51 Works

Landmark Classification for Navigation In Indoor Environments

Marcio Schmidt, Luciene Delazari, Amanda Antunes, Caroline Marchis & Rhaissa Sarot

Off-Route Virtual Landmarks to Help Pedestrian Indoor Navigation

Marcio Schmidt, Luciene Delazari, Elias Naim & Vinícius Martins

Ralos poéticos na geografia museal

Vinícius Abrhm & Daniela Carvalho

Data from: Genetic structure and diversity of populations of polyploid Tibouchina pulchra Cogn. (Melastomataceae) under different environmental conditions in extremes of an elevational gradient

Vinícius L. G. Brito, Gustavo M. Mori, Bianca B. Z. Vigna, Marianne Azevedo-Silva, Anete P. Souza & Marlies Sazima
The genetic structure and diversity of plants may change significantly in an elevational gradient because different elevations regulate different ecological conditions. Several factors may influence genetic variation, such as mutations, selection, genetic drift, and gene flow. The aim of the present study was to evaluate the genetic structure and diversity of populations of Tibouchina pulchra Cogn. (Melastomataceae) trees in two extremes of an elevational gradient experiencing different environmental conditions. Nine polymorphic microsatellite loci were used...

Data from: Revisiting the pyrodiversity-biodiversity hypothesis: long-term fire regimes and the structure of ant communities in Neotropical savannas

Jonas Maravalhas & Heraldo L. Vasconcelos
1. The idea that variable fire regimes (pyrodiversity) may increase habitat heterogeneity and, consequently, increase biodiversity at the landscape level is a relatively old one. However, this idea has been recently challenged by studies showing that the biota of fire-prone ecosystems is so resilient to fire that variation in fire regime has little ecological consequences. 2. We evaluated how communities of ants – a dominant faunal group – differ with variation in the frequency and...

Dataset for: Short flowers for long tongues: functional specialization in a nocturnal pollination network of an asclepiad in long-tongued hawkmoths (Biotropica)

Felipe W. Amorim, Salvador Marino, Priscila Andre Sanz-Veiga, Jeff Ollerton & Paulo E. Oliveira
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 had never been described. We detailed here the intricate pollination mechanism of the South American asclepiad Schubertia grandiflora, where functional specialization on long-tongued hawkmoth pollinators occurs despite...

Plant species-specificity of ant-plant mutualistic interactions: Differential predation of termites by Camponotus crassus on five species of extrafloral nectaried plants

Eduardo Calixto, Denise Lange, Xoaquín Moreira & Kleber Del-Claro
There is increasing evidence that the outcomes of mutualistic interactions between ants and plants bearing extrafloral nectaries (EFNs) is context-dependent. In particular, the total number, density and size of EFNs, as well as the abundance and identity of ants attending host plants, are considered as key factors determining the nature and strength of ant-EFN-bearing plant interaction. Although many previous studies have investigated context-dependency in ant–plant protection mutualisms mediated by EFNs, few have tested whether the...

Data from: Pain intensity recognition rates via biopotential feature patterns with support vector machines

Sascha Gruss, Steffen Walter, Harald C. Traue, Philipp Werner & Adriano Andrade
Background: The clinically used methods of pain diagnosis do not allow for objective and robust measurement, and physicians must rely on the patient’s report on the pain sensation. Verbal scales, visual analog scales (VAS) or numeric rating scales (NRS) count among the most common tools, which are restricted to patients with normal mental abilities. There also exist instruments for pain assessment in people with verbal and / or cognitive impairments and instruments for pain assessment...

Data from: Asymmetric dispersal and colonization success of Amazonian plant-ants queens

Emilio M. Bruna, Thiago J. Izzo, Brian D. Inouye, Maria Uriarte & Heraldo L. Vasconcelos
Background: The dispersal ability of queens is central to understanding ant life-history evolution, and plays a fundamental role in ant population and community dynamics, the maintenance of genetic diversity, and the spread of invasive ants. In tropical ecosystems, species from over 40 genera of ants establish colonies in the stems, hollow thorns, or leaf pouches of specialized plants. However, little is known about the relative dispersal ability of queens competing for access to the same...

Data from: Relationship among medical student resilience, educational environment and quality of life

Patricia Tempski, Itamar S. Santos, Fernanda B. Mayer, Sylvia C. Enns, Bruno Perotta, Helena B. M. S. Paro, Silmar Gannam, Munique Peleias, Vera Lucia Garcia, Sergio Baldassin, Katia B. Guimaraes, Nilson R. Silva, Emirene M. T. Navarro Da Cruz, Luis F. Tofoli, Paulo S. P. Silveira & Milton A. Martins
Context: Resilience is a capacity to face and overcome adversities, with personal transformation and growth. In medical education, it is critical to understand the determinants of a positive, developmental reaction in the face of stressful, emotionally demanding situations. We studied the association among resilience, quality of life (QoL) and educational environment perceptions in medical students. Methods: We evaluated data from a random sample of 1,350 medical students from 22 Brazilian medical schools. Information from participants...

Data from: Climate mediates the effects of disturbance on ant assemblage structure

Heloise Gibb, Nathan J. Sanders, Robert R. Dunn, Simon Watson, Manoli Photakis, Silvia Abril, Alan N. Andersen, Elena Angulo, Inge Armbrecht, Xavier Arnan, Fabricio B. Baccaro, Tom R. Bishop, Raphael Boulay, Cristina Castracani, Israel Del Toro, Thibaut Delsinne, Mireia Diaz, David A. Donoso, Martha L. Enríquez, Tom M. Fayle, Donald H. Feener, Matthew C. Fitzpatrick, Crisanto Gómez, Donato A. Grasso, Sarah Groc … & C. Gomez
Many studies have focused on the impacts of climate change on biological assemblages, yet little is known about how climate interacts with other major anthropogenic influences on biodiversity, such as habitat disturbance. Using a unique global database of 1128 local ant assemblages, we examined whether climate mediates the effects of habitat disturbance on assemblage structure at a global scale. Species richness and evenness were associated positively with temperature, and negatively with disturbance. However, the interaction...

Data from: Functional richness shows spatial scale dependency in Pheidole ant assemblages from Neotropical savannas

Karen Neves, Mario Moura, Jonas Maravalhas, Renata Pacheco, Marcio Pie, Ted Schultz & Heraldo Vasconcelos
There is a growing recognition that spatial scale is important for understanding ecological processes shaping community membership, but empirical evidence on this topic is still scarce. Ecological processes such as environmental filtering can decrease functional differences among species and promote functional clustering of species assemblages, whereas interspecific competition can do the opposite. These different ecological processes are expected to take place at different spatial scales, with competition being more likely at finer scales and environmental...

Heterospecific shorebird flocks increase safety and reduce intraspecific competition

Cesar Cestari, Cristina Gonçalves & Celine Melo
Shorebirds join cohesive flocks for safety. The joining of individuals of several species in large heterospecific flocks can optimise individual vigilance and foraging. However, a large number of conspecific individuals in flocks may deplete food resources and increase intraspecific competition. In the present study, we argue that Nearctic-Neotropical migratory shorebird species join large heterospecific flocks in a balanced number as a way of controlling intraspecific competition. We recorded monospecific and heterospecific flocks in urban beaches...

Ecological mechanisms explaining interactions within plant-hummingbird networks: morphological matching increases towards lower latitudes

Jesper Sonne, Jeferson Vizentin-Bugoni, Pietro K. Maruyama, Andréa C. Araújo, Edgar Chávez-González, Aline G. Coelho, Peter A. Cotton, Oscar H. Marín-Gómez, Carlos Lara, Liliana R. Lasprilla, Caio G. Machado, Maria A. Maglianesi, Tiago S. Malucelli, Ana M. Martín-González, Genilda M. Oliveira, Paulo E. Oliveira, Raul Ortiz-Pulido, Márcia A. Rocca, Licléia C. Rodrigues, Ivan Sazima, Benno I. Simmons, Boris Tinoco, Isabela G. Varassin, Marcelo F. Vasconcelos, Bob O’Hara … & Bo Dalsgaard
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 patterns in network structure, such as complementary specialization and modularity. Here, we use data on morphologies, phenologies and abundances to explain interaction frequencies between hummingbirds and plants at a large geographic scale. For...

Integrating nocturnal and diurnal interactions in a Neotropical pollination network

Camila Souza, Paulo Oliveira, Bianca Rosa & Pietro Maruyama
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 interactions have been relatively overlooked. Using a multilayer network approach and considering diurnal and nocturnal interactions, we aimed to understand how interactions at different periods of the day are integrated...

Net benefits of a mutualism: influence of the quality of extrafloral nectar on the colony fitness of a mutualistic ant

Eduardo Calixto, Denise Lange & Kleber Del-Claro
Aim: Extrafloral nectar, a carbohydrate-rich liquid, is the main plant-based resource offered in exchange for ant protection. The positive results of this protection provided by ants are widely studied and supported; however, studies showing the benefits that ants and their colonies have from the resources offered by plants such as extrafloral nectar are scarce. Here, we evaluated how extrafloral nectar and artificial food resources with different nutrient concentration benefit short- and long-term Camponotus crassus colony...

Spatiotemporal niche-based mechanisms support a stable coexistence of ants and spiders in an extrafloral nectary-bearing plant community

Denise Lange, Eduardo Calixto, Kleber Del-Claro & Vanessa Stefani
Mechanisms promoting stable coexistence allow multiple species to persist in the same trophic level of a given network of species interactions. One of the most common stabilizing mechanisms of coexistence is niche differentiation, such as temporal and spatial patchiness. To understand the limits of coexistence between species we have to understand the limits of competitive interactions which translate in species exclusion or patterns of non-co-occurrence. We evaluated spatiotemporal niche-based mechanisms that could promote stable coexistence...

“BIG MOTHER” e as possibilidades da biotecnologia estampadas na bioarte

Luíza Franco & Daniela Carvalho
Esse texto traz provocações acerca das interfaces entre a Biologia e a Arte em produções artísticas nas quais a manipulação da vida é evidenciada por meio de células, sangue, bactérias e borboletas. A partir dessas produções, questionamos se é possível perceber o feminino na bioarte. Optamos por construir uma narrativa a partir da obra “Big Mother” de Patricia Piccinini abordando sua biografia, a relação com a ciência e as especificidades dessas áreas que são evocadas...

Data from: Conservative species drive biomass productivity in tropical dry forests

Jamir A. Prado Junior, Ivan Schiavini, Vagner S. Vale, Carolina S. Arantes, Masha T. Van Der Sande, Madelon Lohbeck, Lourens Poorter & Jamir A. Prado-Junior
1. Forests account for a substantial part of the terrestrial biomass storage and productivity. To better understand forest productivity we need to disentangle the processes underlying net biomass change. 2. We tested how above-ground net biomass change and its underlying biomass dynamics (biomass recruitment, growth, and mortality) can be explained by four alterative and contested hypotheses; the soil fertility, biomass ratio, niche complementarity and vegetation quantity hypotheses. 3. Above-ground biomass dynamics were evaluated over a...

Data from: Habitat filtering determines the functional niche occupancy of plant communities worldwide

Yuanzhi Li, Bill Shipley, Jodi N. Price, Vinícius De L. Dantas, Riin Tamme, Mark Westoby, Andrew Siefert, Brandon S. Schamp, Marko J. Spasojevic, Vincent Jung, Daniel C. Laughlin, Sarah J. Richardson, Yoann Le Bagousse-Pinguet, Christian Schöb, Antonio Gazol, Honor C. Prentice, Nicolas Gross, Jacob Overton, Marcus V. Cianciaruso, Frédérique Louault, Chiho Kamiyama, Tohru Nakashizuka, Kouki Hikosaka, Takehiro Sasaki, Masatoshi Katabuchi … & Marco A. Batalha
How the patterns of niche occupancy vary from species-poor to species-rich communities is a fundamental question in ecology that has a central bearing on the processes that drive patterns of biodiversity. As species richness increases, habitat filtering should constrain the expansion of total niche volume, while limiting similarity should restrict the degree of niche overlap between species. Here, by explicitly incorporating intraspecific trait variability, we investigate the relationship between functional niche occupancy and species richness...

Data from: Shifting species and functional diversity due to abrupt changes in water availability in tropical dry forests

Diego Raymundo, Jamir Prado-Junior, Fabrício Alvim Carvalho, Vagner Santiago Do Vale, Paulo E. Oliveira, Masha T. Van Der Sande & Masha T. Sande
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 effects on tree communities, we know little about the influence of increased water availability. Here, we evaluated how an increase in water availability caused by an artificial reservoir...

Data from: Temporal variation in the abundance and richness of foliage-dwelling ants mediated by extrafloral nectar

Ceres Belchior, Sebastián F. Sendoya & Kleber Del-Claro
Plants bearing extrafloral nectaries (EFNs) are common in the Brazilian cerrado savanna, where climatic conditions having marked seasonality influence arboreal ant fauna organization. These ant-plant interactions have rarely been studied at community level. Here, we tested whether: 1) EFN-bearing plants are more visited by ants than EFN-lacking plants; 2) ant visitation is higher in the rainy season than in dry season; 3) plants producing young leaves are more visited than those lacking young leaves in...

Dancing drives evolution of sexual size dimorphism in manakins

Elsie H. Shogren, Marina Anciães, Julia Barske, César Cestari, Emily H. DuVal, Milene G. Gaiotti, Erik I. Johnson, Rebecca T. Kimball, Miguel A. Marini, T. Brandt Ryder, Micah N. Scholer, Judit Ungvári, Stewart A. White & W. Alice Boyle
Body size mediates life history, physiology, and inter- and intra-specific interactions. Within species, sexes frequently differ in size, reflecting divergent selective pressures and/or constraints. Both sexual selection and differences in environmentally-mediated reproductive constraints can drive sexual size dimorphism, but empirically testing causes of dimorphism is challenging. Manakins (Pipridae), a family of Neotropical birds comprising ~50 species, exhibit both male- and female-biased size dimorphism and are distributed across gradients of precipitation and elevation. Males perform courtship...

Data and code for \"Biomechanical properties of a buzz-pollinated flower\"

Vinícius Brito, Carlos Nunes, Caíque Resende, Fernando Montealegre-Zapata & Mario Vallejo-Marín
Approximately half of all bee species use vibrations to remove pollen from plants with diverse floral morphologies. In many buzz-pollinated flowers, these mechanical vibrations generated by bees are transmitted through floral tissues, principally pollen-containing anthers, causing pollen to be ejected from small openings (pores or slits) at the tip of the stamen. Despite the importance of substrate-borne vibrations for both bees and plants, few studies to date have characterised the transmission properties of floral vibrations....

Data from: Biogeography of curimatid fishes reveals multiple lowland-upland river transitions and differential diversification in the Neotropics (Teleostei, Curimatidae)

Bruno F. Melo, James S. Albert, Fernando C. P. Dagosta & Victor A. Tagliacollo
The Neotropics harbors a megadiverse ichthyofauna comprising over 6300 species with approximately 80% in just three taxonomic orders within the clade Characiphysi. This highly diverse group has evolved in tropical South America over tens to hundreds of millions of years influenced mostly by re‐arrangements of river drainages in lowland and upland systems. In this study, we investigate patterns of spatial diversification in Neotropical freshwater fishes in the family Curimatidae, a species‐rich clade of the order...

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