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topic 3

QuestionAnswer
What is a population? group of individuals of same species in one area
What is population ecology? study of factors affecting population size and changes
What is population density? number of individuals per unit area or volume
What are biotic factors? living components affecting populations
What are abiotic factors? nonliving environmental components
How can density be estimated? sampling small plots and extrapolating
What is dispersion? pattern of spacing among individuals
What is clumped dispersion? individuals in patches or groups
What is uniform dispersion? evenly spaced individuals
What is random dispersion? unpredictable spacing
What is demography? study of vital statistics and how they change over time
What is a life table? age-specific summary of survival
What is a survivorship curve? graph showing survival rate by age
What is a Type I survivorship curve? low early death, high late death (humans)
What is a Type II curve? constant death rate (squirrels)
What is a Type III curve? high early death, low later death (oysters)
What affects population size? births, deaths, immigration, emigration
What is the per capita rate of increase? birth rate minus death rate
What are limiting factors? conditions restricting population growth
What causes low population density in large animals? higher energy needs and space limits
What does high population density indicate? high resource availability
What does low population density indicate? resource limitation
What is carrying capacity? maximum population an environment can sustain
What influences carrying capacity? resource availability
What are density-dependent factors? competition, predation, disease
What are density-independent factors? weather, climate, disasters
What is population growth rate symbolized by? r
What does a positive r value indicate? population growth
What does a negative r value indicate? population decline
What is an age structure diagram? shows age distribution in a population
Created by: aayush123654
 

 



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