Chapter 13

Chapter 13 - 5) Population Size: number of individuals in...

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Chapter 13 1) Ecology: the study of living things interacting with their environment 2) Biotic community 3) Abiotic factors: things that are not living, yet still effect the community (Ex.: climate, soil, etc.) a) Organization i) Organism ii) Species: one type of organism iii) Population: all members of the same species in a given area that potentially can interbreed iv) Community: interactions between all types of living things in an area v) Ecosystem: the combination of biotic and abiotic factors interacting vi) Biosphere: the entire world 4) Population Structure a) Distribution: describes the location (physical spacing) in an area i) Clumped: because resources are only found in specific area
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ii) Uniform: organisms spread out evenly in area; resources available throughout area iii) Random: rare, no reasons to clump or spread; unlimited resources b) Density: the number of individuals per acre i) High density: crowded ii) Low density: sparsely populated
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Unformatted text preview: 5) Population Size: number of individuals in the total population a) Growth Rate= Birth Rate – Death Rte i) Death Rate Factors (1) Disease (2) Famine (limited resources) ii) Birth Rate Factors (1) Number of offspring/ litter (births) (2) Length of gestation (3) Life expectancy b) Exponential Growth: birth rate higher than death rate (J-Curve) i) Unlimited resources ii) No predation iii) No wastes/ pollutants c) Biotic Potential: maximum number of offspring VS. Environmental Resistance: limits the biotic offspring i) Carrying capacity: maximum number of organisms (one species) an area can support indefinitely (resources available) (S-Curve) ii) ER Factors (increases death rate) (1) Density-Dependent (Ex.: limited food): the higher the population, the higher the death rate (2) Density-Independent (Ex.: weather): the death rate does not increase with population size...
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This note was uploaded on 07/07/2008 for the course BIOL 115 taught by Professor Behrens during the Spring '07 term at Towson.

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Chapter 13 - 5) Population Size: number of individuals in...

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