BIOL 215 Lecture Notes - Lecture 1: Defense In Insects, Defence Mechanisms, Herbivore
15 Jan 2015
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Announcements: assignment 2 will be posted on friday at 17:00, submit your answers through webtc, as you did for assignment 1, due at 11. 59pm, november 7. Summary: herbivory and mutualism, communities: assemblage of populations that live together in the same habitat. Herbivory: a herbivore consumes its prey but does not always kill it. Plants produce such a variety of secondary metabolites because there are a large variety of herbivores. Resource availability hypothesis: plants naturally vary in their growth rates. Alternate interpretation: defence is actually costly, the more a plant invests into defence the less energy it will invest into growth. It is a trade-off, allocating more energy to defence leaves less energy for growth. Defence can be divided into constitutive defence (always present and continuously produced) and induced defences (produced in response): constitutive defence. These plants also always produce a secondary metabolite. : pountia cactus in the anza-borrega desert, california.
