GEV 4517 Lecture Notes - Lecture 13: Atelopus, Medical Investigation, Dengue Fever
1 Dec 2016
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Lecture 13: species interactions (continued) predation, herbivory, parasitism. Batesian: named after henry bates: mimicry of an unpalatable species (the model) by a palatable one (the mimic: ex: nonvenomous scarlet king snake models the venomous coral snake. Mullerian: named after fritz muller: many noxious species converge to look the same, reinforcing toxic design: ex: bees are almost all yellow and black. Monarchs and viceroy (mimic) converge to look the same. No one has done a comprehensive survey, but in insects; chemical defenses and aposematic coloration =51% Herbivory involves predation of plants and algae (plants have a variety of defenses against herbivores) Case study: a wide range of herbivores feed on plants; african acacia tree. It is armed with defensive spines, tough cuticles, and noxious chemicals. (the subject of this chapter, see table 14. 1. ) Mutualisms with defensive agents bull"s hor(cid:374) a(cid:272)a(cid:272)ia a(cid:374)d a(cid:374)ts. Mechanical defenses: first defense example acacia tree; thorns//trichomes: small sticky hairs that trap insects.
