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Alberta Biology 30: Population and Community Dynamics - Q & A

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Alberta Biology 30: Population and Community Dynamics - Q & A What is succession? What is it a result of? sequential change in populations over time in a given area; result of interspecific competit ... ion and Gause's Principle What is a pioneer species? the first species to colonize an area and initiate succession What is species replacement? result of interspecific competition; environment becomes more suitable for next species to take over (more water, more shade, etc); grasses, shrubs, deciduous trees. What is a climax community? latecomers in process of succession; remain relatively stable if no major changes to environment How is primary succession different from secondary succession? Primary begins with naked rock (result of volcano for example), and secondary succession begins with soil (result of fire for example) What is environmental resistance? Give three examples. factors from the environment that lead to decreased natality, increased mortality and emigration. Examples: limited space, predators, disease, limited resources What is carrying capacity? What is the symbol for it? the theoretical maximum population size that the environment can sustain in the long term; symbol = K What is biotic potential? maximum reproductive capacity of a species if resources were unlimited Which two strategies affect the biotic potential of a population? r-selection and K-selection Give the eight characteristics of a r-selection strategy of a population. take advantage of favourable conditions to reproduce quickly; J-shaped; found in unstable environments; short life spans; short gestation; rarely nurture offspring; offspring is small; clutch is large Give the eight characteristics of a K-selection strategy of a population. more likely to be endangered; S-shaped; found is stable environments; long life spans; long gestation; nurture offspring; offspring is large; fewer offspring per birth. [Show More]

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