EUROPEAN JOURNAL OF ENTOMOLOGY

Eur. J. Entomol. 100 (3): 329-335, 2003 | DOI: 10.14411/eje.2003.052

Larval omnivory in Amara aenea (Coleoptera: Carabidae)

Karel HŮRKA, Vojtěch JAROŠÍK

Department of Zoology, Charles University, Viničná 7, CZ-128 44 Praha 2, Czech Republic; e-mail: hurka@natur.cuni.cz

The duration of development, survivorship and adult size were compared for the larvae of Amara aenea reared in the first generation on pure diets of seeds (Stellaria media, Capsella bursa-pastoris, Tussilago farfara, Plantago major, Urtica dioica, or Potentilla argentela), or a pure diet of yellow mealworms (Tenebrio molitor larvae), and on a mixed diet of seeds and mealworm larvae (T. molitor, S. media and C. bursa-pastoris). To ascertain any long-term effects of pure diets, the beetles were reared on the same pure diet for several generations, or on different pure diets in different generations. The hypothesis that the larvae are primary omnivorous was tested. The evidence that the larvae of A. aenea are primary omnivorous was obtained by revealing that the larvae reared on the mixed diet of insects and seeds survived better, and developed faster in larger adults than those reared on the pure diets of seeds or insects. When the beetles were reared on the same pure diet for several generations, survivorship, and in most cases also the duration of development, did not change. However, when the beetles were reared on a different pure diet each generation, survivorship significantly decreased in successive generations.

Keywords: Carabids, Amara aenea, larval diet, life histories, seed predation

Received: July 26, 2002; Revised: September 19, 2002; Accepted: November 21, 2002; Published: September 15, 2003  Show citation