000185742500004 |
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EcoFoG @ eric.marcon @ |
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269 |
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Author |
Vedel, V.; Apostolou, Z.; Arthur, W.; Akam, M.; Brena, C. |
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Title |
An early temperature-sensitive period for the plasticity of segment number in the centipede Strigamia maritima |
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Journal Article |
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Year |
2010 |
Publication |
Evolution & Development |
Abbreviated Journal |
Evol Dev |
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12 |
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4 |
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347-352 |
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1520-541X |
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WOS:000279440800002 |
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EcoFoG @ eric.marcon @ |
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278 |
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Petillon, J.; Montaigne, W.; Renault, D. |
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Hypoxic coma as a strategy to survive inundation in a salt-marsh inhabiting spider |
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Journal Article |
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2009 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol. Lett. |
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5 |
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4 |
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442-445 |
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1744-9561 |
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WOS:000267881700002 |
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EcoFoG @ webmaster @ |
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288 |
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Author |
Haettenschwiler, S.; Coq, S.; Barantal, S.; Handa, I.T. |
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Title |
Leaf traits and decomposition in tropical rainforests: revisiting some commonly held views and towards a new hypothesis |
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Journal Article |
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Year |
2011 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
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Volume |
189 |
Issue |
4 |
Pages |
950-965 |
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Keywords |
energy starvation; French Guiana; litter quality; mycorrhizas; nutrient cycling; nutrient limitation; phosphorus; soil fauna |
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Proper estimates of decomposition are essential for tropical forests, given their key role in the global carbon (C) cycle. However, the current paradigm for litter decomposition is insufficient to account for recent observations and may limit model predictions for highly diverse tropical ecosystems. In light of recent findings from a nutrient-poor Amazonian rainforest, we revisit the commonly held views that: litter traits are a mere legacy of live leaf traits; nitrogen (N) and lignin are the key litter traits controlling decomposition; and favourable climatic conditions result in rapid decomposition in tropical forests. Substantial interspecific variation in litter phosphorus (P) was found to be unrelated to variation in green leaves. Litter nutrients explained no variation in decomposition, which instead was controlled primarily by nonlignin litter C compounds at low concentrations with important soil fauna effects. Despite near-optimal climatic conditions, tropical litter decomposition proceeded more slowly than in a climatically less favourable temperate forest. We suggest that slow decomposition in the studied rainforest results from a syndrome of poor litter C quality beyond a simple lignin control, enforcing energy starvation of decomposers. We hypothesize that the litter trait syndrome in nutrient-poor tropical rainforests may have evolved to increase plant access to limiting nutrients via mycorrhizal associations. |
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[Haettenschwiler, Stephan; Coq, Sylvain; Barantal, Sandra; Handa, Ira Tanya] CNRS, CEFE, F-34293 Montpellier 5, France, Email: stephan.hattenschwiler@cefe.cnrs.fr |
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Wiley-Blackwell |
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0028-646x |
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ISI:000286940500009 |
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EcoFoG @ webmaster @ |
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296 |
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Author |
Sist, P.; Fimbel, R.; Sheil, D.; Nasi, R.; Chevallier, M.H. |
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Title |
Towards sustainable management of mixed dipterocarp forests of South-east Asia: moving beyond minimum diameter cutting limits |
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Journal Article |
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Year |
2003 |
Publication |
Environmental Conservation |
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30 |
Issue |
4 |
Pages |
364-374 |
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Selective logging applied in tropical forests is based on one universal criterion: a minimum diameter cutting limit for all commercial timber species. Minimum diameter cutting limits in mixed dipterocarp forests of the Malesia region lead to high felling intensities (10-20+ trees ha(-1)). Such extraction rates create massive stand damage (> 50% of the remaining tree population), which has a negative impact on the regeneration and growth of many harvested dipterocarp, species. As such, the minimum diameter cutting limit approach is seldom compatible with sustainable forest management. Where basic ecological characteristics of the commercial species are considered in timber harvesting prescriptions, mixed dipterocarp, forests appear capable of sustained timber yields, habitat conservation, and providing other goods and services. This paper first presents the main silvicultural systems developed in mixed dipterocarp, forests of Western Malesia and then reviews current knowledge of dipterocarp, biology to finally develop guidelines aimed at improving the ecological sustainability of production forests of Western Malesia. These guidelines, a pragmatic reflection of science and 'best guess' judgement, include: (1) integration of reduced-impact logging practices into normal management operations; (2) cutting of eight trees ha(-1) or less (with a felling cycle of 40-60 years to be determined according to local conditions); (3) defining minimum diameter cutting limits according to the structure, density and diameter at reproduction of target species; (4) avoiding harvesting species with less than one adult tree ha(-1) (diameter at breast height [dbh] greater than or equal to 50 cm over an area of 50-100 ha); (5) minimizing the size and connectivity of gaps (< 600 m(2) whenever possible); (6) refraining from treatments such as understorey clearing; and (7) providing explicit protection for key forest species and the ecological processes they perform. Further refinement is encouraged to allow for local conditions, and for other forest types. |
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0376-8929 |
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WOS:000188812100007 |
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EcoFoG @ webmaster @ |
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309 |
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Author |
Martin, J.M.; Roux, O.; Groc, S.; Dejean, A. |
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A type of unicoloniality within the native range of the fire ant Solenopsis saevissima |
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Journal Article |
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2011 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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334 |
Issue |
4 |
Pages |
307-310 |
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Keywords |
Ants; Solenopsis saevissima; Native range; Unicoloniality |
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To determine if a type of unicoloniality exists in the fire ant Solenopsis saevissima in its native range, we conducted intraspecific aggressiveness tests in French Guiana between workers originating from 15 human-disturbed sites. We identified two “colonial groups” spread over 54 km and 12.5 km, respectively. Workers from the same group never attacked each other, but inter-group confrontations resulted in a high level of aggressiveness. These large “colonial groups” enhances the threat occasioned by S. saevissima for both agriculture and the environment. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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[Martin, Jean-Michel; Roux, Olivier; Groc, Sarah; Dejean, Alain] Ecol Forets de Guyane UMR CNRS 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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Elsevier France-Editions Scientifiques Medicales Elsevier |
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1631-0691 |
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ISI:000290364200007 |
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EcoFoG @ webmaster @ |
Serial |
314 |
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Author |
McLean, J.P.; Zhang, T.; Bardet, S.; Beauchene, J.; Thibaut, A.; Clair, B.; Thibaut, B. |
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Title |
The decreasing radial wood stiffness pattern of some tropical trees growing in the primary forest is reversed and increases when they are grown in a plantation |
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Journal Article |
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Year |
2011 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
68 |
Issue |
4 |
Pages |
681-688 |
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Keywords |
Tropical trees; Growth strategy; Wood stiffness; Juvenile wood |
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Background This study examines the radial trend in wood stiffness of tropical rainforest trees. The objective was to determine if the type of growing environment (exposed plantation or dense primary forest) would have an effect on this radial trend. Methods The axial elastic modulus of wood samples, representing a pith to bark cross-section, of six trees from several French Guianese species (two of Eperua falcata, one of Eperua grandiflora, two of Carapa procera and one of Symphonia gloubulifera) was measured using a dynamic “forced vibration” method. Results Primary forest trees were observed to have a decrease in wood stiffness from pith to bark, whereas plantation trees, from the same genus or species, displayed a corresponding increase in wood stiffness. Juvenile wood stiffness appears to vary depending on the environment in which the tree had grown. Conclusion We suggest that the growth strategy of primary forest trees is to produce wood resistant to self-buckling so that the height of the canopy may be obtained with the maximum of efficiency. In contrast, the growth strategy of the trees growing in an exposed plantation is to produce low-stiffness wood, important to provide flexibility in wind. Further experiments to study the behaviour of more species, with more individuals per species, growing across a range of physical environments, are required. |
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[McLean, JP; Bardet, S; Clair, B; Thibaut, B] Univ Montpellier 2, LMGC, CNRS, F-34095 Montpellier, France, Email: p.mclean@auckland.ac.nz |
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Springer France |
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1286-4560 |
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WOS:000292553400003 |
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EcoFoG @ webmaster @ |
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326 |
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Author |
Stahl, C.; Burban, B.; Goret, J.Y.; Bonal, D. |
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Title |
Seasonal variations in stem CO(2) efflux in the Neotropical rainforest of French Guiana |
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Journal Article |
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Year |
2011 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
68 |
Issue |
4 |
Pages |
771-782 |
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Keywords |
Tropical rainforest; Stem CO(2) efflux; Soil water content; Terra Firme forest; Seasonally flooded forest |
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Introduction Stem CO(2) efflux (E (s)) is a significant component of total ecosystem respiration, but there is only scant information on seasonal variations in E (s) in tropical rainforests and on the main factors explaining these variations. Methods We conducted a comprehensive 18-month study in French Guiana to try to better understand which environmental factors contribute to seasonal variations in E (s) in two habitats differing in soil water conditions. Results In both habitats, large seasonal variations in E (s) were observed for most trees. The main variations occurred during climatic transition periods and were consistent with seasonal variations in soil and total ecosystem respiration. Discussion Seasonal variations in atmospheric conditions, including air temperature, did not explain seasonal variations in E (s). In contrast, seasonal variations in surface soil water content clearly induced seasonal variations in E (s) in each habitat. Both soil drought and flooded conditions induced a decrease in E (s). Conclusion Our results emphasize the need to integrate the influence of soil water content on E (s) into global models that simulate the response of forest ecosystem fluxes to climate changes. |
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Address |
[Bonal, D] INRA, UMR INRA UHP Ecol & Ecophysiol Forestiere 1137, F-54280 Champenoux, France, Email: bonal@nancy.inra.fr |
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Springer France |
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1286-4560 |
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WOS:000292553400011 |
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EcoFoG @ webmaster @ |
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327 |
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