Slide 1

A love, hate thing

Slide 2

Every organism in an ecosystem has a role or job to carry out That job and how it uses the conditions around it is called a niche Examples include: an organisms place in the food web; producer, consumer, decomposer. How it interacts with other living things (biotic factors) Where and how it lives out its life Resources (abiotic factors) that affect it.

Slide 3

Competition Predation: predator and prey Symbiosis Mutualism Commensalism Parasitism

Slide 4

Competition exists between members of the same species and between species. What are organisms competing for? Resources: food, water, living space, etc.

Slide 5

Contrary to common thought An organism wont eat all the prey. What would happen to the predator

Slide 6

Sym; together Biosis: living Symbiosis is defined as a relationship when two organisms live closely (in or on) together. Three types

Slide 7

Ill scratch your back if you scratch mine

Slide 8

When one member in the relationship is benefited and the otherwell no harm, nor help

Slide 9

One member is helped by the relationship and the other is harmed.

Slide 10

Orderly, natural changes and species replacements that take place in the communities of an ecosystem. Often follows a predictable, orderly pattern. Two types: Primary and Secondary

Slide 11

Step 1 - Bare rock (0-1 years) Lichens grow on the bare rock (a pioneer species). As they die, the decaying lichens form soil so moss can grow. http://botit.botany.wisc.edu/images/veg/

Slide 12

Step 2 - Grassland (2-4 years) Grasses and other small plants grow; out-competing the mosses for sunlight. http://botit.botany.wisc.edu/images/veg/

Slide 13

Step 3 - Transitional or shrub (5-20 years) Small shrubs such as dogwood and sumac begin to dominate.

Slide 14

Step 4 - Coniferous Forest (20-100 years) Pines and fir trees begin to shade out the smaller shrubs http://botit.botany.wisc.edu/images/veg/

Slide 15

Pine forest

Slide 16

Step 5 - Deciduous Forest (100-200 years) Large, slow-growing trees such as oak, maple and hickory replace the pinesif the abiotic factors allow it to happen.

Slide 17

Succession that occurs after a community is disrupted by natural disasters or human activity. Examples = fire, flood *Occurs in a shorter amount of time because soil and sometimes seeds present.

Slide 18

Yellowstone National Park (after a 1988 forest fire)

Slide 19

Southern WI = Prairie Baraboo = deciduous forests Northern Wa = temperate rainforest in Olympics http://botit.botany.wisc.edu/images/veg/