Unit 1: The Living World: Ecosystems

Resource partitioning + example

Dividing a niche to avoid competition and optimize resources

Interspecific

Niche

The role an organism plays in a community

Interspecies

Between 2 species

Lion + tiger

Intraspecies

Within the same species

2 male deer

Mutualism

Benefit each other

Dandelion + bee

Commensalism

Benefit one but does nothing to the other

Shark + little fishes

Paratism

No death

Cow + grass

Gross Primary Productivity

Rate plants convert s9lar energy into chemical energy

Photosynthate

Net Primary Productivity

Represents left over energy into photosynthate for consumers after plants do cellular respiration

Respiration

Represents energy used for cellular respiration

Primary Productivity

Rate organic compounds are created / stored in ecosystems

Formula for net productivity

NPP = GPP - R

Biomes

Formula

NPP = GPP - R

Assimilation

Plant = DNA → DNA = Animal

Abiotic Nitrogen Fixation

Atmosphere = Nitrogen Gas (N2) → Nitrate (NO2) = Settles in soil

Ammomification

Dead animal = DNA → Ammonium (NH4+) = Soil

Denitrification

Soil = Nitrate (NO2) → Nitrogen Gas (N2) = Atmosphere

Nitrification

Soil = Ammonium (NH4+) → Nitrate (NO2) = Soil

Biotic Nitrogen Fixation

Atmosphere = Nitrogen Gas (N2) → Ammonium (NH4+) = Soil/plant roots

Food Web order

1. Primary producers

2. Primary consumers

3. Secondary consumers

4. Tertiary consumer

What do the arrows on a good web indicate?

Flow of energy in trophic levels

Equation for food web

NRG Captured/Total NRG x 100