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Carrying Capacity Notes Population Density is the measurement of a population per unit area. Populations are often measured in organisms per mile or organisms per acre. For example, deer populations might be 250 deer/mile. Healthy populations must maintain a certain population density. Too low of a population density can lead to an extinction vortex where difficulties can lead to species extinction. Problems which lead to this are 1. Difficulties finding a mate 2. Inbreeding which weakens the species Too high of a population density can threaten the ecosystem’s carrying capacity. Carrying Capacity is the population size of a species that an environment can sustain for a long period of time. Sometimes a population exceeds the carrying capacity When the population is too large for an extended period of time, the following will occur: Large number of the population will die Environment and resources are damaged Environmental carrying capacity shrinks An environment’s carrying capacity is determined by Limiting Factors. Limiting factors can be biotic or abiotic.