Abstract

SOUZA DINIZ, Écio; PAVANELLI, Ana Paula  and  SOARES JUNIOR, Flávio José. Structure analysis of a population of Lychnophora pinaster Mart., in campo rupestre, southern Minas Gerais, Brazil, by means of multivariate statistical. Ecol. apl. [online]. 2010, vol.9, n.2, pp.141-149. ISSN 1726-2216.

The brazilian Cerrado is characterized by high endemism of botanic taxa; many of recognized herbal and or economic importance. A taxon that stands out for these conditions, Lychnophora pinaster Mart. (Arnica-brazilian) is widely exploited for its therapeutic qualities. Thus, the present study was undertaken to elucidate the strategies of occupation of space by a population of L. pinaster, analyzing the traditional parameters of structure in multivariate analysis. For this purpose, 30 plots contiguous of 10mx10m were allocated in a Campo Rupestre stretch, inside of which DAS and the heights of all plants of that species were measured. The structural parameters obtained for the population were treated by simple Euclidean distance coefficient and then analyzed by UPGMA, complete linkage, and PCoA. Cluster Analyses showed consistency in large groups, set up in high levels of fusion. Among the tests performed, the UPGMA without the variable "volume" (C.Cf.=0.884539) determined six major groups to the fusion level 20, with three of them standing out by the differences in abundance, average height and diameter per plot. In this case, the ordination analysis revealed 74.94% of variance accumulated on an axis. Finally, Cluster Analysis by Complete Link for "tiller" (C.Cf.=0.730747), showed two major groups at fusion 17, determined by the irregular distribution of plots by individuals no affiliated. This distribution certainly reflects the conditions of the hilly topography and rock outcrops within the study area.

Keywords : Arnica; Cerrado; Cluster; Ordination.

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