Introduction to Ecology
Introduction to Ecology EVE 101
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This 1 page Class Notes was uploaded by Raven Connelly on Tuesday September 8, 2015. The Class Notes belongs to EVE 101 at University of California - Davis taught by Staff in Fall. Since its upload, it has received 25 views. For similar materials see /class/187322/eve-101-university-of-california-davis in Evolution And Ecology at University of California - Davis.
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Date Created: 09/08/15
EVE 101 7 W08 Lecturel7 Handout p 1 Summary Biological Diversity Ecological factors in uencing speciation coexistence and extinction These are some generalizations that may have exceptions from various units in the class This summary will allow you to 1 review for the final and 2 apply principles to conservation and management of species and ecosystems Unit on sin le s ecies 0 ulation rowth 1 Allee effect reverse density dependence with extinction threshold H39 x 1 31 tuxl extinction K threshold 2 Inappropriate reproductive strategies ie r selected species are preadapted to dealing with human disturbance and harvesting but often K selected species are not Unit on population interactions Predation including herbivory and parasitism 1 Predator prey interactions have a natural tendency to cycle Cycles of large enough amplitude can lead to local extinction The greater the degree of regulation the larger cycles can be 2 Predators can allow more potential competitors to coexist when predators regulate prey hold them below K Predation thereby allows higher species diversity at lower trophic levels Hairston Smith amp Slobodkin 1960 3 Predator prey coevolution leads to specialization that might enhance the rate of speciation through simple allopatric speciation or in interaction with competition below Parasite host coevolution may include the phenomenon of cospeciation 4 Predator or prey evolution not necessarily coevolution might lead to global extinctions as new innovations make older strategies of predator or prey obsolete new innovations may lead in turn to major adaptive radiations of new species
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