BIOLOGY 1M03 Lecture Notes - Lecture 1: Autotroph, Primary Production, Intermediate Disturbance Hypothesis
11 Dec 2015
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Secondary succession: gradual invasion of species from surrounding communities following a disturbances (including human habitat distrubances: e. g. when farmer stops plowing and weeds come in. Rate of immigration will be low if it"s a small island: high extinction as small island has lower amount of resources. Macarthur and wilson established island biogeography theory. Suggested a balance of immigration and extinction leading to equilibrium levels of species richness (number of different species) on islands: e. g. how many lizards are living on this island. Lost all life during catastrophic eruptions in 1883 devoid of life, Plants and animals showered down as aerial plankton delivered by storms swim, fly) early on. Next groups arrived strong dispersers first (e. g. species that. Rate of arrival diminishes because strong dispersers established. As island became crowded, extinction became more common as more and more species contend for space and resources. Species richness depends on the number of existing species.
