1,720,983 research outputs found
Potential answers to the adaptation to and mitigation of climate change through the adoption of underutilised crops
No full textStudies on the diversity of underutilised tropical fruits and their adaptation to ecosystems in a changing climate
No full textQuantifying the global environmental niche of an underutilised tropical fruit tree species using herbarium records
No full textThe importance of identifying the environmental adaptation of underutilised species such as tamarind (Tamarindus indica) and their ecogeographic distribution is widely recognised. Lack of physiological or quantitative yield/growth data does not permit the use of more traditional methods of crop modelling. In this study a representative dataset of tamarind’s global distribution appropriate for modelling the species distribution is produced mainly from herbarium records; while minimising the effects of error and bias inherent with such data.Techniques were used to address bias and to flag erroneous data points. Most erroneous points were identified through the process of geographical validation. Groups of outliers were found isolated both environmental and geographical space. The exploratory analysis of the clean dataset also showed that both at the bioregional and sub regional scale tamarind experiencing different conditions in different regions. This indicates the existence of spatial nonstationarity, which due to the semi domesticated nature of the species, could be caused by evolution of the niche. Spatial niche variation in tamarind indicates that its range may have been expanded east from Africa into regions with a less pronounced dry period and with lower maximum temperatures. Difference in environmental niche between East African and West African populations is assumed to be due to the role of the Rift Valley preventing gene flow between the two regions of the continent. The implication of spatial nonstationarity and spatial variation within the niche, when considering using global or regional/multi-scale models to predict the world distribution of such species under current and future climate scenarios are discussed
Composition
No full textSpecies of Ziziphus are considered to be multipurpose plants although use of the fruits is the major focus of interest. They are of increasing use in agroforestry. The composition of the fruits is therefore of importance especially since they are produced by a limited number of species which have been cultivated for millennia. There is a great deal of published data on the potential of the species for ethnobotanical uses (Arndt and Kayser, 2001). Pareek (2001) noted that although different parts of the plant have medicinal value due to their constituents their usage appears to be sporadic and not commonplace. This chapter looks in particular at the nutritive composition of fruits and then provides a summary of the more important ethnopharmacological compounds and their properties, when known
Predicting suitable areas for the production of tamarind (Tamarindus indica L.) an underutilized fruit tree species
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Challenges to stimulating the adoption and impact of indigenous fruit trees in tropical agriculture
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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