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Science Chapter 3,4

Biology, Vocabulary

QuestionAnswer
Climax Community a stable mature community that goes under little or no change in species over time
Limiting Factor any biotic or abiotic factor that restricts the existence, number, reproduction, or distribution or organisms
Secondary Successsion sequence of changes that take place after a community is disrupted by natural disasters or human actions
Primary Succession colonization of barren land by pioneer organisms
tolerance the ability of an organism to with stand fluctuations in biotic and abiotic environmental factors
Biome a major ecological community type
Grassland biome composed of large communities covered with rich soil, grasses, and similar small plants, receives 25-75 centimeters pf percipitation
Desert arid region with sparse to almost nonexistent plant life; driest biome, usually recieves less than 25 cm of percipitiation
Carrying Capacity number of organisms of one species that an environment can support
Density-dependent Factor limiting factors such as disease, parasites, or food ability that affects growth of a population
Density-independent Factor factor such as temperature, storms, floods, drought, or habitat disruption that affects all populations, regardless of their density
Exponential Growth growth pattern where a population grows faster as it increases in size; graph of an exponentially growing population resembles a J-curve
Life-history pattern an organism's pattern of reproduction; may be rapid or slow
Age Structure proportions of a population that are at different age levels
Birthrate number of live births per 1000 population in a given year
Death Rate number of deaths per 1000 population in a given year
natality the ratio of the number of birthrates to the size of the population
Moraility the state of being subject to death
Demography study of population characteristics such as a growth rate, age structure and geographic distribution
Doubling Time time needed for a population to double in size
Created by: Josie!
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