- Open Access
Perceptions of environmental change and use of traditional knowledge to plan riparian forest restoration with relocated communities in Alcântara, Eastern Amazon
© Celentano et al.; licensee BioMed Central Ltd. 2014
- Received: 22 October 2013
- Accepted: 20 December 2013
- Published: 27 January 2014
Riparian forests provide ecosystem services that are essential for human well-being. The Pepital River is the main water supply for Alcântara (Brazil) and its forests are disappearing. This is affecting water volume and distribution in the region. Promoting forest restoration is imperative. In deprived regions, restoration success depends on the integration of ecology, livelihoods and traditional knowledge (TEK). In this study, an interdisciplinary research framework is proposed to design riparian forest restoration strategies based on ecological data, TEK and social needs.
This study takes place in a region presenting a complex history of human relocation and land tenure. Local populations from seven villages were surveyed to document livelihood (including ‘free-listing’ of agricultural crops and homegarden tree species). Additionally, their perceptions toward environmental changes were explored through semi-structured interviews (n = 79). Ethnobotanical information on forest species and their uses were assessed by local-specialists (n = 19). Remnants of conserved forests were surveyed to access ecological information on tree species (three plots of 1,000 m2). Results included descriptive statistics, frequency and Smith’s index of salience of the free-list results.
The local population depends primarily on slash-and-burn subsistence agriculture to meet their needs. Interviewees showed a strong empirical knowledge about the environmental problems of the river, and of their causes, consequences and potential solutions. Twenty-four tree species (dbh > 10 cm) were found at the reference sites. Tree density averaged 510 individuals per hectare (stdv = 91.6); and 12 species were considered the most abundant (density > 10ind/ha). There was a strong consensus among plant-specialists about the most important trees. The species lists from reference sites and plant-specialists presented an important convergence.
Slash-and-burn agriculture is the main source of livelihood but also the main driver of forest degradation. Effective restoration approaches must transform problems into solutions by empowering local people. Successional agroforestry combining annual crops and trees may be a suitable transitional phase for restoration. The model must be designed collectively and include species of ecological, cultural, and socioeconomic value. In deprived communities of the Amazon, forest restoration must be a process that combines environmental and social gains.
As matas ciliares fornecem serviços ecossistêmicos essenciais ao bem-estar humano. O Rio Pepital é a principal fonte de água de Alcântara (Brasil) e suas matas estão desaparecendo, afetando o volume e a distribuição de água na região. Promover a restauração da mata ciliar do Rio Pepital é crucial. Em regiões carentes, o sucesso da restauração depende da integração da ecologia, dos meios de vida e dos conhecimentos tradicionais. Neste trabalho se propõe uma abordagem interdisciplinar para desenhar estratégias de restauração com base em dados ecológicos, conhecimento tradicional e as necessidades sociais. A área de estudo tem uma complexa história de realocação humana e de posse da terra. Populações de sete comunidades que usam ou usaram o Rio Pepital foram entrevistadas para documentar sua subsistência e percepções sobre as mudanças ambientais (n = 79). Informações etnobotânicas sobre espécies florestais nativas e seus usos foram avaliados com especialistas-locais (n = 19). Remanescentes de florestas conservadas foram avaliados para levantar informações ecológicas das espécies arbóreas (três parcelas de 1.000 m2). Os entrevistados mostraram um forte conhecimento empírico sobre os problemas ambientais do rio, suas causas, conseqüências e possíveis soluções. Foi encontrado um total de 24 espécies arbóreas (DAP > 10 cm) nas áreas de referência. A densidade de árvores média foi de 510 indivíduos por hectare (stdv = 91,6), sendo12 espécies consideradas as mais abundantes (densidade > 10ind/ha). Houve um alto consenso entre os especialistas locais sobre as espécies mais importantes da mata. As listas de espécies das áreas de referência e dos especialistas-locais apresentaram uma convergência importante. A agricultura de corte e queima é o principal meio de subsistência na bacia do Pepital e também a principal causa da degradação da mata ciliar. Para ter sucesso, a restauração deve transformar problemas em soluções, empoderando a população local. Dessa forma, os sistemas agroflorestais sucessionais combinando culturas anuais e árvores podem representar uma alternativa transitória para a restauração. O modelo deve ser construído coletivamente e incluir espécies de valores ecológicos, culturais e sócio-econômicos. Em comunidades carentes da Amazônia, a restauração florestal deve ser um processo que combina ganhos ambientais e sociais.
- Reference Site
- Riparian Forest
- Riparian Area
- Traditional Ecological Knowledge
- Forest Restoration
In the tropics, riparian forests are essential for human well-being. They provide ecosystem services such as water regulation, erosion control, forest products, fishery maintenance, biodiversity conservation, and leisure . Despite being protected by law , these forests are widely threatened in Brazil by deforestation and competing anthropogenic activities, to such an extent that restoration efforts are urgently needed .
Ecological restoration is defined as “the process of assisting the recovery of an ecosystem that has been degraded, damaged or destroyed” . It is an intentional activity that initiates or accelerates the recovery of an ecosystem with respect to its integrity, functionality and sustainability. According to Higgs , scientific and technological acumen is insufficient for restoration; it is necessary to respect other types of knowledge besides science, and especially to recognize the ethics and values that are beyond the scope of science. Participation of local communities in the planning and implementation of restoration efforts is essential [6, 7]. Indeed, forest restoration success depends on the integration of ecology, livelihoods, and traditional knowledge . Local people must be directly involved in the process of resource conservation, management and restoration.
Alcântara is a municipality in the Eastern Brazilian Amazon, on the northern Atlantic coast. In the early 80s, the Brazilian Space Agency started the construction of the Alcântara Launch Center (CLA) near the coast due to its advantageous geographical position for satellite launches . For this reason, after two year of resistance, 312 families from 23 coastal communities were relocated from their traditional territories to inland agrovillages (rural villages planned and built by the government) . The planning of human relocations did not fully consider social and environmental aspects. Communities that had fisheries as their main livelihood were placed far from the beach and were subjected to seashore access restrictions . Moreover, many agrovillages were placed in the headwaters of the Pepital watershed.
The Pepital River is the main water supply for Alcântara. It is also very important for rural communities’ livelihood and recreation. Part of the relocated population used to live by the riverside close to the delta. The riparian forests of the Pepital River, especially in headwaters and main springs are highly degraded. The water level diminution in recent years has led to the commencement of water rationing in Alcântara. It is imperative to promote the restoration of the Pepital riparian forest. Part of the local community is aware of the problem and requested support from the Academia, which inspired the present proposal.
The rationale for this study is that an interdisciplinary research study based on ecological data, traditional ecological knowledge (TEK) and social needs is a suitable framework to design participative restoration efforts that combine ecological and social gains. To that end, relocated populations that use the Pepital River were surveyed to document their livelihoods, and to explore their perceptions toward environmental changes. Persons with remarkable knowledge of the local ecology were identified and consulted about plant species and forest restoration strategies. Finally, plots in conserved forests were surveyed to gain ecological information about species composition and abundance in non-degraded areas.
The study was conducted in seven villages (Agrovila Pepital, Maruda, Rio Grande, Cajueiro, Só Assim, Espera and Ponta Seca) that had received persons relocated from the Pepital River delta and vicinity in the early 80s (Figure 1). The distance of these villages to the Pepital headwaters varies from 0 to 7 km. Most relocated people used to live along the coast, close to the flooded forest and mangroves, where food resources from the forest, mangrove, river and beach were widely available . They were displaced to areas close to the river headwaters and were given lands to cultivate (15 ha). According to Caldarelli , families from different communities were mixed upon relocation, thus breaking up longstanding neighborly and cultural relations. Access to their ancient lands was forbidden by the Alcantara Launch Center (CLA), which is controlled by the Brazilian Air Force because these areas are considered strategic for national security.
Data collection and analyses
The research was undertaken between October 2012 and June 2013. A community meeting was held in the Agrovila Pepital to inform residents about the aims and methods of the study, and to ask for their participation in the research. Residents of the other villages surveyed were invited and transportation was made available.
Qualitative methods were used to assess information about livelihoods and local perception of river degradation, well-being and restoration needs. Semi-structured interviews were conducted with 79 households (23% of the village families). Interviews were always preceded by a presentation of the project and the team. The sampling was randomized. The first house of the village was visited and every fourth thereafter. When a house was empty it was replaced by the previous house; and if that one was also empty it was replaced with the next house in the village. Interviewed persons were preferentially old enough to remember the life and environmental conditions before the relocation process (age averaged 57 years old, with a standard deviation of 14.5). For this reason, eight questionnaires did not suit the criteria and were invalidated.
Interviews were conducted on a one-on-one basis and their duration varied between 40 minutes to 2 hours. Interviews consisted of asking relocated residents about four main subjects: A) their history, family, housing conditions, and perception of well-being; B) their livelihood and income (families that depended on agriculture and/or had agroforestry home gardens were asked to freely list the plant species they used); C) their present and past relation with the river (uses and benefits) and their perception about the situation of the river, its causes and consequences for human health; and D) their perception about forest restoration needs and potential approaches. These subjects were presented to the respondents through a standardized questionnaire that was filled out manually. The responses were carefully checked and grouped into categories defined afterwards for descriptive statistics such as percentages and frequencies.
Ethnobotanical information on native forest species and their use was assessed with 19 local specialists. These local specialists were identified among the respondents as the individuals that considered themselves and/or were considered by the community to be specialists in forest species . With them the free-listing technique  was used by which they freely listed the tree species they knew to occur in the Pepital River riparian forest.
The free-list method is an efficient tool to indicate which species belong in the cultural domain . Smith’s index is a measure of salience that ranges from 0 to 1 and is based on the highest frequency values and greater coincidence in the position of citation between informants, thereby promoting ordering of items in the list, which allows the identification of possible ‘breaks’ in the dataset . A cultural consensus analysis of the data obtained from the free-list was performed to measure the degree of agreement among informants (“culturally correct” information) . The frequency and Smith’s index of salience of the free-list results (agricultural crops, home garden trees species, wild fauna and tree species of the Pepital River) were calculated by ANTHROPAC 4.9 [15, 18], and correlated at > 0.97. This high correlation between item frequency and Smith’s salience indicates consistency in the free-list results . Only the species with Smith’s index higher than 0.1 were reported.
Field observations and ecological surveys provided complementary information. For the ecological survey, three plots of 1,000 m2 (50 × 20 m) were established in the most conserved riparian forests of the Pepital River to evaluate the relative richness and abundance of trees species (more than 10 individual per hectare). The location of the plots was set after a field trip carried out alongside the river led by two local specialists. Plots were at least 1 km apart from each other to guarantee sampling independence. In each plot, all trees >10 cm diameter at breast height (DBH) were sampled. The common names were given by the local specialists and samples were brought to the Maranhao State University (UEMA) herbarium to undergo botanical identification.
All informants belonged to the relocated community. The majority of them were female (58%); their age averaged 57 years (stdv = 14.5); and 63% had less than 3 years of formal education (most likely illiterate).
Perception of well-being and livelihood in the agrovillages
In their traditional lands, families used to live in adobe houses without electricity, water supply or a sewer system. They were far from educational and health services, while public transportation was not available. In contrast, they had free access to abundant natural resources. In the agrovillages, relocated families received a brick house with electrical energy and water supply from a communal artesian well. They still do not have a sewer system or proper waste management (garbage is burned in 95% of homes). However, each agrovillage has a primary school and a medical clinic attended by a physician on a monthly basis. Roundtrip transportation is available daily to downtown Alcântara. Each family also received 15 ha for agriculture, but land tenure in these areas is insecure. Communities did not receive the property rights to these lands because the Alcantara Launch Center plans to expand in the future .
The majority of interviewees (65%) consider themselves to have a good quality of life, associating it with good infrastructure and security. For 26% of interviewed households, life quality is average. They claim that infrastructure, especially transportation is not sufficient (37%), or they complain that everything has to be purchased because of the distance to the river, forest and/or coast (63%). For 9% of the respondents, the quality of life in the agrovillage is poor and they are unanimous in the reason: everything has to be purchased due to the distance to the river, forest and/or coast.
According to historical documentation of the relocation process, agrovillages’ residents never reconciled with what had been done in their villages in relation to the management of natural resources . There was an exchange route between villages that stopped after relocation because there was no longer surplus of production or fish; they became dependent upon money to purchase supplies . There was a profound change in the surrounding environment, traditions and livelihoods of the relocated communities.
It is essential to identify the livelihood of a community before planning a restoration strategy, especially in regions where people suffer serious deprivation. Indeed, natural resource scarcity is often correlated with poverty and an unsustainable livelihood . Most of the respondents depend on slash-and-burn agriculture (85.7%) to meet their livelihood needs. Only 15.7% of the householders depend directly upon the Alcantara Launch Center (CLA) and associated institutions for their familial income. Most of them formerly practiced slash-and-burn agriculture before relocation, but 17.1% fished as their main source of livelihood.
Free list of agricultural plants species preferred by local population along the Pepital River in Alcântara, Brazil (n = 57)
Portuguese common name
Pseudo-Reliability = 0.976
Free list of agroforestry homegarden plant species preferred by local population of the Pepital River in Alcântara, Brazil (n = 58)
Pseudo-Reliability = 0.992
Even though most interviewees have an agricultural field and/or agroforestry homegarden, the majority of the respondents (88.6%) depend on complementary income from the federal government, such as a familial allowance for those who have children in school (45.7%), retirement pension (57.1%) or both (14.3%). This government subsidy represents the main source of net cash for the families.
Perception of environmental change in the Pepital River
Free list of native fauna found in the past according to local population of the Pepital River in Alcântara, Brazil (n = 39)
Portuguese common name
Pseudo-Reliability = 0.976
Degradation of Pepital River riparian forest
Forest degradation has different definitions . This study considers riparian forest degradation the result of anthropogenic activity that decreases ecosystem productivity, biomass and biodiversity, and that is characterized by a reduction of tree density [25, 26]. Deforestation and forest degradation in the Brazilian Amazon is a widespread problem  with a variety of negative impacts on environmental services  and human well-being . The Pepital River riparian areas are a mosaic of lands in use for slash-and-burn agriculture, fallow with different ages of abandonment, and forests. The forest is constantly threatened by illegal activities (see next section) and the fallows (including species-rich young secondary forest) are constantly converted to slash-and-burn fields. According to Brazilian law, riparian forest must be preserved (or restored) and any other soil use is illegal .
Local people know that the Pepital River is disappearing and they have clear understanding that deforestation and forest degradation are the main causes. They also recognized that their livelihood (slash-and-burn subsistence agriculture) is the major driver of forest loss. Slash-and-burn agriculture (or shifting cultivation) is the dominant small-scale form of cultivation in the tropics . In this system, farmers depend on the input of forest biomass ashes to fertilize their crops. Generally, the cycle is initiated by the logging of valuable timber while using other wood for charcoal production. Then, the impoverished forest area is burned and converted to an agricultural field. It is used for one or two production cycles and subsequently abandoned. After some years, the regenerated fallow is burned again. In Alcântara, as in many other areas of the tropics , the population increase leads to more pressure on the land and subsequent reduction of the fallow often below the natural soil fertility recovery time. The direct consequence is a reduction of yields and increased pressure on the land .
The slash-and-burn method provokes several negative environmental impacts, most notably air pollution and related respiratory diseases, uncontrolled fires, GES emissions, and loss of soil fertility when fallowing does not allow for proper soil restoration . This method is especially harmful in riparian areas where it causes a severe depletion of ecosystem services such as water infiltration, erosion protection, biodiversity conservation, and carbon stock .
The use of riparian areas to cultivate under this regime is common because alluvial soils present the best fertility and moisture conditions [31, 32], especially in the dry season between July and December. Even though Brazilian forest law forbids riparian forest conversion to agricultural uses, it is widespread on both small and large proprieties in the Amazon .
Moreover, the lack of security in land tenure of the relocated populations may also contribute to riparian forest deforestation. Land tenure issues are important factors driving environmental destruction in the Brazilian Amazon . As mentioned before, each relocated family received 15 ha for cultivation but no title documenting property rights. Their utilization license can be repealed at any time in the future since Alcantara Launch Center plans to expand . The “ownership” of Pepital River riparian areas is not clear. Some interviewees mentioned that such areas are the property of the Brazilian Air Force, whereas others stated that when the land was “given” by the government, they were asked to “respect” the riparian forest; however, 15 interviewees stated that they received land along the riverside to cultivate. Also, it was mentioned that the non-occupied riparian areas (areas not in agricultural use) are constantly “invaded” for extraction of resources or for establishment of new plots of slash-and-burn fields (facts evidenced in the field; see next section), which implies that some areas are treated as free-access without any external control. Some interviewees reported receiving areas inadequate for cultivation due to distance from their community (mean time to access their plots: 36.5 ± 31.2 minutes walking) and/or soil condition. Therefore, they occupied the riparian areas. In the words of an interviewee: “We know that cutting this forest is wrong, but when we need to feed our family we don’t think about it”. This statement justifies why they deforest and may help to guide restoration approaches that consider their livelihood needs.
Non-degraded riparian forest: data from conserved areas and traditional ecological knowledge (TEK)
Determining reference conditions is a fundamental component for planning ecological restoration . Overall, restoration planning begins with the selection of reference sites where comprehensive field sampling establishes attributes of the diversity and structure of native vegetation . However, in disturbed landscapes TEK can make important contributions towards determining the composition and management of historical species .
Most abundant trees species (DBH > 10 cm) that occur in the most conserved riparian forests of the Pepital River at Alcântara, Brazil (n = 3 plots of 0.1 ha)
Density (ind/hectare) mean ± stdv
Virola surinamensis (Rol.) Warb.
97.3 ± 97.1
M, T, O
Xylopia brasiliensis Sprengel
63.3 ± 60.3
Carapa guianesenis Aubl.
46.7 ± 50.3
M, T, O
Symphonia globulifera Linn. f.
43.4 ± 40.4
Mauritia flexuosa L.F.
33.3 ± 32.1
Euterpe oleraceae Mart.
33.3 ± 43.6
Richeria dressleri G.L. Webster
30.0 ± 43.6
26.7 ± 46.2
20.0 ± 34.6
Attalea maripa (Aubl.) Mart
16.7 ± 15.3
F, H, O
Tapirira guianensis Aubl.
16.7 ± 15.3
13.3 ± 5.8
Free list of the main trees species of the Pepital riparian forest according to local plant specialists in Alcântara, Brazil (n = 19)
Symphonia globulifera Linn. f.
Virola surinamensis (Rol.) Warb.
M, T, O
Euterpe oleraceae Mart.
Mauritia flexuosa L.F.
Humiria balsamifera (Aubl) St. Hill
Xylopia brasiliensis Sprengel
Carapa guianesenis Aubl.
M, T, O
Pseudo-Reliability = 0.970
Most of the identified tree species have a direct human use as food or medicinal resource (Table 4). Moreover, four species (pindaíba, pau-pombo, urucurana and mirim) were mentioned as bearing fruits attractive to birds and other animals, which gives them a desirable characteristic for restoration projects. Mirim, urucurana, jussara and guanandi were mentioned several times as “water protectors”, i.e. trees that preserve water in the stream. Indeed, they were always located in flooded forest.
Planning riparian forest restoration with the community
Restoration of degraded riparian areas is required by Brazilian law . Restoration in human-modified landscapes must transform problems into solutions, involving and empowering local people. A proposed holistic concept of restoration was termed “Forest Landscape Restoration” (FLR), which is defined as the process that aims to restore ecological integrity and enhance human well-being in deforested or degraded forest landscapes . This approach theoretically considers the dynamic and complex interactions between people, natural resources and land use on a landscape scale. It is crucial that it be considered in the Pepital River watershed, where slash-and-burn subsistence agriculture is the main livelihood (86% of families) and the major driver of riparian forest degradation. The local population is deprived and does not have many alternatives (or wishes) for drastically changing their way of life. However, they may be interested in designing a restoration program that considers their livelihood needs and restores their linkage with the river.
Planting trees is the main strategy to overcome tropical forest deforestation . Interestingly, it is also common sense among more than half of interviewees (56%) as a strategy to restore the Pepital riparian forest. Restoration must consider ecological, social, and cultural aspects in its design. Traditional ecological knowledge (TEK) must be incorporated into restoration practices to account for cultural diversity and sustainable human participation in the ecosystem . Moreover, people’s motivation and commitment to restoration projects is frequently related to species usefulness and desired environmental goods and services [41, 42]. It is especially important in poor communities where livelihood drives environmental degradation as in the Pepital watershed.
Vieira et al.  proposed an agro-successional restoration approach, which they defined as incorporating a range of agroecology and agroforestry techniques as a transitional phase early in the forest restoration process. In this system, crops are planted at the same time as native tree species. Considering the livelihood needs of communities of the Pepital River and the local environmental conditions, the proposed approach may represent a viable way to incorporate species of ecological and cultural value as well as to consider livelihood needs, thus overcoming socioeconomic and ecological obstacles. A recently adopted Brazilian law now permits the use of agroforestry systems as a transitional restoration stage in riparian areas . This approach permits landholders to use their livelihoods as a way to mitigate the damage and restore the landscape. As presented in the previous section, besides agriculture, homegardens are also important to householder food-security strategy (79%), as a means of providing fruits.
Brazilian law forbids logging in riparian forests, even of planted trees. However, riparian forests can be managed for fruits, other non-timber forest products (NTFP) and annual crops (in the transitional phase). During interviews, local community listed the preferred crop species that interviewees grow in their fields (Table 1) and the tree species that they use in their agroforestry gardens, especially for fruits (Table 2). These lists will serve to illustrate and give foundation to participatory processes for choosing the species that are adapted to the specific conditions. During the initial restoration period, which might range from 3 to 20 years depending on the system , crops will be harvested, planted trees must be managed, and other forest species will regenerate naturally. As the canopy closes, agricultural crops will decline until they are removed. At this point, fruit trees will be producing and native forest species regenerating.
The use of non-native plant species in restoration has been criticized severely by some authors but acclaimed by others . Considering the situation of the Pepital River, incorporating non-invasive useful exotic species into the restoration design might not be an ecological danger and may promote the engagement of the local community in the restoration process while diminishing the pressure upon conserved forests. The decision about which species to plant, as well as the specified planting design, may be built collectively in participatory workshops. However, it is strongly recommended that an interdisciplinary team – composed of agronomists, soil scientists, hydrologists, anthropologists, ecologists and other professionals – participate in the restoration efforts along with the local community. Potentially invasive species shall not be introduced in the system and the management of crop species must be based on agroecological and organic techniques, since chemical fertilizers, pesticides and other agrochemicals may contaminate the watercourse. The restoration plan may pre-define the elimination of exotic species at some point of the process.
The proposed restoration approach may be complemented by additional techniques, such as passive restoration  and enrichment plantings of less abundant and rare native species , for which a complementary botanical survey would be necessary. Moreover, critical areas (such as water sources and bluffs) may be restored for ecological purposes only (sensu stricto restoration). It is essential to monitor restoration throughout the process according to an adaptive management appraisal  by learning from the system outcomes and continually improving the practices to achieve ecological and social goals. Complementary actions (such as courses and workshops) to increase environmental awareness as well as to empower the local people in agroforestry, agroecology and restoration may be promoted. The presented restoration proposal, as any participatory approach, may or may not be accepted and/or adopted by the local community. If adopted, this system may increase the resilience of social-ecological systems. This approach may be suitable in other regions where poverty and livelihood drive environmental degradation. The research must be participatory and its results must always be validated and agreed upon by the community.
In the present study an interdisciplinary research framework is proposed to design riparian forest restoration strategies based on ecological data, TEK and social needs. Firstly, the livelihood of the communities and preferred plant species (crops and agroforest trees) were documented; the past and present importance of the Pepital River for the communities and their perceptions of environmental change and causes for ecological damage were identified. Conserved forests were surveyed as reference sites and local specialists interviewed about the diversity of tree species.
Local populations showed a strong empirical knowledge of not only the environment problems of the Pepital River, but also of their causes, consequences and potential solutions. Although slash-and-burn agriculture is the main livelihood of this population, it is also the main driver of the Pepital River riparian forest degradation. An effective restoration approach must transform problems into solutions by involving and empowering local people. Successional agroforestry that mixes crops and trees may be a suitable transitional phase toward restoration. The model must be designed collectively and include species of ecological, cultural and socioeconomic value. In deprived communities of the Eastern Amazon, forest restoration must be a process that combines environmental and social gains.
This project and publication was financed by State of Maranhão Research Foundation (FAPEMA). We are indebted to the people in the agrovilas in Alcantara who participated in this study by sharing their experience and knowledge. We are thankful for the assistance of Ernesto Gomez Cardozo, Willianne Silva, Jéssica Almeida, Fernanda Oliveira, and Patrycia Amorim with social data collection and Liliane Ribeiro with the vegetation survey. Marilda Mascarenhas provided us with logistical support. Fabricio Brito provided the map of the study area. Kate Proctor is acknowledged for commenting on the manuscript and James Welsh for the grammatical editing. VLE and EGM acknowledge CNPq (Brazil’s National Research Council) for granting a Research Productivity Fellowship.
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