Reinaldo Farias Paiva de Lucena

Use and knowledge of Cactaceae in Northeastern Brazil.

BackgroundThis study aimed to record the use, and knowledge that residents from São Francisco community (Paraiba, Brazil) have regarding the Cactaceae.MethodsSemi-structured interviews were carried out with 118 informants; 50 men and 68 women. The cacti cited in this study were organised into use categories and use values were calculated. Differences in the values applied to species and use categories by men and women were compared via a G test (Williams).ResultsThe nine species identified were: Cereus jamacaru DC., Melocactus bahiensis (Brtitton & Rose) Luetzelb., Nopalea cochenillifera (L.) Salm-Dyck., Opuntia ficus indica (L.) Mill, Opuntia stricta (Haw.) Haw., Pilosocereus gounellei (F.A.C. Weber) Byles & Rowley, Pilosocereus pachycladus F. Ritter, Tacinga inamoena (K. Schum) N.P. Taylor & Stuppy, Tacinga palmadora (Britton & Rose) N.P. Taylor & Stuppy. In total, 1,129 use citations were recorded, divided into 11 categories. The use value categories with the highest scores were forage (0.42), food (0.30) and construction (building) (0.25). P. pachycladus showed the greatest use value, versatility and number of plant parts used.ConclusionThe survey showed that the Cactaceae is extremely important for several uses and categories attributed to different species. Apart from contributing to the ethnobotanical knowledge of the Cactaceae, another important focus of this study was to reinforce the necessity for further studies that record the traditional knowledge about this plant family, which has been lost in younger generations.

Knowledge and Use of Wild Food Plants in Areas of Dry Seasonal Forests in Brazil

The investigation aimed to compare the knowledge about food plants in rural communities of the Caatinga. The study was conducted in two rural communities in northeastern Brazil. Data collection utilized different ethnobotanical methods, including free listing, semi-structured interviews, and recall. Native species are less frequently consumed as food in both locations. Fruits are the most frequently cited wild resource, but in practice, most of this food availability potential is wasted. Despite community knowledge about wild species with potential food, few species are actually utilized, and thus, many plants are not included in the diets of the populations studied.

Local knowledge about fodder plants in the semi-arid region of Northeastern Brazil.

BackgroundThis study evaluated local knowledge of the fodder plants of the Caatinga in northeast Brazil (seasonal dry forest). Specifically, the goal was to catalog local knowledge regarding the use of native and exotic forage plants in two rural communities located in the state of Paraíba (northeast Brazil), to provide information for nutritional investigations and to verify how the knowledge of these resources is distributed.MethodsThe communities were followed for three consecutive years, and interviews were conducted with 44 families (20 men and 24 women). Nine of these individuals were determined by the snowball technique to be key informants who held more specific knowledge about the topic. The data were structured into a database and statistically analyzed.ResultsOverall, 136 plants from 37 families and 113 genera were cited, and the knowledge of men was at a higher level than that of women (p < 0.05). Participants demonstrated a sophisticated knowledge of nutritional characteristics such as nutritional value, palatability, availability and productivity. Native plants were highlighted over the exotic, especially for species of the families Cactaceae, Bromeliaceae and Fabaceae.ConclusionsThe great diversity of plants cited by the informants demonstrates the potential of local vegetation and the importance of traditional knowledge in the research process and in the characterization of forage resources. This diversity also favors the selection of promising species for future biotechnological investigations.

Conservation priorities of useful plants from different techniques of collection and analysis of ethnobotanical data

This study analyzes three methods of data analysis to verify which one would be more appropriate to get information aiming the conservation, selecting the use value (VU) inventory in situ and conservation property index (IPC). It was developed in in Northeast Brazil, via interviewed householders (46 informants). The VU was calculated considering only the effective use of plants; the inventory in situ was made through the frequency of species occurrence in homes; and the IPC combining ethnobotanical and phytossociological data. It was observed a similar cast of the indicated species by VU and inventory in situ, being different from the IPC cast. As this study sought to analyze the best technique for species identification which were needing conservationist actions, and obtained different results among the chosen methods. It has been suggested the use of methods that unite in their analysis both ethnobotanical and ecological aspects, like in the plants list from the priority index of conservation, which demonstrated to be more efficient to identify rare species in the local vegetation. The VU and the inventory in situ are more efficient to identify the most known and used species in the communities, however without analyzing these plants in the local vegetation.

What drives the knowledge and local uses of timber resources in human-altered landscapes in the semiarid region of northeast Brazil?

The demand for timber resources is one of the primary drivers of landscape modification and biodiversity loss, but little information is available about the domestic use of these resources. A study was conducted in rural communities (northeast Brazil) to identify the factors that influenced the use and knowledge of these resources and how these factors were modified over time and influenced by environmental and cultural changes. Despite the local knowledge of a wide variety of timber products, most people used only some of these products; the used products had a constant replacement frequency and a wider range of source species. Although the studied communities were located in the same environmental context, the different regimes of access to forest resources in the region appeared to exert a significant influence on the use and diversity of the collected timber species. Thus, it is necessary for managers to consider both the specific characteristics of each site and particular groups of the same population when planning to promote the sustainable use of forest resources.

Alternative Views of Folk Classification

Brent Berlin suggested general and universal principles of classification and nomenclature for living beings, which have been undertaken by different researchers. However, some scientists have put forth a set of evidence that does not corroborate some of the Berlin principles. They suggest that classifications exhibit characteristics that can vary in different cultures, without following universal principles. Thus, criticism of the universal principles of folk taxonomy has emerged, showing that different cultures and societies use different cognitive schemes to classify living beings, without adherence to the plan devised by Berlin. Researchers are proposing competing ideas to the universal principles to better understand how different human groups classify living beings. Thus, the major criticisms of Berlin’s folk classification model will be presented in this chapter, as well as discussion of an alternative proposal to understand folk classification and current advances in studies on this topic.

Cuantificación fisicoquímica en gorro turco [Melocactus zehntneri (Britton & Rose) Luetzelburg - Cactaceae]

In Northeast Brazil, the use of melon cactus (Melocactus spp.) is quite common and varied. Thus, the present study aimed to perform various analyzes in cladodes of melon cactus [Melocactus zehntneri (Britton & Rose) Luetzelburg], to understand the reasons for the use of this species. The cladodes were collected in the city of Campina Grande and taken to the Food Engineering Laboratory of the Federal University of Campina Grande, where we performed the following analyses: mass, height, diameter, color, moisture, acidity, pH, ascorbic acid, carotenoids, flavonoids and phenolic compounds, both in the epidermis and in the aquifer parenchyma. The results showed that the epidermis has a higher acidity, ascorbic acid content and lower pH compared to the aquifer parenchyma. The contents of carotenoids, flavonoids and phenolic compounds, were different from the both parts analyzed. The epidermis always had greater quantities of carotenoids, flavonoids and phenolic compounds than the aquifer parenchyma for the three plants, showing that most of the plant defense takes place in this tissue. Further studies, with more accurate techniques, are needed to identify the bioactive components of this species.

Quantification Physicochemical in Melon Cactus [Melocactus zehntneri (Britton & Rose) Luetzelburg - Cactaceae].

In Northeast Brazil, the use of melon cactus (Melocactus spp.) is quite common and varied. Thus, the present study aimed to perform various analyzes in cladodes of melon cactus [Melocactus zehntneri (Britton & Rose) Luetzelburg], to understand the reasons for the use of this species. The cladodes were collected in the city of Campina Grande and taken to the Food Engineering Laboratory of the Federal University of Campina Grande, where we performed the following analyses: mass, height, diameter, color, moisture, acidity, pH, ascorbic acid, carotenoids, flavonoids and phenolic compounds, both in the epidermis and in the aquifer parenchyma. The results showed that the epidermis has a higher acidity, ascorbic acid content and lower pH compared to the aquifer parenchyma. The contents of carotenoids, flavonoids and phenolic compounds, were different from the both parts analyzed. The epidermis always had greater quantities of carotenoids, flavonoids and phenolic compounds than the aquifer parenchyma for the three plants, showing that most of the plant defense takes place in this tissue. Further studies, with more accurate techniques, are needed to identify the bioactive components of this species.

Quantificação Fitoquímica da coroa-de-frade [Melocactus zehntneri (Britton & Rose) Luetzelburg - Cactaceae].

In Northeast Brazil, the use of melon cactus (Melocactus spp.) is quite common and varied. Thus, the present study aimed to perform various analyzes in cladodes of melon cactus [Melocactus zehntneri (Britton & Rose) Luetzelburg], to understand the reasons for the use of this species. The cladodes were collected in the city of Campina Grande and taken to the Food Engineering Laboratory of the Federal University of Campina Grande, where we performed the following analyses: mass, height, diameter, color, moisture, acidity, pH, ascorbic acid, carotenoids, flavonoids and phenolic compounds, both in the epidermis and in the aquifer parenchyma. The results showed that the epidermis has a higher acidity, ascorbic acid content and lower pH compared to the aquifer parenchyma. The contents of carotenoids, flavonoids and phenolic compounds, were different from the both parts analyzed. The epidermis always had greater quantities of carotenoids, flavonoids and phenolic compounds than the aquifer parenchyma for the three plants, showing that most of the plant defense takes place in this tissue. Further studies, with more accurate techniques, are needed to identify the bioactive components of this species.