Species and Populations (2.1)
Section Links: |
Notes & Review:Population Notes (2.1 and 2.5)Jeopardy Review (2.1, 2.4, & 2.5) |
Ecology Definitions
|
|
Scientific Names
Scientific names = are used by the scientific community to delineate specific species.
Example: Human = Homo sapiens Understanding Scientific Names |
Fundamental vs Realized Niche
A fundamental niche = the full range of conditions and resources in which a species could survive and reproduce.
A realized niche = the actual conditions and resources in which a species exists due to biotic interactions. In the example below: the Chthalamus CAN occupy the entire hillside between high tide and low tied. But when competition with the Semibalanus species arrives, the Chthalamus moves to occupy the high tide regions only. The first scenario is the fundamental niche. The second is it's realized niche based on the interactions with the Semibalanus. |
|
ABIOTIC FACTORS
Abiotic factors = non-living, physical factors that influence the organisms and the ecosystem.
Abiotic factors have drastic consequences on ecosystems. Without the abiotic factors the ecosystem doesn't exist. They also influence the types of organisms that can live there and the amount of life that can be sustained.
|
|
BIOTIC INTERACTIONS
|
|
See examples below:
Predation Examples: Cobra and Mongoose
Parasitism: Zombie Snails
Mutualism: Crazy Ant Farmers
Commensalism: Whale and Remora
Predation Examples: Cobra and Mongoose
Parasitism: Zombie Snails
Mutualism: Crazy Ant Farmers
Commensalism: Whale and Remora
|
|
Competition explained:
|
|
What effects population size?
Three factors affect population size:
|
Carrying Capacity
Populations grow based on the available resources present. If NO limiting factors are present, the population will grow exponentially. (J-curve) If limiting factors exist this creates a carrying capacity, and the resultant S curve.
Growth Curves Factors affecting population size and density S vs J Curves - includes population dynamics and equations |
|