Ecosystem Portfolio #3
Marine Ecosystem

Biotic factors






Abiotic Factors






What is Carrying capacity?

Carrying capacity-the number of people, other living organisms, or crops that a region can support without environmental degradation.

Substantial changes in relative biomass of the main commercial species from 1915  to 1961 , there were no great changes to relative biomass at lower trophic levels. The biomass density of all large fish , such as flathead , latchet, other large fish , and redfish. Decreased by 73%  from 1915 to 1961, the effect of the southeast austrailian trawl fishery was fishing down the food web. Resulting in fewer of the large fish, while the small fish, plankton, and crustaceans remained.

Limiting Factors and Predator / Prey Relationships

Limiting Factors- the environmental factor that is of predominant importance in restricting the size of population < lack of winter browse is a limiting factor for many deer herds>


2. Water

3. Oxygen

4. Temperature

Leopard seal and cod, Leopard seal is a 3rd level cosumers and the cod is 2nd level consumers. The Leopard seal is the predator, which eats the cod fish. a limit factor for a leopard seal is that no cod fish the leopard will die and increases the population of the cod fish. If the cod fish dosen't have a producer to get its energy the leopard seal will decrease.

Leopard seal eating a cod fish

Energy Roles

The leopard seal eats the cod fish without the phytoplankton the cod fish would decrease in population.

Energy Roles:Determined by how the organisms gain their energy and how it interacts with other living things in its ecosystem.

Blue Marlin-Omnivore
Green Sea Turtle-Herbivore

Producer-An autotrophic organism capable of producing complex organic compounds from simple inorganic molecules through the process of photosynthesis (using light energy).

Examples: Phytoplankton, algae

Herbivores-An animal that feeds on plants

Examples:Green sea turtle (Herbivores)

Carnivores-An animal that feeds on flesh

Example:Whales (Carnivore)

Omnivores-An animal or person that eats plants and animals

Example:Blue Marlin (Omnivore)

Decomposers-An organism, especially a soil bacterium, fungus,or inverte, that decomposes organic material.

Examples: Baterica, fungi,

Scavengers-An animal that feeds on dead plant material, or refuse.

Examples: crabs, shirmp,worms

All of the energy roles get their energy from what they eat,The producers are vital to the ecosystem because its  the main energy role, they start with the most energy to give it to the organism that eats it. Then the food chain or web starts to grow.

Food Chains and Food Webs

Food webs are more realistic because they show mutiple interactions and different types of organims on what eats who.Food chains are just depictions of energy flow with one producer.

If i took out the phytoplankton it would affect the zooplankton and the other organisms. Bascially they would all die.

Trophic Levels and Energy Pyramids

This Pyramid shows where the organisms get their energy from and as it keeps going up the energy gets less  energy for the other organisms.

The producers are the largest in the trophic level because it has the most energy which the producers get the energy from the sun. The predators have the least energy because they get the energy from what they eat.

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