2. Populations Gaiser Life Science

3. Know What causes the size of a population to change? Evidence Page # “I don’t know anything.” is not an acceptable answer. Use complete sentences. After listening to the PowerPoint lecture, come back here and list evidence to explain why your answer to the above question is or is not a good answer. You may also use other outside sources to help you respond. Draw pictures to show all five ways a population can change.

4. Clarifying ?s Information Page # population density - the number of individuals in a specific area Populations How determined? (4 ways) - Count all members of a species. Examples: How many people in a classroom 2. indirect observation - Count the tracks in the snow or the number of nests or burrows. Example: This is often an estimation 3. sampling - a count in a smaller area is mathematically expanded to include a larger area Example: 2 lizards per square meter becomes 20 lizards per 10 square meters 4. mark & recaptureCapture organisms, mark or tag them, release them, & capture others. 1. direct observation Example: catch & mark ten lizards and release them. Catch ten unmarked lizards. The total number of lizards is 20.

5. Clarifying ?s Information Page # Populations immigration- new species from another group join the group emigration- species from one group leave and join another group. 3. limiting factors- the environment controls the population 4. carrying capacity- the largest number that an area can support Summary: Examples: weather, food, space Population change (5 ways) - number of births per year1. birth rate - number of deaths per year2. death rate 5. adaptations- characteristics that help species survive Examples: protective cover, mimicry, warning colors, night vision, sonar, hearing, poison

7. Clarifying ?s Information Page # Populations population density - the number of individuals in a specific area How determined? (4 ways) - Count all members of a species. Examples: How many people in a classroom 2. indirect observation - Count the tracks in the snow or the number of nests or burrows. Example: This is often an estimation 3. sampling - a count in a smaller area is mathematically expanded to include a larger area Example: 2 lizards per square meter becomes 20 lizards per 10 square meters 4. mark & recaptureCapture organisms, mark or tag them, release them, & capture others. 1. direct observation Example: catch & mark ten lizards and release them. Catch ten unmarked lizards. The total number of lizards is 20.

8. Clarifying ?s Information Page # Summary: Populations immigration- new species from another group join the group emigration- species from one group leave and join another group. 3. limiting factors- the environment controls the population 4. carrying capacity- the largest number that an area can support Examples: weather, food, space Population change (5 ways) - number of births per year1. birth rate - number of deaths per year2. death rate 5. adaptations- characteristics that help species survive Examples: protective cover, mimicry, warning colors, night vision, sonar, hearing, poison

9. This PowerPoint was created by Tim Paterek from Charlene Shea’s lecture notes. All pictures came from Google Image Search. To fall within the Fair Use Guidelines, this PowerPoint must be used within the confines of the classroom and may not be published back onto the Internet unless the pictures are removed.