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https://locus.ufv.br//handle/123456789/24106
Tipo: | Artigo |
Título: | Litter disturbance and trap spatial positioning affects the number of captured individuals and genera of crickets (Orthoptera: Grylloidea) |
Autor(es): | Sperber, Carlos F. Soares, Luiz G. S. Pereira, Marcelo R. |
Abstract: | There are several factors that may affect sampling with pitfall traps. Here we test the hypothesis that the mere walking of the researcher proximate to the traps could cause an increment in the capture of crickets. This would occur if the walking provoked vibration in the litter, to which crickets showed a jumping response, thus falling into the pitfall traps. We mounted 126 traps in 14 groups of nine. The traps within a group were positioned in three parallel rows of three traps each, one meter apart from each other. Each group of nine traps was separated from the other groups by at least 5 m. Each group of nine traps was submitted to one of seven levels of disturbance frequency. Exposure time was 7 d for all traps. Treatments (disturbance frequencies) were allocated randomly among trap groups. For the data analyses we adjusted mixed-effects polynomial models. We captured 723 cricket individuals, distributed in 10 genera, most in the nymphal stage. As expected, the number of captured individuals, as well as the number of genera, increased with disturbance frequency. However this response was not linear: at higher disturbance frequencies there was a decrease in captures. There was also an effect of trap positioning within each group: central traps were more affected by disturbance than peripheral ones, while peripheral traps captured more individuals and genera in the absence of disturbance. Therefore we recommend areas near pitfall traps not be visited during the trapping period. Alternatively, to enhance sampling efficiency, the researcher may do programmed visiting to the trapping area, but this must be rigorously designed to provoke exactly the same disturbance for all traps. Enhancing the distance among traps will augment efficiency in capturing individuals and capture larger cricket diversity. Further studies of the interaction between methodology and cricket behavior will refine our ability to design and interpret pitfall studies. |
Palavras-chave: | Crickets Jumping response Litter disturbance Pitfall trap Spatial positioning Substrate vibration |
Editor: | Journal of Orthoptera Research |
Tipo de Acesso: | Open Access |
URI: | https://bioone.org/journals/journal-of-orthoptera-research/volume-16/issue-1/1082-6467(2007)16%5b77%3aLDATSP%5d2.0.CO%3b2/Litter-disturbance-and-trap-spatial-positioning-affects-the-number-of/10.1665/1082-6467(2007)16[77:LDATSP]2.0.CO;2.full http://www.locus.ufv.br/handle/123456789/24106 |
Data do documento: | 2007 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf | Texto completo | 3,08 MB | Adobe PDF | Visualizar/Abrir |
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