| Records |
| Author |
Wernsdorfer, H.; Caron, H.; Gerber, S.; Cornu, G.; Rossi, V.; Mortier, F.; Gourlet-Fleury, S. |
| Title |
Relationships between demography and gene flow and their importance for the conservation of tree populations in tropical forests under selective felling regimes |
Type |
Journal Article |
| Year |
2011 |
Publication |
Conservation Genetics |
Abbreviated Journal |
Conserv. Genet. |
| Volume |
12 |
Issue |
1 |
Pages |
15-29 |
| Keywords |
Genetic diversity; Gene flow; Population dynamics; Simulation model; Conservation; Forest management |
| Abstract |
Determining how tropical tree populations subject to selective felling (logging) pressure may be conserved is a crucial issue for forest management and studying this issue requires a comprehensive understanding of the relationships between population demography and gene flow. We used a simulation model, SELVA, to study (1) the relative impact of demographic factors (juvenile mortality, felling regime) and genetic factors (selfing, number and location of fathers, mating success) on long-term genetic diversity; and (2) the impact of different felling regimes on population size versus genetic diversity. Impact was measured by means of model sensitivity analyses. Juvenile mortality had the highest impact on the number of alleles and genotypes, and on the genetic distance between the original and final populations. Selfing had the greatest impact on observed heterozygote frequency and fixation index. Other factors and interactions had only minor effects. Overall, felling had a greater impact on population size than on genetic diversity. Interestingly, populations under relatively low felling pressure even had a somewhat lower fixation index than undisturbed populations (no felling). We conclude that demographic processes such as juvenile mortality should be modelled thoroughly to obtain reliable long-term predictions of genetic diversity. Mortality in selfed and outcrossed progenies should be modelled explicitly by taking inbreeding depression into account. The modelling of selfing based on population rate appeared to be oversimplifying and should account for inter-tree variation. Forest management should pay particular attention to the regeneration capacities of felled species. |
| Address |
[Wernsdoerfer, Holger] Ctr INRA Nancy, INRA, Lab Etude Ressources Foret Bois LERFoB, UMR1092, F-54280 Champenoux, France, Email: holger.wernsdoerfer@cirad.fr |
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SPRINGER |
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1566-0621 |
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ISI:000285971900002 |
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no |
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EcoFoG @ eric.marcon @ |
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289 |
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| Author |
Christensen-Dalsgaard, K.K.; Ennos, A.R.; Fournier, M. |
| Title |
Interrelations between hydraulic and mechanical stress adaptations in woody plants |
Type |
Journal Article |
| Year |
2008 |
Publication |
Plant Signaling and Behavior |
Abbreviated Journal |
Plant. Signal. Behav. |
| Volume |
3 |
Issue |
7 |
Pages |
463-465 |
| Keywords |
Conductivity; Modulus of elasticity; Strain; Tree ecophysiology; Tropical trees; Wood anatomy; Yield stress |
| Abstract |
The fields of plant water relations and plant biomechanics have traditionally been studied separately even though often the same tissues are responsible for water transport and mechanical support. There is now increasing evidence that hydraulic and mechanical adaptations may influence one another. We studied the changes in the hydraulic and mechanical properties of the wood along lateral roots of two species of buttressed trees. In these roots, the mechanical contstraints quantified by strain measurements are known to decrease distally. Further, we investigated the effect of mechanical loading on the vessel anatomy in these and four other species of tropical trees. We found that as the strain decreased, the wood became progressively less stiff and strong but the conductivity increased exponentially. This was reflected in that adaptations towards re-enforcing mechanically loaded areas resulted in xylem with fewer and smaller vessels. In addition a controlled growth experiment on three tree species showed that drought adaptation may results in plants with stronger and stiffer tissue. Our results indicate that hydraulic and mechanical stress adaptations may be interrelated, and so support recent studied suggesting that physiological responses are complex balances rather than pure optimisations. ©2008 Landes Bioscience. |
| Address |
University of Alberta, Department of Renewable Resources, 4-44 Earth Science Bldg., Edmonton, AB T6G 2E3, Canada |
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15592316 (Issn) |
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Export Date: 25 January 2012; Source: Scopus; Language of Original Document: English; Correspondence Address: Christensen-Dalsgaard, K. K.; University of Alberta, Department of Renewable Resources, 4-44 Earth Science Bldg., Edmonton, AB T6G 2E3, Canada; email: kkchrist@ualberta.ca |
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EcoFoG @ webmaster @ |
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380 |
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| Author |
Chartier, M.; Gibernau, M.; Renner, S.S. |
| Title |
The evolution of pollinator-plant interaction types in the araceae |
Type |
Journal Article |
| Year |
2014 |
Publication |
Evolution |
Abbreviated Journal |
Evolution |
| Volume |
68 |
Issue |
5 |
Pages |
1533-1543 |
| Keywords |
Ancestral state reconstruction; Inflorescence traits; Phylogeny; Pollination syndromes; Trap flowers |
| Abstract |
Most plant-pollinator interactions are mutualistic, involving rewards provided by flowers or inflorescences to pollinators. Antagonistic plant-pollinator interactions, in which flowers offer no rewards, are rare and concentrated in a few families including Araceae. In the latter, they involve trapping of pollinators, which are released loaded with pollen but unrewarded. To understand the evolution of such systems, we compiled data on the pollinators and types of interactions, and coded 21 characters, including interaction type, pollinator order, and 19 floral traits. A phylogenetic framework comes from a matrix of plastid and new nuclear DNA sequences for 135 species from 119 genera (5342 nucleotides). The ancestral pollination interaction in Araceae was reconstructed as probably rewarding albeit with low confidence because information is available for only 56 of the 120-130 genera. Bayesian stochastic trait mapping showed that spadix zonation, presence of an appendix, and flower sexuality were correlated with pollination interaction type. In the Araceae, having unisexual flowers appears to have provided the morphological precondition for the evolution of traps. Compared with the frequency of shifts between deceptive and rewarding pollination systems in orchids, our results indicate less lability in the Araceae, probably because of morphologically and sexually more specialized inflorescences. © 2013 The Society for the Study of Evolution. |
| Address |
Department of Biology, University of Munich, Munich, 80638, Germany |
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| Publisher |
Society for the Study of Evolution |
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15585646 (Issn) |
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Export Date: 30 May 2014; Source: Scopus; Coden: Evola; Language of Original Document: English |
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no |
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EcoFoG @ webmaster @ |
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544 |
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Henkel, T.W.; Wilson, A.W.; Aime, M.C.; Dierks, J.; Uehling, J.K.; Roy, M.; Schimann, H.; Wartchow, F.; Mueller, G.M. |
| Title |
Cantharellaceae of Guyana II: New species of Craterellus, new South American distribution records for Cantharellus guyanensis and Craterellus excelsus, and a key to the Neotropical taxa |
Type |
Journal Article |
| Year |
2014 |
Publication |
Mycologia |
Abbreviated Journal |
Mycologia |
| Volume |
106 |
Issue |
2 |
Pages |
307-324 |
| Keywords |
Cantharellales; Coccoloba; Dicymbe; Ectomycorrhizae; Guiana shield; Tropical fungi |
| Abstract |
Craterellus olivaceoluteus sp. nov. and Craterellus cinereofimbriatus sp. nov. are described as new to science. These fungi were collected from Guyana in association with ectomycorrhizal host trees in the genera Dicymbe (Fabaceae subfam. Caesalpinioideae) and Pakaraimaea (Dipterocarpaceae). Cantharellus guyanensis Mont., originally described from French Guiana, is redescribed from recent collections from Guyana, with additional range extensions for the species provided based on material examined from French Guiana, Venezuela, and north central, northeastern and southern Brazil, circumscribing nearly the entire Guiana Shield region and beyond. A new distribution record from French Guiana is provided for Craterellus excelsus T.W. Henkel & Aime. Macromorphological, micromorphological and habitat data are provided for the new species and C. guyanensis as well as DNA sequence data from the nuclear ribosomal regions of the internal transcribed spacer (ITS) and 28S large subunit (LSU); additional sequence data is provided for C. guyanensis and C. excelsus specimens collected outside Guyana. The relationships of these taxa within the Cantharellaceae were evaluated with phylogenetic analyses of ITS and LSU sequence data. This work brings the total number of Cantharellaceae species known from Guyana to eight. A key to the Cantharellus and Craterellus species known from the lowland Neotropics and extralimital montane Central and South America is provided. © 2014 by The Mycological Society of America. |
| Address |
Department of Biological Sciences, Boise State University, Boise, ID, 83725, United States |
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| Publisher |
Allen Press Inc. |
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15572536 (Issn) |
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Export Date: 10 June 2014; Coden: Mycoa; Correspondence Address: Henkel, T.W.; Department of Biological Sciences, Humboldt State University, Arcata, CA 95521, United States; email: twh5@humboldt.edu; Funding Details: DEB-0732968, NSF, National Science Foundation |
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no |
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EcoFoG @ webmaster @ |
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546 |
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Hamadi, A.; Borderies, P.; Albinet, C.; Koleck, T.; Villard, L.; Ho Tong Minh, D.; Le Toan, T.; Burban, B. |
| Title |
Temporal coherence of tropical forests at P-band: Dry and rainy seasons |
Type |
Journal Article |
| Year |
2015 |
Publication |
IEEE Geoscience and Remote Sensing Letters |
Abbreviated Journal |
IEEE Geosci. Remote Sens. Lett. |
| Volume |
12 |
Issue |
3 |
Pages |
557-561 |
| Keywords |
Biomass mission; forest scattering; ground-based experiment; P-band; range impulse response; temporal coherence |
| Abstract |
In this letter, the temporal coherence of tropical forest scattering at P-band is addressed by means of a ground-based experiment. The study is based on the TropiScat campaign in French Guiana, designed to support the Biomass mission, which will be the ESA 7th Earth Explorer mission. For Biomass, temporal coherence is a crucial parameter for coherent processing of polarimetric synthetic aperture radar (SAR) interferometry and SAR tomography in repeat-pass acquisitions. During the experiment, data were continuously collected for six months during both the rainy and dry seasons. For the rain-free days in both seasons, the coherence exhibits a daily cycle showing a high decorrelation during daytime, which is likely due to motion in the canopy. Up to a 20-day baseline, the coherence is much higher in the dry season than in the rainy season (> 0.8). From 20 to 40 days, it presents the same order of magnitude in both seasons [0.6, 0.7]. For larger temporal baselines, it becomes lower in the dry season. The results can be used to assess the long-term coherence of repeat-pass observations over a tropical forest. However, an extension of this study to several years and over other forest spots would be necessary to draw more general conclusions. |
| Address |
EcoFogKourou, France |
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| Publisher |
Institute of Electrical and Electronics Engineers Inc. |
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1545598x (Issn) |
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Export Date: 21 October 2014; Correspondence Address: Hamadi, A.; Centre d'Etudes Spatiales de la BiosphèreFrance; Funding Details: ESA, European Space Agency |
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no |
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EcoFoG @ webmaster @ |
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563 |
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Mouillot, D.; Bellwood, D.R.; Baraloto, C.; Chave, J.; Galzin, R.; Harmelin-Vivien, M.; Kulbicki, M.; Lavergne, S.; Lavorel, S.; Mouquet, N.; Paine, C.E.T.; Renaud, J.; Thuiller, W. |
| Title |
Rare Species Support Vulnerable Functions in High-Diversity Ecosystems |
Type |
Journal Article |
| Year |
2013 |
Publication |
PLoS Biology |
Abbreviated Journal |
PloS Biol. |
| Volume |
11 |
Issue |
5 |
Pages |
e1001569 |
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| Abstract |
Around the world, the human-induced collapses of populations and species have triggered a sixth mass extinction crisis, with rare species often being the first to disappear. Although the role of species diversity in the maintenance of ecosystem processes has been widely investigated, the role of rare species remains controversial. A critical issue is whether common species insure against the loss of functions supported by rare species. This issue is even more critical in species-rich ecosystems where high functional redundancy among species is likely and where it is thus often assumed that ecosystem functioning is buffered against species loss. Here, using extensive datasets of species occurrences and functional traits from three highly diverse ecosystems (846 coral reef fishes, 2,979 alpine plants, and 662 tropical trees), we demonstrate that the most distinct combinations of traits are supported predominantly by rare species both in terms of local abundance and regional occupancy. Moreover, species that have low functional redundancy and are likely to support the most vulnerable functions, with no other species carrying similar combinations of traits, are rarer than expected by chance in all three ecosystems. For instance, 63% and 98% of fish species that are likely to support highly vulnerable functions in coral reef ecosystems are locally and regionally rare, respectively. For alpine plants, 32% and 89% of such species are locally and regionally rare, respectively. Remarkably, 47% of fish species and 55% of tropical tree species that are likely to support highly vulnerable functions have only one individual per sample on average. Our results emphasize the importance of rare species conservation, even in highly diverse ecosystems, which are thought to exhibit high functional redundancy. Rare species offer more than aesthetic, cultural, or taxonomic diversity value; they disproportionately increase the potential breadth of functions provided by ecosystems across spatial scales. As such, they are likely to insure against future uncertainty arising from climate change and the ever-increasing anthropogenic pressures on ecosystems. Our results call for a more detailed understanding of the role of rarity and functional vulnerability in ecosystem functioning. © 2013 Mouillot et al. |
| Address |
Biological and Environmental Sciences, University of Stirling, Stirling, United Kingdom |
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15449173 (Issn) |
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Export Date: 12 June 2013; Source: Scopus; Art. No.: e1001569; Coden: Pblib; :doi 10.1371/journal.pbio.1001569; Language of Original Document: English; Correspondence Address: Mouillot, D.; Unité Mixte de Recherche (UMR) Centre National de la Recherche Scientifique (CNRS)-UM2, Institut français de recherche pour l'exploitation de la mer (IFREMER), Institute for Research and Development (IRD) 5119 ECOSYM, Université Montpellier 2 cc 093, Montpellier, France; email: david.mouillot@univ-montp2.fr |
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no |
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EcoFoG @ webmaster @ |
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492 |
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Touchard, A.; Aili, S.R.; Téné, N.; Barassé, V.; Klopp, C.; Dejean, A.; Kini, R.M.; Mrinalini; Coquet, L.; Jouenne, T.; Lefranc, B.; Leprince, J.; Escoubas, P.; Nicholson, G.M.; Treilhou, M.; Bonnafé, E. |
| Title |
Venom Peptide Repertoire of the European Myrmicine Ant Manica rubida: Identification of Insecticidal Toxins |
Type |
Journal Article |
| Year |
2020 |
Publication |
Journal of proteome research |
Abbreviated Journal |
J. Proteome Res. |
| Volume |
19 |
Issue |
4 |
Pages |
1800-1811 |
| Keywords |
glycosylated toxin; peptidome; polycationic α-helix; predation; pyroglutamate; reversible neurotoxicity |
| Abstract |
Using an integrated transcriptomic and proteomic approach, we characterized the venom peptidome of the European red ant, Manica rubida. We identified 13 “myrmicitoxins” that share sequence similarities with previously identified ant venom peptides, one of them being identified as an EGF-like toxin likely resulting from a threonine residue modified by O-fucosylation. Furthermore, we conducted insecticidal assays of reversed-phase HPLC venom fractions on the blowfly Lucilia caesar, permitting us to identify six myrmicitoxins (i.e., U3-, U10-, U13-, U20-MYRTX-Mri1a, U10-MYRTX-Mri1b, and U10-MYRTX-Mri1c) with an insecticidal activity. Chemically synthesized U10-MYRTX-Mri1a, -Mri1b, -Mri1c, and U20-MYRTX-Mri1a irreversibly paralyzed blowflies at the highest doses tested (30-125 nmol·g-1). U13-MYRTX-Mri1a, the most potent neurotoxic peptide at 1 h, had reversible effects after 24 h (150 nmol·g-1). Finally, U3-MYRTX-Mri1a has no insecticidal activity, even at up to 55 nmol·g-1. Thus, M. rubida employs a paralytic venom rich in linear insecticidal peptides, which likely act by disrupting cell membranes. |
| Address |
VenomeTech, 473 Route des Dolines – Villa 3, Valbonne, 06560, France |
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NLM (Medline) |
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15353907 (Issn) |
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Export Date: 20 April 2020 |
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no |
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EcoFoG @ webmaster @ |
Serial |
927 |
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Aili, S.R.; Touchard, A.; Petitclerc, F.; Dejean, A.; Orivel, J.; Padula, M.P.; Escoubas, P.; Nicholson, G.M. |
| Title |
Combined Peptidomic and Proteomic Analysis of Electrically Stimulated and Manually Dissected Venom from the South American Bullet Ant Paraponera clavata |
Type |
Journal Article |
| Year |
2017 |
Publication |
Journal of Proteome Research |
Abbreviated Journal |
J. Proteome Res. |
| Volume |
16 |
Issue |
3 |
Pages |
1339-1351 |
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| Abstract |
Ants have evolved venoms rich in peptides and proteins used for predation, defense, and communication. However, they remain extremely understudied due to the minimal amount of venom secreted by each ant. The present study investigated the differences in the proteome and peptidome of the venom from the bullet ant, Paraponera clavata. Venom samples were collected from a single colony either by manual venom gland dissection or by electrical stimulation and were compared using proteomic methods. Venom proteins were separated by 2D-PAGE and identified by nanoLC-ESI-QTOF MS/MS. Venom peptides were initially separated using C18 reversed-phase high-performance liquid chromatography, then analyzed by MALDI-TOF MS. The proteomic analysis revealed numerous proteins that could be assigned a biological function (total 94), mainly as toxins, or roles in cell regulation and transport. This investigation found that ca. 73% of the proteins were common to venoms collected by the two methods. The peptidomic analysis revealed a large number of peptides (total 309) but with <20% shared by the two collection methods. There was also a marked difference between venoms obtained by venom gland dissection from different ant colonies. These findings demonstrate the rich composition and variability of P. clavata venom. |
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American Chemical Society |
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1535-3893 |
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EcoFoG @ webmaster @ |
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746 |
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Rodrigues, A.M.; Amusant, N.; Beauchene, J.; Eparvier, V.; Lemenager, N.; Baudasse, C.; Espindola, L.S.; Stien, D. |
| Title |
The termiticidal activity of Sextonia rubra (Mez) van der Werff (Lauraceae) extract and its active constituent rubrynolide |
Type |
Journal Article |
| Year |
2011 |
Publication |
Pest Management Science |
Abbreviated Journal |
Pest Manage. Sci. |
| Volume |
67 |
Issue |
11 |
Pages |
1420-1423 |
| Keywords |
Nasutitermes macrocephalus; Reticulitermes flavipes; Rubrynolide; Sextonia rubra extract; Wood preservation |
| Abstract |
Termites are degradation agents that inflict severe damage on wood. Some long-lasting Amazonian trees can resist these insects by producing toxic secondary metabolites. These metabolites could potentially replace synthetic termiticidal products which are becoming more restricted to use. Results: Sextonia rubra is resistant to termite-induced degradation. It has been demonstrated that this species naturally produces an ethyl-acetate-soluble termiticidal metabolite, rubrynolide, to protect its wood. Assays in the presence of tropical and invasive termites established that both rubrynolide and crude ethyl acetate extract from S. rubra wood can be used as a treatment for the protection of sensitive woods against termites. Conclusion: Rubrynolide and S. rubra extract are promising candidates for the replacement of synthetic termiticides. © 2011 Society of Chemical Industry. |
| Address |
CNRS-Institut de Chimie des Substances Naturelles, Gif-sur-Yvette, France |
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1526498x (Issn) |
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Export Date: 26 October 2011; Source: Scopus; Coden: Pmscf; doi: 10.1002/ps.2167; Language of Original Document: English; Correspondence Address: Rodrigues, A.M.; UMR Ecofog, Institut d'Enseignement Supérieur de la Guyane, BP792, 97337 Cayenne Cedex, France; email: alice.rodrigues@pop.com.br |
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no |
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EcoFoG @ webmaster @ |
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362 |
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| Author |
Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J. |
| Title |
Host plant protection by arboreal ants: looking for a pattern in locally induced responses |
Type |
Journal Article |
| Year |
2008 |
Publication |
Evolutionary Ecology Research |
Abbreviated Journal |
Evol. Ecol. Res. |
| Volume |
10 |
Issue |
8 |
Pages |
1217-1223 |
| Keywords |
aggressiveness; ant-plant relationships; Azteca; biotic defence; induced responses |
| Abstract |
Background: Among arboreal ants, both territorially dominant species and plant-ants (e.g. species associated with myrmecophytes or plants housing them in hollow structures) protect their host trees against defoliators. Yet, locally induced responses, or the recruitment of nest-mates when a worker discovers it wound on its host-tree, were only noted in plant-ants. We wondered whether this might be due to the examination of the phenomenon being restricted to only six plant-ant species belonging to four genera. Based on the ant genus Azteca, a Neotropical group of arboreal species, we compared five species. The territorially dominant, carton-nester A. chartifex, three plant-ant species [A. alfari and A. ovaticeps associated with myrmecophitic Cecropia (Cecropiaceae), and A. bequaerti associated with Tococa guianensis (Melastomataceae)], and A. schimperi thought to be a temporary social parasite of true Cecropia ants. Methods: We artificially inflicted wounds to the foliage of the host tree of the different ant species. We then compared the number of workers on wounded versus control leaves. Results: We noted a locally induced response in the three plant-ant species as well as in the territorially dominant species, but very slightly so in A. schimperi. |
| Address |
[Grangier, Julien; Orivel, Jerome] Univ Toulouse 2, Lab Evolut & Diversite Biol, CNRS, UMR 5174, Toulouse, France, Email: alain.dejean@wanadoo.fr |
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EVOLUTIONARY ECOLOGY LTD |
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1522-0613 |
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ISI:000264041000008 |
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no |
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EcoFoG @ eric.marcon @ |
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119 |
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