Julio Louzada

Julio Louzada
Universidade Federal de Lavras (UFLA) | UFLA · Departamento de Biologia

About

196
Publications
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Introduction
I´m Julio Louzada, a tropical ecologist working in the last decades with dung beetles from Brazilian ecosystems. My work aims to discover the impacts of anthropogenic actions over the biodiversity and their ecological functions/services. At the moment my research group has projects ongoing in Amazon, Atlantic Forest, and Brazilian savannah.

Publications

Publications (196)
Article
Full-text available
The Riverine Barrier Hypothesis (RBH) predicts that tropical rivers can be effective barriers to species dispersion, affecting different scales of biological organization, from genes to assemblages. We disentangled the latitudinal from the river presence effect to test the hypothesis that the Doce river mouth acted as a geographical, historical bar...
Article
Full-text available
Canthon virens (Mannerheim, 1829) (Coleoptera: Scarabaeidae: Scarabaeinae) prey on leaf-cutting ants, using their body for provisioning larvae, as part of the reproductive behavior. Here, we report an observation of a new behavior of C. virens during the predation of Atta laevigata (Smith, 1858) (Hymenoptera: Formicidae) in Southeastern Brazil. We...
Article
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Human activities pose a major threat to tropical forest biodiversity and ecosystem services. Although the impacts of deforestation are well studied, multiple land-use and land-cover transitions (LULCTs) occur in tropical landscapes, and we do not know how LULCTs differ in their rates or impacts on key ecosystem components. Here, we quantified the i...
Article
The indiscriminate use of Ivermectin is becoming a frequent scenario in Brazil, one of the largest beef cattle herds in the world, and the second‐highest commercial production, despite this product having harmful effects on non‐target organisms. Among these organisms, dung beetles are essential for the maintenance of ecosystem functioning in introd...
Article
Dung beetles (Coleoptera: Scarabaeidae) provide essential ecological functions in the ecosystems they inhabit, acting in nutrient cycling, parasite control and, seed secondary dispersal. In addition, they are widely used as indicators of environmental changes. Here, we evaluated the dung beetle assemblages’ diversity and structure in the natural gr...
Article
Full-text available
Introduction The Brazilian Atlantic Forest (BAF) is undergoing alarming deforestation, land overexploitation, and unregulated occupation. The Coastal Sandy Vegetation of BAF, known as Restinga, is under the most pressure of the BAF ecosystems. Understanding the effects of Restinga deforestation on biodiversity is a conservation priority. Aims/Meth...
Article
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The diversity of endotherms and ectotherms may be differently affected by ambient temperature and net primary productivity (NPP). Additionally, little is known about how these drivers affect the diversity of guilds of different trophic levels. We assessed the relative role of temperature and NPP in multitrophic guilds of ectothermic (arthropods: an...
Article
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en Tropical forest biodiversity is being threatened by human activities, and species losses during forest disturbance can compromise important ecosystem functions and services. We assessed how species losses due to tropical forest disturbance affect community functional structure, using Amazonian dung beetles as a model group. We collected empirica...
Article
Consider both water and land When designing terrestrial reserves, it is common to consider the needs of species and systems from a terrestrial perspective, with an assumption that any freshwater systems will benefit as well. Leal et al. tested this assumption by analyzing data from two locations in the Brazilian Amazon and found that it is far from...
Article
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Grazing by large herbivorous mammals is still a structuring force in tropical grassy ecosystems, and cattle grazing is one of the main economic activities carried out in these ecosystems in modern times. Therefore, understanding the impacts of cattle grazing removal on biodiversity may be a key step for conservation of this ecosystem. Here, we stud...
Article
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Our knowledge of how tropical forest biodiversity and functioning respond to anthropogenic and climate-associated stressors is limited. Research exploring El Niño impacts are scarce or based on single post-disturbance assessments, and few studies assess forests previously affected by anthropogenic disturbance. Focusing on dung beetles and associate...
Article
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Tropical forests and coral reefs host a disproportionately large share of global biodiversity and provide ecosystem functions and services used by millions of people. Yet, ongoing climate change is leading to an increase in frequency and magnitude of extreme climatic events in the tropics, which, in combination with other local human disturbances,...
Article
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When aiming to assess the effects of elevation on animal diversity, many studies have been carried out in different vegetation types occurring across elevational gradients. Thus, it remains unclear if any changes observed in species richness are caused by factors directly associated with elevation or are caused by vegetation change across the gradi...
Article
Replacing native savannas with exotic pastures not only alters vegetation structure, but it also increases her-bivorous cattle dung quantity consequently changing the food resource available for dung beetles. Therefore, this study aims at investigating the relative importance of vegetation structure regarding food resource types to determine dung b...
Article
Theoretically, a pair of species might coexist if they converge to an optimal phenotype and are not able of excluding each other, even under niche overlap conditions. We empirically evaluated this hypothesis analyzing the niche overlap for two coexisting dung beetles species in Brazilian coastal sand dune forest. The species exhibit a high degree o...
Article
1. Dung beetles perform relevant ecological functions in pastures, such as dung removal and parasite control. Livestock farming is the main economic activity in the Brazilian Pantanal. However, the impact of cattle grazing on the Pantanal's native dung beetle community, and functions performed by them, is still unknown. 2. This study evaluated the...
Article
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Functional diversity is commonly used to assess the conservation value of ecosystems, but we have not yetestablished whether functional and taxonomic approaches are interchangeable or complementary to evaluatecommunity dynamics over time and in response to disturbances. We used afive-year dataset of dung beetlesfrom undisturbed forest, primary fore...
Article
Novel and hybrid ecosystems present different conservation values for native species. Therefore, the classification of modified ecosystems into a novel or hybrid state is an essential step to assist conservation strategies for biodiversity. During the last decades, plantations of Eucalyptus have increased in the highly threatened Atlantic Forest re...
Article
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Dung beetles (Coleoptera: Scarabaeinae) mediate many ecological functions that are important to maintain the ecosystem functioning of terrestrial environments. Although a large amount of literature explores the dung beetle-mediated ecological processes, little is known about the individual contribution from distinct species. Here, we aimed to exami...
Article
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Secondary forests (SFs) regenerating on previously deforested land account for large, expanding areas of tropical forest cover. Given that tropical forests rank among Earth's most important reservoirs of carbon and biodiversity, SFs play an increasingly pivotal role in the carbon cycle and as potential habitat for forest biota. Nevertheless, their...
Article
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Various organisms emit malodorous secretions against competitors, and the potential use of these secretions in pest management should be investigated. For example, some ant species feed on similar resources as dung beetles, which might have led to counter chemical defences in dung beetles. We tested whether pygidial secretions of the dung beetle Ca...
Article
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As one of Earth's most carbon-dense regions, tropical forests are central to climate change mitigation eorts. Their unparalleled species richness also makes them vital for safeguarding biodiversity. However, because research has not been conducted at management-relevant scales and has often not accounted for forest disturbance, the biodiversity imp...
Article
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Flies are the main competitors of dung beetles for oviposition sites and rolling dung beetles relocate their food to reduce interspecific competition. Furthermore, dung beetles deposit chemical substances on the food ball that may repel fly larvae and certain predators. In the present study, using Deltochilum furcatum, a dung beetle that does not e...
Article
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Aim Thousands of kilometres of rainforest edges are created every year through forest fragmentation, but we have little knowledge of the impacts of edges on spatial patterns of species turnover and nestedness components of β‐diversity. Location A quasi‐experimental landscape in the north‐east Brazilian Amazon. Methods We sampled dung beetles and...
Preprint
Full-text available
Potential negative effects of the synthetic veterinary pharmaceutical, Ivermectin, on non-target fauna have generated a search for less-toxic alternatives. Thus, Neem plant extract (Azadirachta indica A. Juss) has been used as a natural alternative to replace Ivermectin worldwide. However, little is known about the effects of this natural veterinar...
Preprint
Full-text available
Potential negative effects of the synthetic veterinary pharmaceutical, Ivermectin, on non-target fauna have generated a search for less-toxic alternatives. Thus, Neem plant extract ( Azadirachta indica A. Juss) has been used as a natural alternative to replace Ivermectin worldwide. However, little is known about the effects of this natural veterina...
Article
Full-text available
We evaluated the relative importance of dung type and intraspecific variation in biomass on dung beetle function by quantifying the ecological functions (dung removal and soil excavation) of two dung beetle species under laboratory conditions: Dichotomius bos, which preferentially feeds on herbivorous dung, and Chalcocopris hesperus, which is a gen...
Article
While a significant effort has been made to understand how human activities influence biodiversity, less attention has been given to the consequences of tropical forest disturbance on belowground functional processes and its linkages with environmental drivers. Here, we demonstrate how selective logging influenced dung beetle communities and two as...
Article
Full-text available
The Caatinga is an endemic and threatened dry-forest biome distributed across northern Brazil. We evaluated the conservation value of a Caatinga Natural Reserve (NR) - Floresta Nacional (FLONA) Contendas do Sincorá - using Scarabaeinae dung beetles as a biodiversity indicator. Specifically, we contrasted two zones impacted by two distinct intensity...
Article
Selective logging is the most widespread driver of tropical forest disturbance. As such, it is critically important to identify at which spatial scale logging intensity should be measured and whether there are clear thresholds in the relationship between logging intensity and its impacts on biodiversity or ecological processes. We address this usin...
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Primary seed dispersal of many rain-forest seeds occurs through defecation by mammals. Dung beetles are attracted to the defecations and through their dung-processing behaviour these insects change the initial pattern of seed deposition. Final seed deposition patterns, i.e. where and how seeds are deposited after dung beetle activity has taken plac...
Article
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The dung roller beetle Canthon smaragdulus (Scarabaeinae) has a pair of pygidial glands whose secretions have different functions. However, the factors influencing the production of pygidial secretions in these dung beetles are not known. This study is the first to evaluate differences in the amount of pygidial secretions produced by C. smaragdulus...
Article
There is increasing recognition that community assembly theory can offer valuable insights for ecological restoration. We studied community assembly processes following tropical forest restoration efforts, using dung beetles (Scarabaeidae) as a focal taxon to investigate taxonomic and functional patterns of biodiversity recovery. We evaluated the r...
Data
Estimated Species Richness Estimated richness of all land use and cover classes (LUCC) at equal average sample coverage (app. 77.6%) in the twelve variegated landscapes of Lavras —MG, Brazil.
Data
PERMANOVA and PERMDISP analysis Paired test values of PERMANOVA and PERMDISP analysis to assess, respectively, differences in species composition and data cloud multivariate dispersion among the land use and cover classes (forest fragments, forest corridors, coffee plantation and pasture), Lavras —Brazil. The mean values of multivariate dispersion...
Data
Sample coverage Sample coverage and observed richness of all land use and cover classes (LUCC) in the twelve variegated landscapes of Lavras —MG, Brazil.
Data
Contrast analysis Paired test values of contrast analysis to assess differences in species richness, abundance, and biomass of dung beetle among the land use and cover classes (forest fragments, forest corridors, coffee plantation and pasture), Lavras —Brazil. ∗ highlights significant results at p < 0.05.
Article
Full-text available
Background Conserving biodiversity in tropical landscapes is a major challenge to scientists and conservationists. Current rates of deforestation, fragmentation, and land use intensification are producing variegated landscapes with undetermined values for the conservation of biological communities and ecosystem functioning. Here, we investigate the...
Article
Biased and subjective choices in the variable selection processes used in ecological studies commonly lead researchers to reach misleading conclusions regarding patterns of biodiversity response to disturbances. Nevertheless, little attention has been given to these processes in the majority of studies published to date. Here, we assess the extent...
Article
Anthropogenic activities are causing species extinctions, raising concerns about the consequences of changing biological communities for ecosystem functioning. To address this, we investigated how dung beetle communities influence seed burial and seedling recruitment in the Brazilian Amazon. First, we conducted a burial and retrieval experiment usi...
Article
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The increased global demand for tropical timber has driven vast expanses of tropical forests to be selectively logged worldwide. While logging impacts on wildlife are predicted to change species distribution and abundance, the underlying physiological responses are poorly understood. Although there is a growing consensus that selective logging impa...
Article
The impacts of human activities on tropical forests are widespread and increasing. Hence, a good knowledge base about ecological processes in undisturbed tropical forest is crucial to provide a baseline for evaluating anthropogenic change. Our 5-year study focused on understanding the background spatial and inter-annual variation in dung beetle com...
Article
Full-text available
Concerted political attention has focused on reducing deforestation, and this remains the cornerstone of most biodiversity conservation strategies. However, maintaining forest cover may not reduce anthropogenic forest disturbances, which are rarely considered in conservation programmes. These disturbances occur both within forests, including select...
Book
Full-text available
Key messages • Soil is an important habitat for thousand millions of organisms. • Soil biodiversity is extremely diverse in shapes, colours, sizes and functions. • Soil biodiversity is globally distributed, from deserts to polar regions through grasslands, forests, urban and agricultural areas. • Soil biodiversity supports many services essential t...
Article
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Human alteration of the global environment is leading to a pervasive loss of biodiversity. Most studies evaluating human impacts on biodiversity occur after the disturbance has taken place using spatially distinct sites to determine the undisturbed reference condition. This approach is known as a space-for-time (SFT) substitution. However, SFT subs...
Article
Full-text available
Functional diversity indices are used to facilitate a mechanistic understanding of many theoretical and applied questions in current ecological research. The use of mean trait values in functional indices assumes that traits are robust, in that greater variability exists between than within species. While the assertion of robust traits has been exp...
Data
Dung beetle morphological trait measurements. (DOCX)
Data
Analyses carried out on pronotum volume and back leg length. (DOCX)
Data
Multidimensional scaling ordination plots of dung beetle communities and multivariate analysis of variance. (DOCX)
Data
Analysis of site on dung beetle body mass values. (DOCX)
Data
Excel file of data used in this paper. (XLSX)
Data
Associations between raw traits. (DOCX)
Article
Full-text available
Este é o primeiro estudo da diversidade de besouros rola-bosta (Coleoptera: Scarabaeidae: Scarabaeinae) nas savanas intra-amazônicas de Roraima, Brasil. Nosso objetivo foi inventariar a fauna de besouros associada com savanas (conhecidas regionalmente como 'lavrado'), uma vez que pouco se sabe sobre esses besouros nesse ambiente. Nós amostramos em...
Book
Full-text available
SPE EA Pôle BIOME The Atlas is divided in 8 chapters covering all the aspects of soil biodiversity: - Chapter I: The soil habitat - Chapter II: Diversity of soil organisms - Chapter III: Geographical and temporal distribution - Chapter IV: Ecosystem functions and services - Chapter V: Threats - Chapter VI: Interventions - Chapter VII: Policy, educa...