| Records |
| Author |
Degen, B.; Blanc, L.; Caron, H.; Maggia, L.; Kremer, A.; Gourlet-Fleury, S. |
| Title |
Impact of selective logging on genetic composition and demographic structure of four tropical tree species |
Type |
Journal Article |
| Year |
2006 |
Publication |
Biological Conservation |
Abbreviated Journal |
Biol. Conserv. |
| Volume |
131 |
Issue  |
3 |
Pages |
386-401 |
| Keywords |
demography; genetic diversity; logging; phenology; pollen and seed dispersal; simulation; trees; tropics |
| Abstract |
Over-exploitation and fragmentation are serious problems for tropical forests. Most sustainable forest management practices avoid clear-cuts and apply selective logging systems focused on a few commercial species. We applied a simulation model to estimate the impact of such selective logging scenarios on the genetic diversity and demography of four tropical tree species from French Guiana. The simulations used data on genetic and demographic composition, growth, phenology and pollen and seed dispersal obtained for Dicorynia guianensis, Sextonia rubra, Symphonia globulifera and Vouacapoua americana at the experimental site in Paracou. Whereas Symphonia globulifera serves as a model for a species with low logging pressure, the other three species represent the most exploited tree species in French Guiana. In simulations with moderate logging, typical for French Guiana, with large cutting diameter (> 60 cm diameter) and long cutting cycles (65 years), the two species V. americana and Sextonia rubra were not able to recover their initial stock at the end of the rotation period, with a large decrease in the number of individuals and in basal area. Under a more intensive logging system (cutting diameter > 45 cm diameter, cutting cycles of 30 years) that is common practice in the Brazilian Amazon, only Symphonia globulifera showed no negative impact. Generally, the differences between the genetic parameters in the control scenarios without logging and the logging scenarios were surprisingly small. The main reasons for this were the overlapping of generations and the effective dispersal ability of gene vectors in all species, which guarantee relative homogeneity of the genetic structure in different age classes. Nevertheless, decreasing the population size by logging reduced the number of genotypes and caused higher genetic distances between the original population and the population at the end of the logging cycles. Sensitivity analysis showed that genetic changes in the logging scenarios were principally determined by the growth, densities and cutting diameter of each species, and only to a very small extent by the reproductive system including factors such as pollen and seed dispersal and flowering phenology. (c) 2006 Elsevier Ltd. All rights reserved. |
| Address |
BFH, Inst Forstgenet & Forstpflanzenzuchtung, D-22927 Grosshansdorf, Germany, Email: b.degen@holz.uni-hamburg.de |
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Thesis |
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| Publisher |
ELSEVIER SCI LTD |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0006-3207 |
ISBN |
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Expedition |
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Conference |
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| Notes |
ISI:000239139400004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
180 |
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| Author |
Campillo, F.; Rossi, V. |
| Title |
Convolution Particle Filter for Parameter Estimation in General State-Space Models |
Type |
Journal Article |
| Year |
2009 |
Publication |
IEEE Transactions on Aerospace and Electronic Systems |
Abbreviated Journal |
IEEE Trans. Aerosp. Electron. Syst. |
| Volume |
45 |
Issue |
3 |
Pages |
1063-1072 |
| Keywords |
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| Abstract |
The state-space modeling of partially observed dynamical systems generally requires estimates of unknown parameters. The dynamic state vector together with the static parameter vector can be considered as an augmented state vector. Classical filtering methods, such as the extended Kalman filter (EKF) and the bootstrap particle filter (PF), fail to estimate the augmented state vector. For these classical filters to handle the augmented state vector, a dynamic noise term should be artificially added to the parameter components or to the deterministic component of the dynamical system. However, this approach degrades the estimation performance of the filters. We propose a variant of the PF based on convolution kernel approximation techniques. This approach is tested on a simulated case study. |
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| Publisher |
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC |
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Original Title |
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Series Issue |
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Edition |
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| ISSN |
0018-9251 |
ISBN |
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Conference |
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| Notes |
ISI:000270225500017 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
194 |
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| Author |
Kiaer, L.P.; Felber, F.; Flavell, A.; Guadagnuolo, R.; Guiatti, D.; Hauser, T.P.; Olivieri, A.M.; Scotti, I.; Syed, N.; Vischi, M.; van de Wiel, C.; Jorgensen, R.B. |
| Title |
Spontaneous gene flow and population structure in wild and cultivated chicory, Cichorium intybus L |
Type |
Journal Article |
| Year |
2009 |
Publication |
Genetic Resources and Crop Evolution |
Abbreviated Journal |
Genet. Resour. Crop Evol. |
| Volume |
56 |
Issue |
3 |
Pages |
405-419 |
| Keywords |
AFLP; GM co-existence; Gene dispersal; Introgression; Risk assessment; SSAP |
| Abstract |
Spontaneous gene flow between wild and cultivated chicory, Cichorium intybus L., may have implications for the genetic structure and evolution of populations and varieties. One aspect of this crop-wild gene flow is the dispersal of transgenes from genetically modified varieties, e.g. gene flow from GM chicory to natural chicory could have unwanted consequences. With the purpose to identify and quantify crop-wild gene flow in chicory, we analysed introgression in 19 wild chicory populations and 16 accessions of chicory varieties and landraces distributed across Northern, Central and Mediterranean Europe. The analysis used 281 AFLP markers and 75 SSAP markers giving a total of 356 polymorphic markers. Results from model based assignments with the program STRUCTURE indicated many incidents of recent gene flow. Gene flow was observed both between cultivars and wild populations, between landraces and wild populations, between different wild populations as well as between cultivars. Population structure visualized by distance-based clustering showed a North-South geographical structuring of the wild populations, and a general grouping of the cultivars corresponding to known origin. The results indicated, however, that the structuring between the two groups of wild and cultivated types was weak. As crop and wild recipients are genetically close and genes are transferred between the two types rather frequently, focus on mitigating crop-wild gene flow should be increased, before transgenic varieties are cultivated openly. |
| Address |
[Kiaer, L. P.; Jorgensen, R. B.] DTU, Riso Natl Lab, Biosyst Dept, DK-4000 Roskilde, Denmark, Email: rikke.bagger.jorgensen@risoe.dk |
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Thesis |
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| Publisher |
SPRINGER |
Place of Publication |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0925-9864 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000264835300011 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
204 |
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| Author |
Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A. |
| Title |
Low intraspecific aggressiveness in two obligate plant-ant species |
Type |
Journal Article |
| Year |
2008 |
Publication |
Insectes Sociaux |
Abbreviated Journal |
Insect. Soc. |
| Volume |
55 |
Issue |
3 |
Pages |
238-240 |
| Keywords |
aggressiveness; Allomerus; myrmecophytes; plant-ants; recognition ability |
| Abstract |
Little is known about the aggressiveness of plant-ants typically living in isolated trees nor about how that aggressiveness varies based on this isolation. Here, we examine intra- and interspecific aggressiveness between workers of two Allomerus species associated with two different myrmecophytes. In both cases, the level of intraspecific aggressiveness is very low whatever the distance separating the tested nests, while interspecific conflicts are always violent. Similar patterns of aggressiveness have been reported in various ant species, but the strictly arboreal life of Allomerus ants associated with the isolation of their adult colonies highlight different ecological conditions that might explain the lack of aggressiveness between conspecifics. |
| Address |
[Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A.] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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| Publisher |
BIRKHAUSER VERLAG AG |
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Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0020-1812 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000258959300004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
208 |
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| Author |
Clair, B.; Almeras, T.; Yamamoto, H.; Okuyama, T.; Sugiyama, J. |
| Title |
Mechanical behavior of cellulose microfibrils in tension wood, in relation with maturation stress generation |
Type |
Journal Article |
| Year |
2006 |
Publication |
Biophysical Journal |
Abbreviated Journal |
Biophys. J. |
| Volume |
91 |
Issue |
3 |
Pages |
1128-1135 |
| Keywords |
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| Abstract |
A change in cellulose lattice spacing can be detected during the release of wood maturation stress by synchrotron x-ray diffraction experiment. The lattice strain was found to be the same order of magnitude as the macroscopic strain. The fiber repeat distance, 1.033 nm evaluated for tension wood after the release of maturation stress was equal to the conventional wood values, whereas the value before stress release was larger, corresponding to a fiber repeat of 1.035 nm, nearly equal to that of cotton and ramie. Interestingly, the fiber repeat varied from 1.033 nm for wood to 1.040 nm for algal cellulose, with an increasing order of lateral size of cellulose microfibrils so far reported. These lines of experiments demonstrate that, before the stress release, the cellulose was in a state of tension, which is, to our knowledge, the first experimental evidence supporting the assumption that tension is induced in cellulose microfibrils. |
| Address |
Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Kyoto, Japan, Email: sugiyama@rish.kyoto-u.ac.jp |
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Thesis |
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| Publisher |
BIOPHYSICAL SOCIETY |
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Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0006-3495 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000239086800039 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
224 |
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| Author |
de Grandcourt, A.; Epron, D.; Montpied, P.; Louisanna, E.; Bereau, M.; Garbaye, J.; Guehl, J.M. |
| Title |
Contrasting responses to mycorrhizal inoculation and phosphorus availability in seedlings of two tropical rainforest tree species |
Type |
Journal Article |
| Year |
2004 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
| Volume |
161 |
Issue |
3 |
Pages |
865-875 |
| Keywords |
phosphorus; growth; efficiency; Paris-type arbuscular mycorrhizas; tropical rainforest; seedlings; Dicorynia guianensis; Eperua falcata |
| Abstract |
This work aimed at understanding the role of mycorrhizal status in phosphorus efficiency of tree seedlings in the tropical rainforest of French Guyana. Mycorrhizal colonization, growth, phosphorus content, net photosynthesis and root respiration were determined on three occasions during a 9-month growth period for seedlings of two co-occurring species (Dicorynia guianensis and Eperua falcata) grown at three soil phosphorus concentrations, with or without inoculation with arbuscular mycorrhizas. Seedlings of both species were unable to absorb phosphorus in the absence of mycorrhizal association. Mycorrhizal seedlings exhibited coils that are specific of Paris-type mycorrhizae. Both species benefited from the mycorrhizal symbiosis in terms of phosphorus acquisition but the growth of E. falcata seedlings was unresponsive to this mycorrhizal improvement of phosphorus status, probably because of the combination of high seed mass and P reserves, with low growth rate. The two species belong to two different functional groups regarding phosphorus acquisition, D. guianensis being an obligate mycotrophic species. |
| Address |
Univ Franche Comte, Lab Biol & Ecophysiol, F-25211 Montbeliard, France, Email: daniel.epron@scbiol.uhp-nancy.fr |
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Thesis |
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| Publisher |
BLACKWELL PUBLISHING LTD |
Place of Publication |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0028-646X |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000188646500022 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
239 |
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| Author |
Almeras, T.; Gril, J.; Yamamoto, H. |
| Title |
Modelling anisotropic maturation strains in wood in relation to fibre boundary conditions, microstructure and maturation kinetics |
Type |
Journal Article |
| Year |
2005 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
| Volume |
59 |
Issue |
3 |
Pages |
347-353 |
| Keywords |
anisotropy; boundary conditions; cell-wall maturation; growth strain; multilayer model; residual stress; wood fibre |
| Abstract |
A generalisation of existing mechanical models is proposed to account for the relation between wood macroscopic properties and fibre microstructure and chemical composition. It is applied to understanding of the origin of anisotropic maturation strains measured at the outermost surface of the xylem. Various assumptions are considered for boundary conditions of the fibre during the progressive maturation process and are applied to experimental data from the literature. Assumptions that the fibre is fully restrained in displacement, or fully unrestrained or unrestrained in the transverse direction only are all incompatible with observations. Indeed, within the tree, the fibre is restrained in the longitudinal and tangential directions, but unrestrained in the radial direction towards the bark. Mixed boundary conditions must be introduced to correctly simulate both longitudinal and tangential maturation strains. In the context of an analytical axisymmetric model, this is estimated by considering a parameter of partial release of tangential stress during maturation. Consistence with data and with finite element computation in the case of a square fibre confirmed that, because of the unrestrained radial condition, a large part of the tangential maturation stress is released in situ. |
| Address |
Nagoya Univ, Grad Sch Bioagr Sci, Lab Biomat Phys, Chikusa Ku, Nagoya, Aichi 4648601, Japan, Email: tancrede@nuagr1.agr.nagoya-u.ac.jp |
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Thesis |
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| Publisher |
WALTER DE GRUYTER & CO |
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Summary Language |
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Series Issue |
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Edition |
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| ISSN |
0018-3830 |
ISBN |
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Conference |
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| Notes |
ISI:000228828800016 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
256 |
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| Author |
Scotti-Saintagne, C.; Mariette, S.; Porth, I.; Goicoechea, P.G.; Barreneche, T.; Bodenes, K.; Burg, K.; Kremer, A. |
| Title |
Genome scanning for interspecific differentiation between two closely related oak species [Quercus robur L. and Q petraea (Matt.) Liebl.] |
Type |
Journal Article |
| Year |
2004 |
Publication |
Genetics |
Abbreviated Journal |
Genetics |
| Volume |
168 |
Issue |
3 |
Pages |
1615-1626 |
| Keywords |
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| Abstract |
Interspecific differentiation values (G(ST)) between two closely related oak species (Quercus petraea and Q. robur) were compiled across different studies with the aim to explore the distribution of differentiation at the genome level. The study was based on a total set of 389 markers (isozymes, AFLPs, SCARs, microsatellites, and SNPs) for which allelic frequencies were estimated in pairs of populations sampled throughout the sympatric distribution of the two species. The overall distribution of GST values followed an L-shaped curve with most markers exhibiting low species differentiation (G(ST) < 0.01) and only a few loci reaching >10% levels. Twelve percent of the loci exhibited significant G(ST) deviations to neutral expectations, suggesting that selection contributed to species divergence. Coding regions expressed higher differentiation than noncoding regions. Among the 389 markers, 158 could be mapped on the 12 linkage groups of the existing Q. robur genetic map. Outlier loci with large G, values were distributed over 9 linkage groups. One cluster of three outlier loci was found within 0.51 cM; but significant autocorrelation of GST was observed at distances <2 cM. The size and distribution of genomic regions involved in species divergence are discussed in reference to hitchhiking effects and disruptive selection. |
| Address |
INRA, UMR Biodivers Genes & Ecosyst, F-33612 Cestas, France, Email: kremer@pierronton.inra.fr |
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| Publisher |
GENETICS |
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Summary Language |
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Series Issue |
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Edition |
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| ISSN |
0016-6731 |
ISBN |
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Conference |
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| Notes |
ISI:000225767400041 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
258 |
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| Author |
Yazdani, R.; Scotti, I.; Jansson, G.; Plomion, C.; Mathur, G. |
| Title |
Inheritance and diversity of simple sequence repeat (SSR) microsatellite markers in various families of Picea abies |
Type |
Journal Article |
| Year |
2003 |
Publication |
Hereditas |
Abbreviated Journal |
Hereditas |
| Volume |
138 |
Issue |
3 |
Pages |
219-227 |
| Keywords |
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| Abstract |
A large number of sequence-specific SSRs were screened by using electrophoresis on metaphore agarose gels with the bands visualized by ethidium bromide staining. Many SSRs appeared as codominant and many as dominant markers, with presence or absence of bands. A simple Mendelian inheritance pattern for most codominant and dominant SSR loci was found. For many codominant SSR markers, null alleles were detected. The proportion of dominant microsatellites detected in this study (close to 50 %) was much higher than that commonly reported in many other studies. A high proportion of dominant markers together with a high frequency of codominant markers with null alleles may represent two important limitations for the use of microsatellites in different studies. On the other hand, many polymorphic codominant SSR microsatellite markers were found to be highly repeatable, and can be used for population studies, seed certification, quality control of controlled crosses, paternity analysis, pollen contamination, and mapping of QTL in related families. In this paper, we report on the inheritance pattern and diversity of codominant and dominant SSR microsatellites in seven families of Picea abies sharing a common mother. |
| Address |
Swedish Univ Agr Sci, Dept Plant Biol & Forest Genet, Uppsala, Sweden |
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| Publisher |
BLACKWELL MUNKSGAARD |
Place of Publication |
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Summary Language |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0018-0661 |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000187074000010 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
268 |
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| Author |
Clair, B.; Arinero, R.; Leveque, G.; Ramonda, M.; Thibaut, B. |
| Title |
Imaging the mechanical properties of wood cell wall layers by atomic force modulation microscopy |
Type |
Journal Article |
| Year |
2003 |
Publication |
IAWA Journal |
Abbreviated Journal |
IAWA J. |
| Volume |
24 |
Issue |
3 |
Pages |
223-230 |
| Keywords |
wood; cell wall; mechanical properties; elastic modulus; tension wood |
| Abstract |
Atomic Force Microscopy in force modulation mode was used to study the elastic properties of the different fibre wall layers of the tension wood of holm oak and normal wood of boco. The method is based on the measurement of the resonance frequency of the microscope lever in contact with the sample. This frequency is related to the reduced Young modulus E* = E/(1-nu(2)) of the material, supposed to be isotropic. 'Elastic' images of the cell are obtained simultaneously with the topographic images, which allows the observation of the mechanical properties of the cells at a nanometric scale. Layers G, S-1, S-2 and ML can clearly be distinguished. By comparison with known materials an estimation of the absolute modulus is given in the range 5-20 GPa, but should be considered with caution, because the inherent anisotropy of the materials has not been taken into account. |
| Address |
Univ Montpellier 2, CNRS, UMR 5508, Lab Mecan & Genie Civil, F-34095 Montpellier, France |
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| Publisher |
INT ASSOC WOOD ANATOMISTS |
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Summary Language |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0928-1541 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ISI:000185049700003 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
270 |
| Permanent link to this record |
