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Chapter 25 (structure of population (limiting factor # (applies to all…
Chapter 25
structure of population
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water, light, carbon dioxide temperature, animal pollination, soil
random distribution= no obvious, identifiable pattern to the position of individuals
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uniform distributions = orchards and tree plantations, all evenly spaced from neighbors
demography
relative proportions of young, middle aged, and old individuals
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r- selection
r- selected species = annuals or small shrubby perennials because the disturbed habitat gradually changes back into a crowded one
K- selection
K-selected species= habitat that is very crowded, much slower than r- selection
structure of ecosystems
physiognomic structure= physical size and shape of the organisms and their distribution in relation to each other
trees, shrubs, and herbs are most useful
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species composition= number and diversity of species that coexist in an ecosystem, and depends on if climate is mild or stressful, soil is rich or poor, and tolerance ranges are broad or narrow
trophic levels= feeding levels; photosynthesis is dominant #
autotrophs are primary producers, first step of any food web. energy and nutrient supplier
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