Feeding and Siblicidal Cannibalism in A Male Parasitic Wasp (Hymenoptera: Eulophidae)

Authors

  • Leif D. Deyrup
  • Robert W. Matthews
  • Mark Deyrup

Abstract

Melittobia digitata Dahms is a small parasitic wasp known for its lethal male combat but subject to controversy regarding the occurrence of male feeding and cannibalistic feeding in particular. Here we report our observations supporting siblicidal cannibalism. To test the ability of a male's capability to feed we smeared sugary dye on the wasps' mouthparts and observed the dye passing through the digestive system to produce colored feces, confirming that males have a complete digestive tract. To document siblicidal feeding we injected other males with water-soluble dye, and paired them with undyed males. Undyed winners that appeared to feed on dyed losers were monitored; dye was evident in their feces. Finally, to determine if males benefit from feeding, we compared the longevity of artificially fed and unfed males; fed males lived significantly longer than non-fed males (Mann-Whitney U test = 81.5, N1 = 26, N2 = 26, P < 0.001). We discuss possible reasons for the comparative rarity of siblicidal cannibalism and its fitness implications.

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Published

2006-06-01

Issue

Vol. 89, No. 2 (June 2006)

Section

Literature Review Articles

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