Ecosystems and Communities Chapter 4 & 5 Notes
Feb 25, 2016
Ecosystems and Communities
Chapter 4 & 5 Notes
• Every organism affects its environment, and in turn is affected by its environment. Ecosystems are affected by two kinds of factors
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The Nonliving EnvironmentThe Nonliving Environment• Abiotic factors-Abiotic factors-
______________________________________________________________________________________________________
• Ex. ______________Ex. ______________
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The Living EnvironmentThe Living Environment•Biotic factors-Biotic factors- ___________ ___________
____________________________________________________________________________________________
•All organisms depend on All organisms depend on others directly or indirectly for others directly or indirectly for food, shelter, reproduction, or food, shelter, reproduction, or protection.protection.
Biotic or Abiotic?
1. Predators ________________ 2. Hot weather ________________ 3. Acid rain ________________ 4. Wood from trees ______________5. Your parents ________________ 6. The river flow ________________ 7. The leeches found in the river
________________
The Role of Climate
• Weather: ____________________________________________________________________________– Temperature– Wind– Precipitation– Humidity– Specific weather
patterns
Weather for Sugar Land, TX
Sunday Sept. 16, 2007
The Role of Climate• Climate: it is the average conditions in a region
over several decades; affects the soil, and in turn the vegetation, and in turn other organisms in an area. It is described by:
1. _______________________2. _______________________
The Role of Climate• __________________________________
__________________________________
The Role of Climate
• Polar: 90-66.5º N or S (within the Arctic and Antarctic circles)
• Temperate: from the lines of Tropic of Cancer and Capricorn to 66.5 º N or S, respectively
• Tropical: between the Tropic of Cancer and Tropic of Capricorn
Polar (blue)Temperate (green)Tropical (red)
Other determinates of weather and climate:
• Coastal or central to the continent?• __________________________________
____________________________________________________________________
Other determinates of weather and climate:
• Upwelling: ___________________________
________________________________________________________________________
Diagram illustrating the principle of equatorial upwelling. Winds along the equator (dotted line) create currents, which are then diverted north and south by the Coriolis force. The cold, deep waters from below rise to the surface to replace these diverted waters, causing upwelling.
http://earthguide.ucsd.edu/virtualmuseum/climatechange1/11_2.shtml
• Greenhouse Effect: the natural situation in which heat is retained by the greenhouse gases (CO2, methane, water vapor, etc.) is called the greenhouse effect. If these gases were not present, the Earth would be 30º C cooler and unlivable
Biomes• -a collection of ecosystems with the same
climate and dominant communities; 2 main areas of biomes– Aquatic- in water– Terrestrial- on land
Aquatic
• Photic zone- _______________________ (shallow water)
• Aphotic zone- ______________________ (deep water)
• Estuary- ______________________________________ (end of a river)
• Tidal zone- __________________________
Tidal Zone
Photic Zone
Aphotic Zone
Community Interactions
• Habitat- ___________________________• Niche- ____________________________
__________________________________• Competition- _______________________
__________________________________– Interspecific competition: between members
of different species– Intraspecific competition: between members
of the same species
Predation
• ____________________________________________________________________ ex: lion eats a zebra
Community Interactions
• Symbiosis- __________________________________________________________
Community Interactions
• Mutualism- _______________________________________________________ (ant live on an acacia tree, ant protects tree from harmful plants, tree gives ant a home)
Clownfish live within sea anemones, which normally sting other fish. The fish gets protection, and the anemone benefits because the clownfish keep it clean of bacteria.
Community Interactions
• Parasitism- __________________________________________________________ (fleas or ticks on a dog; flea gets a home, sucks the dog’s blood and is bothered by it)
Leech sucks the blood of a human
Community Interactions
• Commensalism- ______________________________________________________ (moss growing on trees)
Epiphytes are plants that grow on other plants without harming them. They never set root in the ground!
When grazing cows walk around, they disturb the ground, which
stirs up insects. Birds follow the cows around and eat these
insects.
Cleaner shrimp living in the ocean eat ectoparasites off of larger fish.
The cleaner fish get a meal and the
larger fish get rid of a parasite.
A botfly lays maggots inside a man's head, providing
shelter and nutrition for its young.
Factors Affecting PopulationsThree things affect population size:1. ________________________________2. ________________________________3. ________________________________
________________________________________________________________
Types of Growth
• Exponential Growth- if a population has abundant space and food, no disease or predators; it will grow at an exponential rate. It is a J-shaped curve resembling y = ax2 + b
Types of Growth
• Logistic Growth- population growth slows then stops (stays stable) after a period of exponential growth once resources become less available. The number at which the environment can support this population is known as the carrying capacity.
Limiting factors
• factor that causes a population to decrease in size
• Two types…
Limiting Factors• Density dependent- _________________________
___________________________________________________________________________________________________________________________
• Notice the pattern of population size with predator/prey relationship of hares and lynxes
Limiting Factors
Density independent- ________________
______________________________________________________________________________________________________ Unusual weather natural disasters seasonal cycles certain human activities
Ecological Successiono After such disasters, a community can
start anew by a process called ecological succession (series of predictable changes that occurs in a community over time); there are two types
Succession Primary succession- _________________
______________________________________________________________________________________________________
Succession
Secondary succession- _______________
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