Populations of Organisms Page 106

Key Vocabulary Population – a group of individuals of the same species. Habitat- All biotic and abiotic factors in an area, where a species lives, feeds, reproduces. Niche - It’s HOW a species LIVES within a habitat

Population dispersion – the way the individuals of a population are spread out. Clumped dispersion - in groups Uniformed dispersion - spread out evenly Random dispersion – no order

Survivorship Curve Shows the population relationship between the survivors and organisms life span.

Type 1: low level infant mortality rate, most of the population survive until an old age. Ex: human

Type 2: Death rate is equal at all ages . Ex. Birds & small mammals

Type 3: High birth rate and high infant mortality rate Type 3: High birth rate and high infant mortality rate. Those that survive early years survive until old age. Ex. Fish, plants, amphibians, insects

Page 107 Draw 3 boxes that represent the three different dispersion methods. Draw a graph that represents the three different types of survivorship.

Population Changes The size of a population is always changing Page 108 The size of a population is always changing If resources are abundant, population size may increase. If resources are short in supply, population size may decrease.

Factors that effect the size of a population? Immigration – into another population Emigration- out of another population Births – making babies Deaths- predation, disease, starvation

How much Life can exist? Carrying Capacity- The maximum number of individuals an environment can sustain. Controlled by some limiting factor. Ex. Food, water, shelter, and space.

How do we count a population? Transect sampling  quadrant sampling