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Species richness and density evaluation for plants with aggregated distributions:fixed *** area methods

Journal of Plant Ecology 2017年第5期10卷 765-770页

作者： rita de cássia quitete portela Alexandra dos Santos Pires Maria Isabel Guedes Braz Eduardo Arcoverde de Mattos departamento de Ecologia Instituto de BiologiaUniversidade Federal do Rio de JaneiroCaixa Postal 68020Ilha do FundãoRio de JaneiroRJ 21941-590Brasil departamento de ciências Ambientais Instituto de FlorestasUniversidade Federal Rural do Rio de JaneiroRod.BR 465Km 07Cidade UniversitáriaSeropédicaRio de JaneiroRJ 23890-000Brasil

Aims Knowledge of species richness is of prime importance to both basic and applied aspects of ecological ***,quantifying plant species richness in the tropics is potentially time-consuming because of high species *** species richness estimates are also frequently biased,because many rare species are not *** address these problems,the use of a variable area method has been proposed as an alternative to fixed area methods,but its appli-cability to plants with aggregated distributions has been questioned based on simulation *** use empirical data to compare the efficiency and accuracy of a variable area method and a fixed area method for estimating species richness,density and basal area for plants with aggregated distributions,using palms as a model *** Adult palms were sampled in twenty 10×30 m transects in an Atlantic Forest in Rio de Janeiro state,*** individuals were considered in the fixed area method,while in the variable area method only the first six adults in each transect were sampled;in this case,transect length was defined according to the distance of the sixth adult from the beginning of the *** fewer than six individuals were observed in a given transect,transect length was extended up to 50 m to search for additional *** efficiency of both methods was compared based on species rarefaction curves,using the chao 1 statistic(for abundance data).For each species we calculated mean density per transect and basal area,according to each sampling *** effort in terms of the number of individual plants and the area necessary to characterize maximum species richness in each sampling method,as well as mean time taken to sample a single transect,were compared as measures of *** findings An accurate estimate of species richness was achieved using both methods,but in the variable area method,a quarter of the number of individuals and half the area was sufficient

关键词： basal area biodiversity inventory palms taxon sampling

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