author unknownaddress unknownaccessed unknown

Organisms in the Environment

The Flow of Energy

Ecosystem Dynamics

Ecosystem Dynamics

A. Ecosystems

B. Population Growth

author unknownaddress unknownaccessed unknown

A. Ecosystems

1. The ecosystem is the habitat and the community considered together

a. temperature and humidity

b. oxygen, carbon dioxide, light, and water

c. predators, food, and mates_

author unknownaddress unknownaccessed unknown

Play

2. Organisms are adapted to their environment_

All Postershttp://www.allposters.com/-sp/A-Spiny-Tailed-Iguana-Climbs-a-Cardon-Cactus-on-San-Esteban-Island-Posters_i1244142_.htmaccessed 15.02.09

B. Population Growth

1. The growth of a population of organisms may be limited by environmental factors such as food supply or predation

a. population grows slowly

b. population grows exponentially

c. population growth decreases

d. population constant (carrying capacity)_

author unknownaddress unknownaccessed unknown

WHAT WOULD HAPPEN TO A POPULATION OF DEER LEFT ON AN ISLAND WITH NO PREDATORS?

Think about it!

Think

2. Population growth curves can vary with respect to one or more limiting environmental factors_

author unknownaddress unknownaccessed unknown

3. Weather can have dramatic effects on population size

a. temperature

b. availability of light

Not Rocket Sciencehttp://notexactlyrocketscience.wordpress.com/2006/08/31/aphids-get-superpowers-through-sex/accessed 15.02.09

author unknownaddress unknownaccessed unknown

Click

Biofilohttp://biofilo.wordpress.com/2007/02/04/protozoarios-i/accessed 15.02.09

4. Competition with other organisms can reduce the growth of a population

a. require same resources (light)

b. territory and mates

author unknownaddress unknownaccessed unknown

Click

5. Predation/starvation limits the size of a population

a. prey population becomes larger

b. easier for predators to find and kill prey

c. prey population decreases

d. predators find it difficult to find prey and die

e. cycle repeats_

OUT THEREhttp://outthere.freedomblogging.com/2007/07/accessed 15.02.09

author unknownaddress unknownaccessed unknown

Click

The End

The Flow of Energy

B. Energy Pyramids

A. Food Chains and Webs

Image and Lighthttp://www.imageandlight.net/d200_diary_month10.aspaccessed 15.02.09

A. Food Chains and Webs

1. The ultimate source of energy in an ecosystem is the sun

a. solar energy is transferred to chemical energy

b. this energy is passed along food chains

c. energy losses occur along a food chain_

author unknownaddress unknownaccessed unknown

PUT THE FOLLOWING ORGANISMS IN THE ORDER THEY ARE EATEN BY ONE ANOTHER: FROG, HAWK, GRASS, SNAKE, CRICKET.

Think about it!

Think

2. Food chains show the relationship between specific organisms in an ecosystem_

author unknownaddress unknownaccessed unknown

a. producers- make food through photosynthesis_

Daniel 's Public Gallery http://picasaweb.google.com/DanGruhn/RockwoodStudy#5111742870457864466accessed 15.02.09

b. consumers- obtain energy by eating others

1) primary consumers eat plants

2) secondary consumers eat animals_

Chinese International Schoolhttp://www.cis.edu.hk/sec/ss/Geography/River2000/features/index.htmlaccessed 15.02.09

c. decomposers- eat the wastes and remains of other organisms_

Hit Recordhttp://www.hitrecord.org/forum/viewtopic.php?t=3212&sid=43f1e8d4c977f488299954ffdfeb2c97accessed 15.02.09

Play

3. Food webs show the relationship between food chains in an ecosystem

a. arrow indicates the flow of energy_

author unknownaddress unknownaccessed unknown

B. Energy Pyramids

1. Energy enters an ecosystem in the form of sunlight

a. energy is transferred to plants by means of photosynthesis

b. energy continues to pass from organism to organism along trophic levels (feeding levels)_

Wikimedia Commonshttp://commons.wikimedia.org/wiki/File:Maple_leaves_in_May_in_Helsinki.jpgaccessed 15.02.09

Play

2. Energy pyramids (biomass and numbers) are a display of energy transfer through an ecosystem

a. each trophic level is symbolized by a horizontal rectangle

b. producers are the base of the pyramid

c. primary consumers, secondary consumers, and tertiary consumers are stacked consecutively on top_

author unknownaddress unknownaccessed unknown

author unknownaddress unknownaccessed unknown

Click

3. The change in numbers and biomass relate to the loss of energy along food chains

a. cellular respiration- carbon dioxide and heat

b. wastes- undigested or uneaten food_

author unknownaddress unknownaccessed unknown

4. Eating plant products rather than animal products is advantageous

a. the energy available in a food chain decreases with each trophic level

b. about only 10% of the energy is passed on

c. animal grazing requires more resources (land, water, energy…)_

Britannicahttp://student.britannica.com/comptons/art/print?id=100128&articleTypeId=1accessed 15.02.09

The End