ecology for students part 1

ecology for students part 1 - 1 ECOLOGY (1) OIKOS: GREEK...

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ECOLOGY (1) OIKOS: GREEK WORD MEANING HOME (2) STUDY OF THE INTERACTIONS BETWEEN ORGANISMS AND THEIR ENVIRONMENTS *ABIOTIC *BIOTIC (3) DIFFERS FROM EVOLUTION IN *TIME SCALE *NATURE OF RESPONSE LEVELS OF ECOLOGICAL STUDY POPULATION: A group of interacting individuals of a single species. COMMUNITY: A group of interacting populations of different species ECOSYSTEM: Complete functional environmental unit including biotic and abiotic components I. POPULATION GROWTH * LIMITING RESOURCES * COMPETITION * PREDATION 1
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II. COMMUNITY ORGANIZATION *TROPHIC STRUCTURE *DIVERSITY III. ECOSYSTEM ORGANIZATION *ENERGY FLOW *NUTRIENT CYCLE 2
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POPULATION GROWTH: B > D. ....... POPULATION GROWS D > B. ....... POPULATION DECLINES r = intrinsic rate of natural increase = per capita rate of increase in population size = b - d per unit time/N N = number of individuals in the population 3
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LIMITING RESOURCE Eventually, populations run out of an essential resource = LIMITING RESOURCE =the resource in shortest supply Imposes a maximum population size that the environment can support = CARRYING CAPACITY (K) LOGISTIC GROWTH GRAPH -SHOW PATTERN OF LOGISTIC GROWTH -CARRYING CAPACITY 4
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EUTROPHICATION Limiting nutrients become highly concentrated in a body of water (pp. 1189-1191) *stimulates growth of photosynthetic organisms including algae = increased productivity *can cause dramatic changes in community
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This note was uploaded on 04/24/2008 for the course BIOL 103 taught by Professor Foster during the Fall '08 term at Clark University.

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ecology for students part 1 - 1 ECOLOGY (1) OIKOS: GREEK...

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