POPULATIONS Population: a particular section, group or type of animals living in an area or country.

Table of contents Slide 3 - Population Of Organisms Slide 4 - How Do Organisms In A Population Compete ? Slide 5 - Biotic Potential Slide 6 - What are intraspecies and interspecies competition ? Slide 7 - Density Slide 8 - Dependent and Independent Slide 9 – Questions

POPULATION OF ORGANISMS A population is a summation of all the organisms of the same species living in a geographic area.

How do organisms in a population compete ? Organisms compete for the resources they need to live- Air, Water, Food, and Space.

Biotic Potential The Biotic Potential of an organism is the ability of a population of living species to increase under ideal environmental conditions. There are 4 factors that affect Biotic Potential: Procreation- The number of times that a species reproduces each year. Length Of Reproductive Life- The age of sexual maturity and the number of years the individual can reproduce. Birth Potential- The maximum number of offspring per birth. Capacity for survival- The number of offspring that reach reproductive age.

What are intraspecies and interspecies competition Intraspecifc is when two of the some species fight over there same resources. For example: Two oak trees, that are growing side by side, therefore competing with one another so they get the same resources to survive. Interspecific is two or more species that fight over the same resources. Wolves and coyotes fight over the resources such as hare, water, and warmth.

Population Density Population Density- can be described as the number of organism living in a specific area at a certain time. For Example: Field with thousands of corn plants is much more densely populated than a field of the same size with on orchard of 40 fruit trees.

Dependent and Independent Factors of Population density Density dependent factors are most often biotic variables. Biotic variables are all of the living organisms within an ecosystem. When a population of organisms becomes too large, the individuals will suffer because there will not be enough resources for everyone. Independent Factors Both living and non-living things can influence the size of a population of organisms regardless of its size. For Example: It would not matter if there are 10 mosquitoes or 10 000, the cold weather would affect them all. This makes it a density-independent factor because population density does not matter.

Multiple choice 1.What are the four resource's organism need to live? A) Air, darkness, water and space. B) Mud, air, food and darkness. C)Air ,water ,food and space. D) Wind, water, fire and stone 2.Which is the definition for population? A) A particular section, group, or type of people or animals living in an area or country. B) Animals living with people all in the same area. C) A particular group mixed with human and animals spread through out the world. D) B and C

True & false The density of a population can be described as a number of organisms living in a specific area at a certain time. True or False? 2. The four sources for an organism competes for are Air, Water Shelter, and food. True or Fales?