Lecture3 - Lecture3:Organism/Organism Interactions Dr....

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Dr. Paula Lemons BIOL 1104 Lecture 3: Organism/Organism  Interactions
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Lecture Objectives Describe allopatric speciation. Begin and continue to practice applying your knowledge of evolution, natural selection, systematics, and speciation to new situations. Identify, explain, give examples type of interaction between organisms (mutualism, competition, parasitism, herbivory, predation, commensalism) Be familiar with/ be able to identify these interactions in new environments Distinguish/ infer resources (nutrients, water, light) and services (pollination, transfer of nutrients, habitat) gained or lost via the interaction Interpret data to deduce the relationship between organisms in familiar (for example plant competition) and novel situations Understand ecology as interwoven in other aspects of biology
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Big Questions Who are the organisms? How did all of the organisms get here Why care?
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The Tree of Life One huge phylogenetic tree. http://tolweb.org/tr ee/ Who are the organisms?
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w did all of the organisms get here?
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Branching Evolution Figure 14.1 =Speciation
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Biological Species Concept A species is a group of organisms that can interbreed to produce viable, fertile offspring. Using the biological species concept, speciation happens when the exchange of genetic information (of DNA) between populations is reduced or eliminated. We say that the populations have become reproductively isolated from each other.
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Reproductive  barriers  between closely  related species Figure 14.3
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Speciation may occur when  populations are geographically  isolated Allopatric Speciation
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Mantellinae (Madagascar only): 100 species
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This note was uploaded on 09/06/2011 for the course BIOL 1104 taught by Professor Stanger-hall during the Spring '08 term at University of Georgia Athens.

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Lecture3 - Lecture3:Organism/Organism Interactions Dr....

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