Jose Roberto Trigo

• Abstract

  Sequestration of chemical defenses from host plants is a strategy widely used by herbivorous insects to avoid predation. Larvae of the arctiine moth Utetheisa ornatrix feeding on unripe seeds and leaves of many species of Crotalaria (Leguminosae) sequester N-oxides of pyrrolizidine alkaloids (PAs) from these host plants, and transfer them to adults through the pupal stage. PAs confer prot…

  Feeding on host plants with different concentrations and structures of pyrrolizidine alkaloids impacts the chemical-defense effectiveness of a specialist herbivore, PUB.ART

• Abstract

  Plants and herbivores have been shaped by strong selective pressures exerted by their natural enemies, which may be responsible for the development of a vast array of defenses in these organisms. To compensate their immobility plants have evolved particular strategies to defend themselves against these enemies. Many kinds of plant defenses are common in nature, as physical (such as non gl…

  Chemical defense in plants and insects in neotropical environments, AP.R

• Abstract

  Plants respond to insect herbivory by producing toxic substances (direct defense) or by releasing volatile compounds that attract natural enemies of herbivores (indirect defense). The optimal defense theory of plants predicts that defense costs are proportional to the resource investments and toxic substances should be allocated to more valuable plant tissues. In addition, change in resi…

  Tropane alkaloids of Brugmansia suaveolens: effect in the trophic interactrion with specialist and generalist herbivores and their natural enemies, AP.R

(Only some records are available in English at this moment)

• Abstract

  Phytophagous insects can be monophagous when concerning their host plants, often completing their larval development in plants of a single genus or even of a single species. Monophagy is found in Lepidoptera and it can be mediated by secondary compounds present in the larvae's host plant. Battuspolydamas (Papilionidae: Papilioninae: Troidini) butterfly's larvae are monophagous, feeding on…

  Performance of battuspolydamas (Papilionidae: Papilioninae: Troidini) butterfly's larvae in their host plants: the effect of leaf age and of the species of the host plant, BP.IC
• Multitrophic interactions among Crotalaria - Utetheisa ornatrix - natural enemies: an geographic mosaic approach, BP.PD

• Abstract

  Plants use many defensive strategies to minimize the impact of natural enemies on them. Otherwise, herbivores can overcome such defenses. When plants use chemical defenses, in some cases, herbivores are able to sequester these defensive compounds and use them to own defense against predators and parasitoids. Studies that take in account this multiple approach would be more successful t…

  Multimodal defenses in Ipomoea carnea subsp. fistulosa (Convolvulaceae) and in their herbivores, the tortoise beetles (Chrysomelidae), BP.DR

(Only some records are available in English at this moment)