Review primary succession and discuss secondary succession from soil to climax community trees. Introduce aquatic succession from lake or pond to terrestrial habitat. Examine factors which influence specie richness. Elicit the effect of colonization, speciation, and extinction. Discuss the effect of latitude, time,habitat, and distance. Answer module 21 review questions

Discuss/review species richness and the importance to the survival of the species in a habitat. Discuss the basic methods of affecting species richness, colonization, speciation, and extinction rate. Explain how latitude, time, habitat size and island distance from a mainland will change the species richness of a niche

lesson outline is written on Monday's summary

Define ecological succession and stress that it may take centuries to accomplish.
Introduce primary succession, from bare rock to mid succession plants. Examine how algae dissolve rock to obtain minerals and then convert the rock to soil when they decompose. Discuss how the thin layer of poor soil becomes hospitable for plant life. Indicate how new species colonize the area and outcompete the mid succession plants by adapting to temp. and rainfall.
Introduce and discuss secondary succession, which starts from soil and not rock. Explain how trees replace grasses and wildflowers and become the pioneer species. Lead from pioneer species to climax community due to rain and temperature and shade provided,

outline and discuss primary succession from bare rock to mid succession species. Discuss and view algae, moss, and lichens.
Discuss how new species then colonize the area and outcompete mid succession plant species.

Discuss speciation and the pace of evolution. This will include a discussion of allopatric and sympatric speciation. Examine how allopatric occurs with geographic isolation, and the causes of geographic isolation. Indicate how natural selection will favor different adaptations on each side of the geographic isolation, resulting in a new specie.
Compare it to sympatric speciation, which results from polyploidy and the ability of only those organisms exhibiting the extra chromosmes will produce viable offspring, creating a new species.

Examine speciation, some causes, and the pace evolution. Discuss allopathic and sympathic speciation. Examine how allopathic occurs and the role natural selection plays. Use images to display new species are formed by these methods. Define sympathic speciation, explain how it occurs due to changes in the number of chromosomes present in some gametes, called polyploidy. Discuss how this results in the formation of a new species.

Discuss mutations, recombination, natural selection, artificial selection, and random selection. Show how each affects genetic diversity and the species ability to survive.

Discuss ways in which evolution affects diversity. Introduce evolution through natural selection, the Darwin theory. Examine how adaptation improves fitness and the ability to survive. Compare artificial selection and define. Examine evolution through randomness. Include mutation, gene flow, genetic drift and bottleneck effect.

Use a series of written question to discuss, explain and show examples of the cause and effect of inbreeding depression. All terms used are defined along with examples. Elicit a conclusion that inbreeding creates low genetic diversity which leads to deleterious alleles being inherited and deleterious mutations. Review phenotype and genotype and how the genotype willl affect the phenotype