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Vegetation-environment relationships based on a life-forms classification in a semiarid region of tropical Mexico.
Zavala-Hurtado, J A; Valverde, P L; Díaz-Solís, A; Vite, F; Portilla, E.
Afiliação
  • Zavala-Hurtado JA; Departamento de Biología, Universidad Autónoma Metropolitana- Iztapalapa, D.F. México. jazh@xanum.uam.mx
Rev Biol Trop ; 44(2A): 581-90, 1996 Aug.
Article em En | MEDLINE | ID: mdl-9246368
Taking the view that morphological characteristics represent behavioral strategies of plants to cope with environmental pressures, we defined 18 life-forms, using multivariate classification techniques in a tropical semiarid ecosystem in Central Mexico. A multiple discriminant analysis confirmed the existence of these groups. A null model of random membership of species to life-forms was significantly different from our classification. Vegetation-environment relationships were examined with Detrended Canonical Correspondence Analysis (DCCA). Ordination axes were interpreted mainly be altitude and soil moisture. Response curves of life-forms along these gradients were explored fitting generalized linear models (GLIM's). We believe that the life-forms approach for the study of vegatation-environment relationships is a valid alternative to the traditional species approach usually used in physiological research because: i) life-forms number was found to be an excellent species diversity predictor, ii) this approach enables considerable reduction in the bulk of data without losing ecological information, and iii) life-forms represent ecological strategies per se and, they constitute an index of the number of different ways the desert's resources are utilized.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Filogenia / Ecossistema Tipo de estudo: Prognostic_studies País/Região como assunto: Mexico Idioma: En Revista: Rev Biol Trop Ano de publicação: 1996 Tipo de documento: Article País de publicação: Costa Rica
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Filogenia / Ecossistema Tipo de estudo: Prognostic_studies País/Região como assunto: Mexico Idioma: En Revista: Rev Biol Trop Ano de publicação: 1996 Tipo de documento: Article País de publicação: Costa Rica