Paola Ferreira Barbosa
@unb.br
Institute of Geosciences
University of Brasilia
My research interests include ore mineralogy, crystallographic texture analysis using EBSD (Electron Backscatter Diffraction), and automated mineralogical characterization using QEMSCAN and MLA. Currently, I am an Assistant Professor at the University of Brasília, where I teach Crystallography at the undergraduate level and Analytical Techniques for Minerals and Rocks at the graduate level in Geology. I also serve as the Extension Coordinator of the Institute of Geosciences, leading outreach initiatives focused on the dissemination and popularization of Science.
In addition, I am currently pursuing an MBA in Green Hydrogen and Energy Transition, and I am involved in projects that promote collaboration between the university and the industrial sector, fostering the integration of scientific knowledge with technological and sustainable development.
EDUCATION
Degree in Geological Engineering (Federal University of Ouro Preto)
PhD in Natural Sciences (Federal University of Ouro Preto)
Post-doc in Microscopy applied for projects of environment and mining areas (Microscopy Center of Universidade Federal de Minas Gerais)
RESEARCH, TEACHING, or OTHER INTERESTS
Geology
FUTURE PROJECTS
Phase transformation processes of iron oxides
I am seeking collaborators for a research project focused on the phase transformation processes of iron oxides. The study aims to investigate the structural, chemical, and textural evolution of iron oxides under varying physicochemical conditions, combining experimental methods with advanced microscopy and mineralogical analysis. The project seeks to better understand transformation pathways between hematite, goethite, and related phases, with implications for mineral exploration, environmental processes, and materials science.
Applications Invited
collaborators and students
Scopus Publications
Scopus Publications
Matheus Alves da Silva, Leonardo Lagoeiro, Carolina Cavalcante, and Paola Ferreira Barbosa
Elsevier BV
Cintia Fernandes Stumpf, Matheus Denezine, Paola Ferreira Barbosa, Sérgio Leandro de Vieira Toledo, Beatriz Bachega Groppo, and Tulio Gabriel Ramos Ribeiro
Elsevier BV
J.P.S. Brito, R.V. Santos, G.O. Gonçalves, P.F. Barbosa, C.E. Souza Cruz, C.A. Ushirobira, V.S. Souza, F. Richter, and C.J. Abreu
Elsevier BV
Flávia Priscila Souza Afonso, Leonardo Lagoeiro, Haakon Fossen, Paola Ferreira Barbosa, Celeste Bertassoni Pinto, and Camila Gomes Peçanha de Souza
Oxford University Press (OUP)
Abstract Deformation bands are common constituents of porous clastic fluid reservoirs. Various techniques have been used to study deformation band structure and the associated changes in porosity and permeability. However, the use of electron backscatter diffraction technique is limited. Thus, more information is needed regarding the crystallographic relationships between detrital crystals, which can significantly impact reservoir rock quality. We employ microscopic and microstructural investigation techniques to analyze the influence of cataclastic deformation bands on pore space. Porosity measurements of the Cretaceous Ilhas Group sandstone in NE Brazil, obtained through computerized microtomography, indicate that the undeformed domains exhibit a total porosity of up to 13%. In contrast, this porosity is slightly over 1% in the deformation bands. Scanning electron microscopy analyses revealed the presence of grain fragmentation and dissolution microstructures, along with cement-filling pre-existing pores. The electron backscatter diffraction analyses indicated extensive grain fragmentation and minimal contribution from intracrystalline plasticity as a deformation mechanism. However, the c axes of quartz crystals roughly align parallel to the orientation of the deformation band. In summary, we have confirmed and quantified the internal changes in a deformation band cluster, with grain size reduction and associated compaction as the main mechanism supported by quartz cementation.
Douglas Almeida Silveira, Paola Ferreira Barbosa, Cassiano Costa e Castro, Guilherme Ferreira da Silva, and Joseneusa Brilhante Rodrigues
Elsevier BV
Dagmar M. Hanz, Vanessa Cutts, Martha Paola Barajas‐Barbosa, Adam Algar, Carl Beierkuhnlein, Flavien Collart, José María Fernández‐Palacios, Richard Field, Dirk N. Karger, David R. Kienle,et al.
Wiley
AbstractAimOceanic islands possess unique floras with high proportions of endemic species. Island floras are expected to be severely affected by changing climatic conditions as species on islands have limited distribution ranges and small population sizes and face the constraints of insularity to track their climatic niches. We aimed to assess how ongoing climate change affects the range sizes of oceanic island plants, identifying species of particular conservation concern.LocationCanary Islands, Spain.MethodsWe combined species occurrence data from single‐island endemic, archipelago endemic and nonendemic native plant species of the Canary Islands with data on current and future climatic conditions. Bayesian Additive Regression Trees were used to assess the effect of climate change on species distributions; 71% (n = 502 species) of the native Canary Island species had models deemed good enough. To further assess how climate change affects plant functional strategies, we collected data on woodiness and succulence.ResultsSingle‐island endemic species were projected to lose a greater proportion of their climatically suitable area (x ̃ = −0.36) than archipelago endemics (x ̃ = −0.28) or nonendemic native species (x ̃ = −0.26), especially on Lanzarote and Fuerteventura, which are expected to experience less annual precipitation in the future. Moreover, herbaceous single‐island endemics were projected to gain less and lose more climatically suitable area than insular woody single‐island endemics. By contrast, we found that succulent single‐island endemics and nonendemic natives gain more and lose less climatically suitable area.Main ConclusionsWhile all native species are of conservation importance, we emphasise single‐island endemic species not characterised by functional strategies associated with water use efficiency. Our results are particularly critical for other oceanic island floras that are not constituted by such a vast diversity of insular woody species as the Canary Islands.
Martha Paola Barajas Barbosa, Dylan Craven, Patrick Weigelt, Pierre Denelle, Rüdiger Otto, Sandra Díaz, Jonathan Price, José María Fernández-Palacios, and Holger Kreft
Springer Science and Business Media LLC
Vanessa Cutts, Dagmar M. Hanz, Martha Paola Barajas‐Barbosa, Franziska Schrodt, Manuel J. Steinbauer, Carl Beierkuhnlein, Pierre Denelle, José María Fernández‐Palacios, Pierre Gaüzère, Matthias Grenié,et al.
Wiley
AbstractCurrent models of island biogeography treat endemic and non‐endemic species as if they were functionally equivalent, focussing primarily on species richness. Thus, the functional composition of island biotas in relation to island biogeographical variables remains largely unknown. Using plant trait data (plant height, leaf area and flower length) for 895 native species in the Canary Islands, we related functional trait distinctiveness and climate rarity for endemic and non‐endemic species and island ages. Endemics showed a link to climatically rare conditions that is consistent with island geological change through time. However, functional trait distinctiveness did not differ between endemics and non‐endemics and remained constant with island age. Thus, there is no obvious link between trait distinctiveness and occupancy of rare climates, at least for the traits measured here, suggesting that treating endemic and non‐endemic species as functionally equivalent in island biogeography is not fundamentally wrong.
Cleber Peralta Gomes, Roberto Ventura Santos, Lucieth Cruz Vieira, Elton Luiz Dantas, Igor Pureza Taveira, Paola Ferreira Barbosa, Diego Canídia Couto, Troy Rasbury, Frances Abbots, and Francisco Hilário Bezerra
Wiley
AbstractWe applied field structural data and isotope geochemical (δ13C, δ18O and 87Sr/86Sr) analyses to understand the relationship among calcite veins, fault damage zones and carbonate host rocks in a thrust fault damage zone in the Achado quarry, Irecê Basin in the São Francisco Craton, NE Brazil. Our results reveal three hydrological packages with different rheological behaviours in a stratified carbonate succession. The upper package includes the Achado fault damage zone that is characterised by interlayered dolomitised grainstones and mudstones. These rocks display high positive δ13C values (10‰–13‰), negative δ18O values (mean −6.34‰) and radiogenic (87Sr/86Sr) isotope values (0.70885–0.71519). A second package is marked by a cataclastic brittle shear zone lateral parallel to dolograinstones bedding. These rocks show low to positive δ13C values (−3.41‰ to +8.85‰), more positive δ18O values (mean −3.73‰) and radiogenic (87Sr/86Sr) isotope values (0.71039–0.71373). The lower package is characterised by well‐preserved pristine limestone succession that shows δ13C values ranging between −0.46‰ and +3.17‰, mean δ18O = −5.41‰ and less radiogenic 87Sr/86Sr values (0.70762–0.70818). In contrast to the upper and intermediate packages, rocks from the lower one exhibit very low permeability and behaved as a seal for fluid migration. Fluid flow occurred several times during basin evolution, for example along syn‐rift fault damage zones, bedding‐parallel carbonate breccia, thrust faults, cataclastic shear zones, synorogenic conjugate shear fractures or joints and opening mode I fracture‐fill calcite veins. These fractures allowed pervasive fluid flow in the porous intermediate cataclastic shear zone where fluids flowed and formed veins, as diffuse fluid flow in randomly oriented fracture swarms, or channelised fluid flow in aligned fracture corridors. They record significant centimetre‐scale to km‐scale hydrological behaviour within carbonate layers. Most carbonates that are associated with veins, fault damage zones and hydraulic breccia were formed by fluids of the same origin with low δ13C (−6.0 to −2.0‰) and δ18O (−6.0 to −8.5‰) values, and more radiogenic 87Sr/86Sr values compared to the carbonate host rocks.
Dagmar M. Hanz, Vanessa Cutts, Martha Paola Barajas‐Barbosa, Adam C. Algar, Carl Beierkuhnlein, José‐María Fernández‐Palacios, Richard Field, Holger Kreft, Manuel J. Steinbauer, Patrick Weigelt,et al.
Wiley
AbstractAimFunctional traits can help us to elucidate biogeographical and ecological processes driving assemblage structure. We analysed the functional diversity of plant species of different evolutionary origins across an island archipelago, along environmental gradients and across geological age, to assess functional aspects of island biogeographical theory.LocationCanary Islands, Spain.Major taxa studiedSpermatophytes.Time periodPresent day.MethodsWe collected data for four traits (plant height, leaf length, flower length and fruit length) associated with resource acquisition, competitive ability, reproduction and dispersal ability of 893 endemic, non‐endemic native and alien plant species (c. 43% of the Canary Island flora) from the literature. Linking these traits to species occurrences and composition across a 500 m × 500 m grid, we calculated functional diversity for endemic, non‐endemic native and alien assemblages using multidimensional functional hypervolumes and related the resulting patterns to climatic (humidity) and island biogeographical (geographical isolation, topographic complexity and geological age) gradients.ResultsTrait space of endemic and non‐endemic native species overlapped considerably, and alien species added novel trait combinations, expanding the overall functional space of the Canary Islands. We found that functional diversity of endemic plant assemblages was highest in geographically isolated and humid grid cells. Functional diversity of non‐endemic native assemblages was highest in less isolated and humid grid cells. In contrast, functional diversity of alien assemblages was highest in arid ecosystems. Topographic complexity and geological age had only a subordinate effect on functional diversity across floristic groups.Main conclusionsWe found that endemic and non‐endemic native island species possess similar traits, whereas alien species tend to expand functional space in ecosystems where they have been introduced. The spatial distribution of the functional diversity of floristic groups is very distinct across environmental gradients, indicating that species assemblages of different evolutionary origins thrive functionally in dissimilar habitats.
Moriá Caroline de Araújo, Adalene Moreira Silva, Paola Ferreira Barbosa, João Henrique Boniatti, Allan Früchting, Samuel Bouças do Lago, and Ram Horizonte Seixas Betancourt
Wiley
ABSTRACTThe epithermal Zn–Pb (Cu–Ag) deposit of Santa Maria represents a distal magmatic‐hydrothermal system, whose mineralizations are controlled by fault systems located in the sedimentary units of the upper Camaquã Basin, above the tectonic units of the Sul‐Riograndense Shield. The hydrothermal alteration zones contain illite, chlorite and pyrite, besides galena, sphalerite, chalcopyrite and bornite. To improve the knowledge of this mineral system, this work investigated the petrophysical footprints of samples representing the predominant lithology, altered rocks and hydrothermal mineralization. The core samples of the predominant lithology, altered rocks and hydrothermal deposit mineralizations were used to determine the following petrophysical properties, density, magnetic susceptibility, primary wave velocity, resistivity, conductivity and chargeability. Moreover, the quantitative evaluation of minerals by scanning electron microscopy coupled with an automated image analysis system allowed us to map lithological and alteration processes. The results indicate density as the most effective physical property to map lithology, hydrothermal alteration and the Zn–Pb (Cu–Au) mineralization. Furthermore, all studied physical properties have moderate effectiveness in the alteration zones of known geological and geophysical anomalies in the Santa Maria deposit. Chargeability could be used, especially when sulphides are disseminated, but additional geological factors complicate its interpretation. The mineralogical and petrophysical diversity of the Santa Maria deposit provided vital data for geological–geophysical interpretations while allowing the creation of a key exploration plan to investigate the Zn–Pb (Cu–Au) mineralization. Finally, petrophysics should be used in prospection to help understand complex geological processes, their overlapping subpopulations and to accelerate mineral research while reducing the use of technical and financial resources and expenditure on ineffective geophysical methodologies.
Victor Mota e Nogueira, Paola Ferreira Barbosa, Sathish Mayanna, Adalene Moreira Silva, Catarina Labouré Bemfica Toledo, Leonardo Evangelista Lagoeiro, and Luciano Mozer de Assis
MDPI AG
The most frequent crystallographic preferred orientations developed during the progressive phase transformation of magnetite-hematite-goethite are described and analyzed in two natural samples of banded iron formations from Carajás Mineral Province. Microtextures of martitized grains containing the three phases and the microplaty matrix were analyzed in a scanning electron microscope equipped with a detector for electron backscatter diffraction. For identifying the correlation between magnetite, hematite and goethite lattice and topotaxity during transformation, multiple orientation relationships between the three phases were tested and verified using three-dimensional misorientation analysis. The results show that basal planes of goethite coincide with basal planes of hematite, which coincide with octahedral planes of magnetite. This indicates that transformation between the three minerals happens topotactically, and the oxygen lattice framework is preserved in all members of the reaction as a form of crystallographic memory. As a result of progressive and cyclical changes in oxidation/reduction conditions, an assemblage of high-order orientation relationships is observed and assigned to a complex process of transformation twinning in-between phase transformation of magnetite, hematite and goethite. In the N4WS iron ore deposit, iron oxides/hydroxides from martitized grains work as susceptible markers of environmental changes still in solid state during the diagenetic process.
Rebecca Spake, Martha Paola Barajas-Barbosa, Shane A. Blowes, Diana E. Bowler, Corey T. Callaghan, Magda Garbowski, Stephanie D. Jurburg, Roel van Klink, Lotte Korell, Emma Ladouceur,et al.
Annual Reviews
Ecological thresholds comprise relatively fast changes in ecological conditions, with respect to time or external drivers, and are an attractive concept in both scientific and policy arenas. However, there is considerable debate concerning the existence, underlying mechanisms, and generalizability of ecological thresholds across a range of ecological subdisciplines. Here, we usethe general concept of scale as a unifying framework with which to systematically navigate the variability within ecological threshold research. We review the literature to show how the observational scale adopted in any one study, defined by its organizational level, spatiotemporal grain and extent, and analytical method, can influence threshold detection and magnitude. We highlight a need for nuance in synthetic studies of thresholds, which could improve our predictive understanding of thresholds. Nuance is also needed when translating threshold concepts into policies, including threshold contingencies and uncertainties.
Camila Santos Silveira, Leonardo Lagoeiro, Carolina Cavalcante, Rhander Taufner, Paola Ferreira Barbosa, Marcos Tadeu de Freitas Suita, and Thailli Conte
Elsevier BV
Diego Canídia do C. Couto, Paola F. Barbosa, Roberto V. Santos, Lucieth C. Vieira, Elton L. Dantas, Francisco H.R. Bezerra, Igor A.P. Taveira, and Cleber P. Gomes Júnior
Elsevier BV
C.L. Cazarin, R. van der Velde, R.V. Santos, J.J.G. Reijmer, F.H.R. Bezerra, G. Bertotti, V. La Bruna, D.C.C. Silva, D.L. de Castro, N.K. Srivastava,et al.
Elsevier BV
Vanessa Cutts, Dagmar M. Hanz, Martha P. Barajas‐Barbosa, Adam C. Algar, Manuel J. Steinbauer, Severin D. H. Irl, Holger Kreft, Patrick Weigelt, Jose María Fernandez Palacios, and Richard Field
Wiley
AbstractAimTrait‐based approaches are increasingly important in ecology and biogeography, but progress is often hampered by the availability of high‐quality quantitative trait data collected in the field. Alternative sources of trait information include scientific floras and taxonomic monographs. Here we test the reliability and usefulness of trait data acquired from scientific floras against trait values measured in the field, and those in TRY, the most comprehensive global plant trait database.LocationTenerife and La Palma, Canary Islands, Spain.MethodsWe measured leaf area and specific leaf area (SLA) in the field for 451 native vascular plant species and compared them with equivalent trait data digitised from the most recent and comprehensive guide of the Canarian flora, and data sourced from TRY. We regressed the field‐measured traits against their equivalents estimated from the literature and used the regression models from one island to predict the trait values on the other island.ResultsFor leaf area, linear models showed good agreement between values from the scientific flora and those measured in the field (r2 = 0.86). These models were spatially transferable across islands. In contrast, for SLA we found a weak relationship between field‐measured values and the best estimates from the scientific flora (r2 = 0.11). Insufficient data were available in the TRY database for our study area to calculate trait correlations with other data sources.ConclusionsScientific floras can act as useful data sources for quantitative plant trait data for some traits but not others, whilst the TRY database contains many traits, but is incomplete in species coverage for our study region, and oceanic islands in general.
Rhander Taufner, Leonardo Lagoeiro, Carolina Cavalcante, Paola Barbosa, and Camila Santos Silveira
Elsevier BV
Diego Ballesteros-Vivas, Jenny Paola Ortega-Barbosa, Fabián Parada-Alfonso, Sandra R.S. Ferreira, and Andrea del Pilar Sánchez-Camargo
Elsevier
Marcus Vinicius Machado, Thais de Paola Chequer Barbosa, Thais Camasmine Chrispino, Fabricia Junqueira das Neves, Gabriel Dias Rodrigues, Pedro Paulo da Silva Soares, and Antonio Claudio Lucas da Nóbrega
Wiley
The aim of this paper is to assess the integrated responses of ambulatory blood pressure (BP), cardiac autonomic modulation, spontaneous baroreflex sensitivity (BRS), and vascular reactivity after a single bout of resistance exercise (RE) in men with stage 2 hypertension who have never been treated before. Ten hypertensive men were subjected to a RE session of three sets of 20 repetitions and an intensity of 40% of the 1-repetition maximum (RM) test in seven different exercises. For the control (CTR) session, the volunteers were positioned on the exercise machines but did not perform any exercise. Forearm blood flow was measured by venous occlusion plethysmography. We also analyzed the heart rate variability (HRV), ambulatory BP, blood pressure variability (BPV), and BRS. All measurements were performed at different timepoints: baseline, 20 min, 80 min, and 24 h after both RE and CTR sessions. There were no differences in ambulatory BP over the 24 h between the RE and CTR sessions. However, the area under the curve of diastolic BP decreased after the RE session. Heart rate (HR) and cardiac output increased for up to 80 and 20 min after RE, respectively. Similarly, forearm blood flow, conductance, and vascular reactivity increased 20 min after RE ( p < 0.05 ). In contrast, HRV and BRS decreased immediately after exercise and remained lower for 20 min after RE. We conclude that a single bout of RE induced an increase in vascular reactivity and reduced the pressure load by attenuating AUC of DBP in hypertensive individuals who had never been treated with antihypertensive medications.
Moriá Caroline De Araújo, Adalene Moreira Silva, Paola Ferreira Barbosa, João Henrique Boniatti, Allan Früchting, Samuel Bouças Lago, and Ram Horizonte Seixas Betancourt
Universidade Federal do Rio de Janeiro
O entendimento da assinatura geofísica em depósitos torna-se essencial na prospecção mineral, uma vez que a compreensão do footprint em profundidade é cada mais necessário devido a alvos e depósitos superficiais estarem cada vez mais escassos. A integração de outros tipos de dados aos dados geofísicos pode auxiliar na criação de processos de interpretações a partir do conhecimento avançado da resposta geofísica de diferentes rochas, alterações hidrotermais e mineralizações que futuramente podem aumentar a descoberta de novos alvos ou novas abordagens na prospecção. Esta pesquisa tem como alvo o depósito epitermal de Pb-Zn-(Cu-Ag) de Santa Maria, situado no distrito de Minas do Camaquã, município de Caçapava do Sul, Rio Grande do Sul, Brasil. Trata-se de um sistema magmático-hidrotermal distal, com mineralizações controladas por sistemas de falhas em arenitos e conglomerados, que hospedam zonas de alterações hidrotermais que contêm ilita, clorita e pirita, além de galena, esfalerita, calcopirita e bornita. O objetivo principal é mapear a assinatura geofísica do depósito a partir da integração de dados geoquímicos e geofísicos das rochas encaixantes, alterações hidrotermais e mineralizações. A metodologia inicial aplicada consiste na seleção de amostras de furos de sondagens representativas da litologia predominante, das rochas alteradas e das mineralizações hidrotermais do depósito; submissão das amostras a análises geoquímicas de elementos maiores, traço e terras raras; e aquisição de dados geofísicos para serem integrados e interpretados. A magnetometria terrestre, a resistividade e a polarização induzida mostraram-se eficientes para mapear a assinatura geofísica do Depósito Santa Maria, principalmente em termos estruturais, uma vez que se identificou o possível controlador de mineralizações da área. A geoquímica facilitou o entendimento das variações geofísicas, pois a presença de sulfetos em maiores quantidades e presença de óxidos como K2O, Al2O3 e MgO utilizados para mapear zonas de ilita e clorita, possibilitaram interpretações e associações à geofísica da área. Toda a integração de dados proporcionou uma maior confiabilidade na caracterização da assinatura geofísica do depósito.
Diego Ballesteros-Vivas, Jenny Paola Ortega-Barbosa, Andrea del Pilar Sánchez-Camargo, Luis Ignacio Rodríguez-Varela, and Fabián Parada-Alfonso
Elsevier
Paola Barbosa, Leonardo Lagoeiro, and Victor Mota e Nogueira
International Union of Crystallography (IUCr)
The transformation behavior between iron oxides and oxyhydroxides like magnetite, hematite and goethite is still not entirely understood. Crystallographic similarities allow one to predict topotactic relationships between them. The related crystallographic aspects have been explored by means of electron backscatter diffraction (EBSD). Samples from natural aggregates of magnetite, hematite and goethite were collected from iron-formation rocks that outcrop in the southeast of Brazil, in a region known for large deposits of iron and other ores. EBSD misorientation data indicate a pronounced relationship between these iron phases. The transformation seems to be related to the oxygen framework. The original close-packed cubic arrangement of O atoms in magnetite changes to a hexagonal close-packed framework in hematite, i.e. {111} of magnetite is parallel to {0001} of hematite. The matrix in which the magnetite grains are embedded is made of aggregates of hematite and goethite. In the matrix, the coincidence observed in the magnetite grains is not observed. On the other hand, the well known twin boundary relationships already described for these mineral phases can be observed here as an orientation relationship in three-dimensional misorientation space. The spatial data of axis–angle pairs suggest that the twin boundaries serve as facilitating surfaces for phase transformation in the Fe–O–OH system. The main conclusion of this study is that the transformation occurred in the solid state with the newly transformed goethite inheriting the crystallographic orientations of the former crystals and that this phenomenon is better recognized by combining observations of misorientation relationships. In the matrix, such a relation is not observed and, for that reason, the minerals in the matrix are thought to have been formed by a different process, which might have involved dissolution and precipitation of the phase newly out of solution.
Martha Paola Barajas‐Barbosa, Patrick Weigelt, Michael Krabbe Borregaard, Gunnar Keppel, and Holger Kreft
Wiley
AbstractAimThe General Dynamic Model (GDM) links island biogeographical processes to island geological history. A key premise of the GDM implies that environmental factors shaping the ecology and evolution of biota on oceanic islands follow a hump‐shaped trend over the island's life span and drive dynamics in carrying capacity, species diversity and endemism. An important component of the GDM is environmental heterogeneity (EH), but its effects on insular diversity remain poorly understood. Here, we first quantified EH, tested whether EH follows the expected hump‐shaped trend along island ontogeny and evaluated how EH relates to plant diversity.Location135 oceanic islands of volcanic origin.TaxonVascular plants.MethodsWe calculated 20 EH metrics focusing on topographic and climatic components of EH, and compared whole‐island metrics (e.g. range) and moving‐window metrics (e.g. roughness). Using linear mixed‐effects models, we evaluated the trends of EH with island age and the EH–plant diversity relationship expected based on the GDM.ResultsOur analysis revealed some EH components to be collinear, for example, elevation and temperature heterogeneity but also that EH metrics capture different aspects of EH, for example, climatic gradients versus climatic complexity. EH generally followed a hump‐shaped trend with island age, peaking early during island ontogeny. Among the EH components, climatic heterogeneity had the strongest effect on plant species richness and elevational heterogeneity on endemism. Lastly, including EH metrics in GDMs (traditionally, only island age and area were included) improved their predictive power.Main conclusionsThe EH metrics compared here captured various attributes of the environment that influence insular plant diversity. In line with the GDM, our results strongly support a hump‐shaped relationship between EH and island age, suggesting that islands become highly heterogeneous early in their ontogeny. Finally, the contribution of EH to GDM‐based models of species richness and endemism suggests that EH is a main driver of the diversity of oceanic island biotas.
R.K. Weska, P.F. Barbosa, M.V.C. Martins, V.S. Souza, and E.L. Dantas
Elsevier BV