Taline Cristina da Silva

The current status of ethnobiological research in Latin America: gaps and perspectives

BackgroundRecent reviews have demonstrated an increase in the number of papers on ethnobiology in Latin America. Among factors that have influenced this increase are the biological and cultural diversity of these countries and the general scientific situation in some countries. This study aims to assess the panorama of ethnobiological research in Latin America by analyzing its evolution, trends, and future prospects.MethodsTo conduct this study, we searched for papers in the Scopus (http://www.scopus.com) and Web of Science (http://www.isiknowledge.com) databases. The search was performed using combinations of keywords and the name of each Latin American country. The following countries were included in this study: Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Ecuador, Guatemala, Haiti, Honduras, Mexico, Panama, Paraguay, Peru, Venezuela, and Uruguay.Results and conclusionsAccording to our inclusion criteria, 679 ethnobiological studies conducted in Latin America were found for the period between 1963 and 2012. Of these studies, 289 (41%) were conducted in Brazil, 153 in Mexico (22%), 61 in Peru (9%), 58 in Argentina (8%), 45 in Bolivia (6%), and 97 (14%) in other Latin American countries. The increased number of publications related to this area of knowledge in recent years demonstrates the remarkable growth of ethnobiology as a science. Ethnobiological research may be stimulated by an increase in the number of scientific events and journals for study dissemination and by the creation of undergraduate courses and graduate programs to train ethnoscientists who will produce high-quality studies, especially in certain countries.

Pressure Indicators of Wood Resource Use in an Atlantic Forest Area, Northeastern Brazil

Wood resources are often used to support the needs of the local population. In order to protect biodiversity and resources, conservation strategies need to consider what types of wood use have the strongest impacts on forested areas. This study aimed to identify the use categories that put higher pressure on an Atlantic forest region located in the municipality of Igarassu in Pernambuco, northeastern Brazil. To conduct the study, we measured the volume of all wood products in 62 surveyed residences and registered the average replacement time for such products. The fuelwood category was most important locally and accounted for 92% of annual wood consumption. However, the construction category harvests more destructively and concentrates on the consumption of a few wood species. Therefore we recommend the fuelwood category to be the main focus of conservation effforts. In addition, the most important species for construction purposes (e.g., Eschweilera ovata (Cambess.) Miers, Apuleia leiocarpa (Vogel) J.F. Macbr. and Pogonophora schomburgkiana Miers ex Benth) should also be considered as a priority for conservation.

Socio-economic predictors of domestic wood use in an Atlantic forest area (north-east Brazil): a tool for directing conservation efforts

Given the excessive use pressure on forests, characterisation of the major users of forest resources can help guide conservation efforts. This study examines whether socio-economic variables explain domestic wood use in an area of Atlantic forest in the community of Tres Ladeiras (Pernambuco, north-east Brazil). Socio-economic data were collected from 62 households, and geometric measurements of wood products in each household were taken to calculate the wood volume. An informant in each household indicated the average replacement time for each type of wood use. Data were analysed for static volume (wood volume found at the time of the visit) and dynamic volume (rate of wood consumption, calculated as the ratio between volume and replacement time). Multiple regression analyses were performed to determine the relationships between wood volume (static and dynamic) and the number of species used; independent variables including monthly family income, number of residents, average age of heads of the household...Given the excessive use pressure on forests, characterisation of the major users of forest resources can help guide conservation efforts. This study examines whether socio-economic variables explain domestic wood use in an area of Atlantic forest in the community of Três Ladeiras (Pernambuco, north-east Brazil). Socio-economic data were collected from 62 households, and geometric measurements of wood products in each household were taken to calculate the wood volume. An informant in each household indicated the average replacement time for each type of wood use. Data were analysed for static volume (wood volume found at the time of the visit) and dynamic volume (rate of wood consumption, calculated as the ratio between volume and replacement time). Multiple regression analyses were performed to determine the relationships between wood volume (static and dynamic) and the number of species used; independent variables including monthly family income, number of residents, average age of heads of the household, age of oldest household member, average residence time of heads of the household, average education level of heads of the household and education level of the most educated household member. Monthly income was inversely related to the static wood volume (adjusted R 2 = 17.6%, p < 0.001), rate of wood consumption (adjusted R 2 = 23.0%, p < 0.001) and number of species used (adjusted R 2 = 22.3%, p < 0.001) and was the most important predictive variable for these three outcomes. Other factors such as average education level and average age of heads of the household were also explanatory variables of the total rate of wood consumption, as these two variables, together with monthly family income, explain 31.3% of the total dynamic volume. Given the high importance of income in our study, we suggest that future conservation strategies give special attention to the poorest members of the community.

Why do people use exotic plants in their local medical systems? A systematic review based on Brazilian local communities

Efforts have been made to understand the processes that lead to the introduction of exotic species into local pharmacopoeias. Among those efforts, the diversification hypothesis predicts that exotic plants are introduced in local medical systems to amplify the repertoire of knowledge related to the treatment of diseases, filling blanks that were not occupied by native species. Based on such hypothesis, this study aimed to contribute to this discussion using the context of local Brazilian populations. We performed a systematic review of Brazilian studies up to 2011 involving medicinal plants, excluding those studies that presented a high risk of bias (because of sampling or plant identification problems). An analysis of similarities (ANOSIM) was conducted in different scales to test for differences in the repertoire of therapeutic indications treated using native and exotic species. We have found that although there is some overlap between native and exotic plants regarding their therapeutic indications and the body systems (BSs) that they treat, there are clear gaps present, that is, there are therapeutic indications and BSs treated that are exclusive to exotic species. This scenario enables the postulation of two alternative unfoldings of the diversification hypothesis, namely, (1) exotic species are initially introduced to fill gaps and undergo subsequent expansion of their use for medical purposes already addressed using native species and (2) exotic species are initially introduced to address problems already addressed using native species to diversify the repertoire of medicinal plants and to increase the resilience of medical systems. The reasons why exotic species may have a competitive advantage over the native ones, the implications of the introduction of exotic species for the resilience of medical systems, and the contexts in which autochthonous plants can gain strength to remain in pharmacopoeias are also discussed.

Folk classification as evidence of transformed landscapes and adaptative strategies: a case study in the semiarid region of northeastern Brazil

Abstract How do people classify the living world? Solid theoretical and methodological foundations advocate for utilitarian or intellectual strategies. Some authors argue that people tend to classify natural resources that are necessary for their survival. However, in the case of landscapes, we do not know the true criteria that people use to classify their space. We present strong evidence that people name landscapes according to utilitarian (economic) criteria. We also seek to identify which factors and variables explain people’s knowledge about landscapes and how this knowledge can generate information about landscape modifications. This study was conducted in the Brazilian National Forest of Araripe (FLONA Araripe), NE Brazil, with local people who live near this forest. A total of 304 nomenclatural types of landscapes were recounted, and these landscapes were mainly associated with indicators of current or past use. The variables that best explained the knowledge about landscapes were useful species known and the number of categories of use, showing that utilitarian features are strongly associated with local forest classification. Our findings suggest an adaptive strategy in which people name the landscape based on past and current uses, either as a whole or with respect to particular features of certain areas. In addition, we interpret this finding as a mnemonic strategy for optimising the use of the landscape.

What Factors Guide the Selection of Medicinal Plants in a Local Pharmacopoeia? A Case Study in a Rural Community from a Historically Transformed Atlantic Forest Landscape

The criteria that local people use for selecting medicinal plants have been a recurrent topic in pharmacology and ethnobotany. Two of the current hypotheses regarding this phenomenon, ecological apparency and diversification, attempt to explain the inclusion of “apparent” and “non-apparent” and native and exotic taxa, respectively, in local pharmacopoeia. This study addresses the following questions: Do “apparent” and “non-apparent” medicinal plants have the same importance in local pharmacopoeia? Do “non-apparent” plants occupy more local categories of diseases than “apparent” plants? Do native and exotic medicinal plants have the same importance? Do exotic and native plants occupy different local categories of diseases? This study was conducted with householders of a community from Northeastern Brazil. Out of the 66 plant species cited, most were herbs (39 species), followed by trees and shrubs (27). Herbaceous species also occupied more local categories of diseases (51) than tree and shrub species (28). Furthermore, most of the species cited by the informants were exotic (42). Out of the 94 therapeutic applications cited in this research, 65 were treated with exotic species and 29 with native species, distributed among 13 body systems. These results support both the hypotheses of ecological apparency and diversification.

Human impact on the abundance of useful species in a protected area of the Brazilian Cerrado by people perception and biological data

Abstract Studies about relationships between people and landscapes have shown that local communities can affect the abundance of plant species useful to humans, which raises the question of how landscape management processes might modify the abundance of useful plant species in a forested area. We addressed this issue based on people perception and biological evidence. This study was undertaken in the Araripe National Forest, a protected area of sustainable use of natural resources in Brazil. Our results showed that the studied landscape experienced modifications in abundance of species caused by management processes. For instance, phytosociological data for the managed areas showed a greater abundance of the more salient useful species compared with useful species that have lower local importance. The comparison of historical and current aerial images of the landscape indicated that plant density had increased in forested managed areas where agricultural practices were stopped. Despite this, local perceptions indicated that the abundance of most of the useful plant species in the managed areas had decreased over time.

Biota Perception and Use

Perceptual processes are complex and are addressed by several disciplines. These processes are responsible for the ways that humans access the external world. Therefore, they influence the ways in which human beings appropriate environmental resources. Some studies have indicated that differences in intra- and intercultural perception, such as age, individual social role, and religion, may influence perceptions about nature. Thus, how certain factors affect human perception of nature, its use, and environmental resource appropriation will be discussed in this chapter.

Biological and Evolutionary Bases of Human Perception of the Natural Environment

Perception is the gateway of the human species to the outside world. However, the concept of human perception may vary in accordance with the perspectives of different authors. For ethnobiology, investigation of the factors that influence perception is important to facilitate our understanding of the attitudes of human beings in their interactions with the environment. Thus, this chapter will focus on the biological and evolutionary bases that can explain the multiple perceptions of our species in terms of different environments and certain natural resources. The perception of organoleptic properties and the perception of landscapes will be used as examples in this discussion. Studies show that the perception of organoleptic properties by human groups is important in the recognition of food and medicinal plants, and perceptions of landscapes are fundamental to human survival in different environments.

What Is Environmental Perception

Over time, human groups have established cognitive, perceptual, and behavioral ties to the natural environment. Accessing perception is a challenge, as it involves having to address physiological, psychological, and cultural aspects that are involved in how one accesses the world outside. In this chapter, we introduce some conceptual issues on this theme and propose the adoption of the term environmental representation in reference to perception studies within ethnobiology.