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Weevil x Insecticide: Does 'Personality' Matter?

Morales, Juliana A ; Cardoso, Danúbia G ; Della Lucia, Terezinha Maria C ; Guedes, Raul Narciso C Briffa, Mark

PloS one, 2013-06, Vol.8 (6), p.e67283 [Periódico revisado por pares]

United States: Public Library of Science

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  • Título:
    Weevil x Insecticide: Does 'Personality' Matter?
  • Autor: Morales, Juliana A ; Cardoso, Danúbia G ; Della Lucia, Terezinha Maria C ; Guedes, Raul Narciso C
  • Briffa, Mark
  • Assuntos: Agriculture ; Agrochemicals ; Animal behavior ; Animals ; Behavior, Animal - drug effects ; Bioassays ; Biological Assay ; Biology ; Corn ; Deltamethrin ; Empirical analysis ; Exploration ; Exposure ; Grain ; Insecticide Resistance ; Insecticides ; Insecticides - pharmacology ; Insects ; Lethality ; Mitochondrial DNA ; Nitriles - pharmacology ; Personality ; Pesticide resistance ; Pesticides ; Physiological aspects ; Population ; Populations ; Pyrethrins - pharmacology ; Sitophilus zeamais ; Studies ; Survival ; Transposition ; Tribolium confusum ; Turning behavior ; Variation ; Weevils - drug effects
  • É parte de: PloS one, 2013-06, Vol.8 (6), p.e67283
  • Notas: Competing Interests: The authors have declared that no competing interests exist.
    Conceived and designed the experiments: JAM TMCDL RNCG. Performed the experiments: JAM DGC. Analyzed the data: JAM RNCG. Contributed reagents/materials/analysis tools: TMCDL RNCG. Wrote the paper: JAM RNCG.
  • Descrição: An insect's behavior is the expression of its integrated physiology in response to external and internal stimuli, turning insect behavior into a potential determinant of insecticide exposure. Behavioral traits may therefore influence insecticide efficacy against insects, compromising the validity of standard bioassays of insecticide activity, which are fundamentally based on lethality alone. By extension, insect 'personality' (i.e., an individual's integrated set of behavioral tendencies that is inferred from multiple empirical measures) may also be an important determinant of insecticide exposure and activity. This has yet to be considered because the behavioral studies involving insects and insecticides focus on populations rather than on individuals. Even among studies of animal 'personality', the relative contributions of individual and population variation are usually neglected. Here, we assessed behavioral traits (within the categories: activity, boldness/shyness, and exploration/avoidance) of individuals from 15 populations of the maize weevil (Sitophilus zeamais), an important stored-grain pest with serious problems of insecticide resistance, and correlated the behavioral responses with the activity of the insecticide deltamethrin. This analysis was performed at both the population and individual levels. There was significant variation in weevil 'personality' among individuals and populations, but variation among individuals within populations accounted for most of the observed variation (92.57%). This result emphasizes the importance of individual variation in behavioral and 'personality' studies. When the behavioral traits assessed were correlated with median lethal time (LT50) at the population level and with the survival time under insecticide exposure, activity traits, particularly the distance walked, significantly increased survival time. Therefore, behavioral traits are important components of insecticide efficacy, and individual variation should be considered in such studies. This is so because population differences provided only crude approximation of the individual personality in a restrained experimental setting likely to restrict individual behavior favoring the transposition of the individual variation to the population.
  • Editor: United States: Public Library of Science
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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