Population Density Mrs. Harper 3/18/18 Biology

March 18, 2018 Begin working on Do Now FRESH START, LET’S HAVE AN AWESOME LAST QUARTER!!!

Do Now 1/5/16 1. Name one enjoyable thing that you did over Spring Break? 2. How do you feel you did on your Genetics exam? What did you do to prepare? 3. 4th Quarter is a fresh start, what grade do you hope to achieve for this new quarter? 4. What is something you hope to do differently from last quarter to ensure you reach your goal? What behaviors are you going to change or continue? 5. What unit are you most looking forward to in quarter 4? Ecology or Evolution? Why?

STRONG START! Be focused every day Be attentive and listening Follow instructions Keep up with assignments (minimize late/missing work) Self advocacy skills (seek out help when needed)

UNIT 5: Flow of Energy and Matter Question: What is a population?

What is “Population Density”? Population density is the number of individuals of the same species living in a given area. Example: Number of deer that live near a certain lake

Factors Affecting Population Density Relationships among organisms (Mating, Predator/Prey, Competition) Movement of individuals into and out of an area Climate

What is a niche? Every population in a community occupies a unique niche or job. A niche is an organism’s role in its environment. Includes its interactions with other organisms and with the non-living environment

Abiotic vs. Biotic Factors Abiotic factors- non-living things that affect and organism Biotic factors- living things in an environment and their effects on the organism

Abiotic Factors (Non-living) Sunlight Water Soil Temperature Living Space

Biotic Factors Food Disease Predation Symbiotic relationships Availability of mates

Do Now 3/18/18 1. Define abiotic factor and give an example. 2. Define biotic factor and give an example. 3. What is population density? Provide an example. 4. What is a niche? Provide an example. 5. What are the three factors affecting population density? 6. Is sunlight an abiotic or biotic factor, why? 7. Is food an abiotic or biotic factor, why?

How do populations increase or decrease? Number of births Number of deaths Movement into and out of an area, known as immigration and emigration.

Exponential Growth Under ideal conditions, with unlimited resources and space, a population will experience exponential growth.

Limiting Factors in a Population Food Water Oxygen Sunlight Predators Living Space Disease

Density-Dependent Limiting Factors Density-dependent limiting factors have more of an affect on larger or more crowded populations and includes: Competition Predation Parasitism Living Space

Check for Understanding If a population is very large, will it have more or less competition among its organisms? How do you know?

Density-Independent Limiting Factors Density-independent factors affects both large and small populations in crowded or uncrowded conditions. Includes severe climate change and geological events like: Volcanic eruptions Drought Earthquakes Flooding

Example Volcanic eruption of Mount St. Helens destroyed about 500 square kilometers of forest. If enough survive, the species may be able to recover and survive.

Quick Check What is happening to the population in this graph? It is increasing, decreasing or staying the same? What could be causing this change?

Video (if time) https://www.youtube.com/watch?v=BSVbdaubxxg 2 min 57 sec

Assignment Working silently and independently for on assignment Unfinished classwork will become homework