html5-img
1 / 14

Ecology: Parts of an Ecosystem Population Dynamics

Ecology: Parts of an Ecosystem Population Dynamics. Ecology. What is it? Study of how organisms INTERACT with living and non-living things. What will we be looking at?. Parts of an ecosystem Things that affect pop’n size Roles and relationships in an ecosystem Energy flow in an ecosystem

cassie
Download Presentation

Ecology: Parts of an Ecosystem Population Dynamics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ecology:Parts of an EcosystemPopulation Dynamics

  2. Ecology What is it? • Study of how organisms INTERACT with living and non-living things

  3. What will we be looking at? • Parts of an ecosystem • Things that affect pop’n size • Roles and relationships in an ecosystem • Energy flow in an ecosystem • Importance of biodiversity • Succession • Human impacts on the environment

  4. What makes up an ecosystem? • ECOSYSTEMS – BRAIN POP!! BIOTIC FACTORS • “Bio” means living • Living things in an ecosystem • Can you list the living things that live in this ecosystem? • Frogs, insects, fish, hawks, grasses, bacteria, amoeba etc……..

  5. What makes up an ecosystem? • ABIOTIC FACTORS • When you put “a” in front of a word it negates it • Means “non-living” factors • Can you list some non-living factors that affect the pond ecosystem? • Water, light, temp, acidity, oxygen and nitrogen levels

  6. Organization of Life • BIOSPHERE • HABITAT • ECOSYSTEM • COMMUNITY • POPULATION Decreasing amount of biotic and abiotic factors

  7. Population Growth Brain Pop Video

  8. What affects pop’n sizes in an ecosystem? • COMPETITION! • Struggle for resources among organisms • If no competition, pop’ns would grow INFINITELY (no limit!) • Competition maintains FINITE (limited) pop’n sizes • Finite popn’s limited by LIMITING FACTORS • CAN BE ABIOTIC OR BIOTIC

  9. Comparing Finite and Infinite Pop’ns INFINTITE GROWTH FINITE GROWTH

  10. What affects pop’n sizes in an ecosystem? • ABIOTIC LIMITING FACTORS • Amount and intensity of sunlight • Amount of water • Amount of dissolved oxygen (lakes, rivers, etc) • Acid level • Temperature range • Minerals available

  11. What affects pop’n sizes in an ecosystem? • BIOTIC LIMITING FACTORS • Predator/Prey relationships • Predators limit prey pop’n sizes by eating them • Prey limit predator pop’n sizes by dying/being killed • If too many killed, predators starve • Adapting (survival of fittest)

  12. What affects pop’n sizes in an ecosystem? Effects of Predator/Prey Relationship As you can see, AS PREY POP’N DECREASES, THE PREDATOR’S POP’N DECREASES

  13. What do we call it when a species reaches its limit? • EVERY pop’n in an ecosystem has a CARRYING CAPACITY (K) • The # of orgs of a single species an ecosystem can support • Determined by biotic and abiotic factors • EX: a fox pop’n is affected by how much it has to eat (biotic) and also temperature (abiotic) • Once K is reached, pop’n will remain stable unless major changes in biotic and abiotic factors

  14. Carrying Capacity (K)of a Stable Pop’n • This graph shows the Carrying Capacity (K) of an organism • THIS SHOWS A STABLE POP’N • SLOWLY INCREASING TO K AND THEN DECREASING ONCE IT HITS K AND BACK UP AGAIN

More Related