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Gardner EM, Bruun-Lund S, Niissalo M, Chantarasuwan B, Clement WL, Geri C, Harrison RD, Hipp AL, Holvoet M, Khew G, Kjellberg F, Liao S, Pederneiras LC, Peng YQ, Pereira JT, Phillipps Q, Ahmad Puad AS, Rasplus JY, Sang J, Schou SJ, Velautham E, Weiblen GD, Zerega NJC, Zhang Q, Zhang Z, Baraloto C, Rønsted N. Echoes of ancient introgression punctuate stable genomic lineages in the evolution of figs. Proc Natl Acad Sci U S A 2023; 120:e2222035120. [PMID: 37399402 PMCID: PMC10334730 DOI: 10.1073/pnas.2222035120] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 05/11/2023] [Indexed: 07/05/2023] Open
Abstract
Studies investigating the evolution of flowering plants have long focused on isolating mechanisms such as pollinator specificity. Some recent studies have proposed a role for introgressive hybridization between species, recognizing that isolating processes such as pollinator specialization may not be complete barriers to hybridization. Occasional hybridization may therefore lead to distinct yet reproductively connected lineages. We investigate the balance between introgression and reproductive isolation in a diverse clade using a densely sampled phylogenomic study of fig trees (Ficus, Moraceae). Codiversification with specialized pollinating wasps (Agaonidae) is recognized as a major engine of fig diversity, leading to about 850 species. Nevertheless, some studies have focused on the importance of hybridization in Ficus, highlighting the consequences of pollinator sharing. Here, we employ dense taxon sampling (520 species) throughout Moraceae and 1,751 loci to investigate phylogenetic relationships and the prevalence of introgression among species throughout the history of Ficus. We present a well-resolved phylogenomic backbone for Ficus, providing a solid foundation for an updated classification. Our results paint a picture of phylogenetically stable evolution within lineages punctuated by occasional local introgression events likely mediated by local pollinator sharing, illustrated by clear cases of cytoplasmic introgression that have been nearly drowned out of the nuclear genome through subsequent lineage fidelity. The phylogenetic history of figs thus highlights that while hybridization is an important process in plant evolution, the mere ability of species to hybridize locally does not necessarily translate into ongoing introgression between distant lineages, particularly in the presence of obligate plant-pollinator relationships.
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Hogan JA, Jusino MA, Smith ME, Corrales A, Song X, Hu YH, Yang J, Cao M, Valverde-Barrantes OJ, Baraloto C. Root-associated fungal communities are influenced more by soils than by plant-host root traits in a Chinese tropical forest. THE NEW PHYTOLOGIST 2023; 238:1849-1864. [PMID: 36808625 DOI: 10.1111/nph.18821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Accepted: 02/14/2023] [Indexed: 05/04/2023]
Abstract
Forest fungal communities are shaped by the interactions between host tree root systems and the associated soil conditions. We investigated how the soil environment, root morphological traits, and root chemistry influence root-inhabiting fungal communities in three tropical forest sites of varying successional status in Xishuangbanna, China. For 150 trees of 66 species, we measured root morphology and tissue chemistry. Tree species identity was confirmed by sequencing rbcL, and root-associated fungal (RAF) communities were determined using high-throughput ITS2 sequencing. Using distance-based redundancy analysis and hierarchical variation partitioning, we quantified the relative importance of two soil variables (site average total phosphorus and available phosphorus), four root traits (dry matter content, tissue density, specific tip abundance, and forks), and three root tissue elemental concentrations (nitrogen, calcium, and manganese) on RAF community dissimilarity. The root and soil environment collectively explained 23% of RAF compositional variation. Soil phosphorus explained 76% of that variation. Twenty fungal taxa differentiated RAF communities among the three sites. Soil phosphorus most strongly affects RAF assemblages in this tropical forest. Variation in root calcium and manganese concentrations and root morphology among tree hosts, principally an architectural trade-off between dense, highly branched vs less-dense, herringbone-type root systems, are important secondary determinants.
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Vleminckx J, Barrantes OV, Fortunel C, Paine CET, Bauman D, Engel J, Petronelli P, Dávila N, Rios M, Sandoval EHV, Mesones I, Allié E, Goret JY, Draper FC, Andino JEG, Béroujon S, Fine PVA, Baraloto C. Niche breadth of Amazonian trees increases with niche optimum across broad edaphic gradients. Ecology 2023:e4053. [PMID: 37079023 DOI: 10.1002/ecy.4053] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 03/21/2023] [Accepted: 03/23/2023] [Indexed: 04/21/2023]
Abstract
Understanding how biotic interactions and environmental filtering mediated by soil properties shape plant community assembly is a major challenge in ecology, especially when studying complex and hyper-diverse ecosystems like tropical forests. To shed light on the influence of both factors, we examined how the edaphic optimum of species (their niche position) relates to their edaphic range (their niche breadth) along different environmental gradients, and how this translates into functional strategies. Here we test four scenarios describing the shape of the niche breadth - niche position relationship, including one neutral scenario and three scenarios proposing different relative influences of abiotic and biotic factors on community assembly along a soil resource gradient. To do so, we used soil concentration data for five key nutrients (N, P, Ca, Mg and K), along with accurate measurements of 14 leaf, stem and root traits for 246 tree species inventoried in 101 plots located across Eastern (French Guiana) and Western (Peru) Amazonia. We found that species niche breadth increased linearly with species niche position along each soil nutrient gradient. This increase was associated with more resource acquisitive traits in the leaves and the roots for soil N, Ca, Mg and K concentration, while it was negatively associated with wood density for soil P concentration. These observations agreed with one of our hypothetical scenarios in which species with resource conservation traits are confined to the most nutrient-depleted soils (abiotic filter), but they are outperformed by faster-growing species on more fertile conditions (biotic filter). Our results refine and strengthen support for niche theories of species assembly, while providing an integrated approach to improve forest management policies.
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Hogan JA, Castañeda-Moya E, Lamb-Wotton L, Troxler T, Baraloto C. Water levels primarily drive variation in photosynthesis and nutrient use of scrub Red Mangroves in the southeastern Florida Everglades. TREE PHYSIOLOGY 2022; 42:797-814. [PMID: 35098315 DOI: 10.1093/treephys/tpab151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 11/11/2021] [Indexed: 06/14/2023]
Abstract
We investigated how mangrove-island micro-elevation (i.e., habitat: center vs edge) affects tree physiology in a scrub mangrove forest of the southeastern Everglades. We measured leaf gas exchange rates of scrub Rhizophora mangle L. trees monthly during 2019, hypothesizing that CO2 assimilation (Anet) and stomatal conductance (gsw) would decline with increasing water levels and salinity, expecting more considerable differences at mangrove-island edges than centers, where physiological stress is greatest. Water levels varied between 0 and 60 cm from the soil surface, rising during the wet season (May-October) relative to the dry season (November-April). Porewater salinity ranged from 15 to 30 p.p.t., being higher at mangrove-island edges than centers. Anet maximized at 15.1 μmol m-2 s-1, and gsw was typically <0.2 mol m-2 s-1, both of which were greater in the dry than the wet season and greater at island centers than edges, with seasonal variability being roughly equal to variation between habitats. After accounting for season and habitat, water level positively affected Anet in both seasons but did not affect gsw. Our findings suggest that inundation stress (i.e., water level) is the primary driver of variation in leaf gas exchange rates of scrub mangroves in the Florida Everglades, while also constraining Anet more than gsw. The interaction between inundation stress due to permanent flooding and habitat varies with season as physiological stress is alleviated at higher-elevation mangrove-island center habitats during the dry season. Freshwater inflows during the wet season increase water levels and inundation stress at higher-elevation mangrove-island centers, but also potentially alleviate salt and sulfide stress in soils. Thus, habitat heterogeneity leads to differences in nutrient and water acquisition and use between trees growing in island centers versus edges, creating distinct physiological controls on photosynthesis, which likely affect carbon flux dynamics of scrub mangroves in the Everglades.
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Hogan JA, Baraloto C, Ficken C, Clark MD, Weston DJ, Warren JM. The physiological acclimation and growth response of Populus trichocarpa to warming. PHYSIOLOGIA PLANTARUM 2021; 173:1008-1029. [PMID: 34272872 DOI: 10.1111/ppl.13498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 06/16/2021] [Accepted: 07/06/2021] [Indexed: 06/13/2023]
Abstract
Plant metabolic acclimation to thermal stress remains underrepresented in current global climate models. Gaps exist in our understanding of how metabolic processes (i.e., photosynthesis, respiration) acclimate over time and how aboveground versus belowground acclimation differs. We measured the thermal acclimation of Populus trichocarpa, comparing aboveground versus belowground physiology over time. Ninety genetically identical ramets were propagated in mesocosms that separated root and microbial components. After establishment at 25°C for 6 weeks, 60 clones were warmed +4 or +8°C and monitored for 10 weeks, measuring photosynthesis (A), leaf respiration (R), soil respiration (Rs ), root plus soil respiration (Rs+r ), and root respiration (Rr ). We observed thermal acclimation in both A and R, with rates initially increasing, then declining as the thermal photosynthetic optimum (Topt ) and the temperature-sensitivity (Q10 ) of respiration adjusted to warmer conditions. Photosynthetic acclimation was constructive, based on an increase in both Topt and peak A. Belowground, Rs+r decreased linearly with warming, while Rs rates declined abruptly, then remained constant with additional warming. Plant biomass was greatest at +4°C, with 30% allocated belowground. Rates of mass-based Rr were similar among treatments; however, root nitrogen declined at +8°C leading to less mass nitrogen-based Rr in that treatment. The Q10 -temperature relationship of Rr was affected by warming, leading to differing values among treatments. Aboveground acclimation exceeded belowground acclimation, and plant nitrogen-use mediated the acclimatory response. Results suggest that moderate climate warming (+4°C) may lead to acclimation and increased plant biomass production but increases in production could be limited with severe warming (+8°C).
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Baraloto C, Vleminckx J, Engel J, Petronelli P, Dávila N, RÍos M, Valderrama Sandoval EH, Mesones I, Guevara Andino JE, Fortunel C, Allie E, Paine CET, Dourdain A, Goret J, Valverde‐Barrantes OJ, Draper F, Fine PVA. Biogeographic history and habitat specialization shape floristic and phylogenetic composition across Amazonian forests. ECOL MONOGR 2021. [DOI: 10.1002/ecm.1473] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Draper FC, Costa FRC, Arellano G, Phillips OL, Duque A, Macía MJ, Ter Steege H, Asner GP, Berenguer E, Schietti J, Socolar JB, de Souza FC, Dexter KG, Jørgensen PM, Tello JS, Magnusson WE, Baker TR, Castilho CV, Monteagudo-Mendoza A, Fine PVA, Ruokolainen K, Coronado ENH, Aymard G, Dávila N, Sáenz MS, Paredes MAR, Engel J, Fortunel C, Paine CET, Goret JY, Dourdain A, Petronelli P, Allie E, Andino JEG, Brienen RJW, Pérez LC, Manzatto ÂG, Zambrana NYP, Molino JF, Sabatier D, Chave J, Fauset S, Villacorta RG, Réjou-Méchain M, Berry PE, Melgaço K, Feldpausch TR, Sandoval EV, Martinez RV, Mesones I, Junqueira AB, Roucoux KH, de Toledo JJ, Andrade AC, Camargo JL, Del Aguila Pasquel J, Santana FD, Laurance WF, Laurance SG, Lovejoy TE, Comiskey JA, Galbraith DR, Kalamandeen M, Aguilar GEN, Arenas JV, Guerra CAA, Flores M, Llampazo GF, Montenegro LAT, Gomez RZ, Pansonato MP, Moscoso VC, Vleminckx J, Barrantes OJV, Duivenvoorden JF, de Sousa SA, Arroyo L, Perdiz RO, Cravo JS, Marimon BS, Junior BHM, Carvalho FA, Damasco G, Disney M, Vital MS, Diaz PRS, Vicentini A, Nascimento H, Higuchi N, Van Andel T, Malhi Y, Ribeiro SC, Terborgh JW, Thomas RS, Dallmeier F, Prieto A, Hilário RR, Salomão RP, Silva RDC, Casas LF, Vieira ICG, Araujo-Murakami A, Arevalo FR, Ramírez-Angulo H, Torre EV, Peñuela MC, Killeen TJ, Pardo G, Jimenez-Rojas E, Castro W, Cabrera DG, Pipoly J, de Sousa TR, Silvera M, Vos V, Neill D, Vargas PN, Vela DM, Aragão LEOC, Umetsu RK, Sierra R, Wang O, Young KR, Prestes NCCS, Massi KG, Huaymacari JR, Gutierrez GAP, Aldana AM, Alexiades MN, Baccaro F, Céron C, Muelbert AE, Rios JMG, Lima AS, Lloyd JL, Pitman NCA, Gamarra LV, Oroche CJC, Fuentes AF, Palacios W, Patiño S, Torres-Lezama A, Baraloto C. Amazon tree dominance across forest strata. Nat Ecol Evol 2021; 5:757-767. [PMID: 33795854 DOI: 10.1038/s41559-021-01418-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 02/18/2021] [Indexed: 02/01/2023]
Abstract
The forests of Amazonia are among the most biodiverse plant communities on Earth. Given the immediate threats posed by climate and land-use change, an improved understanding of how this extraordinary biodiversity is spatially organized is urgently required to develop effective conservation strategies. Most Amazonian tree species are extremely rare but a few are common across the region. Indeed, just 227 'hyperdominant' species account for >50% of all individuals >10 cm diameter at 1.3 m in height. Yet, the degree to which the phenomenon of hyperdominance is sensitive to tree size, the extent to which the composition of dominant species changes with size class and how evolutionary history constrains tree hyperdominance, all remain unknown. Here, we use a large floristic dataset to show that, while hyperdominance is a universal phenomenon across forest strata, different species dominate the forest understory, midstory and canopy. We further find that, although species belonging to a range of phylogenetically dispersed lineages have become hyperdominant in small size classes, hyperdominants in large size classes are restricted to a few lineages. Our results demonstrate that it is essential to consider all forest strata to understand regional patterns of dominance and composition in Amazonia. More generally, through the lens of 654 hyperdominant species, we outline a tractable pathway for understanding the functioning of half of Amazonian forests across vertical strata and geographical locations.
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Vleminckx J, Fortunel C, Valverde‐Barrantes O, Timothy Paine CE, Engel J, Petronelli P, Dourdain AK, Guevara J, Béroujon S, Baraloto C. Resolving whole‐plant economics from leaf, stem and root traits of 1467 Amazonian tree species. OIKOS 2021. [DOI: 10.1111/oik.08284] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Damasco G, Baraloto C, Vicentini A, Daly DC, Baldwin BG, Fine PVA. Revisiting the hyperdominance of Neotropical tree species under a taxonomic, functional and evolutionary perspective. Sci Rep 2021; 11:9585. [PMID: 33953271 PMCID: PMC8099866 DOI: 10.1038/s41598-021-88417-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 03/30/2021] [Indexed: 11/29/2022] Open
Abstract
Recent studies have leveraged large datasets from plot-inventory networks to report a phenomenon of hyperdominance in Amazonian tree communities, concluding that few species are common and many are rare. However, taxonomic hypotheses may not be consistent across these large plot networks, potentially masking cryptic diversity and threatened rare taxa. In the current study, we have reviewed one of the most abundant putatively hyperdominant taxa, Protium heptaphyllum (Aubl.) Marchand (Burseraceae), long considered to be a taxonomically difficult species complex. Using morphological, genomic, and functional data, we present evidence that P. heptaphyllum sensu lato may represent eight separately evolving lineages, each warranting species status. Most of these lineages are geographically restricted, and few if any of them could be considered hyperdominant on their own. In addition, functional trait data are consistent with the hypothesis that trees from each lineage are adapted to distinct soil and climate conditions. Moreover, some of the newly discovered species are rare, with habitats currently experiencing rapid deforestation. We highlight an urgent need to improve sampling and methods for species discovery in order to avoid oversimplified assumptions regarding diversity and rarity in the tropics and the implications for ecosystem functioning and conservation.
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Valverde-Barrantes OJ, Authier L, Schimann H, Baraloto C. Root anatomy helps to reconcile observed root trait syndromes in tropical tree species. AMERICAN JOURNAL OF BOTANY 2021; 108:744-755. [PMID: 34028799 DOI: 10.1002/ajb2.1659] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 12/31/2020] [Indexed: 06/12/2023]
Abstract
PREMISE Studying the organization of functional traits in plant leaves and stems has revealed notable patterns linking function and form; however, evidence of similarly robust organization in root tissues remains controversial. We posit that anatomical traits in roots can provide insight on the overall organization of the root system. We hypothesized that size variation in the tissue outside the stele is related in a nonlinear fashion with functional traits associated with direct resource uptake, including a negative relationship with root architectural traits, and that similar relationships detected in tropical areas also hold true in other biomes. METHODS We addressed our hypotheses using empirical data from 24 tropical tree species in French Guiana, including anatomical measurements in first order roots and functional trait description for the entire fine root system. In addition, we compiled a global meta-analysis of root traits for 500+ forest species across tropical, subtropical, and temperate forests. RESULTS Our results supported the expected nonlinear relationships between cortical size and morphological traits and a negative linear trend with architectural traits. We confirmed a global negative relationship among specific root length (SRL), diameter, and tissue density, suggesting similar anatomical constraints in root systems across woody plants. However, the importance of factors varies across biomes, possibly related to the unequal phylogenetic representation across latitudes. CONCLUSIONS Our findings imply that the rhizocentric hypothesis can be a valuable approach to understand fine root trait syndromes and the evolution of absorptive roots in vascular plants.
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Esquivel-Muelbert A, Phillips OL, Brienen RJW, Fauset S, Sullivan MJP, Baker TR, Chao KJ, Feldpausch TR, Gloor E, Higuchi N, Houwing-Duistermaat J, Lloyd J, Liu H, Malhi Y, Marimon B, Marimon Junior BH, Monteagudo-Mendoza A, Poorter L, Silveira M, Torre EV, Dávila EA, Del Aguila Pasquel J, Almeida E, Loayza PA, Andrade A, Aragão LEOC, Araujo-Murakami A, Arets E, Arroyo L, Aymard C GA, Baisie M, Baraloto C, Camargo PB, Barroso J, Blanc L, Bonal D, Bongers F, Boot R, Brown F, Burban B, Camargo JL, Castro W, Moscoso VC, Chave J, Comiskey J, Valverde FC, da Costa AL, Cardozo ND, Di Fiore A, Dourdain A, Erwin T, Llampazo GF, Vieira ICG, Herrera R, Honorio Coronado E, Huamantupa-Chuquimaco I, Jimenez-Rojas E, Killeen T, Laurance S, Laurance W, Levesley A, Lewis SL, Ladvocat KLLM, Lopez-Gonzalez G, Lovejoy T, Meir P, Mendoza C, Morandi P, Neill D, Nogueira Lima AJ, Vargas PN, de Oliveira EA, Camacho NP, Pardo G, Peacock J, Peña-Claros M, Peñuela-Mora MC, Pickavance G, Pipoly J, Pitman N, Prieto A, Pugh TAM, Quesada C, Ramirez-Angulo H, de Almeida Reis SM, Rejou-Machain M, Correa ZR, Bayona LR, Rudas A, Salomão R, Serrano J, Espejo JS, Silva N, Singh J, Stahl C, Stropp J, Swamy V, Talbot J, Ter Steege H, Terborgh J, Thomas R, Toledo M, Torres-Lezama A, Gamarra LV, van der Heijden G, van der Meer P, van der Hout P, Martinez RV, Vieira SA, Cayo JV, Vos V, Zagt R, Zuidema P, Galbraith D. Author Correction: Tree mode of death and mortality risk factors across Amazon forests. Nat Commun 2021; 12:209. [PMID: 33397985 PMCID: PMC7782710 DOI: 10.1038/s41467-020-20537-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Esquivel-Muelbert A, Phillips OL, Brienen RJW, Fauset S, Sullivan MJP, Baker TR, Chao KJ, Feldpausch TR, Gloor E, Higuchi N, Houwing-Duistermaat J, Lloyd J, Liu H, Malhi Y, Marimon B, Marimon Junior BH, Monteagudo-Mendoza A, Poorter L, Silveira M, Torre EV, Dávila EA, Del Aguila Pasquel J, Almeida E, Loayza PA, Andrade A, Aragão LEOC, Araujo-Murakami A, Arets E, Arroyo L, Aymard C GA, Baisie M, Baraloto C, Camargo PB, Barroso J, Blanc L, Bonal D, Bongers F, Boot R, Brown F, Burban B, Camargo JL, Castro W, Moscoso VC, Chave J, Comiskey J, Valverde FC, da Costa AL, Cardozo ND, Di Fiore A, Dourdain A, Erwin T, Llampazo GF, Vieira ICG, Herrera R, Honorio Coronado E, Huamantupa-Chuquimaco I, Jimenez-Rojas E, Killeen T, Laurance S, Laurance W, Levesley A, Lewis SL, Ladvocat KLLM, Lopez-Gonzalez G, Lovejoy T, Meir P, Mendoza C, Morandi P, Neill D, Nogueira Lima AJ, Vargas PN, de Oliveira EA, Camacho NP, Pardo G, Peacock J, Peña-Claros M, Peñuela-Mora MC, Pickavance G, Pipoly J, Pitman N, Prieto A, Pugh TAM, Quesada C, Ramirez-Angulo H, de Almeida Reis SM, Rejou-Machain M, Correa ZR, Bayona LR, Rudas A, Salomão R, Serrano J, Espejo JS, Silva N, Singh J, Stahl C, Stropp J, Swamy V, Talbot J, Ter Steege H, Terborgh J, Thomas R, Toledo M, Torres-Lezama A, Gamarra LV, van der Heijden G, van der Meer P, van der Hout P, Martinez RV, Vieira SA, Cayo JV, Vos V, Zagt R, Zuidema P, Galbraith D. Tree mode of death and mortality risk factors across Amazon forests. Nat Commun 2020; 11:5515. [PMID: 33168823 PMCID: PMC7652827 DOI: 10.1038/s41467-020-18996-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 09/09/2020] [Indexed: 12/16/2022] Open
Abstract
The carbon sink capacity of tropical forests is substantially affected by tree mortality. However, the main drivers of tropical tree death remain largely unknown. Here we present a pan-Amazonian assessment of how and why trees die, analysing over 120,000 trees representing > 3800 species from 189 long-term RAINFOR forest plots. While tree mortality rates vary greatly Amazon-wide, on average trees are as likely to die standing as they are broken or uprooted-modes of death with different ecological consequences. Species-level growth rate is the single most important predictor of tree death in Amazonia, with faster-growing species being at higher risk. Within species, however, the slowest-growing trees are at greatest risk while the effect of tree size varies across the basin. In the driest Amazonian region species-level bioclimatic distributional patterns also predict the risk of death, suggesting that these forests are experiencing climatic conditions beyond their adaptative limits. These results provide not only a holistic pan-Amazonian picture of tree death but large-scale evidence for the overarching importance of the growth-survival trade-off in driving tropical tree mortality.
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Fichaux M, Vleminckx J, Courtois EA, Delabie J, Galli J, Tao S, Labrière N, Chave J, Baraloto C, Orivel J. Environmental determinants of leaf litter ant community composition along an elevational gradient. Biotropica 2020. [DOI: 10.1111/btp.12849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Valverde-Barrantes OJ, Maherali H, Baraloto C, Blackwood CB. Independent evolutionary changes in fine-root traits among main clades during the diversification of seed plants. THE NEW PHYTOLOGIST 2020; 228:541-553. [PMID: 32535912 DOI: 10.1111/nph.16729] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 05/19/2020] [Indexed: 06/11/2023]
Abstract
Changes in fine-root morphology are typically associated with transitions from the ancestral arbuscular mycorrhizal (AM) to the alternative ectomycorrhizal (ECM) or nonmycorrhizal (NM) associations. However, the modifications in root morphology may also coincide with new modifications in leaf hydraulics and growth habit during angiosperm diversification. These hypotheses have not been evaluated concurrently, and this limits our understanding of the causes of fine-root evolution. To explore the evolution of fine-root systems, we assembled a 600+ species database to reconstruct historical changes in seed plants over time. We utilise ancestral reconstruction approaches together with phylogenetically informed comparative analyses to test whether changes in fine-root traits were most strongly associated with mycorrhizal affiliation, leaf hydraulics or growth form. Our findings showed significant shifts in root diameter, specific root length and root tissue density as angiosperms diversified, largely independent from leaf changes or mycorrhizal affiliation. Growth form was the only factor associated with fine-root traits in statistical models including mycorrhizal association and leaf venation, suggesting substantial modifications in fine-root morphology during transitions from woody to nonwoody habits. Divergences in fine-root systems were crucial in the evolution of seed plant lineages, with important implications for ecological processes in terrestrial ecosystems.
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Draper FC, Baker TR, Baraloto C, Chave J, Costa F, Martin RE, Pennington RT, Vicentini A, Asner GP. Quantifying Tropical Plant Diversity Requires an Integrated Technological Approach. Trends Ecol Evol 2020; 35:1100-1109. [PMID: 32912632 DOI: 10.1016/j.tree.2020.08.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 08/04/2020] [Accepted: 08/12/2020] [Indexed: 10/23/2022]
Abstract
Tropical biomes are the most diverse plant communities on Earth, and quantifying this diversity at large spatial scales is vital for many purposes. As macroecological approaches proliferate, the taxonomic uncertainties in species occurrence data are easily neglected and can lead to spurious findings in downstream analyses. Here, we argue that technological approaches offer potential solutions, but there is no single silver bullet to resolve uncertainty in plant biodiversity quantification. Instead, we propose the use of artificial intelligence (AI) approaches to build a data-driven framework that integrates several data sources - including spectroscopy, DNA sequences, image recognition, and morphological data. Such a framework would provide a foundation for improving species identification in macroecological analyses while simultaneously improving the taxonomic process of species delimitation.
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Legeay J, Husson C, Boudier B, Louisanna E, Baraloto C, Schimann H, Marcais B, Buée M. Surprising low diversity of the plant pathogen Phytophthora in Amazonian forests. Environ Microbiol 2020; 22:5019-5032. [PMID: 32452108 DOI: 10.1111/1462-2920.15099] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 05/23/2020] [Indexed: 11/30/2022]
Abstract
The genus Phytophthora represents a group of plant pathogens with broad global distribution. The majority of them cause the collar and root-rot of diverse plant species. Little is known about Phytophthora communities in forest ecosystems, especially in the Neotropical forests where natural enemies could maintain the huge plant diversity via negative density dependence. We characterized the diversity of soil-borne Phytophthora communities in the North French Guiana rainforest and investigated how they are structured by host identity and environmental factors. In this little-explored habitat, 250 soil cores were sampled from 10 plots hosting 10 different plant families across three forest environments (Terra Firme, Seasonally Flooded and White Sand). Phytophthora diversity was studied using a baiting approach and metabarcoding (High-Throughput Sequencing) on environmental DNA extracted from both soil samples and baiting-leaves. These three approaches revealed very similar communities, characterized by an unexpected low diversity of Phytophthora species, with the dominance of two cryptic species close to Phytophthora heveae. As expected, the Phytophthora community composition of the French Guiana rainforest was significantly impacted by the host plant family and environment. However, these plant pathogen communities are very small and are dominated by generalist species, questioning their potential roles as drivers of plant diversity in these Amazonian forests.
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Sullivan MJP, Lewis SL, Affum-Baffoe K, Castilho C, Costa F, Sanchez AC, Ewango CEN, Hubau W, Marimon B, Monteagudo-Mendoza A, Qie L, Sonké B, Martinez RV, Baker TR, Brienen RJW, Feldpausch TR, Galbraith D, Gloor M, Malhi Y, Aiba SI, Alexiades MN, Almeida EC, de Oliveira EA, Dávila EÁ, Loayza PA, Andrade A, Vieira SA, Aragão LEOC, Araujo-Murakami A, Arets EJMM, Arroyo L, Ashton P, Aymard C. G, Baccaro FB, Banin LF, Baraloto C, Camargo PB, Barlow J, Barroso J, Bastin JF, Batterman SA, Beeckman H, Begne SK, Bennett AC, Berenguer E, Berry N, Blanc L, Boeckx P, Bogaert J, Bonal D, Bongers F, Bradford M, Brearley FQ, Brncic T, Brown F, Burban B, Camargo JL, Castro W, Céron C, Ribeiro SC, Moscoso VC, Chave J, Chezeaux E, Clark CJ, de Souza FC, Collins M, Comiskey JA, Valverde FC, Medina MC, da Costa L, Dančák M, Dargie GC, Davies S, Cardozo ND, de Haulleville T, de Medeiros MB, del Aguila Pasquel J, Derroire G, Di Fiore A, Doucet JL, Dourdain A, Droissart V, Duque LF, Ekoungoulou R, Elias F, Erwin T, Esquivel-Muelbert A, Fauset S, Ferreira J, Llampazo GF, Foli E, Ford A, Gilpin M, Hall JS, Hamer KC, Hamilton AC, Harris DJ, Hart TB, Hédl R, Herault B, Herrera R, Higuchi N, Hladik A, Coronado EH, Huamantupa-Chuquimaco I, Huasco WH, Jeffery KJ, Jimenez-Rojas E, Kalamandeen M, Djuikouo MNK, Kearsley E, Umetsu RK, Kho LK, Killeen T, Kitayama K, Klitgaard B, Koch A, Labrière N, Laurance W, Laurance S, Leal ME, Levesley A, Lima AJN, Lisingo J, Lopes AP, Lopez-Gonzalez G, Lovejoy T, Lovett JC, Lowe R, Magnusson WE, Malumbres-Olarte J, Manzatto ÂG, Marimon BH, Marshall AR, Marthews T, de Almeida Reis SM, Maycock C, Melgaço K, Mendoza C, Metali F, Mihindou V, Milliken W, Mitchard ETA, Morandi PS, Mossman HL, Nagy L, Nascimento H, Neill D, Nilus R, Vargas PN, Palacios W, Camacho NP, Peacock J, Pendry C, Peñuela Mora MC, Pickavance GC, Pipoly J, Pitman N, Playfair M, Poorter L, Poulsen JR, Poulsen AD, Preziosi R, Prieto A, Primack RB, Ramírez-Angulo H, Reitsma J, Réjou-Méchain M, Correa ZR, de Sousa TR, Bayona LR, Roopsind A, Rudas A, Rutishauser E, Abu Salim K, Salomão RP, Schietti J, Sheil D, Silva RC, Espejo JS, Valeria CS, Silveira M, Simo-Droissart M, Simon MF, Singh J, Soto Shareva YC, Stahl C, Stropp J, Sukri R, Sunderland T, Svátek M, Swaine MD, Swamy V, Taedoumg H, Talbot J, Taplin J, Taylor D, ter Steege H, Terborgh J, Thomas R, Thomas SC, Torres-Lezama A, Umunay P, Gamarra LV, van der Heijden G, van der Hout P, van der Meer P, van Nieuwstadt M, Verbeeck H, Vernimmen R, Vicentini A, Vieira ICG, Torre EV, Vleminckx J, Vos V, Wang O, White LJT, Willcock S, Woods JT, Wortel V, Young K, Zagt R, Zemagho L, Zuidema PA, Zwerts JA, Phillips OL. Long-term thermal sensitivity of Earth’s tropical forests. Science 2020; 368:869-874. [DOI: 10.1126/science.aaw7578] [Citation(s) in RCA: 121] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 03/05/2020] [Indexed: 01/21/2023]
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Fortunel C, Stahl C, Heuret P, Nicolini E, Baraloto C. Disentangling the effects of environment and ontogeny on tree functional dimensions for congeneric species in tropical forests. THE NEW PHYTOLOGIST 2020; 226:385-395. [PMID: 31872884 DOI: 10.1111/nph.16393] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 12/06/2019] [Indexed: 06/10/2023]
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.
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Schimann H, Vleminckx J, Baraloto C, Engel J, Jaouen G, Louisanna E, Manzi S, Sagne A, Roy M. Tree communities and soil properties influence fungal community assembly in neotropical forests. Biotropica 2020. [DOI: 10.1111/btp.12747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Subedi SC, Hogan JA, Ross MS, Sah JP, Baraloto C. Evidence for trait‐based community assembly patterns in hardwood hammock forests. Ecosphere 2019. [DOI: 10.1002/ecs2.2956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Coelho de Souza F, Dexter KG, Phillips OL, Pennington RT, Neves D, Sullivan MJP, Alvarez-Davila E, Alves Á, Amaral I, Andrade A, Aragao LEOC, Araujo-Murakami A, Arets EJMM, Arroyo L, Aymard C GA, Bánki O, Baraloto C, Barroso JG, Boot RGA, Brienen RJW, Brown F, Camargo JLC, Castro W, Chave J, Cogollo A, Comiskey JA, Cornejo-Valverde F, da Costa AL, de Camargo PB, Di Fiore A, Feldpausch TR, Galbraith DR, Gloor E, Goodman RC, Gilpin M, Herrera R, Higuchi N, Honorio Coronado EN, Jimenez-Rojas E, Killeen TJ, Laurance S, Laurance WF, Lopez-Gonzalez G, Lovejoy TE, Malhi Y, Marimon BS, Marimon-Junior BH, Mendoza C, Monteagudo-Mendoza A, Neill DA, Vargas PN, Peñuela Mora MC, Pickavance GC, Pipoly JJ, Pitman NCA, Poorter L, Prieto A, Ramirez F, Roopsind A, Rudas A, Salomão RP, Silva N, Silveira M, Singh J, Stropp J, Ter Steege H, Terborgh J, Thomas-Caesar R, Umetsu RK, Vasquez RV, Célia-Vieira I, Vieira SA, Vos VA, Zagt RJ, Baker TR. Evolutionary diversity is associated with wood productivity in Amazonian forests. Nat Ecol Evol 2019; 3:1754-1761. [PMID: 31712699 DOI: 10.1038/s41559-019-1007-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 09/16/2019] [Indexed: 11/09/2022]
Abstract
Higher levels of taxonomic and evolutionary diversity are expected to maximize ecosystem function, yet their relative importance in driving variation in ecosystem function at large scales in diverse forests is unknown. Using 90 inventory plots across intact, lowland, terra firme, Amazonian forests and a new phylogeny including 526 angiosperm genera, we investigated the association between taxonomic and evolutionary metrics of diversity and two key measures of ecosystem function: aboveground wood productivity and biomass storage. While taxonomic and phylogenetic diversity were not important predictors of variation in biomass, both emerged as independent predictors of wood productivity. Amazon forests that contain greater evolutionary diversity and a higher proportion of rare species have higher productivity. While climatic and edaphic variables are together the strongest predictors of productivity, our results show that the evolutionary diversity of tree species in diverse forest stands also influences productivity. As our models accounted for wood density and tree size, they also suggest that additional, unstudied, evolutionarily correlated traits have significant effects on ecosystem function in tropical forests. Overall, our pan-Amazonian analysis shows that greater phylogenetic diversity translates into higher levels of ecosystem function: tropical forest communities with more distantly related taxa have greater wood productivity.
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Grossiord C, Christoffersen B, Alonso-Rodríguez AM, Anderson-Teixeira K, Asbjornsen H, Aparecido LMT, Carter Berry Z, Baraloto C, Bonal D, Borrego I, Burban B, Chambers JQ, Christianson DS, Detto M, Faybishenko B, Fontes CG, Fortunel C, Gimenez BO, Jardine KJ, Kueppers L, Miller GR, Moore GW, Negron-Juarez R, Stahl C, Swenson NG, Trotsiuk V, Varadharajan C, Warren JM, Wolfe BT, Wei L, Wood TE, Xu C, McDowell NG. Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics. Oecologia 2019; 191:519-530. [DOI: 10.1007/s00442-019-04513-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 09/16/2019] [Indexed: 01/16/2023]
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Klarenberg G, Muñoz-Carpena R, Perz S, Baraloto C, Marsik M, Southworth J, Zhu L. A spatiotemporal natural-human database to evaluate road development impacts in an Amazon trinational frontier. Sci Data 2019; 6:93. [PMID: 31209221 PMCID: PMC6572834 DOI: 10.1038/s41597-019-0093-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 05/10/2019] [Indexed: 11/19/2022] Open
Abstract
Road construction and paving bring socio-economic benefits to receiving regions but can also be drivers of deforestation and land cover change. Road infrastructure often increases migration and illegal economic activities, which in turn affect local hydrology, wildlife, vegetation structure and dynamics, and biodiversity. To evaluate the full breadth of impacts from a coupled natural-human systems perspective, information is needed over a sufficient timespan to include pre- and post-road paving conditions. In addition, the spatial scale should be appropriate to link local human activities and biophysical system components, while also allowing for upscaling to the regional scale. A database was developed for the tri-national frontier in the Southwestern Amazon, where the Inter-Oceanic Highway was constructed through an area of high biological value and cultural diversity. Extensive socio-economic surveys and botanical field work are combined with remote sensing and reanalysis data to provide a rich and unique database, suitable for coupled natural-human systems research.
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Subedi SC, Ross MS, Sah JP, Redwine J, Baraloto C. Trait‐based community assembly pattern along a forest succession gradient in a seasonally dry tropical forest. Ecosphere 2019. [DOI: 10.1002/ecs2.2719] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Draper FC, Asner GP, Honorio Coronado EN, Baker TR, García-Villacorta R, Pitman NCA, Fine PVA, Phillips OL, Zárate Gómez R, Amasifuén Guerra CA, Flores Arévalo M, Vásquez Martínez R, Brienen RJW, Monteagudo-Mendoza A, Torres Montenegro LA, Valderrama Sandoval E, Roucoux KH, Ramírez Arévalo FR, Mesones Acuy Í, Del Aguila Pasquel J, Tagle Casapia X, Flores Llampazo G, Corrales Medina M, Reyna Huaymacari J, Baraloto C. Dominant tree species drive beta diversity patterns in western Amazonia. Ecology 2019; 100:e02636. [PMID: 30693479 DOI: 10.1002/ecy.2636] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 12/11/2018] [Accepted: 12/20/2018] [Indexed: 02/02/2023]
Abstract
The forests of western Amazonia are among the most diverse tree communities on Earth, yet this exceptional diversity is distributed highly unevenly within and among communities. In particular, a small number of dominant species account for the majority of individuals, whereas the large majority of species are locally and regionally extremely scarce. By definition, dominant species contribute little to local species richness (alpha diversity), yet the importance of dominant species in structuring patterns of spatial floristic turnover (beta diversity) has not been investigated. Here, using a network of 207 forest inventory plots, we explore the role of dominant species in determining regional patterns of beta diversity (community-level floristic turnover and distance-decay relationships) across a range of habitat types in northern lowland Peru. Of the 2,031 recorded species in our data set, only 99 of them accounted for 50% of individuals. Using these 99 species, it was possible to reconstruct the overall features of regional beta diversity patterns, including the location and dispersion of habitat types in multivariate space, and distance-decay relationships. In fact, our analysis demonstrated that regional patterns of beta diversity were better maintained by the 99 dominant species than by the 1,932 others, whether quantified using species-abundance data or species presence-absence data. Our results reveal that dominant species are normally common only in a single forest type. Therefore, dominant species play a key role in structuring western Amazonian tree communities, which in turn has important implications, both practically for designing effective protected areas, and more generally for understanding the determinants of beta diversity patterns.
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