Harvesting Bertholletia excelsa Bonpl. in a western Amazon rural community: local ecological knowledge and meaning to "nut-crackers".

INTRODUCTION: The collection of Bertholletia excelsa Bonpl. (castanha-da-Amazônia; Brazil nuts) seeds make up part of the everyday activities of the traditional populations that have inhabited all of the Amazon basin since remote times. Nonetheless, knowledge about these harvesting activities in native forest areas has not been well documented. The present study was designed to better understand the significance of this harvesting activity as well as the traditional ecological knowledge of the harvesters. METHODS: Utilizamos entrevistas semiestruturadas para a coleta de dados com extrativistas de castanha, moradores de Caroebe, Roraima (n = 18) durante o período de março de 2021 a março de 2022. The data analysis was based on the frequency of responses to socio-economic questions and their knowledge about that plant species as well as why those interviewees chose that line of work. We also adopted the Spearman and Mann-Whitney non-parametric tests to correlate variables identified in the study, and selected sections of their depositions to highlight the traditional knowledge of the interviewees and their experiences as harvesters. RESULTS: Constatamos que as razões para a escolha do trabalho com o extrativismo para todos os entrevistados é a necessidade de renda complementar, tradição familiar (55%), the sense of well-being provided by contact with the natural environment (25%), and a favorable disposition toward that type of work (11%). Harvesting involves collective work, and many of the interviewees had engaged in those efforts to help their families since their childhood or adolescence. The older harvesters cited more animal species that consumed the Brazil nuts (ρ = 0.60; p = 0.009) and perceived more and greater changes in the environment that were prejudicial to the Brazil nut trees (U = 9.50; p = 0.022). The interviewees who reported lower incomes cited more significant cultural changes and more suggestions concerning conservation activities. According to their statements, deforestation, and the burning and illegal cutting of native trees, including Brazil nut trees, have contributed to environmental change in the region and raised significant concerns about the future of harvesting activities. CONCLUSION: The activities of the "nut-crackers" represent to them more than just a simple source of income, as harvesting provides them with a connection to nature that promotes their well-being and cultural heritage. The nut harvesters have gained specific knowledge concerning both environmental and cultural changes. Those changes have mainly come about through the expansion of agricultural activities and the felling of native forests-which are the main threats to the future of Brazil nut extraction. Attributing value to the folk knowledge of those harvesters would strengthen the local economy, promote forest conservation, and help to better understand the impacts of anthropic activities on the forest and the harvesting of natural products.

Vegetation cover and seasonality as indicators for selection of forage resources by local agro-pastoralists in the Brazilian semiarid region.

Local knowledge and uses of forage resources are highly dynamic, and can be mediated by multiple factors, such as seasonality, floristic diversity and the morphophysiological characteristics of plants. We investigate how seasonality and vegetation cover mediate the use of forage resources. The study was carried out with agro-pastoralists from two areas of Brazilian semiarid region. To select the areas, we used the normalized difference vegetation index. We selected one area with low vegetation cover (Area I) and another with high vegetation cover (Area II). Respondents were selected using the snowball technique. Using semi-structured interviews, we collect the information about forage use in the dry and rainy seasons, preferences of ruminants and specific characteristics of plant species. A total of 57 informants were interviewed in the two areas. We used the Chi-square test to assess differences in the richness of species cited between areas, seasons (dry/rainy), origins (exotic/native) and strate (herbaceous/woody). Our results revealed that agro-pastoralists living in the area with the highest vegetation cover (Area II) cited a greater number of species. We found that the use and selection of species is guided by a series of functional characters, related to palatability and nutritional value, which change between seasons. These results highlight the vast knowledge of ecological characteristics of species and diet of ruminants acquired by agro-pastoralists during field experience, with seasonality defining the use of species. Different from what we expected, the richness of exotic species mentioned did not differ between areas. This diversity of information contributes to a better understanding of the use of forage resources and indicates the importance of including local experiences as strategies to ensure proper use and provide insights for the conservation of local resources.

What are the factors influencing the aversion of students towards reptiles?

BACKGROUND: Reptiles form a paraphyletic group with significant roles for human society, including species that are considered important for food, medicinal and mystical use and as pets. Some species are considered to be aversive, whereas others are captivating among people. Aversion is an important factor which should be considered in the conservation policies of these animals. As such, here, we investigate the demographic, educational, perceptives and behavioural factors of students related to their aversion and non-conservationist attitudes directed towards different reptile species and evaluated the effect of educational exhibition of animals as a strategy of mitigating these attitudes. METHODS: The data were obtained through forms on the aversion and conservation of reptiles represented by three species, a chelonian, a snake and a lizard. The form was given in two instances, before and after a visit to a private zoo (Museu Vivo Répteis da Caatinga), where the students had contact with the aforementioned species. A total of 133 students participated in the study, among these, 43 from elementary school (21 females and 22 males), 29 from high school (16 females and 13 males), 37 from university biology students (22 females and 15 males) and 24 university mathematics students (6 females and 18 males). RESULTS: Among all evaluated species, snakes were considered to be the most aversive species. The aversion attitudes differed between the three evaluated species when correlated to age and type of university courses. However, this pattern did not differ between student sexes. Older students had a lower aversion to the chelonian compared to the younger ones, but for snakes and lizards, the aversion was high among students of all ages. The university biology students had a lower aversion compared to the university mathematics students for the three species. The recognition and handle of the tested species and previous visits to educational exhibitions of animals were negatively related to aversion. The comparative analysis of the forms applied before and after the visit to the Museu Vivo Répteis da Caatinga showed that this visit influenced the decrease of aversion, but not in non-conservationist attitudes, for which the attitude scores had always been low. CONCLUSIONS: We conclude that reptile aversion varies in accordance with the taxon, being snakes the most disliked by students. The visit to the educational exhibition of animals contributed to the reduction of the observed aversion. This is especially true when the acquisition of educational information about species is associated with practical activities which includes contact with the animals. Finally, the fact that non-conservationist attitudes had been low towards all species perhaps demonstrates a conservationist tendency even for the most aversive species.

Fauna and conservation in the context of formal education: a study of urban and rural students in the semi-arid region of Brazil.

BACKGROUND: In addition to playing a key role in the dynamics of ecosystems, animal diversity, especially that of wild vertebrates, is intimately linked with human evolutionary history, which has resulted in diverse interactions that must be emphasized in formal education processes. We analyzed several methods of approaches used for biological education in order to teach about wild vertebrates and their conservation in urban and rural schools in the semi-arid region of Brazil. METHODS: Data were obtained via questionnaires applied to 990 students, of which 528 were urban and 462 rural, distributed among the seven grades/years that comprise the last two cycles of basic education in Brazil. The richness and diversity of the animals cited by the students were calculated, being the diversity using an adaptation of the equation for the Shannon-Weaver Index (H'). Data were analyzed using non-parametric descriptive statistics. RESULTS: Mammals and birds had the greatest richness and diversity of animals cited as most-studied in science/biology classes, and also the most indicated as occurring in the studied region. Among mammals, large carnivores with a showy appearance and utilitarian value had the highest citation frequencies, while there was a tendency for limited recognition of faunistic diversity in the other groups mentioned. Almost 70% of the students stated that their schooling processes dealt with the conservation of wild animals; however, about 50% of the students in both urban and rural contexts did not express conceptual understanding about the conservation of nature. CONCLUSIONS: The recognition of animal diversity, especially vertebrates, beyond just mammals and birds, as well as conceptual clarity about the conservation of nature, are fundamental factors for the development of critical awareness of fauna and its conservation, and where the processes of schooling have a preponderant role. Finally, the study contributes to the legitimization of Ethnobiology as an interdisciplinary field of knowledge, especially in its interface with education, in addition to pointing out the importance of optimizing efforts in approaches to biodiversity conservation in formal educational processes.

Illegal trade of songbirds: an analysis of the activity in an area of northeast Brazil.

BACKGROUND: This study aimed to analyze the chain and dynamics of the trade of wild birds between keepers and traders in an area of northeast Brazil. Profit from the purchase and sale of these animals in the trade chain was also estimated. METHODS: The information was obtained through interviews with direct participants in the wild bird trade chain. RESULTS: We recorded a total of 34 bird species involved in illegal trade. In general, the purchase and sale values of songbirds are associated with the attractiveness and songs of the birds. Regarding the commercial potential of the species, those with high numbers of traded individuals had higher average purchase values and, especially, sale values. Birds with lower purchase values showed higher sale profits and were sold in large numbers. The purchase and sale values of songbirds in the present study show a significant economic return for those involved in this activity. CONCLUSIONS: The results of this study may provide data to support future studies on the conservation of wild birds, assisting in monitoring illegal trade, a persistent problem in the region studied.

Environmental influence on the choice of medicinal animals: a case study from northeastern Brazil.

BACKGROUND: Animals from various taxonomic groups are commonly used in folk medicine, and their selection seems to be directly linked to their availability and accessibility. In the present study, we analyzed the use of animals as a source of folk medicines in a community in northeastern Brazil with access to aquatic and terrestrial animals. We hypothesize that the medicinal fauna is well represented by species of both habitat types. METHODS: For the collection of information, semi-structured questionnaires were applied to local residents. RESULTS: We recorded the use of 22 animals used as medicinal resources in the community, distributed among eight taxonomic categories, which are used to treat 38 types of diseases. Of the therapeutic animals, 14 species are terrestrial and 8 species can be considered aquatic occurring in marine or estuarine habitats. CONCLUSIONS: Our data confirm the tendency of human communities to use affordable medicinal animals in local ecosystems. We also found that medicinal use represents a strategy of optimizing the use of resources and is related to the economic, historical, social, cultural, and ecological contexts in which the community is inserted.

Wild vertebrates and their representation by urban/rural students in a region of northeast Brazil.

BACKGROUND: Recognition of the diversity of living beings, including the classification and naming of species, is a fundamental condition for biological literacy with the aim of developing critical awareness of human relationships with nature, and for which formal education plays an important role. The present study aimed to analyze the representation that urban/rural students have for wild vertebrates and their main sources of knowledge. METHODS: Data collection took place in three public schools, one urban and two rural, in the municipality of Campina Grande, Paraíba, Brazil. Questionnaires were given to 990 students (528 urban and 462 rural), distributed among all the grades that comprise middle school (Ensino Fundamental II, grades 6-9) and high school (Ensino Médio, grades 10-12) education. RESULTS: A total of 5877 citations were mentioned by the students, which corresponded to 224 distinct animals with 166 (72.0%) being wild vertebrates, 24 (25.7%) being domestic vertebrates, and 34 (2.3%) being invertebrates. Mammals and reptiles had the greatest observed richness of citations, while mammals (H' = 3.37), birds (H' = 2.84), and invertebrates (H' = 2.94) had the greatest diversity. Positive correlations were found between citations of wild vertebrates and family income (rt = 0.06; P < 0.05) and curricular development (rs = 0.08; P < 0.01); negative correlations were found between curricular development and citations of domestic animals (rs = - 0.22; rs = - 0.11 P < 0.01) and between age group and citations of invertebrates (r = - 0.14; rs = - 0.11 P < 0.01). As for the sources of knowledge regarding the animals indicated by the students, "media," "daily experiences," "tradition" (here understood as knowledge resulting from interactions with parents and experienced community members), and "formal education" stood out. CONCLUSIONS: Comprehension of vertebrate diversity is a fundamental condition for the development of attitudes compatible with its conservation, which emphasizes the importance of biological literacy in achieving this purpose.

Understanding the motivations for keeping wild birds in the semi-arid region of Brazil.

BACKGROUND: Birds are kept as pets around the world, and bird-keeping is an ancient and widespread practice, constituting one of the main reasons for the decline of some species. In the semi-arid region of Brazil, this practice is very common and continues despite being designated as illegal in recent decades. This study aimed to identify the species and families of songbirds used as pets in the semi-arid region of Brazil, characterize the maintenance of the exploited species in captivity, and evaluate the sociocultural context associated with this practice. METHODS: Data were collected from a total of 62 wild bird-keepers in the study area through interviews using semi-structured forms and informal conversations. RESULTS: A total of 34 bird species are bred as pets in the study area. Thraupidae was the most represented family in this study followed by Icteridae, and together, these families accounted for 61.7% of the local specimens. As reported by the respondents, birds are acquired by capturing them in rural areas or through local and regional markets. The number of species identified by the respondents did not differ according to respondent income, educational level, or age (p > 0.05). Maintaining these birds in cages includes some care, such as providing feed, medicine, and in some cases, training to improve their song or to learn songs from other species. The species with the highest use values (UVs) were Sporophila albogularis (UV = 0.83), Paroaria dominicana (0.82), and Sporophila nigricollis (0.79), indicating their importance as wild animal pets. CONCLUSION: The birds reported in this study have strong cultural importance and high economic value for the people involved in bird-keeping. In this sense, ethnoornithological studies are fundamentally important since they can provide basic information to inform plans and actions to promote the conservation and sustainable management of local avifauna, including the essential element of environmental education strategies.

Fast changes in seasonal forest communities due to soil moisture increase after damming / Cambios estacionales acelerados en comunidades boscosas debidos al aumento en la humedad del suelo después de la construcción de una represa

Local changes caused by dams can have drastic consequences for ecosystems, not only because they change the water regime but also the modification on lakeshore areas. Thus, this work aimed to determine the changes in soil moisture after damming, to understand the consequences of this modification on the arboreal community of dry forests, some of the most endangered systems on the planet. We studied these changes in soil moisture and the arboreal community in three dry forests in the Araguari River Basin, after two dams construction in 2005 and 2006, and the potential effects on these forests. For this, plots of 20m x10m were distributed close to the impoundment margin and perpendicular to the dam margin in two deciduous dry forests and one semi-deciduous dry forest located in Southeastern Brazil, totaling 3.6ha sampled. Besides, soil analysis were undertaken before and after impoundment at three different depths 0-10, 20-30 and 40-50cm. A tree minimum DBH of 4.77cm community inventory was made before T0 and at two T2 and four T4 years after damming. Annual dynamic rates of all communities were calculated, and statistical tests were used to determine changes in soil moisture and tree communities. The analyses confirmed soil moisture increases in all forests, especially during the dry season and at sites closer to the reservoir; besides, an increase in basal area due to the fast growth of many trees was observed. The highest turnover occurred in the first two years after impoundment, mainly due to the higher tree mortality especially of those closer to the dam margin. All forests showed reductions in dynamic rates for subsequent years T2-T4, indicating that these forests tended to stabilize after a strong initial impact. The modifications were more extensive in the deciduous forests, probably because the dry period resulted more rigorous in these forests when compared to semideciduous forest. The new shorelines created by damming increased soil moisture in the dry season, making plant growth easier. We concluded that several changes occurred in the T0-T2 period and at 0-30m to the impoundment, mainly for the deciduous forests, where this community turned into a riparian-deciduous forest with large basal area in these patches. However, unlike other transitory disturbances, damming is a permanent alteration and transforms the landscape to a different scenario, probably with major long-term consequences for the environment.

Los cambios locales provocados por las represas pueden tener consecuencias para un ecosistema, ya que no solo cambian el régimen de las aguas, sino que también modifican las áreas a la orilla de los lagos. Por lo tanto, este trabajo tuvo como objetivo observar los cambios en la humedad del suelo después de la construcción de represas, para entender las consecuencias de esta modificación a la comunidad arbórea de los bosques secos, que son uno de los sistemas más amenazados del planeta. Después de la construcción de tres represas, se estudiaron los cambios en la humedad del suelo y la comunidad arbórea en 3 bosques secos de la cuenca del río Araguari, en donde se construyeron dos represas en 2005 y 2006. Se demarcaron parcelas de 20x10m que se distribuyeron cerca y perpendicular al margen de la represa en dos bosques secos caducifolios y un bosque seco semideciduo ubicado en el sureste de Brasil, en total se muestrearon 3.6 hectáreas. Se realizó un análisis de la humedad del suelo antes y después de la construcción del embalse en tres profundidades 0-10, 20-30, 40-50cm. El inventario de la comunidad arbórea DAP de 4.77cm se realizó antes T0, dos T2 y cuatro T4 años a partir de la retención del agua. Además se calcularon las tasas anuales dinámicas de todas las comunidades, y se utilizaron pruebas estadísticas para confirmar los cambios en la humedad del suelo y las comunidades de árboles. Los análisis confirmaron aumento de humedad del suelo en todos los bosques, especialmente durante la estación seca y en los lugares más cercanos al embalse, con un aumento del área basal debido al rápido crecimiento de muchos árboles. El mayor volumen de modificaciones se produjo en los primeros dos años después de La construcción del embalse, principalmente debido a la mayor mortalidad de los árboles más cerca del margen de la represa. Sin embargo, todos los bosques mostraron reducción de las tasas dinámicas en los años siguientes T2-T4, lo que indica que estos bosques tienden a estabilizarse después de un fuerte primer impacto. Las modificaciones fueron más severas en los bosques caducifolios, probablemente debido a una estación seca más severa en estos bosques en comparación con el semideciduo. Las nuevas márgenes creadas por el embalse aumentaron la humedad del suelo en la época seca facilitando el crecimiento de muchas plantas. Se concluye que los cambios que se produjeron en el período de T0-T2 y de 0-30m del embalse, principalmente en los bosques caducifolios estan transformando estas comunidades en bosque de ribera-caducifolia con gran área basal en estos parches. Sin embargo, este impacto es diferente a otras alteraciones transitorias, así la construcción del embalse es un cambio permanente y transforma el paisaje en otro escenario, probablemente con importantes consecuencias a largo plazo para el ambiente.