| Records |
| Author |
Yatabe, Y.; Kane, N.C.; Scotti-Saintagne, C.; Rieseberg, L.H. |
| Title |
Rampant gene exchange across a strong reproductive barrier between the annual sunflowers, Helianthus annuus and H-petiolaris |
Type |
Journal Article |
| Year |
2007 |
Publication |
Genetics |
Abbreviated Journal |
Genetics |
Volume  |
175 |
Issue |
4 |
Pages |
1883-1893 |
| Keywords |
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| Abstract |
Plant species may remain morphologically distinct despite gene exchange with congeners, yet little is known about the genomewide pattern of introgression among species. Here we analyze the effects of persistent gene flow on genomic differentiation between the sympatric sunflower species Helianthus annuus and H. petiolaris. While the species are strongly isolated in testcrosses, genetic distances at 108 microsatellite loci and 14 sequenced genes are highly variable and much lower (on average) than for more closely related but historically allopatric congeners. Our analyses failed to detect a positive association between levels of genetic differentiation and chromosomal rearrangements (as reported in a prior publication) or proximity to QTL for morphological differences or hybrid sterility. However, a significant increase in differentiation was observed for markers within 5 cM of chromosomal breakpoints. Together, these results suggest that islands of differentiation between these two species are small, except in areas of low recombination. Furthermore, only microsatellites associated with ESTs were identified as outlier loci in tests for selection, which might indicate that the ESTs themselves are the targets of selection rather than linked genes (or that coding regions are not randomly distributed). In general, these results indicate that even strong and genetically complex reproductive barriers cannot prevent widespread introgression. |
| Address |
Indiana Univ, Dept Biol, Bloomington, IN 47405 USA, Email: lriesebe@indiana.edu |
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| Publisher |
GENETICS |
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| ISSN |
0016-6731 |
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| Notes |
ISI:000246448800029 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
216 |
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| Author |
Petit, M.; Céréghino, R.; Carrias, J.-F.; Corbara, B.; Dezerald, O.; Petitclerc, F.; Dejean, A.; Leroy, C. |
| Title |
Are ontogenetic shifts in foliar structure and resource acquisition spatially conditioned in tank-bromeliads? |
Type |
Journal Article |
| Year |
2014 |
Publication |
Botanical Journal of the Linnean Society |
Abbreviated Journal |
Bot J Linn Soc |
| Volume |
175 |
Issue |
2 |
Pages |
299-312 |
| Keywords |
Aechmea mertensii; Camponotus femoratus; French Guiana; leaf traits; mutualistic ants; natural stable isotopes; ontogeny; Pachycondyla goeldii; phenotypic plasticity; plant morphology |
| Abstract |
The phenotypic plasticity of plants has been explored as a function of either ontogeny (apparent plasticity) or environment (adaptive plasticity), although few studies have analyzed these factors together. In the present study, we take advantage of the dispersal of Aechmea mertensii bromeliads by Camponotus femoratus or Pachycondyla goeldii ants in shaded and sunny environments, respectively, to quantify ontogenetic changes in morphological, foliar, and functional traits, and to analyze ontogenetic and ant species effects on 14 traits. Most of the morphological (plant height, number of leaves), foliar (leaf thickness, leaf mass area, total water content, trichome density), and functional (leaf δ13C) traits differed as a function of ontogeny. Conversely, only leaf δ15N showed an adaptive phenotypic plasticity. On the other hand, plant width, tank width, longest leaf length, stomatal density, and leaf C concentration showed an adaptation to local environment with ontogeny. The exception was leaf N concentration, which showed no trend at all. Aechmea mertensii did not show an abrupt morphological modification such as in heteroblastic bromeliads, although it was characterized by strong, size-related functional modifications for CO2 acquisition. The adaptive phenotypic variation found between the two ant species indicates the spatially conditioned plasticity of A. mertensii in the context of insect-assisted dispersal. However, ant-mediated effects on phenotypic plasticity in A. mertensii are not obvious because ant species and light environment are confounding variables. © 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 175, 299–312. |
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| ISSN |
1095-8339 |
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no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
564 |
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| Author |
Christensen-Dalsgaard, K.K.; Fournier, M.; Ennos, A.R.; Barfod, A.S. |
| Title |
Changes in vessel anatomy in response to mechanical loading in six species of tropical trees |
Type |
Journal Article |
| Year |
2007 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
| Volume |
176 |
Issue |
3 |
Pages |
610-622 |
| Keywords |
hydraulic architecture; hydraulic-mechanical trade-off; mechanical adaptation; rooting morphology; tropical trees; vascular anatomy |
| Abstract |
It is well known that trees adapt their supportive tissues to changes in loading conditions, yet little is known about how the vascular anatomy is modified in this process. We investigated this by comparing more and less mechanically loaded sections in six species of tropical trees with two different rooting morphologies. We measured the strain, vessel size, frequency and area fraction and from this calculated the specific conductivity, then measured the conductivity, modulus of elasticity and yield stress. The smallest vessels and the lowest vessel frequency were found in the parts of the trees subjected to the greatest stresses or strains. The specific conductivity varied up to two orders of magnitude between mechanically loaded and mechanically unimportant parts of the root system. A trade-off between conductivity and stiffness or strength was revealed, which suggests that anatomical alterations occur in response to mechanical strain. By contrast, between-tree comparisons showed that average anatomical features for the whole tree seemed more closely related to their ecological strategy. |
| Address |
Univ Manchester, Fac Life Sci, Manchester M60 1QD, Lancs, England, Email: karen@cd-mail.dk |
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Thesis |
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| Publisher |
BLACKWELL PUBLISHING |
Place of Publication |
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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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Expedition |
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Conference |
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| Notes |
ISI:000250275000013 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
156 |
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| Author |
Sardans, J.; Urbina, I.; Grau, O.; Asensio, D.; Ogaya, R.; Peñuelas, J. |
| Title |
Long-term drought decreases ecosystem C and nutrient storage in a Mediterranean holm oak forest |
Type |
Journal Article |
| Year |
2020 |
Publication |
Environmental and Experimental Botany |
Abbreviated Journal |
Environ. Exp. Bot. |
| Volume |
177 |
Issue |
104135 |
Pages |
|
| Keywords |
Aridity; Carbon stocks; Climate change; Nitrogen; Phosphorus; Potassium; Stoichiometry; carbon sequestration; deciduous forest; drought; experimental study; forest soil; long-term change; Mediterranean environment; net ecosystem exchange; nutrient cycling; shrub; stoichiometry; Mediterranean Sea; Phillyrea latifolia |
| Abstract |
Aridity has increased in recent decades in the Mediterranean Basin and is projected to continue to increase in the coming decades. We studied the consequences of drought on the concentrations, stoichiometries and stocks of carbon (C), nitrogen (N), phosphorus (P) and potassium (K) in leaves, foliar litter of a three dominant woody species and soil of a Mediterranean montane holm oak forest where soil-water content was experimentally reduced (15 % lower than the control plots) for 15 years. Nitrogen stocks were lower in the drought plots than in the control plots (8.81 ± 1.01 kg ha−1 in the forest canopy and 856 ± 120 kg ha−1 in the 0−15 cm soil layer), thus representing 7 and 18 % lower N stocks in the canopy and soil respectively. δ15N was consistently higher under drought conditions in all samples, indicating a general loss of N. Foliar C and K stocks were also lower but to a lesser extent than N. Decreases in biomass and C and N stocks due to drought were smallest for the most dominant tall shrub, Phillyrea latifolia, so our results suggest a lower capacity of this forest to store C and nutrients but also substantial resulting changes in forest structure with increasing drought. © 2020 Elsevier B.V. |
| Address |
Cirad, UMR EcoFoG (AgroParisTech, CNRS, Inra, Univ Antilles, Univ Guyane), Campus Agronomique, Kourou, 97310, French Guiana |
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Elsevier B.V. |
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Edition |
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| ISSN |
00988472 (Issn) |
ISBN |
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Approved |
no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
954 |
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| Author |
Nixon, S.; Agwa, A.; Robinson, S.; Walker, A.; Touchard, A.; Schroeder, C.; Vetter, I.; Kotze, A.C.; Herzig, V.; King, G.F. |
| Title |
Discovery and characterisation of novel peptides from Amazonian stinging ant venoms with antiparasitic activity |
Type |
Journal Article |
| Year |
2020 |
Publication |
Toxicon |
Abbreviated Journal |
Toxicon |
| Volume |
177 |
Issue |
1 |
Pages |
S60 |
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| Abstract |
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| Address |
The Institute for Molecular Bioscience, The University of Queensland, Australia; CSIRO Agriculture and Food, Australia; CNRS, UMR Ecologie des forêts de Guyane, France |
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| Publisher |
NLM (Medline) |
Place of Publication |
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Edition |
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| ISSN |
18793150 (Issn) |
ISBN |
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no |
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EcoFoG @ webmaster @ |
Serial |
973 |
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| Author |
Hattenschwiler, S.; Aeschlimann, B.; Couteaux, M.M.; Roy, J.; Bonal, D. |
| Title |
High variation in foliage and leaf litter chemistry among 45 tree species of a neotropical rainforest community |
Type |
Journal Article |
| Year |
2008 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
| Volume |
179 |
Issue |
1 |
Pages |
165-175 |
| Keywords |
French Guiana; interspecific and intraspecific variation; leaf litter traits; neotropical rainforest; nitrogen; nutrient resorption; phosphorus; stoichiometry |
| Abstract |
Distinct ecosystem level carbon : nitrogen : phosphorus (C : N : P) stoichiometries in forest foliage have been suggested to reflect ecosystem-scale selection for physiological strategies in plant nutrient use. Here, this hypothesis was explored in a nutrient-poor lowland rainforest in French Guiana. Variation in C, N and P concentrations was evaluated in leaf litter and foliage from neighbour trees of 45 different species, and the litter concentrations of major C fractions were also measured. Litter C ranged from 45.3 to 52.4%, litter N varied threefold (0.68-2.01%), and litter P varied seven-fold (0.009-0.062%) among species. Compared with foliage, mean litter N and P concentrations decreased by 30% and 65%, respectively. Accordingly, the range in mass-based N : P shifted from 14 to 55 in foliage to 26 to 105 in litter. Resorption proficiencies indicated maximum P withdrawal in most species, but with a substantial increase in variation in litter P compared with foliage. These data suggest that constrained ecosystem-level C : N : P ratios do not preclude the evolution of highly diversified strategies of nutrient use and conservation among tropical rainforest tree species. The resulting large variation in litter quality will influence stoichiometric constraints within the decomposer food web, with potentially far-ranging consequences on nutrient dynamics and plant-soil feedbacks. |
| Address |
[Haettenschwiler, Stephan; Aeschlimann, Beat; Couteaux, Marie-Madeleine; Roy, Jacques] CEFE, CNRS, F-34293 Montpellier 5, France, Email: stephan.hattenschwiler@cefe.cnrs.fr |
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| Publisher |
BLACKWELL PUBLISHING |
Place of Publication |
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0028-646X |
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| Notes |
ISI:000256412500017 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
139 |
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| Author |
Sist, P.; Sheil, D.; Kartawinata, K.; Priyadi, H. |
| Title |
Reduced-impact logging in Indonesian Borneo: some results confirming the need for new silvicultural prescriptions |
Type |
Journal Article |
| Year |
2003 |
Publication |
Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
| Volume |
179 |
Issue |
1-3 |
Pages |
415-427 |
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| Abstract |
Reduced-impact logging (RIL) and conventional techniques (CNV) were compared in a mixed dipterocarp hill forest in East Kalimantan in three blocks of about 100 ha each. Damage was evaluated using pre- and post-harvesting assessments in 24 one-hectare sample plots. RIL techniques nearly halved the number of trees destroyed (36 vs 60 trees/ha). RIL's main benefit was in the reduction of skidding damage (9.5% of the original tree population in RIL vs 25% in CNV). Before logging, mean canopy openness in CNV (three plots only) and RIL (9 plots) was similar (3.6 and 3.1%) and not significantly different (x(2) = 2.73, P = 0.254). After logging, the mean canopy openness was 19.2% in CNV (n = 9 plots) and 13.3% in RIL (n = 8 plots), and the distributions of the canopy class in RIL and CNV significantly different x(2) = 43.56, P < 0.001). CNV plots showed a higher proportion of measurements in the most open class greater than or equal to30% than in RIL. At a larger scale, the area of skidtrail per unit timber volume extracted was halved in the RIL compartment (15 m(2) vs 27 m(2) m(-3) for CNV). However, under high felling intensity (>8 trees/ha), both stand damage and canopy disturbance in RIL approached those recorded in CNV under low or moderate felling regime. Over this felling intensity threshold the effectiveness of RIL in reducing tree damage is limited. In mixed dipterocarp forest where harvestable timber density generally exceeds 10 trees/ha, a minimum diameter felling limit is clearly insufficient to keep extraction rates below 8 trees/ha. Based on these new results and previous studies in Borneo, we suggest three silvicultural rules: (1) to keep a minimum distance between stumps of ca. 40 m, (2) to ensure only single tree gaps using directional felling, (3) to harvest only stems with 60-100 cm dbh. Foresters, policy makers and certifiers should consider these as criteria for sustainable forest management. We emphasise the need to expand harvesting studies to look at impacts and trade-offs across larger forest landscapes, to expand RIL beyond silvicultural concepts and to include the maintenance of other forest goods and services. (C) 2002 Elsevier Science B.V. All rights reserved. |
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| ISSN |
0378-1127 |
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| Notes |
WOS:000183836300033 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
311 |
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| Author |
Vedel, V.; Scotti, I. |
| Title |
Promoting the promoter |
Type |
Journal Article |
| Year |
2011 |
Publication |
Plant Science |
Abbreviated Journal |
Plant Sci. |
| Volume |
180 |
Issue |
2 |
Pages |
182-189 |
| Keywords |
cis-Regulation; Evolutionary and developmental biology; Integrative evolution; Plant development; Population genetics; Transcription |
| Abstract |
Recent evolutionary studies clearly indicate that evolution is mainly driven by changes in the complex mechanisms of gene regulation and not solely by polymorphism in protein-encoding genes themselves. After a short description of the cis-regulatory mechanism, we intend in this review to argue that by applying newly available technologies and by merging research areas such as evolutionary and developmental biology, population genetics, ecology and molecular cell biology it is now possible to study evolution in an integrative way. We contend that, by analysing the effects of promoter sequence variation on phenotypic diversity in natural populations, we will soon be able to break the barrier between the study of extant genetic variability and the study of major developmental changes. This will lead to an integrative view of evolution at different scales. Because of their sessile nature and their continuous development, plants must permanently regulate their gene expression to react to their environment, and can, therefore, be considered as a remarkable model for these types of studies. (C) 2010 Elsevier Ireland Ltd. All rights reserved. |
| Address |
[Vedel, Vincent; Scotti, Ivan] INRA, UMR ECOFOG, Kourou 97387, French Guiana, Email: vincent.vedel@ecofog.gf |
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| Publisher |
ELSEVIER IRELAND LTD |
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Edition |
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| ISSN |
0168-9452 |
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| Notes |
ISI:000286562200002 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
291 |
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Phillips, P.D.; Thompson, I.S.; Silva, J.N.M.; van Gardingen, P.R.; Degen, B. |
| Title |
Scaling up models of tree competition for tropical forest population genetics simulation |
Type |
Journal Article |
| Year |
2004 |
Publication |
Ecological Modelling |
Abbreviated Journal |
Ecol. Model. |
| Volume |
180 |
Issue |
2-3 |
Pages |
419-434 |
| Keywords |
tropical rain; forest; population genetics; model SYMFOR; eco-gene; scaling up; competition |
| Abstract |
Understanding the effects of logging activity on genetic diversity is an important aspect of establishing the sustainability of selective logging management operations in tropical forests. Genetic variation is affected by selective logging directly, through the removal of and damage to trees within the population, and indirectly, through a change in the forest structure and environment in which the remaining population lives. Eco-Gene is a population genetics model applied to tropical forests over a scale of hundreds of hectares. SYMFOR is a modelling framework for individual-based spatially explicit ecological and management models applied to tropical forests over a scale of 0.25 4 ha. We have linked the models to enable simulations using processes involved in both models. To overcome problems of scale, the spatially explicit competition index calculated in SYMFOR simulations has been modelled such that it can be applied at scales representing much larger areas for which the data are not available, as required by Eco-Gene. The competition index is modelled as a distribution on a grid-square basis, and implemented in the linked Eco-Gene/SYMFOR system. Each tree within a grid-square is given a “relative competition” within the distribution, biased according to species. A competition index value is obtained for the tree by transforming the grid-square distribution to be relevant to the size of the tree, and extracting a value according to the tree's relative competition within the distribution. The distribution and each tree's relative competition within it change according to the effects of growth, mortality and logging activity. The model was calibrated using data from the Tapajos region of the Eastern Amazon forest. This paper describes the model, its calibration and validation and the implications of scaling up from an explicit representation to a modelled quantity. (C) 2004 Elsevier B.V. All rights reserved. |
| Address |
Embrapa Amazonia Oriental, BR-66095100 Belem, Para, Brazil, Email: paul.phillips@envams.co.uk |
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| Publisher |
ELSEVIER SCIENCE BV |
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Edition |
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| ISSN |
0304-3800 |
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| Notes |
ISI:000224635700012 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
234 |
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Ghislain, B.; Nicolini, E.-A.; Romain, R.; Ruelle, J.; Yoshinaga, A.; Alford, M.H.; Clair, B. |
| Title |
Multilayered structure of tension wood cell walls in Salicaceae sensu lato and its taxonomic significance |
Type |
Journal Article |
| Year |
2016 |
Publication |
Botanical Journal of the Linnean Society |
Abbreviated Journal |
Bot. J. Linn. Soc. |
| Volume |
182 |
Issue |
4 |
Pages |
744-756 |
| Keywords |
Flacourtiaceae; G-layer; multilayered tension wood; reaction wood |
| Abstract |
Salicaceae have been enlarged to include a majority of the species formerly placed in the polyphyletic tropical Flacourtiaceae. Several studies have reported a peculiar and infrequently formed multilayered structure of tension wood in four of the tropical genera. Tension wood is a tissue produced by trees to restore their vertical orientation and most studies have focused on trees developing tension wood by means of cellulose-rich, gelatinous fibres, as in Populus and Salix (Salicaceae s.s.). This study aims to determine if the multilayered structure of tension wood is an anatomical characteristic common in other Salicaceae and, if so, how its distribution correlates to phylogenetic relationships. Therefore, we studied the tension wood of 14 genera of Salicaceae and two genera of Achariaceae, one genus of Goupiaceae and one genus of Lacistemataceae, families closely related to Salicaceae or formerly placed in Flacourtiaceae. Opposite wood and tension wood were compared with light microscopy and three-dimensional laser scanning confocal microscopy. The results indicate that a multilayered structure of tension wood is common in the family except in Salix, Populus and one of their closest relatives, Idesia polycarpa. We suggest that tension wood may be a useful anatomical character in understanding phylogenetic relationships in Salicaceae. Further investigation is still needed on the tension wood of several other putatively close relatives of Salix and Populus, in particular Bennettiodendron, Macrohasseltia and Itoa. |
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1095-8339 |
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EcoFoG @ webmaster @ |
Serial |
718 |
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