Density-dependent regulation in a weed Bidens sulphurea (Cav.) Sch. Bip. (Asteraceae)

Natália de Freitas Medeiros, Diana Pacheco Seixas, Janaina Correia Batista, Wanessa Rejane Almeida, Jean Carlos Santos


The density effects on performance of a weed Bidens sulphurea (Asteraceae) were evaluated experimentally. There are very few studies available to improve the process of density-dependent to invasive species. It was used an experimental set-up in which the population of this weed species is partitioned into different density groups (1, 2, 4 and eight plants per pot) based on local conspecific density to investigate density-based population strategies. The difference between the greatest and the lowest density (8 and 1 plant per pot) was considerably high, around 41%, regarding the variables measured (stem height and diameter, leaf number and size). Plants at higher densities have become taller and thinner as a consequence of intraspecific competition. Therefore, the results suggest that the responses of B. sulphurea in dense populations can affect the persistence of population over time. These results may be useful in the future for the biological control of this species.



intraspecific competition, invasive species, plant performance, population ecology

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