Evaluation of nonparametric methods for estimating species richness of woody plants in coffee

  • Ana María López-Gómez Departamento de Ecología Funcional, Instituto de Ecología, A.C.
  • Guadalupe Williams-Linera Departamento de Ecología Funcional, Instituto de Ecología, A.C.
Keywords: biodiversity, richness estimators, shade-grown coffee plantations, species-accumulation curves, trees

Abstract

Shade-grown coffee plantations are part of the regional landscape and may contribute to the diversity of woody plants. Tree species richness was evaluated in eight active and abandoned coffee plantations. We used non-parametric (ACE, ICE, Chao 1, Chao 2, Jackknife 1, Jackknife 2, Bootstrap) and asymptotic models (Clench, Linear) to compare observed or sampled richness with estimated richness. The precision of the estimators was evaluated as bias and accuracy through the comparison of estimated richness and true (or total) richness values. Observed richness was 55 tree species in active coffee plantations and 61 species in abandoned plantations. Most species showed a clumped distribution. In no case did species-accumulation curves reach an asymptote. ICE and Chao 2 displayed the best performance. Parametric models were the least precise and Jackknife 2 was the most precise. Non-parametric estimators have disadvantages, but they appear to be appropriate to estimate richness in managed systems such as coffee plantations.

Downloads

Download data is not yet available.
Evaluation of nonparametric methods for estimating species richness of woody plants in coffee
Published
2006-06-15
How to Cite
López-Gómez, A. M., & Williams-Linera, G. (2006). Evaluation of nonparametric methods for estimating species richness of woody plants in coffee. Botanical Sciences, (78), 7 - 15. https://doi.org/10.17129/botsci.1717
Section
ARTICLES / ARTÍCULOS