PCB 4043 Lecture Notes - Lecture 12: Mescaline, Histamine, Parasitism
Document Summary
Secondary compounds chemicals produced by plants that either reduce the ability of herbivores to digest plant tissue or deter herbivores from feeding. Phenolics (aromatic compounds and include tannins and lignin. Quantitative inhibitors secondary compounds produced by the plant in large quantities and reduce digestibility. Tannins and resins may constitute up to 60 percent of the dry weight of the leaf. 5 to 35 percent of the carbon in the leaves is in the form of lignin. Qualitative inhibitors secondary compounds present in small to minute quantities and function as defenses against herbivory. Most specialize on one type of host. Microparasites small size and a short generation time. Macroparasites large with a comparatively long generation time and usually involve intermediate hosts and carriers. Ectoparasites live on the host"s skin within the protective cover of feathers and hair. Endoparasites live within the host (beneath the skin, bloodstream, gills of fish, mouthparts)
