Stable equilibrium gEE Lag Time A Typical Population Growth Curve In this mouse population, there is little growth during the lag phase. During the exponential growth phase, the population rises rapidly as increasing numbers of individuals reach reproductive age. Eventually, the population reaches a stable equilibrium phase, during which the birthrate equals the death rate
A Typical Population Growth Curve A Typical Population Growth Curve In this mouse population, there is little growth during the lag phase. During the exponential growth phase, the population rises rapidly as increasing numbers of individuals reach reproductive age. Eventually, the population reaches a stable equilibrium phase, during which the birthrate equals the death rate
Carrying Capacity Carrying Capacity-Number of individuals of a species that can be indefinitely sustained in a given area Environmental resistance-The combination of factors that sets the carrying capacity for an area. Four main factors Raw material availability Energy availability Waste accumulation and disposal Organism interaction
Carrying Capacity • Carrying Capacity - Number of individuals of a species that can be indefinitely sustained in a given area. • Environmental Resistance – The combination of factors that sets the carrying capacity for an area. Four main factors: – Raw material availability – Energy availability – Waste accumulation and disposal – Organism interaction
Environmental resistance 283 Carrying Capacity A number of factors in the environment. such Carrying capacity as oxygen supply, food supply, diseases, predators, and space determine the number of organisms that can survive in a given area the carrying capacity of that area. The environmental factors that limit populations are known collectively as environmental resistance
Carrying Capacity Carrying Capacity A number of factors in the environment, such as oxygen supply, food supply, diseases, predators, and space, determine the number of organisms that can survive in a given area – the carrying capacity of that area. The environmental factors that limit populations are known collectively as environmental resistance
Number of bacteria =xponential Death 02468101214161820404244 A Bacterial Growth Curve The initial change in population size follows a typical population growth curve until waste products become lethal. The buildup of waste products lowers the carrying capacity When a population begins to decline, it enters the death phase
A Bacterial Growth Curve A Bacterial Growth Curve The initial change in population size follows a typical population growth curve until waste products become lethal. The buildup of waste products lowers the carrying capacity. When a population begins to decline, it enters the death phase
150 Varying hare o Canada lynx s125 100 75 50 25 八 850 18601870188018901900191019201930 Year Interaction of Predator-Prey Population Interaction between predator and prey species is complex and often difficult to interpret. These data show that the two populations fluctuate with about 10 years between successive high populations. The change in the lynx population usually followed changes in the varying hare population
Interaction of Predator Interaction of Predator-Prey Population Prey Population Interaction between predator and prey species is complex and often difficult to interpret. These data show that the two populations fluctuate with about 10 years between successive high populations. The change in the lynx population usually followed changes in the varying hare population