O growth or distribution of a species is dependent on

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o Growth or distribution of a species is dependent on the one environmental factor most critically in demand – Justus Von Liebig What is the “Theory of Tolerance”? o Each plant species is able to exist and reproduce only within a definite range of environmental conditions What is “Potential Habitat” and “Realized Habitat”? How do they differ? o Potential habitat: the range of environmental conditions that a plant can survive in and reproduce o Realized habitat: the habitat a species actually lives in because of competition in its potential habitat What is a good definition of “species”? What is the name for the most widely accepted species concept? o A species consists of groups of genetically, morphologically, and ecologically similar natural populations that may or may not be interbreeding but that are reproductively isolated from other such groups What is an “ecotype”? o A portion of the overall species that is adapted to a specific habitat or environment Describe the experiment that Clausen, Keck, and Hiesey conducted on Western Yarrow. What is an Ecocline? o A continuum in the variation of a species associated with an environmental gradient What is a “Niche”? o The n-dimensional hypervolume in defining the environmental limits within which organisms are able to reproduce and survive What is the “Competitive Exclusion Principle? o No two species can coexist permanently in the same niche Does the Niche concept apply to plants? Why or why not? o It depends: no because all plants require the same resources and there’s only 3 biochemical pathways for carbon acquisition so there’s not a lot of diversity however at the same time there is a lot of differences between certain plant species Succession (part 1) What is a good definition of plant community succession? o Directional change in community structure or species composition over time What is: Sere, Seral Stage, Pioneer Community, Seral Community, Climax Community? o Sere: a sequence of succession, from beginning to the ending state of minimal change o Seral Stage: each distinct community in the sequence
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o Pioneer Community: the initial seral stage o Seral Community: community exhibiting change towards the climax stage o Climax community: the endpoint community in a sere How is primary succession different from secondary succession? o Primary succession: succession on brand new land o Secondary succession: when it occurs on a landscape that was previously occupied What is “autogenic” succession? “Allogenic” succession? o Autogenic succession: caused by the influence of the plants themselves on the environment o Allogenic succession: caused by external forces not affected by the plants
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  • Spring '14
  • Plants, partner, Ecological succession, apical meristem

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