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Nutritional and chemical composition of different life stages of Tribolium castaneum (Herbst)
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Orientador(es)
Resumo(s)
Tribolium castaneum can survive in extremely dry environments and be one of the major insect pests of broken
and processed grains or other stored dried foods. Additionally, this species has demonstrated resistance to some
classes of insecticides. The objective of this work was to evaluate the nutritional and chemical composition of
T. castaneum, reared on maize flour, and compare protein, lipids and fatty acids profile, amino acids and mineral
contents, of different developmental stages: larvae, pupae and adults. In general all stages were rich in protein
(15.3% for larvae and 17.0% for adults, wet body weight).
Disparities among developmental stages regarding amino acids and fatty acids content were found. Essential
amino acids were most abundant in T. castaneum; a different essential amino acid was prevalent on each
developmental stage: larvae - valine; pupae - lysine; adults - histidine. Tribolium castaneum is rich in phosphorus,
potassium and sulphur; larvae had a significantly higher content of phosphorus, potassium, sulphur and zinc,
while adults showed significantly lower content of potassium and zinc. Larvae and pupae showed higher values
of SFA (heptadecanoic and stearic acid) and PUFA (α-linolenic and linolenic acids), while MUFA showed the
reverse tendency, with adults having the highest contents of hypogeic, palmitoleic and oleic acids. The nutritional
differences among different developmental stages identified are due to specificities of each stage (level of
chitinization, motility, energy requirements and food intake habits), as the diet offered to the insects was the
same. This study can thus be considered a first step towards future directions of investigation, to a better understanding
of this pest nutritional preferences and alternatives to achieve a more sustainable management of
infested stored products
Descrição
Palavras-chave
stored products insect pest Tribolium castaneum maize flour nutritional analyses developmental stage
Contexto Educativo
Citação
Journal of Stored Products Research 93 (2021) 101826
Editora
Elsevier