title: Distribution, management and diversity of the endangered Amerindian yam (Dioscorea trifida L.).
abstract: The objective of this study was to verify the occurrence of Dioscorea trifida in Brazil and to obtain information concerning its distribution, management and diversity. Farmers from 21 communities were interviewed in the states of São Paulo, Santa Catarina and Mato Grosso. During the visits, semi-structured interviews were conducted to collect socio-economic, management and diversity data for this crop. Fifty-one collected accessions, plus two accessions obtained at local markets of Amazonas, were characterized using 12 morphological traits. Most the interviewed farmers were men (75%) with a mean age of 59.5 years. Just a few young people and labor force were available for agricultural activities, with an average of only three individuals per farm. Most farmers (56%) grew only one variety of D. trifida, although 44% had more than one variety in their fields, which aims to provide greater assurance at harvest. Many popular names were observed for D. trifida, and cará roxo (purple yam) was the name most used by farmers (43.4%). Characters referring to the tuber, such as skin and flesh color, were most relevant for the distinction of the accessions. The results of this study may collaborate to develop strategies for conservation, both ex situ and in situ, within the view of on farm conservation.
authors.affiliation: Centro de Ciências Agrárias e Ambientais, Universidade Federal do Maranhão, Chapadinha, MA, Brazil.
authors.forename: W F
authors.initials: WF
authors.lastname: Nascimento
authors.affiliation: Central de Laboratórios de Pesquisa, Ciência e Tecnologia Ambiental, Universidade Sagrado Coração, Bauru, SP, Brazil.
authors.forename: M V B M
authors.initials: MV
authors.lastname: Siqueira
authors.affiliation: Faculdade de Ciências Agronômicas de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho", Botucatu, SP, Brazil.
authors.forename: A B
authors.initials: AB
authors.lastname: Ferreira
authors.affiliation: Faculdade de Ciências Agronômicas de Botucatu, Universidade Estadual Paulista "Júlio de Mesquita Filho", Botucatu, SP, Brazil.
authors.forename: L C
authors.initials: LC
authors.lastname: Ming
authors.affiliation: Departamento de Ecologia e Zoologia, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
authors.forename: N
authors.initials: N
authors.lastname: Peroni
authors.affiliation: Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brazil.
authors.forename: E A
authors.initials: EA
authors.lastname: Veasey
mesh_terms: D000328:Adult; D000368:Aged; D044822:Biodiversity; D001938:Brazil; D018556:Crops, Agricultural; D027742:Dioscorea / Q000033:anatomy & histology / Q000145:classification*; D000067565:Farmers / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012959:Socioeconomic Factors