Resumo

QUESADA-ACUNA, Sergio Gabriel  e  GOMEZ, Gabriela Pérez. Effect of trap size when quantifying plant material fall. Cuadernos de Investigación UNED [online]. 2023, vol.15, n.1, pp.40-48. ISSN 1659-4266.  http://dx.doi.org/10.22458/urj.v15i1.4368.

Introduction: Many natural phenomena studied by ecologists (e.g. seed rain, litter production) require quantitative methods that collect data in the absence of the researcher, favoring for example traps. Traps vary in shape, size, and material, and their selection should be carefully considered. There are few studies that compare the performance of traps of different sizes and their effect on estimates. Objective: To compare two sizes of a common trap designed to quantify the fall of plant material. Methods: In a tropical urban park in San José, Costa Rica, we placed a total of 74 square traps (large trap= 0,50m2, with a concentric 0,25m2 subsection representing the small trap) in three microhabitats (grass; forest edge and under isolated trees). From July 2021 to June 2022 we collected the tramp contents twice a month (annual sampling effort: 144 hours per trap). Results: The large trap results in lower density estimates, leading to higher errors and standard deviations. The small trap estimates higher densities but reduces the standard deviation and error. The coefficients of variation of both traps were similar. Conclusion: Vegetation trap studies must consider the effect of trap size on density estimates, error estimates and standard deviations.

Palavras-chave : Dispersion; natural regeneration; seed rain; seed trap; trap size; urban park..

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