Paulo Eugênio Oliveira

Paulo Eugênio Oliveira
Universidade Federal de Uberlândia (UFU) | UFU · Institute of Biology (IB)

PhD

About

199
Publications
98,248
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4,270
Citations
Citations since 2016
76 Research Items
2297 Citations
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20162017201820192020202120220100200300400
20162017201820192020202120220100200300400

Publications

Publications (199)
Article
Full-text available
Hybridization and changes in ploidy have been associated with shifts from sexuality to apomixis, and may explain isolation among populations and species. Hybrids resulting from interploidy crosses may contribute to a broader understanding of how these populations and species have originated and evolved. Stomatal morphometrics and flow cytometry ana...
Article
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Wetlands are among the most important ecosystems in the world in terms of endemic biodiversity, carbon storage and hydrological process. Veredas wetlands are distributed across the Brazilian savanna (i.e. Cerrado biome) and are permanently protected areas. Veredas wetlands have a hydromorphic soil, providing water to the main rivers of central Braz...
Article
Morphological niche partitioning between related syntopic plants that are distylous (with short- and long-styled morphs) is complex. Owing to differences in the heights of stigmas and anthers, each floral morph must place pollen onto two distinct parts of the body of the pollinator. This led us to hypothesize that such partitioning should be more a...
Chapter
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Some angiosperms exhibit the ability to form seeds asexually through apomixis. This reproduction mode is more common in some families such as Melastomataceae, in which 64 autonomous apomictic species have been identified within different lineages. The Henrietteeae, Lavoisiereae, Marcetieae, Merianieae, Melastomateae, Miconieae, and Rhexieae tribes...
Article
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Distyly is a floral polymorphism with reciprocal placement of male and female structures, heteromorphic self-incompatibility, and other ancillary traits. However, breeding system breakdowns and loss of polymorphism are common. Here we traced the diversification of breeding strategies in the type genera of tribes Palicoureeae and Psychotrieae and di...
Article
Plants establish pollination interactions with different groups of animals, including nocturnal ones that establish interactions with economically valuable and culturally important crops, as well as wild plants of conservation concern. Despite the considerable number of studies addressing the structure and dynamic of pollination networks, nocturnal...
Article
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Since Darwin, very long and narrow floral tubes have been known to represent the main floral morphological feature for specialized long-tongued hawkmoth pollination. However, specialization may be driven by other contrivances instead of floral tube morphology. Asclepiads are plants with a complex floral morphology where primary hawkmoth pollination...
Article
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Distyly is a floral polymorphism that promotes cross-pollination through precise pollination. Psychotria is a mostly tropical genus of distylous Rubiaceae. Although widely studied in Brazil, some regions/species are still poorly explored, which hinders the understanding of distyly system along a greater geographical range. Here, we studied a subtro...
Article
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Florivores and rainfall generally have negative impacts on plant fecundity. However, in some cases, they can mediate fruit set. Some plants face severe pollen-limited fecundity and any additional fruit set, even if from self-pollination, can be advantageous. This is the case in some tropical deceptive orchids, such as the threatened Cyrtopodium hat...
Article
Heterostyly is a polymorphism in which populations comprise two (distyly) or three (tristyly) floral morphs with reciprocal positioning of the height of the anthers and stigmas (reciprocal herkogamy). Such reciprocal herkogamy permits precise pollen placement on pollinators’ bodies and pollination success by promoting disassortative pollen transfer...
Article
BREEDING SYSTEMS AND POLLINATION OF THE PSYCHOTRIA CAPITATA RUIZ & PAVON (RUBIACEAE): A CASE THE TYPICAL DISTYLY IN CERRADO: The phenotypic integration observed in flowers is an evolutionary strategy that aims to increase the pollen flow between individuals, favoring the crossing and maintenance of genetic variability. This success is directly rela...
Article
Full-text available
• Apomixis is the asexual production of seeds by plants and, in theory, would render low genetic diversity and even clonal lineages. However, recent studies have shown otherwise, although is not always clear where the genetic diversity of obligate apomicts comes from. • We evaluated the genetic diversity among sister seedlings of M. albicans, an ob...
Article
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Apomixis, the asexual formation of embryos and seeds, occurs in approximately 18% of angiosperm families. Melastomataceae exhibits a remarkable number of apomictic species, distributed among different tribes. This mode of reproduction has been elucidated in Miconieae, but remains unclarified for other groups, such as Microlicieae. Although apomixis...
Article
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Changes in the vegetation of Brazilian Cerrado may occur over time. However, long-term dynamics are not fully understood yet, especially woody plant encroachment (WPE). The objective of this study was to examine changes in vegetation structure in a preserved area in Triângulo Mineiro region, within the southern Brazilian Cerrado domain, over 32 yea...
Article
The diversity of plant species in blooming throughout the year is a way of ensuring the presence of floral resources, as the spatiotemporal distribution of these resources assists in the movement of pollinators and guarantees local ecosystem services. The aim of this study was to describe the seasonal variations in the vertical distribution of the...
Article
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Functional traits can determine pairwise species interactions, such as those between plants and pollinators. However, the effects of biogeography and evolutionary history on trait‐matching and trait‐mediated resource specialization remain poorly understood. We compiled a database of 93 mutualistic hummingbird‐plant networks (including 181 hummingbi...
Article
Geographical parthenogenesis, range expansion of apomictic plants after climatic changes, has been described for northern hemisphere gametophytic apomicts. But similar trends have been observed for sporophytic apomicts of Cerrado, the savannas in Brazil. Eriotheca pubescens is a common Cerrado tree, an agamic complex of either hexaploid/polyembryon...
Article
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Flower color has been studied in different ecological levels of organization, from individuals to communities. However, it is unclear how color is structured at the intrafloral level. In bee-pollinated flowers, the unidirectional gradient in color purity and pollen mimicry are two common processes to explain intrafloral color patterns. Considering...
Article
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Interactions between species are influenced by different ecological mechanisms, such as morphological matching, phenological overlap and species abundances. How these mechanisms explain interaction frequencies across environmental gradients remains poorly understood. Consequently, we also know little about the mechanisms that drive the geographical...
Article
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Nectar production in flowers has been associated with pollination systems and seen as part of plant reproductive strategies. But other factors may have a role on nectar features and its efficacy as reward. We investigated pollination system of Qualea grandiflora, the most widespread woody species of Cerrado, the Neotropical savannas in Central Braz...
Article
Background and aims: Pollen tube growth rate (PTGR) is an important single-cell performance trait that may evolve rapidly under haploid selection. Angiosperms have experienced repeated cycles of polyploidy (whole genome duplication) and polyploidy has cell-level phenotypic consequences arising from increased bulk DNA amount and numbers of genes an...
Article
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Resumo A heterostilia é um polimorfismo floral geneticamente controlado onde populações de plantas apresentam dois ou três morfos com peças reprodutivas em alturas recíprocas entre os morfos. Em populações naturais, espera-se encontrar uma razão igual entre os morfos (isopletia). O objetivo do estudo foi caracterizar o sistema reprodutivo, a biolog...
Article
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Forest fragmentation may affect mating and pollen dispersal patterns through conversion of continuous forests into small, spatially isolated remnant patches and individual trees in an anthropogenic landscape. We investigated reproductive investment and success, pollen dispersal, mating system, and genetic diversity and spatial structure of Qualea g...
Article
Rewardless orchid species are pollinated by deception and have reduced reproductive success. Those species that present self‐compatibility followed by alternative mechanisms of autogamy may compensate for such episodic allogamy events. This is the case for rain‐assisted self‐pollination, a rare mechanism in Orchidaceae. In this study, we investigat...
Article
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The relationship between plants and frugivorous animals is modulated by morphological and nutritional characteristics of fruits, as well as their seasonal availability across habitats. We evaluated fruiting phenology, fruit morphology and nutritional characteristics of 35 abundant plant species from 15 families associated with frugivorous birds fro...
Article
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In diploid late-acting self-incompatible (LSI) species of Bignoniaceae, self-pollinated pistils show a marked delay in ovule penetration by pollen tubes, followed by delayed, but otherwise normal, initial stages of endosperm development and subsequent pistil abscission. Most polyploid species of Bignoniaceae are apomictic and set selfed fruits with...
Book
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O Programa de Pós-Graduação em Ecologia e Conservação de Recursos Naturais da Universidade Federal de Uberlândia (PPGECRN-UFU) é um dos mais conceituados do país. Para formar ecólogos qualificados, o PPGECRN-UFU oferece anualmente o Curso de Campo. A edição de 2018 foi realizada no período de 19 de novembro a 03 de dezembro na Estação Ecológica de...
Article
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Background and Aims Large clades of angiosperms are often characterized by diverse interactions with pol-linators, but how these pollination systems are structured phylogenetically and biogeographically is still uncertain for most families. Apocynaceae is a clade of >5300 species with a worldwide distribution. A database representing >10 % of speci...
Article
Breeding systems have been associated with polyploidization and genomic change, which have a central role in the diversification of Angiosperms. Polyploidy commonly leads to isolated populations and species, and sometimes to apomixis, as observed for some woody plants of Cerrado, the Neotropical savannas in Central Brazil. Eriotheca gracilipes and...
Preprint
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Stomata are morphological structures of plants that have been receiving constant attention. These pores are responsible for the interaction between the internal plant system and the environment, working on different processes such as photosynthesis process and transpiration stream. As evaluated before, understanding the pore mechanism play a key ro...
Article
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The cultivation of species in urban areas for landscaping or consumption has increased in cities surrounded by Cerrado, putting in risk the local flora. Thus, the objective of this paper was to describe seed germination and seedling emergence of five urban cultivated species of Melastomataceae and Bombacoideae and compare them with Cerrado native s...
Article
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Pollination research in Brazil virtually started with Fritz Muller, whose insights supported Darwin’s evolutionary theory. Pollination systems of Brazilian plants were studied mainly by travelling researchers until early last century when native or resident geneticists began to use floral biology information to deal with crop acclimatization and br...
Article
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Some tropical Bignoniaceae form sporophytic apomictic polyploid complexes are similar to better studied temperate plants. Handroanthus ochraceus is a widely distributed Neotropical savanna tree with both monoembryonic/self-sterile, and polyembryonic/apomictic and self-fertile populations, but lacking chromosome number and morphological comparative...
Article
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Territoriality is a behavior related to the spatial defense of resources, and it is common in hummingbirds, which have great energetic needs. Among bird pollinated plant species , Palicourea rigida stands out since it is common and abundant in the Cerrado, with a generally patchy distribution. The objectives of this study were to record the humming...
Article
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Aim: We examined the effects of space, climate, phylogeny and species traits on module composition in a cross-biomes plant–hummingbird network. Location: Brazil, except Amazonian region. Methods: We compiled 31 local binary plant–hummingbird networks, combining them into one cross-biomes metanetwork. We conducted a modularity analysis and tested th...
Article
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1.Recent insights show that tropical forests are shifting in species composition, possibly due to changing environmental conditions. However, we still poorly understand the forest response to different environmental change drivers, which limits our ability to predict the future of tropical forests. Although some studies have evaluated drought effec...
Article
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Monomorphic enantiostylous species produce flowers with a displacement of the style to the left (L) or right (R) on the same individual, and they may exhibit different dynamics for the production of these floral types, which may influence levels of selfing. We investigated the production dynamics of L and R floral types in seven monomorphic enantio...
Article
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Understanding the relationships between Coffea arabica L. and the native tree community of secondary forests regrowing after the abandonment of coffee plantations is important because, as a non-native species in the Neotropics, coffee can outcompete native species, reducing diversity and forests ecosystem services. We aimed to answer three question...
Data
Density, basal area (cm2), frequency and successional group (P = pioneer; NP = Non-pioneer; Ex = exotic; and NA = Not available) of all species sampled in the tree and sapling component of secondary forest patches (BGJF-1 = shaded area 1, MPP = shaded area 2, and BGJF-2 = unshaded area) regrowing after the abandonment of coffee plantations (>70 yea...
Data
Coffee density, coffee basal area (cm2), native species density, native basal area (cm2), native species richness, Rarefied species richness (S’), Shannon diversity index (H’) and percentage of pioneer individuals (P) per plot of tree component (TC) and sapling component (SC) in three study areas (BGJF-1 = shaded area 1; MPP = shaded area 2; and BG...
Article
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Apomixis, the asexual formation of seeds, seems to be a reproductive alternative for many angiosperms, involving various pathways with different genetic and ecological consequences. It is common in some megadiverse tropical groups such as Melastomataceae, of which approximately 70% of the species studied so far in the tribe Miconieae are autonomous...
Article
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Floral monosymmetry appears to be a derived condition, arising independently many times, with a multiplicity of forms, and related to both, pollinator and plant diversification. It reduces interference between sexual functions in flowers and increases cross-pollination and allogamy. But since the description and assessment of the functioning of tho...
Article
• Since tropical trees often have long generation times and relatively small reproductive populations, breeding systems and genetic variation are important for population viability and have consequences for conservation. Miconia albicans is an obligate, diplosporous, apomictic species widespread in the Brazilian Cerrado, the savanna areas in centra...
Article
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Floral nectaries are linked with animal pollinators and floral specialization, characterizing some plant groups, such as the mostly Neotropical Vochysiaceae. The phylogeny of these plants has been revised based on molecular data, but their conspicuous spurs were mostly neglected. The appendicular or receptacular origin of these spurs has been discu...
Article
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Aim: Among the world’s three major nectar-feeding bird taxa, hummingbirds are the most phenotypically specialized for nectarivory, followed by sunbirds, while the honeyeaters are the least phenotypically specialized taxa. We tested whether this phenotypic specialization gradient is also found in the interaction patterns with their floral resources....