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Related Experiment Video

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Propagation of the Microsporidian Parasite Edhazardia aedis in Aedes aegypti Mosquitoes
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Functional response of Cosmoclopius nigroannulatus (Hem.: Reduviidae) to different densities of Spartocera

L da Rocha1, L R Redaelli

  • 1PPG Biologia Animal, Instituto de Biociências, UFRGS, Av. Bento Gonçalves, 9500, CEP 91501-970, Porto Alegre, RS, Brazil. lucianerrocha@yahoo.com.br

Brazilian Journal of Biology = Revista Brasleira De Biologia
|October 7, 2004
PubMed
Summary
This summary is machine-generated.

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Female predators, Cosmoclopius nigroannulatus, consumed more Spartocera dentiventris nymphs than males, demonstrating higher predatory efficiency. Their functional response to prey density followed a Type II model, crucial for integrated pest management in tobacco cultivation.

Area of Science:

  • Ecology
  • Entomology
  • Pest Management

Background:

  • Cosmoclopius nigroannulatus is a predator of Spartocera dentiventris.
  • Both species are associated with Nicotiana tabacum (tobacco).
  • Understanding predator-prey dynamics is vital for integrated pest management.

Purpose of the Study:

  • To evaluate the functional response of C. nigroannulatus on S. dentiventris nymphs.
  • To determine how prey density affects predation rates.
  • To compare the predatory efficiency between male and female C. nigroannulatus.

Main Methods:

  • Laboratory experiments were conducted under controlled conditions (27°C, 80% RH, 12h photophase).
  • Five densities of S. dentiventris nymphs (5-45 individuals) were exposed to ten adult C. nigroannulatus of each sex.

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  • Predation was recorded over five days to calculate functional response parameters.

    • Main Results:

    • A positive correlation was observed between prey density and the number of nymphs consumed.
    • Female predators consumed significantly more nymphs than males.
    • Handling time per prey was lower in females (1.93 h) than males (3.07 h).
    • Predatory efficiency was higher in females.

    Conclusions:

    • C. nigroannulatus exhibits a Type II functional response, fitting the Holling's discs equation.
    • Female C. nigroannulatus are more efficient predators of S. dentiventris nymphs.
    • These findings support the potential use of C. nigroannulatus in biological control strategies for tobacco pests.