生物多样性、生物勘探与发展杂志

Objective: Edible plants of medicinal value can serve as a resource for sustainable development in Ecuador, a country rich in agrobiodiversity and traditional ecological knowledge. This study surveyed the nematicidal, antimicrobial, and antioxidant potential of plants sold in local Ecuadorian markets through participatory scientific discovery workshops with local Ecuadorian students and researchers, while simultaneously enhancing the knowledge and technological capacity of workshop participants.

Methods: Edible plants were purchased from city markets at 3 distinct research sites in Ecuador - Cuenca, Quito, and Santa Elena. Botanical identification and traditional uses of each plant were assessed via herbarium specimen preparation and reference to ethnobotanical texts. Portable screens-to-nature (STN) extraction and assay technologies were employed to rapidly and qualitatively detect roundworm lethality, antibacterial, antifungal, and free radical scavenging activities of the plants during 3-day STN workshops at each research site. Participant learning was assessed through a retrospective pretest-posttest administered at the end of each STN workshop.

Results: A total of 50 plants were collected, representing 30 vascular plant families and a wide variety of traditional uses. Thirty-two participants among 3 STN workshops identified 1 plant with nematicidal activity, 14 plants with antibacterial activity, 20 plants with antifungal activity, and 41 plants with antioxidant activity. Nearly half of the plants (24 species) demonstrated both antimicrobial and antioxidant activities, correlating to their reported uses to treat both infectious and chronic/metabolic disorders in traditional Ecuadorian medicine. During the STN workshops, participant knowledge of pharmacological screening increased by 77%, whereas knowledge of biodiversity and conservation increased by 69%.

Conclusion: This study demonstrated that STN technologies, employed through a participatory research approach, are highly efficient in the detection of biochemical activities of traditionally used plants. Furthermore, edible Ecuadorian plants possess nematicidal, antimicrobial and antioxidant properties with potential for further development as functional foods, botanical supplements, or cosmetics.

The intertidal mangrove ecosystem of Indian Sundarban is now as a critical ecosystem due to climate changeinduced sea level rise. The present study analyses the responses, migration, destruction and vulnerability of the four deltaic mangrove ecosystem, such as Jambudwip, Bulcherry, Dalhousie and Bangaduni Islands along the ocean sides. The changes in this deltaic ecosystem studied by using GIS and remote sensing with collecting data about sea level of nearest tidal gauge station Haldia (2.59 ± 1.0 mm/year) and Diamond Harbor (4.67 ± 0.68 mm/year). The study finds that if the sea level rises about mangrove surface, the mangrove retreats landward and also decline the land areas, increases soil erosion that affected in the southern and south-western part where these vulnerable mangrove islands are located. Moreover, the study indicates that the low-level mangrove islands would threaten with the rates of increasing sea level under present climate change. However, the amount of net loss is about 10009 ha at the rate of 164.08 ha per year of the four more vulnerable islands. In the context of climate change induced sea level rise there also needs long-term thinking and coastal zone management option that must have economic feasibility. Thus, the dynamics of the mangrove ecosystem in response to projected sea level rise enable to take appropriate planning for reducing threats and human safety along the coastal areas.

The jaguar (Panthera onca, Linnaeus 1758) and cougar (Puma concolor, Linnaeus 1771) are the largest cats in the Americas and are listed as uniquely extinct in El Salvador, Central America. The contributory factors for this event are little understood and/or ignored. This omission hampers conservation planning for declining big cat populations in other countries. A thorough review and analysis of the literature reveals important gaps that impede assessment of the factors for big cat extinction, and also possible meliorative efforts. The evidence questions the commonly blamed civil war and deforestation, and critically assesses a wider set of factors mostly not linked to big cat extinction; dense human population, small national territory, border porosity, cat adaptability to modified land cover and the actual importance of connecting forested corridors. The evidence from other countries shows possibilities of cat adaptability to all possible factors for extinction, but also hints at the possibility of the lack of connecting corridors as uniquely negative in El Salvador. Reintroductions of big cats in El Salvador must include internationalized assessments of their ecology and public tolerance of cat presence. It is imperative that generalized assumptions of cat extinction, e.g. the civil war and deforestation, and human population density are critically reviewed. Full conservation of big cats in the region requires reintroductions based on such critically acquired knowledge, rather than further debate