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Relationship Between Body Mass and Forewing Length in Neotropical Ichneumonidae (Insecta: Hymenoptera).

M Mazón1,2, C Nuñez-Penichet3,4, M E Cobos3,4

  • 1Programa de Investigación en Biodiversidad y Servicios Ecosistémicos, Univ Nacional de Loja, Ciudadela Universitaria, sector La Argelia, EC 110101, Loja, Ecuador. marinamazonmor@gmail.com.

Neotropical Entomology
|June 20, 2020
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Summary

Insect biomass is declining globally. This study validates forewing length as a reliable estimator for insect body mass in Neotropical Ichneumonidae, aiding biomass monitoring efforts.

Keywords:
EcuadorVenezuelabiomasslog-linear modelmorphometryparasitoids

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Area of Science:

  • Ecology
  • Entomology
  • Biometry

Background:

  • Insect biomass is a crucial ecological indicator but difficult to measure.
  • Global insect biomass is reportedly declining, necessitating effective monitoring methods.
  • Accurate biomass assessment is vital for understanding ecological dynamics and conservation.

Purpose of the Study:

  • To evaluate the accuracy of forewing length as a predictor of body mass in Neotropical Ichneumonidae.
  • To provide a practical method for estimating insect biomass, particularly for museum specimens.
  • To support global insect biomass monitoring initiatives.

Main Methods:

  • Measured forewing length and dry body mass in 728 Neotropical Ichneumonidae specimens.
  • Established a log-linear regression model to correlate wing length with body mass.
  • Utilized exponential transformation to derive final mass predictions from the model.

Main Results:

  • A significant and strong log-linear relationship was found between forewing length and dry body mass.
  • The developed regression model demonstrated high predictive power for estimating insect mass.
  • An R function was created for predicting mass using wing length.

Conclusions:

  • Forewing length is an accurate and practical estimator of body mass for Neotropical Ichneumonidae.
  • This method facilitates biomass estimation, especially for dry-preserved insect collections.
  • The findings contribute to improved insect biomass monitoring and ecological assessments.