Sampling efficiency of a protocol to measure Odonata diversity in tropical streams
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2021
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Odonata can be sampled following different types of protocols. In Brazil, the most used protocol
is the scanning in fixed areas method, where a 100-meter transect is delimited in one
of the stream margins, subdivided into 20 segments measuring 5 meters. Despite being universally
used, the methodological efficiency or limitations of this protocol for Odonata has
never been tested. In this scenario, our objective was to assess the efficiency of the sampling
protocol to measure the richness and composition of Odonata in three fundamental
aspects: the time of sampling and sampling effort over time and space. We show that the
best sampling efficiency was achieved in collections performed at noon, in transects measuring
100 meters, requiring at least two samplings in the same location, supporting the procedures
traditionally adopted by many studies with the group. While comparing species
composition, we did not see any implication between the different treatments on the capture
of the local species pool. However, we highlight and discuss some possible methodological
flaws when using this protocol to sample specific Odonata groups. We believe the results
obtained are fundamental in the inventory of species and to conduct future studies, as well
as to aid conservative measures that use the order Odonata as a tool for environmental
monitoring.
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BATISTA, Joana Darc; FERREIRA, Victor Rennan Santos; CABETTE, Helena Soares Ramos; CASTRO, Lourivaldo Amancio de; MARCO, Paulo De; JUEN, Leandro. Sampling efficiency of a protocol to measure Odonata diversity in tropical streams. PLoS One, San Francisco, v. 16, n. 3, e0248216, 2021. DOI: 10.1371/journal.pone.0248216. DisponĂvel em: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0248216. Acesso em: 6 fev. 2023.