Jonas Maravalhas

Jonas Maravalhas
Universidade Federal de Uberlândia (UFU) | UFU · Institute of Biology (IB)

PhD

About

19
Publications
7,084
Reads
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290
Citations
Additional affiliations
February 2014 - present
Universidade Federal de Uberlândia (UFU)
Position
  • PhD Student
Description
  • Geographic patterns of ant diversity in the Cerrado, a savanna hotspot
February 2011 - March 2013
Universidade Federal de Uberlândia (UFU)
Position
  • Master's Student
Description
  • Long-term fire regimes and the structure of ant communities in the Cerrado
August 2005 - November 2010
University of Brasília
Position
  • Student
Description
  • Cerrado ant communities: tritrophic interactions and effects of fire regimes
Education
February 2014 - February 2018
February 2011 - March 2013
August 2005 - November 2010
University of Brasília
Field of study
  • Myrmecology

Publications

Publications (19)
Article
Full-text available
Fire-suppression is of concern in fire-prone ecosystems because it can result in the loss of endemic species. Suppressing fires also causes a build-up of flammable biomass, increasing the risk of severe fires. Using a Before-After, Control-Impacted design, we assessed the consequences of high-severity fires on Neotropical savanna arboreal ant commu...
Article
Physical disturbances, such as fire, may affect the relationship between ants and plants. We evaluated the extent to which severe fires alter the protective effect of ants against the herbivores of an extrafloral-nectary bearing tree. We performed an ant removal experiment and sampled the ant fauna from the same trees over 4 years: the pre-fire yea...
Article
Physical disturbances, such as fire, may affect the relationship between ants and plants. We evaluated the extent to which severe fires alter the protective effect of ants against the herbivores of an extrafloral-nectary bearing tree. We performed an ant removal experiment and sampled the ant fauna from the same trees over 4 years: the pre-fire yea...
Article
Full-text available
Although savannas are fire-adapted ecosystems, prescribing fire for biodiversity conservation remains controversial at least in some regions where savannas occur. Faced with uncertainty, many decision makers and even scientists are still reluctant to prescribe fire for conservation purposes in fire-prone ecosystems, invoking the precautionary princ...
Article
There is a growing recognition that spatial scale is important for understanding eco‐ logical 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, w...
Article
Full-text available
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, whe...
Article
Full-text available
1. Understanding what creates and maintains macroscale biodiversity gradients is a central focus of ecological and evolutionary research. Spatial patterns in diversity are driven by a hierarchy of factors operating at multiple scales. Historical and climatic factors drive large‐scale patterns of diversity by affecting the size of regional species p...
Article
Full-text available
The strength of plant-animal diversity relationships tends to be idiosyncratic and, in many cases, its mechanisms are poorly understood. Consequently, the relevance of plant diversity patterns as surrogates of animal diversity patterns is still debated. We evaluated if ants and trees show congruent patterns of species richness and turnover at a reg...
Article
Full-text available
Aim: To evaluate the extent to which ant species richness in Neotropical savannas varies with macrogeographic variables, and to identify the potential climatic drivers of such variation. Location: The Cerrado savanna biome of central Brazil, in a region spanning ca. 20° of latitude and 18°of longitude. Methods: Standardized sampling of the arboreal...
Article
Full-text available
To evaluate the extent to which ant species richness in Neotropical savannas varies with macrogeographic variables, and to identify the potential climatic drivers of such variation. The Cerrado savanna biome of central Brazil, in a region spanning ca. 20° of latitude and 18°of longitude. Standardized sampling of the arboreal and ground-dwelling fau...
Article
Full-text available
We conducted a meta-analysis of the effects of fire on the abundance and alpha diversity of ants based upon data published over the past 70 years. Overall, fire reduced ant diversity by 18 %, but had no effect on ant abundance. However, there was significant variation in the effect of fire on ant diversity amongst different vegetation types. Fire s...
Article
Full-text available
Background The fungus-farming ant genus Cyatta (Formicidae: Myrmicinae) is represented by a single species, C.abscondita Sosa-Calvo et al., known from a few localities in Brazil (in the states of Ceará, Minas Gerais, São Paulo and the Distrito Federal), and a single locality in the Misiones province, Argentina. Cyatta is known to occur predominantl...
Article
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 ec...
Article
Full-text available
a b s t r a c t Ecologists often seek sampling protocols that are both effective and relatively simple, i.e. those that provide a balance between the advantages obtained through sampling completeness and the costs involved in species sorting. Here we explored ways of simplifying a protocol devised for assessing geo-graphic patterns of ant species r...
Article
Full-text available
Ants dominate vegetation stratum, exploiting resources like extrafloral nectaries (EFNs) and insect honeydew. These interactions are frequent in Brazilian cerrado and are well known, but few studies compare ant fauna and explored resources between plant species. We surveyed two cerrado plants without EFNs, Roupala montana (found on preserved enviro...
Article
Full-text available
Associações entre formigas e Hemiptera são comuns em Membracidae, Coccoidea e Aphidoidea, porém poucos são os casos de formigas utilizando exsudado em espécies da família Cicadellidae. Acompanhamos indivíduos de Roupala montana Aubl. (Proteaceae) em área de cerrado no Distrito Federal (Brasil) durante a estação chuvosa de 2006 e 2007. Neste período...
Article
Full-text available
The Brazilian cerrado, the second largest bioma in this country, is now constituted only by fragments of vegetation that together correspond to less than 20% of its original vegetation. This study investigates the butterfly fauna found in fragments of cerrado sensu stricto and gallery forest of the University Campus Darcy Ribeiro. A list containing...

Questions

Questions (2)
Question
I am looking for a way to standardize the coefficients of determination (beta coefficient) of the explanatory variables in a negative binomial function. I tried the lm.beta function in QuantPsyc package of R, but the returned coefficients are too small (seems to be divided by 100, compared to usual glm). Also, standardizing the variables to Z-scores prior to modelling also returns low values for the coefficients. 
Does anyone know of a way to standardize these coefficients across different explanatory variables so I can select the variables that cause greater change in the response variable?
Thank you!
Question
I am looking for a map of plant diversity (vascular or overall), either globally or in the Neotropics. Preferably in any SIG format. Does anyone have any clue?Thanks!

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Projects

Project (1)
Project
The main objective of this study is to verify the patterns that work in structuring ant communities in the Cerrado through functional diversity and distribution of guilds.