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Issues to consider when sampling the sandhopper Atlantorchestoidea brasiliensis (Dana, 1853) for impact assessments on sandy beaches

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posted on 2019-10-22, 10:35 authored by Leonardo Lopes Costa, Ilana Rosental Zalmon

Pitfalls can trap mobile fauna during their peak surface activity, whereas sediment corer efficiently capture individuals buried in the substrate. Corer sampling is the most used method to capture the sandhopper Atlantorchestoidea brasiliensis, because of the assumption that bias related to surface activity during daylight can be controlled by a careful sampling. The objective of the present study was to evaluate the efficiency of pitfalls to sample the sandhopper A. brasiliensis on sandy beaches with distinct impact levels. We compared our results with a previous impact assessment on the same beach arc that used corer sampling. The sandhopper abundance was more than 10 times higher in the pitfalls compared to the corer samples, suggesting prevalent activity on the sediment surface during daylight and possible bias when using corer sampling to estimate population size. The conclusion of the previous impact assessment, however, was not strongly affected by sampling tools, because seasonal trampling seems to be negative for the number of buried and surface-active individuals. Our results showed that the choice of sampling tool is an important issue to be considered when using sandhoppers as indicator species on sandy beaches.

Funding

This work was supported by the Research Foundation of Rio de Janeiro – FAPERJ under grant E-26/111.395/2012, Brazilian Agency for Research Development – CNPq under grant 470142/2013-8. Costa, L.L was supported by the Research Foundation of Rio de Janeiro – FAPERJ (E-26/200.813/2019); Conselho Nacional de Desenvolvimento Científico e Tecnológico; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro.

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