Population Biology Vocabulary List Population Density Age Structure

Population Biology!

Vocabulary List • Population Density • Age Structure • Immigration • Emigration • Growth Rate • Exponential Growth • Logistic Growth • Carrying Capacity • Intraspecies Competition • Interspecies Competition Helpful terms you’ll know by the end of our lesson! Hint: They’re also defined in your textbook on page 130 - 136

Why Does Age Matter? Age Structure – the number of females and males of each age a population contains. So, why would this matter?

Immigration Vs. Emigration Immigration Individuals moving into an environment from elsewhere How does this affect the local population? Emigration Individuals moving out of an environment How does this affect the local population?

Exponential vs. Logistic Growth Resources are Unlimited Resources have a Limit

Carrying Capacity • The maximum population size of the species that the environment can sustain, given the food, habitat, water, and other resources available in the environment. • Once a population reaches Carrying Capacity, a variety of factors act to stabilize it at that size!

Can you tell me where the Carrying Capacity begins to influence this growth curve? http: //www. geocities. com/Rain. Forest/Watershed/4345/pictures/growth_curve. jpg

Steady State

Consider a community with a lynx predator and a rabbit prey • Which growth curve will follow the other in a predatory prey relationship?

When prey are numerous their predators increase in numbers, reducing the prey population, which in turn causes predator number to decline. http: //www. bbc. co. uk/schools/gcsebitesize/science/images/bilynxandhare. gif

Competition Intraspecies Competition within the same species Interspecies Competition between different species Name the type of competition on the following slides!

Limiting Factors Control Population Growth Population Density The number of individuals per unit area. Density Dependent Factors whose effects on the size or growth of the population vary with the population density. BRAINSTORM What are some examples? Density Independent Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population. BRAINSTORM What are some examples?