Records |
Author |
Levionnois, S.; Ziegler, C.; Jansen, S.; Calvet, E.; Coste, S.; Stahl, C.; Salmon, C.; Delzon, S.; Guichard, C.; Heuret, P. |
Title |
Vulnerability and hydraulic segmentations at the stem–leaf transition: coordination across Neotropical trees |
Type |
Journal Article |
Year |
2020 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
Volume |
228 |
Issue |
2 |
Pages |
512-524 |
Keywords |
drought-induced embolism resistance; hydraulic segmentation; leaf-specific conductivity; stem–leaf transition; tropical trees; vulnerability segmentation; air bubble; hydraulic conductivity; leaf; Neotropical Region; rainforest; tropical forest; vulnerability; xylem |
Abstract |
Hydraulic segmentation at the stem–leaf transition predicts higher hydraulic resistance in leaves than in stems. Vulnerability segmentation, however, predicts lower embolism resistance in leaves. Both mechanisms should theoretically favour runaway embolism in leaves to preserve expensive organs such as stems, and should be tested for any potential coordination. We investigated the theoretical leaf-specific conductivity based on an anatomical approach to quantify the degree of hydraulic segmentation across 21 tropical rainforest tree species. Xylem resistance to embolism in stems (flow-centrifugation technique) and leaves (optical visualization method) was quantified to assess vulnerability segmentation. We found a pervasive hydraulic segmentation across species, but with a strong variability in the degree of segmentation. Despite a clear continuum in the degree of vulnerability segmentation, eight species showed a positive vulnerability segmentation (leaves less resistant to embolism than stems), whereas the remaining species studied exhibited a negative or no vulnerability segmentation. The degree of vulnerability segmentation was positively related to the degree of hydraulic segmentation, such that segmented species promote both mechanisms to hydraulically decouple leaf xylem from stem xylem. To what extent hydraulic and vulnerability segmentation determine drought resistance requires further integration of the leaf–stem transition at the whole-plant level, including both xylem and outer xylem tissue. © 2020 The Authors. New Phytologist © 2020 New Phytologist Trust |
Address |
Univ. Bordeaux, INRAE, BIOGECO, Pessac, F-33615, France |
Corporate Author |
|
Thesis |
|
Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0028646x (Issn) |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
952 |
Permanent link to this record |
|
|
|
Author |
Li, Lingjuan ; Preece, Catherine ; Lin, Qiang ; Bréchet, Laëtitia M. ; Stahl, Clément ; Courtois, Elodie A. ; Verbruggen, Erik |
Title |
Resistance and resilience of soil prokaryotic communities in response to prolonged drought in a tropical forest |
Type |
Journal Article |
Year |
2021 |
Publication |
FEMS Microbiology Ecology |
Abbreviated Journal |
|
Volume |
97 |
Issue |
9 |
Pages |
|
Keywords |
drought, microbial communities, microbial network, tropical forest, resistance, resilience |
Abstract |
Global climate changes such as prolonged duration and intensity of drought can lead to adverse ecological consequences in forests. Currently little is known about soil microbial community responses to such drought regimes in tropical forests. In this study, we examined the resistance and resilience of topsoil prokaryotic communities to a prolongation of the dry season in terms of diversity, community structure and co-occurrence patterns in a French Guianan tropical forest. Through excluding rainfall during and after the dry season, a simulated prolongation of the dry season by five months was compared to controls. Our results show that prokaryotic communities increasingly diverged from controls with the progression of rain exclusion. Furthermore, prolonged drought significantly affected microbial co-occurrence networks. However, both the composition and co-occurrence networks of soil prokaryotic communities immediately ceased to differ from controls when precipitation throughfall returned. This study thus suggests modest resistance but high resilience of microbial communities to a prolonged drought in tropical rainforest soils. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Oxford Academy |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
1032 |
Permanent link to this record |
|
|
|
Author |
Maréchaux, I.; Bonal, D.; Bartlett, M.K.; Burban, B.; Coste, S.; Courtois, E.A.; Dulormne, M.; Goret, J.-Y.; Mira, E.; Mirabel, A.; Sack, L.; Stahl, C.; Chave, J. |
Title |
Dry-season decline in tree sapflux is correlated with leaf turgor loss point in a tropical rainforest |
Type |
Journal Article |
Year |
2018 |
Publication |
Functional Ecology |
Abbreviated Journal |
Funct Ecol |
Volume |
32 |
Issue |
10 |
Pages |
2285-2297 |
Keywords |
drought tolerance; hydraulic conductance; sap flow; sapflux density; tropical trees; turgor loss point; water potential; wilting point |
Abstract |
Water availability is a key determinant of forest ecosystem function and tree species distributions. While droughts are increasing in frequency in many ecosystems, including in the tropics, plant responses to water supply vary with species and drought intensity and are therefore difficult to model. Based on physiological first principles, we hypothesized that trees with a lower turgor loss point (pi-tlp), that is, a more negative leaf water potential at wilting, would maintain water transport for longer into a dry season. We measured sapflux density of 22 mature trees of 10 species during a dry season in an Amazonian rainforest, quantified sapflux decline as soil water content decreased and tested its relationship to tree pi-tlp, size and leaf predawn and midday water potentials measured after the onset of the dry season. The measured trees varied strongly in the response of water use to the seasonal drought, with sapflux at the end of the dry season ranging from 37 to 117% (on average 83 +/- 5 %) of that at the beginning of the dry season. The decline of water transport as soil dried was correlated with tree pi-tlp (Spearman's rho > 0.63), but not with tree size or predawn and midday water potentials. Thus, trees with more drought-tolerant leaves better maintained water transport during the seasonal drought. Our study provides an explicit correlation between a trait, measurable at the leaf level, and whole-plant performance under drying conditions. Physiological traits such as pi-tlp can be used to assess and model higher scale processes in response to drying conditions. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Wiley/Blackwell (10.1111) |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0269-8463 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
doi: 10.1111/1365-2435.13188 |
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
830 |
Permanent link to this record |
|
|
|
Author |
Baraloto, C.; Morneau, F.; Bonal, D.; Blanc, L.; Ferry, B. |
Title |
Seasonal water stress tolerance and habitat associations within four neotropical tree genera |
Type |
Journal Article |
Year |
2007 |
Publication |
Ecology |
Abbreviated Journal |
Ecology |
Volume |
88 |
Issue |
2 |
Pages |
478-489 |
Keywords |
drought tolerance; French Guiana; photosynthetic capacity; phylogenetically independent contrast; relative growth rate; seasonally flooded forest; specific leaf area; torus translation method; tropical forest |
Abstract |
We investigated the relationship between habitat association and physiological performance in four congeneric species pairs exhibiting contrasting distributions between seasonally flooded and terra firme habitats in lowland tropical rain forests of French Guiana, including Virola and Iryanthera ( Myristicaceae), Symphonia ( Clusiaceae), and Eperua (Caesalpiniaceae). We analyzed 10-year data sets of mapped and measured saplings ( stems >= 150 cm in height and < 10 cm diameter at breast height [dbh]) and trees ( stems >= 10 cm dbh) across 37.5 ha of permanent plots covering a 300-ha zone, within which seasonally flooded areas ( where the water table never descends below 1 m) have been mapped. Additionally, we tested the response of growth, survival, and leaf functional traits of these species to drought and flood stress in a controlled experiment. We tested for habitat preference using a modi. cation of the torus translation method. Strong contrasting associations of the species pairs of Iryanthera, Virola, and Symphonia were observed at the sapling stage, and these associations strengthened for the tree stage. Neither species of Eperua was significantly associated with flooded habitats at the sapling stage, but E. falcata was significantly and positively associated with flooded forests at the tree stage, and trees of E. grandiflora were found almost exclusively in nonflooded habitats. Differential performance provided limited explanatory support for the observed habitat associations, with only congeners of Iryanthera exhibiting divergent sapling survival and tree growth. Seedlings of species associated with flooded forest tended to have higher photosynthetic capacity than their congeners at field capacity. In addition, they tended to have the largest reductions in leaf gas exchange and growth rate in response to experimental drought stress and the least reductions in response to experimental inundation. The corroboration of habitat association with differences in functional traits and, to a lesser extent, measures of performance provides an explanation for the regional coexistence of these species pairs. We suggest that specialization to seasonally flooded habitats may explain patterns of adaptive radiation in many tropical tree genera and thereby provide a substantial contribution to regional tree diversity. |
Address |
INRA, UMR Ecol Forets Guyane, Kourou, French Guiana, Email: baraloto@botany.ufl.edu |
Corporate Author |
|
Thesis |
|
Publisher |
ECOLOGICAL SOC AMER |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0012-9658 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
ISI:000245668400021 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
165 |
Permanent link to this record |
|
|
|
Author |
Aili, S.R.; Touchard, A.; Hayward, R.; Robinson, S.D.; Pineda, S.S.; Lalagüe, H.; Mrinalini; Vetter, I.; Undheim, E.A.B.; Kini, R.M.; Escoubas, P.; Padula, M.P.; Myers, G.S.A.; Nicholson, G.M. |
Title |
An integrated proteomic and transcriptomic analysis reveals the venom complexity of the bullet ant Paraponera clavata |
Type |
Journal Article |
Year |
2020 |
Publication |
Toxins |
Abbreviated Journal |
Toxins |
Volume |
12 |
Issue |
5 |
Pages |
|
Keywords |
DRG neurons; Hyaluronidase; Neurotoxins; Paraponeritoxin; Phospholipases; Rp-Hplc; alpha latrotoxin; ant venom; arginine kinase; cathepsin; contig; defensin 2; hyaluronidase; icarapin; metalloproteinase; neurotoxin; novel toxin like protein; phospholipase; phospholipase A2; poneratoxin; proteome; serine proteinase; transcriptome; unclassified drug; amino acid sequence; ant; Article; liquid chromatography-mass spectrometry; neurotoxicity; nonhuman; Paraponera clavata; protein expression; proteomics; sequence database; tandem mass spectrometry; transcriptomics; venom gland |
Abstract |
A critical hurdle in ant venom proteomic investigations is the lack of databases to comprehensively and specifically identify the sequence and function of venom proteins and peptides. To resolve this, we used venom gland transcriptomics to generate a sequence database that was used to assign the tandem mass spectrometry (MS) fragmentation spectra of venom peptides and proteins to specific transcripts. This was performed alongside a shotgun liquid chromatography-mass spectrometry (LC-MS/MS) analysis of the venom to confirm that these assigned transcripts were expressed as proteins. Through the combined transcriptomic and proteomic investigation of Paraponera clavata venom, we identified four times the number of proteins previously identified using 2D-PAGE alone. In addition to this, by mining the transcriptomic data, we identified several novel peptide sequences for future pharmacological investigations, some of which conform with inhibitor cysteine knot motifs. These types of peptides have the potential to be developed into pharmaceutical or bioinsecticide peptides. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. |
Address |
Faculty of Science, University of Nice, Nice, 06000, France |
Corporate Author |
|
Thesis |
|
Publisher |
Mdpi Ag |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
20726651 (Issn) |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
972 |
Permanent link to this record |
|
|
|
Author |
Zinger, L.; Taberlet, P.; Schimann, H.; Bonin, A.; Boyer, F.; De Barba, M.; Gaucher, P.; Gielly, L.; Giguet-Covex, C.; Iribar, A.; Réjou-Méchain, M.; Rayé, G.; Rioux, D.; Schilling, V.; Tymen, B.; Viers, J.; Zouiten, C.; Thuiller, W.; Coissac, E.; Chave, J. |
Title |
Body size determines soil community assembly in a tropical forest |
Type |
Journal Article |
Year |
2019 |
Publication |
Molecular Ecology |
Abbreviated Journal |
Mol Ecol |
Volume |
28 |
Issue |
3 |
Pages |
528-543 |
Keywords |
DNA metabarcoding; eDNA; French Guiana; multitaxa; neutral assembly; niche determinism; propagule size; soil diversity |
Abstract |
Tropical forests shelter an unparalleled biological diversity. The relative influence of environmental selection (i.e., abiotic conditions, biotic interactions) and stochastic?distance-dependent neutral processes (i.e., demography, dispersal) in shaping communities has been extensively studied for various organisms, but has rarely been explored across a large range of body sizes, in particular in soil environments. We built a detailed census of the whole soil biota in a 12-ha tropical forest plot using soil DNA metabarcoding. We show that the distribution of 19 taxonomic groups (ranging from microbes to mesofauna) is primarily stochastic, suggesting that neutral processes are prominent drivers of the assembly of these communities at this scale. We also identify aluminium, topography and plant species identity as weak, yet significant drivers of soil richness and community composition of bacteria, protists and to a lesser extent fungi. Finally, we show that body size, which determines the scale at which an organism perceives its environment, predicted the community assembly across taxonomic groups, with soil mesofauna assemblages being more stochastic than microbial ones. These results suggest that the relative contribution of neutral processes and environmental selection to community assembly directly depends on body size. Body size is hence an important determinant of community assembly rules at the scale of the ecological community in tropical soils and should be accounted for in spatial models of tropical soil food webs. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
John Wiley & Sons, Ltd (10.1111) |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0962-1083 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
873 |
Permanent link to this record |
|
|
|
Author |
Chaves, C.L.; Blanc-Jolivet, C.; Sebbenn, A.M.; Mader, M.; Meyer-Sand, B.R.V.; Paredes-Villanueva, K.; Honorio Coronado, E.N.; Garcia-Davila, C.; Tysklind, N.; Troispoux, V.; Massot, M.; Degen, B. |
Title |
Nuclear and chloroplastic SNP markers for genetic studies of timber origin for Hymenaea trees |
Type |
Journal Article |
Year |
2019 |
Publication |
Conservation Genetics Resources |
Abbreviated Journal |
Conserv. Gen. Res. |
Volume |
11 |
Issue |
3 |
Pages |
329-331 |
Keywords |
DNA fingerprints; Geographical origin; MiSeq; RADSeq |
Abstract |
We developed nuclear and chloroplastic single nucleotide polymorphism (SNP) and INDEL (insertion/deletion) markers using restriction associated DNA sequencing (RADSeq) and low coverage MiSeq genome sequencing to set up a genetic tracking method of the geographical origin of Hymenaea sp. From two initial sets of 358 and 32 loci used to genotype at least 94 individuals, a final set of 75 nSNPs, 50 cpSNPs and 6 INDELs identifying significant population structure was developed. © 2018, Springer Nature B.V. |
Address |
Departamento de Fitotecnia, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista, Ilha Solteira, SP, Brazil |
Corporate Author |
|
Thesis |
|
Publisher |
Springer Netherlands |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
18777252 (Issn) |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
908 |
Permanent link to this record |
|
|
|
Author |
Sebbenn, A.M.; Blanc-Jolivet, C.; Mader, M.; Meyer-Sand, B.R.V.; Paredes-Villanueva, K.; Honorio Coronado, E.N.; García-Dávila, C.; Tysklind, N.; Troispoux, V.; Delcamp, A.; Degen, B. |
Title |
Nuclear and plastidial SNP and INDEL markers for genetic tracking studies of Jacaranda copaia |
Type |
Journal Article |
Year |
2019 |
Publication |
Conservation Genetics Resources |
Abbreviated Journal |
Conserv. Gen. Res. |
Volume |
11 |
Issue |
3 |
Pages |
341-343 |
Keywords |
DNA fingerprints; Geographical origin; Jacaranda copaia; MassARRAY; MiSeq; RADSeq; Tropical timber |
Abstract |
Nuclear and plastidial single nucleotide polymorphism (SNP) and INDEL markers were developed using restriction associated DNA sequencing (RADSeq) and low coverage MiSeq genome sequencing for population genetics and timber tracking purposes in the Neotropical timber species Jacaranda copaia. We used 407 nuclear SNPs, 29 chloroplast, and 31 mitochondrial loci to genotype 92 individuals from Brazil, Bolivia, French Guiana, and Peru. Based on high amplification rates and genetic differentiation among populations, 113 nuclear SNPs, 11 chloroplast, and 4 mitochondrial loci were selected, and their use validated for genetic tracking of timber origin. |
Address |
BIOGECO, INRA, Univ. Bordeaux, Cestas, 33610, France |
Corporate Author |
|
Thesis |
|
Publisher |
Springer Netherlands |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
18777252 (Issn) |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
907 |
Permanent link to this record |
|
|
|
Author |
Zinger, L.; Chave, J.; Coissac, E.; Iribar, A.; Louisanna, E.; Manzi, S.; Schilling, V.; Schimann, H.; Sommeria-Klein, G.; Taberlet, P. |
Title |
Extracellular DNA extraction is a fast, cheap and reliable alternative for multi-taxa surveys based on soil DNA |
Type |
Journal Article |
Year |
2016 |
Publication |
Soil Biology and Biochemistry |
Abbreviated Journal |
Soil Biology and Biochemistry |
Volume |
96 |
Issue |
|
Pages |
16-19 |
Keywords |
DNA extraction protocol; DNA metabarcoding; Multi-taxa biodiversity; Tropical forest |
Abstract |
DNA metabarcoding on soil samples is increasingly used for large-scale and multi-taxa biodiversity studies. However, DNA extraction may be a major bottleneck for such wide uses. It should be cost/time effective and allow dealing with large sample volumes so as to maximise the representativeness of both micro- and macro-organisms diversity. Here, we compared the performances of a fast and cheap extracellular DNA extraction protocol with a total DNA extraction method in retrieving bacterial, eukaryotic and plant diversity from tropical soil samples of ca. 10 g. The total DNA extraction protocol yielded more high-quality DNA. Yet, the extracellular DNA protocol provided similar diversity assessments although it presented some differences in clades relative abundance and undersampling biases. We argue that extracellular DNA is a good compromise between cost, labor, and accuracy for high-throughput DNA metabarcoding studies of soil biodiversity. © 2016 Elsevier Ltd. |
Address |
INRA UMR ECOFOG, Kourou, French Guiana |
Corporate Author |
|
Thesis |
|
Publisher |
|
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
Export Date: 17 February 2016 |
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
663 |
Permanent link to this record |
|
|
|
Author |
Maggia, Marie-Eugénie ; Decaëns, Thibaud ; Lapied, Emmanuel ; Dupont, Lise ; Roy, Virginie ; Schimann, Heidy ; Orivel, Jérome ; Murienne, Jérôme ; Baraloto, Christophier ; Cottenie, Karl ; Steinke, Dirk |
Title |
At each site its diversity: DNA barcoding reveals remarkable earthworm diversity in neotropical rainforests of French Guiana |
Type |
Journal Article |
Year |
2021 |
Publication |
Applied Soil Ecology |
Abbreviated Journal |
|
Volume |
164 |
Issue |
|
Pages |
103932 |
Keywords |
DNA barcoding Tropical rainforest Community ecology Diversity level Sampling methods |
Abstract |
Despite their recognized essential role in soil, earthworms in tropical environments are still understudied. The aim of this study was to re-evaluate the diversity at the regional scale, as well as to investigate the environmental and spatial drivers of earthworm communities. We sampled earthworm communities across a range of habitats at six localities in French Guiana using three different sampling methods. We generated 1675 DNA barcodes and combined them with data from a previous study. Together, all sequences clustered into 119 MOTUs which were used as proxy to assess species richness. Only two MOTUs were common between the six localities and 20.2% were singletons, showing very high regional species richness and a high number of rare species. A canonical redundancy analysis was used to identify key drivers of the earthworm community composition. The RDA results and beta-diversity calculations both show strong species turnover and a strong spatial effect, resulting from dispersal limitations that are responsible for the current community composition. Sampling in different microhabitats allowed the discovery of 23 MOTUs that are exclusively found in decaying trunks and epiphytes, highlighting hidden diversity of earthworms outside of soil. |
Address |
|
Corporate Author |
|
Thesis |
|
Publisher |
Elsevier B.V. |
Place of Publication |
|
Editor |
|
Language |
|
Summary Language |
|
Original Title |
|
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0929-1393 |
ISBN |
|
Medium |
|
Area |
|
Expedition |
|
Conference |
|
Notes |
|
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
1055 |
Permanent link to this record |