Species abundance distribution in tree community of a hill top in subtropical seasonal forest

Ciência Rural

Andriollo, Daiane Deckmann²  Costa, Malcon do Prado³  Fávero, Alessandro Abreu²  Figueira, Maurício²  Longhi, Solon Jonas¹ 

[1] Universidade Federal do Paraná, Curitiba, Brazil;Universidade Federal de Santa Maria, Santa Maria, Brazil;Universidade Federal do Rio Grande do Norte, Macaíba, Brazil

关键词: trees;    curves Whittaker;    biological diversity;    ecological dominance;    forest ecology;   

DOI  :  10.1590/0103-8478cr20121238

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

Ecological Models of Species abundance distribution (SADs) of a tree community were investigated to find: (i) if environmental variables are divided stochastically and similarly between species; (ii) if each species exhausts more than half of the existing ecological niche; (iii) if the tree community has many species with intermediate levels of abundance and a few rare and common species; (iv) and if, in secondary succession, the later colonizing species have greatest needs for a specialized niche, so, they are more rare than the initial colonizers species. The data were obtained in eight sampling units with dimensions of 20m x 50m, distributed in a systematic way, totaling 0.8 ha sample; grouped in five models of SADs (broken-stick, niche-preemption, lognormal, Zipf and Zipf-Mandelbrot) for the sample of the tree community and the eight sampling units; the criteria of accuracy of the models were: Akaike, Bayesian and Deviance. The ecological model described the SADs that rank/abundance of tree species for ecological community which was the Zipf-Mandelbrot. The ecological models of SADs that characterized the eight sampling units were niche-preemption, Zipf and Zipf-Mandelbrot. The Zipf-Mandelbrot model postulates the colonization of species under the requirements of environmental preconditions for the establishment of the species, and thus detects up an arboreal community stage of maturity. The ecological models of SADs obtained for the sampling units, separately, show the disparity in the distribution of species abundance within the tree community that was interpreted as the effect of heterogeneity of conditions and environmental resources, and natural disturbances, originating a mosaic vegetation.

【 授权许可】

Unknown