| Records |
| Author |
Van Langenhove, L.; Depaepe, T.; Vicca, S.; van den Berge, J.; Stahl, C.; Courtois, E.; Weedon, J.; Urbina, I.; Grau, O.; Asensio, D.; Peñuelas, J.; Boeckx, P.; Richter, A.; Van Der Straeten, D.; Janssens, I.A. |
| Title |
Regulation of nitrogen fixation from free-living organisms in soil and leaf litter of two tropical forests of the Guiana shield |
Type |
Journal Article |
Year  |
2020 |
Publication |
Plant and Soil |
Abbreviated Journal |
Plant Soil |
| Volume |
450 |
Issue |
1-2 |
Pages |
93-110 |
| Keywords |
Free-living nitrogen fixation; French Guiana; Molybdenum; Nutrients; Phosphorus; Tropical forest; acetylene; leaf litter; molybdenum; nitrogen fixation; nutrient cycling; phosphorus; rainforest; reduction; soil biota; soil carbon; soil nitrogen; soil water; topographic effect; tropical forest; French Guiana |
| Abstract |
Background and aims: Biological fixation of atmospheric nitrogen (N2) is the main pathway for introducing N into unmanaged ecosystems. While recent estimates suggest that free-living N fixation (FLNF) accounts for the majority of N fixed in mature tropical forests, the controls governing this process are not completely understood. The aim of this study was to quantify FLNF rates and determine its drivers in two tropical pristine forests of French Guiana. Methods: We used the acetylene reduction assay to measure FLNF rates at two sites, in two seasons and along three topographical positions, and used regression analyses to identify which edaphic explanatory variables, including carbon (C), nitrogen (N), phosphorus (P) and molybdenum (Mo) content, pH, water and available N and P, explained most of the variation in FLNF rates. Results: Overall, FLNF rates were lower than measured in tropical systems elsewhere. In soils seasonal variability was small and FLNF rates differed among topographies at only one site. Water, P and pH explained 24% of the variation. In leaf litter, FLNF rates differed seasonally, without site or topographical differences. Water, C, N and P explained 46% of the observed variation. We found no regulatory role of Mo at our sites. Conclusions: Rates of FLNF were low in primary rainforest on poor soils on the Guiana shield. Water was the most important rate-regulating factor and FLNF increased with increasing P, but decreased with increasing N. Our results support the general assumption that N fixation in tropical lowland forests is limited by P availability. © 2019, The Author(s). |
| Address |
Department of Microbiology and Ecosystem Science, University of Vienna, Althanstr. 14, Vienna, 1090, Austria |
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Springer |
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0032079x (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
971 |
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| 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 |
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| 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 |
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| Publisher |
Mdpi Ag |
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20726651 (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
972 |
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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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| 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) |
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Edition |
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| ISSN |
18793150 (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
973 |
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| Author |
Birer, C.; Moreau, C.S.; Tysklind, N.; Zinger, L.; Duplais, C. |
| Title |
Disentangling the assembly mechanisms of ant cuticular bacterial communities of two Amazonian ant species sharing a common arboreal nest |
Type |
Journal Article |
| Year |
2020 |
Publication |
Molecular Ecology |
Abbreviated Journal |
Mol. Ecol. |
| Volume |
29 |
Issue |
7 |
Pages |
1372-1385 |
| Keywords |
ant gardens; bacterial communities; cuticular microbiome; insect cuticle; metabarcoding |
| Abstract |
Bacteria living on the cuticle of ants are generally studied for their protective role against pathogens, especially in the clade of fungus-growing ants. However, little is known regarding the diversity of cuticular bacteria in other ant host species, as well as the mechanisms leading to the composition of these communities. Here, we used 16S rRNA gene amplicon sequencing to study the influence of host species, species interactions and the pool of bacteria from the environment on the assembly of cuticular bacterial communities on two phylogenetically distant Amazonian ant species that frequently nest together inside the roots system of epiphytic plants, Camponotus femoratus and Crematogaster levior. Our results show that (a) the vast majority of the bacterial community on the cuticle is shared with the nest, suggesting that most bacteria on the cuticle are acquired through environmental acquisition, (b) 5.2% and 2.0% of operational taxonomic units (OTUs) are respectively specific to Ca. femoratus and Cr. levior, probably representing their respective core cuticular bacterial community, and (c) 3.6% of OTUs are shared between the two ant species. Additionally, mass spectrometry metabolomics analysis of metabolites on the cuticle of ants, which excludes the detection of cuticular hydrocarbons produced by the host, were conducted to evaluate correlations among bacterial OTUs and m/z ion mass. Although some positive and negative correlations are found, the cuticular chemical composition was weakly species-specific, suggesting that cuticular bacterial communities are prominently environmentally acquired. Overall, our results suggest the environment is the dominant source of bacteria found on the cuticle of ants. © 2020 John Wiley & Sons Ltd |
| Address |
Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, PSL Université Paris, Paris, France |
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Thesis |
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| Publisher |
Blackwell Publishing Ltd |
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Edition |
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| ISSN |
09621083 (Issn) |
ISBN |
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Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
975 |
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| Author |
Lang, G.; Marcon, E.; Puech, F. |
| Title |
Distance-based measures of spatial concentration: introducing a relative density function |
Type |
Journal Article |
| Year |
2020 |
Publication |
Annals of Regional Science |
Abbreviated Journal |
Ann. Reg. Sci. |
| Volume |
64 |
Issue |
2 |
Pages |
243-265 |
| Keywords |
Agglomeration; Aggregation; Economic geography; Point patterns; Spatial concentration; accuracy assessment; econometrics; economic activity; economic geography; industrial agglomeration; industrial location; location decision; spatial analysis; spatial distribution |
| Abstract |
For more than a decade, distance-based methods have been widely employed and constantly improved in spatial economics. These methods are a very useful tool for accurately evaluating the spatial distribution of economic activity. We introduce a new distance-based statistical measure for evaluating the spatial concentration of industries. The m function is the first relative density function to be proposed in economics. This tool supplements the typology of distance-based methods recently drawn up by Marcon and Puech (J Econ Geogr 3(4):409–428, 2003). By considering several simulated and real examples, we show the advantages and the limits of the m function for detecting spatial structures in economics. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. |
| Address |
RITM, Univ. Paris-Sud, Université Paris-Saclay and CREST, Sceaux, France |
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| Publisher |
Springer |
Place of Publication |
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Edition |
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05701864 (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
976 |
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| Author |
Fortunel, C.; Stahl, C.; Heuret, P.; Nicolini, E.; Baraloto, C. |
| Title |
Disentangling the effects of environment and ontogeny on tree functional dimensions for congeneric species in tropical forests |
Type |
Journal Article |
| Year |
2020 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
| Volume |
226 |
Issue |
2 |
Pages |
385-395 |
| Keywords |
chemistry; developmental stage; habitats; Micropholis; morphology; physiology; plant traits; seasons; developmental stage; ecosystem function; forest ecosystem; habitat selection; habitat structure; nutrient availability; ontogeny; physiological response; soil water; taxonomy; tropical forest; Amazonia |
| Abstract |
Soil water and nutrient availability are key drivers of tree species distribution and forest ecosystem functioning, with strong species differences in water and nutrient use. Despite growing evidence for intraspecific trait differences, it remains unclear under which circumstances the effects of environmental gradients trump those of ontogeny and taxonomy on important functional dimensions related to resource use, particularly in tropical forests. Here, we explore how physiological, chemical, and morphological traits related to resource use vary between life stages in four species within the genus Micropholis that is widespread in lowland Amazonia. Specifically, we evaluate how environment, developmental stage, and taxonomy contribute to single-trait variation and multidimensional functional strategies. We find that environment, developmental stage, and taxonomy differentially contribute to functional dimensions. Habitats and seasons shape physiological and chemical traits related to water and nutrient use, whereas developmental stage and taxonomic identity impact morphological traits –especially those related to the leaf economics spectrum. Our findings suggest that combining environment, ontogeny, and taxonomy allows for a better understanding of important functional dimensions in tropical trees and highlights the need for integrating tree physiological and chemical traits with classically used morphological traits to improve predictions of tropical forests’ responses to environmental change. © 2019 The Authors New Phytologist © 2019 New Phytologist Trust |
| Address |
Department of Biological Sciences, Florida International University, Miami, FL 33133, United States |
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Thesis |
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| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
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Series Issue |
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Edition |
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0028646x (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
977 |
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Srivastava, D.S.; Céréghino, R.; Trzcinski, M.K.; MacDonald, A.A.M.; Marino, N.A.C.; Mercado, D.A.; Leroy, C.; Corbara, B.; Romero, G.Q.; Farjalla, V.F.; Barberis, I.M.; Dézerald, O.; Hammill, E.; Atwood, T.B.; Piccoli, G.C.O.; Ospina-Bautista, F.; Carrias, J.-F.; Leal, J.S.; Montero, G.; Antiqueira, P.A.P.; Freire, R.; Realpe, E.; Amundrud, S.L.; de Omena, P.M.; Campos, A.B.A. |
| Title |
Ecological response to altered rainfall differs across the Neotropics |
Type |
Journal Article |
| Year |
2020 |
Publication |
Ecology |
Abbreviated Journal |
Ecology |
| Volume |
101 |
Issue |
4 |
Pages |
e02984 |
| Keywords |
contingency; distributed experiment; freshwater; global change biology; macroinvertebrates; phytotelmata; precipitation; aquatic ecosystem; climate change; climate conditions; ecosystem response; extreme event; functional group; invertebrate; Neotropical Region; rainfall; species pool; Bacteria (microorganisms); Invertebrata; rain; animal; climate change; drought; ecosystem; invertebrate; Animals; Climate Change; Droughts; Ecosystem; Invertebrates; Rain |
| Abstract |
There is growing recognition that ecosystems may be more impacted by infrequent extreme climatic events than by changes in mean climatic conditions. This has led to calls for experiments that explore the sensitivity of ecosystems over broad ranges of climatic parameter space. However, because such response surface experiments have so far been limited in geographic and biological scope, it is not clear if differences between studies reflect geographic location or the ecosystem component considered. In this study, we manipulated rainfall entering tank bromeliads in seven sites across the Neotropics, and characterized the response of the aquatic ecosystem in terms of invertebrate functional composition, biological stocks (total invertebrate biomass, bacterial density) and ecosystem fluxes (decomposition, carbon, nitrogen). Of these response types, invertebrate functional composition was the most sensitive, even though, in some sites, the species pool had a high proportion of drought-tolerant families. Total invertebrate biomass was universally insensitive to rainfall change because of statistical averaging of divergent responses between functional groups. The response of invertebrate functional composition to rain differed between geographical locations because (1) the effect of rainfall on bromeliad hydrology differed between sites, and invertebrates directly experience hydrology not rainfall and (2) the taxonomic composition of some functional groups differed between sites, and families differed in their response to bromeliad hydrology. These findings suggest that it will be difficult to establish thresholds of “safe ecosystem functioning” when ecosystem components differ in their sensitivity to climatic variables, and such thresholds may not be broadly applicable over geographic space. In particular, ecological forecast horizons for climate change may be spatially restricted in systems where habitat properties mediate climatic impacts, and those, like the tropics, with high spatial turnover in species composition. © 2020 by the Ecological Society of America |
| Address |
Departamento de Ciencias Biológicas, Universidad de Caldas, Caldas, 170001, Colombia |
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| Publisher |
Ecological Society of America |
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Edition |
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| ISSN |
00129658 (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
979 |
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| Author |
Shepard, W.D.; Clavier, S.; Cerdan, A. |
| Title |
A generic key to the known larval elmidae (Insecta: Coleoptera) of French Guiana |
Type |
Journal Article |
| Year |
2020 |
Publication |
Papeis Avulsos de Zoologia |
Abbreviated Journal |
Pap. Avulsos Zool. |
| Volume |
60 |
Issue |
Special |
Pages |
e202060 |
| Keywords |
Biodiversity; Identification; Immatures; Neotropical; Survey |
| Abstract |
An identification key is provided for 21 larval types of Elmidae (riffle beetles) known to occur in French Guiana. Not all elmid genera known to occur in French Guiana are known in the larval stage. Nor are all the known larval types assigned to known elmid genera. © 2020, Universidade de Sao Paulo. All rights reserved. |
| Address |
CNRS, UMR EcoFog (AgroParisTech, CIRAD, INRA, Université des Antilles, Université de Guyane), Kourou Cedex, France |
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Thesis |
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| Publisher |
Universidade de Sao Paulo |
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Series Issue |
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Edition |
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| ISSN |
00311049 (Issn) |
ISBN |
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Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
980 |
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| Author |
Sommeria-Klein, G.; Zinger, L.; Coissac, E.; Iribar, A.; Schimann, H.; Taberlet, P.; Chave, J. |
| Title |
Latent Dirichlet Allocation reveals spatial and taxonomic structure in a DNA-based census of soil biodiversity from a tropical forest |
Type |
Journal Article |
| Year |
2020 |
Publication |
Molecular Ecology Resources |
Abbreviated Journal |
Mol. Ecol. Resour. |
| Volume |
20 |
Issue |
2 |
Pages |
371-386 |
| Keywords |
community ecology; environmental DNA; metabarcoding; OTU presence–absence; soil microbiome; topic modelling; bacterium; biodiversity; biology; classification; eukaryote; fungus; genetics; high throughput sequencing; isolation and purification; microbiology; parasitology; procedures; soil; Bacteria; Biodiversity; Computational Biology; Eukaryota; Fungi; High-Throughput Nucleotide Sequencing; Soil; Soil Microbiology |
| Abstract |
High-throughput sequencing of amplicons from environmental DNA samples permits rapid, standardized and comprehensive biodiversity assessments. However, retrieving and interpreting the structure of such data sets requires efficient methods for dimensionality reduction. Latent Dirichlet Allocation (LDA) can be used to decompose environmental DNA samples into overlapping assemblages of co-occurring taxa. It is a flexible model-based method adapted to uneven sample sizes and to large and sparse data sets. Here, we compare LDA performance on abundance and occurrence data, and we quantify the robustness of the LDA decomposition by measuring its stability with respect to the algorithm's initialization. We then apply LDA to a survey of 1,131 soil DNA samples that were collected in a 12-ha plot of primary tropical forest and amplified using standard primers for bacteria, protists, fungi and metazoans. The analysis reveals that bacteria, protists and fungi exhibit a strong spatial structure, which matches the topographical features of the plot, while metazoans do not, confirming that microbial diversity is primarily controlled by environmental variation at the studied scale. We conclude that LDA is a sensitive, robust and computationally efficient method to detect and interpret the structure of large DNA-based biodiversity data sets. We finally discuss the possible future applications of this approach for the study of biodiversity. © 2019 John Wiley & Sons Ltd |
| Address |
Laboratoire d’Ecologie des Forêts de Guyane (EcoFoG, UMR 745), INRA, AgroParisTech, CIRAD, CNRS, University of the French West Indies, University of French Guiana, Kourou, France |
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Blackwell Publishing Ltd |
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Edition |
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1755098x (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
981 |
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| Author |
Urbina, I.; Grau, O.; Sardans, J.; Ninot, J.M.; Peñuelas, J. |
| Title |
Encroachment of shrubs into subalpine grasslands in the Pyrenees changes the plant-soil stoichiometry spectrum |
Type |
Journal Article |
| Year |
2020 |
Publication |
Plant and Soil |
Abbreviated Journal |
Plant Soil |
| Volume |
448 |
Issue |
1-2 |
Pages |
37-53 |
| Keywords |
Nutrient stocks; Plant strategy; Plant-soil stoichiometry; Shrub encroachment; Subalpine grassland succession; aboveground biomass; biogeochemical cycle; carbon sequestration; ectomycorrhiza; fungus; grass; nitrogen; nutrient uptake; shrub; soil-vegetation interaction; stoichiometry; subalpine environment; succession; Europe; Pyrenees; Fungi |
| Abstract |
Aims: Shrub encroachment has been reported over a large proportion of the subalpine grasslands across Europe and is expected to have an important impact on the biogeochemical cycle of these ecosystems. We investigated the stoichiometric changes in the plant-soil system along the succession (e.g. increase in encroachment from unencroached grassland to mature shrubland) at two contrasting sites in the Pyrenees. Methods: We analyzed the chemical composition (C, N,15N, P, K, Ca, Mg and Fe) in the soil and in the aboveground plant compartments (leaves, leaf-litter and stems) of the main herbaceous species and shrubs at three contrasting stages of the succession: unencroached grassland, young shrubland and mature shrubland. Results: The plant-soil stoichiometry spectrum differed between the successional stages. Shrub encroachment generally increased the concentration of C and Ca and the C:N ratio and often reduced to concentrations of N, P and K in the leaves and leaf-litter, while several soil nutrient concentrations (N, P, K Ca and Mg) decreased. The stocks of C, N, P, Ca, and Mg in the total aboveground biomass increased with encroachment. Conclusions: Shrub encroachment favored the dominance of long-lived species with low concentrations of N and P in the plant-soil compartments, high C:nutrient ratios in the aboveground biomass and increase the uptake of N through ericoid or ectomycorrhizal fungi. We highlight the role of shrubs in the sequestration of C and nutrients through the allocation to the aboveground biomass. The changes in plant-soil elemental composition and stocks suggest a slowdown of the biogeochemical cycles in the subalpine mountain areas where shrub encroachment occurred. © 2020, Springer Nature Switzerland AG. |
| Address |
Biodiversity Research Institute (IRBio) and Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Catalonia, Spain |
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Springer |
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0032079x (Issn) |
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no |
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EcoFoG @ webmaster @ |
Serial |
983 |
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