BIOL 215 Lecture Notes - Lecture 10: Krakatoa, Allogenic Succession, Seral Community
13 Oct 2016
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Lecture 10: behavioral ecology 4/ population ecology 1. Nepetalactone deters cockroaches, beetles, interferes with moulting. Attracts lacewings which consume aphids: psychotropic effects- peyote (mescaline. Animal defenses against plant chemical defenses: mixed function oxidase- oxidation, reduction, hydrolysis, concentrations of toxins- poison dart frogs have poisonous mucus that can kill in seconds if touched. Red tide is because the clams concentrate the toxins in a part of their body: selective browsing- worm eats parts of a leaf without breaking the vessels that secrete toxins. Ecological succession: the sequential change is species composition of the community over time: primary succession: initial establishment of plant and animal communities on substrates lacking living organisms (ex. Bare rock, lava, sand dunes, glacial melt water, pond, rainwater) Alder trees can grow on rock or crumbled rock because it has nitrogen fixing bacteria, these trees eventually get replaced by western hemlock: secondary succession: change of an established community. Ponds and lakes accumulate sediment, pollen, leaves (low decomposition).
