| |
Records |
Links |
|
Author |
Coutand, C.; Dupraz, C.; Jaouen, G.; Ploquin, S.; Adam, B. |
|
| |
Title |
Mechanical stimuli regulate the allocation of biomass in trees: Demonstration with young Prunus avium trees |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Annals of Botany |
Abbreviated Journal |
Ann. Bot. |
|
| |
Volume |
101 |
Issue |
9 |
Pages |
1421-1432 |
|
| |
Keywords |
Prunus avium; growth; mechanical stress; bending; biomass; shoot/root ratio; wind; shelter |
|
| |
Abstract |
Background and Aims Plastic tree-shelters are increasingly used to protect tree seedlings against browsing animals and herbicide drifts. The biomass allocation in young seedlings of deciduous trees is highly disturbed by common plastic tree-shelters, resulting in poor root systems and reduced diameter growth of the trunk. The shelters have been improved by creating chimney-effect ventilation with holes drilled at the bottom, resulting in stimulated trunk diameter growth, but the root deficit has remained unchanged. An experiment was set up to elucidate the mechanisms behind the poor root growth of sheltered Prunus avium trees. Methods Tree seedlings were grown either in natural windy conditions or in tree-shelters. Mechanical wind stimuli were suppressed in ten unsheltered trees by staking. Mechanical stimuli (bending) of the stem were applied in ten sheltered trees using an original mechanical device. Key Results Sheltered trees suffered from poor root growth, but sheltered bent trees largely recovered, showing that mechano-sensing is an important mechanism governing C allocation and the shoot-root balance. The use of a few artificial mechanical stimuli increased the biomass allocation towards the roots, as did natural wind sway. It was demonstrated that there was an acclimation of plants to the imposed strain. Conclusions This study suggests that if mechanical stimuli are used to control plant growth, they should be applied at low frequency in order to be most effective. The impact on the functional equilibrium hypothesis that is used in many tree growth models is discussed. The consequence of the lack of mechanical stimuli should be incorporated in tree growth models when applied to environments protected from the wind (e.g. greenhouses, dense forests). |
|
| |
Address |
[Coutand, Catherine; Jaouen, Gaelle; Ploquin, Stephane; Adam, Boris] Univ Clermont Ferrand, INRA, UMR PIAF, F-63100 Clermont Ferrand, France, Email: coutand@clermont.inra.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
OXFORD UNIV PRESS |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0305-7364 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes  |
ISI:000255987500013 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
211 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Vendramin, G.G.; Fady, B.; Gonzalez-Martinez, S.C.; Hu, F.S.; Scotti, I.; Sebastiani, F.; Soto, A.; Petit, R.J. |
|
| |
Title |
Genetically depauperate but widespread: The case of an emblematic mediterranean pine |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
|
| |
Volume |
62 |
Issue |
3 |
Pages |
680-688 |
|
| |
Keywords |
chloroplast microsatellites; conservation genetics; diversity depletion; human impact; Pinus pinea |
|
| |
Abstract |
Genetic variation is generally considered a prerequisite for adaptation to new environmental conditions. Thus the discovery of genetically depauperate but geographically widespread species is unexpected. We used 12 paternally inherited chloroplast microsatellites to estimate population genetic variation across the full range of an emblematic circum-Mediterranean conifer, stone pine (Pinus pinea L.). The same chloroplast DNA haplotype is fixed in nearly all of the 34 investigated populations. Such a low level of variation is consistent with a previous report of very low levels of diversity at nuclear loci in this species. Stone pine appears to have passed through a severe and prolonged demographic bottleneck, followed by subsequent natural- and human-mediated dispersal across the Mediterranean Basin. No other abundant and widespread plant species has as little genetic diversity as P. pinea at both chloroplast and nuclear markers. However, the species harbors a nonnegligible amount of variation at adaptive traits. Thus a causal relationship between genetic diversity, as measured by marker loci, and the evolutionary precariousness of a species, cannot be taken for granted. |
|
| |
Address |
[Vendramin, Giovanni G.] Ist Genet Vegetale, Sez Firenze, Florence, Italy, Email: petit@pierroton.inra.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
BLACKWELL PUBLISHING |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0014-3820 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000253758600016 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
141 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Tindo, M.; Kenne, M.; Dejean, A. |
|
| |
Title |
Advantages of multiple foundress colonies in Belonogaster juncea juncea L.: greater survival and increased productivity |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Ecological Entomology |
Abbreviated Journal |
Ecol. Entomol. |
|
| |
Volume |
33 |
Issue |
2 |
Pages |
293-297 |
|
| |
Keywords |
colony development; evolution of eusociality; fitness; Polistinae; productivity |
|
| |
Abstract |
1. The ecological hypothesis predicts that multiple foundress colonies of social wasps may have a better survival rate and produce more brood per capita than single foundress colonies. With the aim of verifying if these characteristics exist in the primitively eusocial wasp species Belonogaster juncea juncea (L.), we monitored 49 foundations, including 13 single and 36 multiple foundress colonies, in Cameroon. 2. Multiple foundress colonies were significantly more successful than single foundress colonies in producing at least one adult. 3. The total productivity of the colonies increased significantly with the number of associated foundresses, but the productivity per capita did not. No single foundress colony reached the sexual phase, while eight (21.6%) multiple foundress colonies did. Males were produced in only five colonies, so that the sex ratio was biased in favour of females. 4. These results suggest that because of the strong ecological constraints on solitary nesting, survival and high colony productivity are two advantages of multiple foundress colonies in B. j. juncea. 5. The decreasing per capita productivity concomitant with an increasing number of females noted in this study illustrates once again Michener's paradox. The coefficient of variance of the per capita productivity significantly decreased with group size, as Wenzel and Pickering suggested in the model they created to explain the paradox. 6. Ecological factors may act in conjunction with other factors, such as genetic relatedness between associated foundresses, to promote joining behaviour in B. j. juncea. |
|
| |
Address |
[Tindo, Maurice; Kenne, Martin] Univ Douala, Fac Sci, BP Douala, Cameroon, Email: jtindo2000@yahoo.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
BLACKWELL PUBLISHING |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0307-6946 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000253710000017 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
142 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Leroy, C.; Jauneau, A.; Quilichini, A.; Dejean, A.; Orivel, J. |
|
| |
Title |
Comparison between the anatomical and morphological structure of leaf blades and foliar domatia in the ant-plant Hirtella physophora (Chrysobalanaceae) |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Annals of Botany |
Abbreviated Journal |
Ann. Bot. |
|
| |
Volume |
101 |
Issue |
4 |
Pages |
501-507 |
|
| |
Keywords |
anatomy; ant-plant mutualism; Chrysobalanaceae; extra-floral nectaries; French Guiana; Hirtella physophora; secondary domatia |
|
| |
Abstract |
Background and Aims Myrmecophytes, or ant-plants, are characterized by their ability to shelter colonies of some ant species in hollow structures, or ant-domatia, that are often formed by hypertrophy of the internal tissue at specific locations (i.e. trunk, branches, thorns and leaf pouches). In Hirtella physophora (Chrysobalanaceae), the focal species of this study, the ant-domatia consist of leaf pouches formed when the leaf rolls over onto itself to create two spheres at the base of the blade. Methods The morphological and anatomical changes through which foliar ant-domatia developed from the laminas are studied for the first time by using fresh and fixed mature leaves from the same H. physophora individuals. Key results Ant-domatia were characterized by larger extra-floral nectaries, longer stomatal apertures and lower stomatal density. The anatomical structure of the domatia differed in the parenchymatous tissue where palisade and spongy parenchyma were indistinct; chloroplast density was lower and lignified sclerenchymal fibres were more numerous compared with the lamina. In addition, the domatia were thicker than the lamina, largely because the parenchymatous and epidermal cells were enlarged. Conclusion Herein, the morphological and anatomical changes that permit foliar ant-domatia to be defined as a specialized leaf structure are highlighted. Similarities as well as structural modifications in the foliar ant-domatia compared with the lamina are discussed from botanical, functional and mutualistic points of view. These results are also important to understanding the reciprocal evolutionary changes in traits and, thus, the coevolutionary processes occurring in insect-plant mutualisms. |
|
| |
Address |
[Leroy, Celine; Quilichini, Angelique; Dejean, Alain; Orivel, Jerome] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse 9, France, Email: orivel@cict.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
OXFORD UNIV PRESS |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0305-7364 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000253489700003 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
212 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Brendel, O.; Le Thiec, D.; Scotti-Saintagne, C.; Bodenes, C.; Kremer, A.; Guehl, J.M. |
|
| |
Title |
Quantitative trait loci controlling water use efficiency and related traits in Quercus robur L |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Tree Genetics & Genomes |
Abbreviated Journal |
Tree Genet. Genomes |
|
| |
Volume |
4 |
Issue |
2 |
Pages |
263-278 |
|
| |
Keywords |
Quercus robur; carbon isotope composition; delta C-13; water use efficiency; QTL |
|
| |
Abstract |
Genetic variation for intrinsic water use efficiency (W-i) and related traits was estimated in a full-sib family of Quercus robur L. over 3 years. The genetic linkage map available for this F1 family was used to locate quantitative trait loci (QTL) for W-i, as estimated by leaf carbon stable isotope composition (delta C-13) or the ratio of net CO2 assimilation rate (A) to stomatal conductance to water vapour (g(w)) and related leaf traits. Gas exchange measurements were used to standardize estimates of A and g(w) and to model the sensitivity of gw to leaf-to-air vapour pressure deficit (sg(VPD)). delta C-13 varied by more than 3% among the siblings, which is equivalent to 40% variation of W-i. Most of the studied traits exhibited high clonal mean repeat-abilities (> 50%; proportion of clonal mean variability in global variance). Repeatabilities for delta C-13, leaf mass per area (LMA) and leaf nitrogen content were higher than 70%. For delta C-13, ten QTLs were detected, one of which was detected repeatedly for all 3 years and consistently explained more than 20% of measured variance. Four genomic regions were found in which co-localizing traits linked variation in W-i to variations in leaf chlorophyll and nitrogen content, LMA and sg(VPD). A positive correlation using clonal means between delta C-13 and A/g(w), as well as a co-localisation of QTL detected for both traits, can be seen as validation of the theoretical model linking the genetic architecture of these two traits. |
|
| |
Address |
[Brendel, Oliver; Le Thiec, Didier; Guehl, Jean-Marc] Ctr INRA Nancy, UMR INRA UHP 1137, F-54280 Seichamps, France, Email: brendel@nancy.inra.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
SPRINGER HEIDELBERG |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1614-2942 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000253091100013 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
143 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Bleron, L.; Duchanois, G.; Thibaut, B. |
|
| |
Title |
Characteristic properties of embedding strength for the nailing of the gonfolio rose (Qualea rosea Aubl.) |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Holzforschung |
Abbreviated Journal |
Holzforschung |
|
| |
Volume |
62 |
Issue |
1 |
Pages |
86-90 |
|
| |
Keywords |
embedding strength; Eurocode V; nail |
|
| |
Abstract |
Experimental results are presented with single nail joints of gonfolo rose which were loaded at different grain angles and compared to results obtained by Eurocode V. A wide range of embedding strength tests was conducted. The embedding behaviour across the grain was also investigated with a specific test apparatus. The results were analysed and modelled in terms of strength. Initial loading and unloading stiffness of the timber have been taken into account. The embedment strength of the nails varied according to the angle between the direction of loading and that to the grain. This work is part of a larger research project to establish a computer program for the prediction of stiffness and limit strengths of all timber-to-timber and timber-to-steel joints. |
|
| |
Address |
[Bleron, Laurent] LABOMAP ENSAM, F-71250 Poret De Paris, Cluny, France, Email: laurent.bleron@cluny.ensam.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
WALTER DE GRUYTER & CO |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0018-3830 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000252041400013 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
144 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Dejean, A.; Djieto-Lordon, C.; Orivel, J. |
|
| |
Title |
The plant ant Tetraponera aethiops (Pseudomyrmecinae) protects its host myrmecophyte Barteria fistulosa (Passifloraceae) through aggressiveness and predation |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
|
| |
Volume |
93 |
Issue |
1 |
Pages |
63-69 |
|
| |
Keywords |
ants; plant protection; territorial aggressiveness |
|
| |
Abstract |
Plant ants generally provide their host myrmecophytes (i.e. plants that shelter a limited number of ant species in hollow structures) protection from defoliating insects, but the exact nature of this protection is poorly known. It was with this in mind that we studied the association between Tetraponera aethiops F. Smith (Pseudomyrmecinae) and its specific host myrmecophyte Barteria fistulosa Mast. (Passifloraceae). Workers bore entrances into the horizontal hollow branches (domatia) of their host B. fistulosa, near the base of the petiole of the alternate horizontal leaves. They then ambush intruders from the domatia, close to these entrances. After perceiving the vibrations caused when an insect lands on a leaf, they rush to it and sting and generally spreadeagle the insect (only small caterpillars are mastered by single workers). Among the insects likely to defoliate B. fistulosa, adult leaf beetles and large katydids were taken as prey and cut up; single workers then retrieved some pieces, whereas other workers imbibed the prey's haemolymph. Other insects known to defoliate this plant, if unable to escape, were killed and discarded. Small Acrea zetes L. caterpillars were stung and then discarded by single workers; whereas locusts of different sizes were mastered by groups of workers that stung and spreadeagled them before discarding them (although a part of their haemolymph was imbibed). More workers were involved and more time was necessary to master insects taken as prey than those attacked and discarded. Consequently, the protection T. aethiops workers provide to their host B. fistulosa from defoliating insects results from predation, but more often from a type of aggressiveness wherein insects are killed and then discarded. (c) 2008 The Linnean Society of London. |
|
| |
Address |
[Dejean, Alain] CNRS Guyane, UPS 2561, F-97300 Cayenne, France, Email: alain.dejean@wanadoo.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
BLACKWELL PUBLISHING |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0024-4066 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000251738300007 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
213 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Herault, B. |
|
| |
Title |
Reconciling niche and neutrality through the Emergent Group approach |
Type |
Journal Article |
| |
Year |
2007 |
Publication |
Perspectives in Plant Ecology Evolution and Systematics |
Abbreviated Journal |
Perspect. Plant Ecol. Evol. Syst. |
|
| |
Volume |
9 |
Issue |
2 |
Pages |
71-78 |
|
| |
Keywords |
Biodiversity; ecological equivalency; biological traits; neutral theory; niche differentiation; redundancy |
|
| |
Abstract |
Both niche and neutral theories have been suggested as potential frameworks for modelling biodiversity. Niche models assume that biological traits represent evolutionary adaptations and define individuals in terms of functional trade-offs. Neutral models assume that all individuals at a single trophic level are functionally equivalent on a per capita basis with respect to their birth, death, dispersal and speciation. The opinion of many researchers is that neutral and niche processes operate simultaneously to generate diversity without knowing how the unification of both models can be achieved. Recently, several theoretical papers have reported evidence on the evolutionary emergence of niche structures shaping the emergence of groups of similar species. In this way, an Emergent Group is defined as a set of species that have a similar functional niche owing to a convergent ecological strategy. Central to the Emergent Group concept are the assumptions of functional equivalence within and of functional divergence between Emergent Groups. Within an Emergent Group, species richness is subject to a zero-sum rule set by the balance between the rate of individual loss and of immigration. Between Emergent Groups, tradeoffs such as seed size/seedling competitivity, investment in reproductive system/investment in vegetative systems or competitive ability/predator invulnerability are cornerstones of the evolutionary divergence. Delineating Emergent Groups amounts to reaching a compromise between maximizing niche differentiation (i.e. maximizing differences in functional tradeoffs) between Emergent Groups and maximizing neutrality within Emergent Groups. Up to now, the Emergent Group concept has been mostly proposed by theoretical scientists but it should be tested by empirical ecologists. The way in which niche and neutral models could be combined provides a profitable opportunity for theoretical and empirical scientists to collaborate fruitfully. (c) 2007 Rubel Foundation, ETH Zurich. Published by Elsevier GmbH. All rights reserved. |
|
| |
Address |
[Herault, Bruno] Univ Antilles Guyane, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: Bruno.Herault@cirad.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
ELSEVIER GMBH, URBAN & FISCHER VERLAG |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1433-8319 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000251685100002 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
147 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Schimann, H.; Ponton, S.; Hattenschwiler, S.; Ferry, B.; Lensi, R.; Domenach, A.M.; Roggy, J.C. |
|
| |
Title |
Differing nitrogen use strategies of two tropical rainforest late successional tree species in French Guiana: Evidence from N-15 natural abundance and microbial activities |
Type |
Journal Article |
| |
Year |
2008 |
Publication |
Soil Biology & Biochemistry |
Abbreviated Journal |
Soil Biol. Biochem. |
|
| |
Volume |
40 |
Issue |
2 |
Pages |
487-494 |
|
| |
Keywords |
soil; litter; nitrate; nitrification; tree rooting; N-15; Eperua falcata; Dicorynia guianensis; tropical forest |
|
| |
Abstract |
Previous studies in lowland tropical rainforests of French Guiana showed that, among non-N-2-fixing trees, two groups of late successional species contrasting in their leaf N-15 natural abundance coexist, suggesting two different main ways of nitrogen acquisition. Two abundant late-successional species typically co-occurring in rainforests in French Guiana, namely Eperua falcata and Dicorynia guianensis, were chosen as representative of each group. Stable isotope techniques and measurements of potentials of microbial N transformation were performed to assess to what extent leaf N-15 natural abundance of these species could be related to (i) delta N-15 signatures of soil mineral N sources and (ii) the capacity of soil to express nitrification and denitrification (both processes being directly involved in the balance between NH4+ and NO3-). Soil delta N-15-NH4+ was roughly similar to leaf delta N-15 of D. guianensis (around 3.5 parts per thousand), suggesting a preferential use of NH4+, whereas in E. falcata, leaf delta N-15 values were closer to root delta N-15-NO3- values (0.2 and -2.0 parts per thousand, respectively), suggesting a preferential use of NO3-. These differences in N source utilization were not accompanied by differences in availability in soil NO3- or in intensity of microbial functions responsible for soil N mineral evolution. However, (i) under both tree species, these functions showed clear spatial partitioning, with denitrification occurring potentially in soil and nitrification in the litter layer, and (ii) E falcata fine roots colonized the litter layer much more strongly than D. guianensis fine roots. This strongly suggests that (i) the contrasted leaf delta N-15 values found in the two late-successional species reveal distinct N acquisition strategies and (ii) the ability of roots to predominantly exploit the litter layer (E falcata) or the soil (D. guianensis) may constitute an important explanation of the observed differences. A complementarity between tree species, based on mineral N resource partitioning (itself resulting from a spatially structured location of the microbial functions responsible for the balance between NH4+ and NO3-), n thus be supposed. (c) 2007 Elsevier Ltd. All rights reserved. |
|
| |
Address |
[Schimann, Heidy; Ponton, Stephane; Domenach, Anne-Marie; Roggy, Jean-Christophe] UMR Ecol Forets Guyane, F-97387 Kourou, French Guiana, Email: heidy_schimann@cirad.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0038-0717 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000251655800021 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
146 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Jaouen, G.; Almeras, T.; Coutand, C.; Fournier, M. |
|
| |
Title |
How to determine sapling buckling risk with only a few measurements |
Type |
Journal Article |
| |
Year |
2007 |
Publication |
American Journal of Botany |
Abbreviated Journal |
Am. J. Bot. |
|
| |
Volume |
94 |
Issue |
10 |
Pages |
1583-1593 |
|
| |
Keywords |
biomechanics; critical buckling height; French Guiana; risk factor; sapling; stem form; tropical rain forest; trunk volume |
|
| |
Abstract |
Tree buckling risk (actual height/critical buckling height) is an important biomechanical trait of plant growth strategies, and one that contributes to species coexistence. To estimate the diversity of this trait among wide samples, a method that minimizes damage to the plants is necessary. On the basis of the rarely used, complete version of Greenhill's model (1881, Proceedings of the Cambridge Philosophical Society 4(2): 65-73), we precisely measured all the necessary parameters on a sample of 236 saplings of 16 species. Then, using sensitivity (variance) analysis, regressions between successive models for risk factors and species ranks and the use of these models on samples of self- and nonself-supporting saplings, we tested different degrees of simplification up to the most simple and widely used formula that assumes that the tree is a cylindrical homogeneous pole. The size factor had the greatest effect on buckling risk, followed by the form factor and the modulus of elasticity of the wood. Therefore, estimates of buckling risk must consider not only the wood properties but especially the form factor. Finally, we proposed a simple but accurate method of assessing tree buckling risk that is applicable to a wide range of samples and that requires mostly nondestructive measurements. |
|
| |
Address |
INRA, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: jaouen-g@kourou.cirad.fr |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
BOTANICAL SOC AMER INC |
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0002-9122 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
ISI:000251466600001 |
Approved |
no |
|
| |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
148 |
|
| Permanent link to this record |
