Ocean Ecosystem

Biotic and Abiotic Factors in My Ecosystem

Biotic Factors: living things in an ecosystem


  • Sea Turtles
  • Whales
  • Dolphins
  • Sharks
  • Jellyfish
  • Fish
  • Octopus
  • Sea lions


  • Algae
  • Seaweed
  • Coral reefs
  • Kelp
  • Sea grass
  • Sea anemone

Abiotic features: nonliving things in my ecosystem.

  • Salt water
  • Sand
  • Rocks
  • Temperature of water
  • Underwater volcanos
  • Sunlight
  • Water curennts

Carrying Capacity:The largest number of individuals of one species that an environment  can support. An organism needs food, shelter, water, and space to survive.

Carrying Capacity and Changes in Population

There are only so many recourses in an ecosystem. So when there are a lot of fish, there won't be enough food, shelter, or space for all of them, so many will die. The ones who survive will reproduce. Then that year there wont be as many fish, so most will survive, but the next year, there wont be enough recourses. this is a cycle.

Sharks prey on sea lions. So if the sea lion population significantly decreased, then so would the shark population would decrease.

Limiting Factors and Predator/Prey Relationship

Limiting Factors: any factor or condition that limits the growth of a population

Food webs are more accurate than food chains because they show things eat multiple things and multiple things eat them.

Food Chains/Food Webs

There are different energy roles in a energy pyramid. There are Plants, Herbivores, Carnivores, and Top carnivores.

If we were to take out the shark in  our food web, the large fish would Become overpopulated and in return the small fish would be under populated.

Plants: make their own food through photosynthesis They get there energy from the sun. (ex. algae)

Herbivores: Get energy by eating plants and only plants. (ex. krill)

Carnivores: Get energy by eating meat. (e. sharks)

Omnivores: Get their energy by eating both meat and plants. (ex. parrot fish)

Trophic Levels and Energy Pyramids

Plants are important because that is where the pyramid starts. they get the energy from the sun, and then Herbivores and omnivores get energy from them, and carnivores and omnivores get energy from them

Level one (producers) 1,000 kc

  • kelp
  • sea anemone
  • sea weed
  • algae

Level two (Herbivores) 100kc

  • Krill
  • Shellfish
  • Coral
  • Shrimp

Level Three (Carnivores and omnivores) 10kc

  • Turtles
  • small fish
  • Large fish
  • Jellyfish

Level Four (Carnivores and omnivores) 1kc

  • Sharks
  • Whales
  • Octopuses
  • Dolphins

An energy pyramid is shaped as it is because it shows where the energy is going. the energy is larger at the bottom because that is where the energy begins.


CO2+H2O (with sunlight) = C6H2O6

Photosynthesis needs these things to take place

  • Water (H2O)
  • Sunlight
  • Carbon Dioxide (CO2)

Two things are produced when a plant photosynthesizes

  • Glucose (C6H12O6)
  • Oxygen (O2)

It happens when carbon dioxide, radiant energy, and water are combined in a plant. with the help of the pigments in the choroplasts it create glucose. (C6H12O6). this is stored for later use. it is also passed on to the consumer that eats the plant.

It goes radiant energy to chemical energy.

Ex. of Tropism

  • Coral growing upright
  • most sea plants grow near the surface to be within reach of sunlight

Tropisms: the turning or bending movement of an organism towards or away from an external stimulus such as light, gravity, or heat.

These plants tropisms allow them to get sunlight for photosynthesis

The role of Decompposers

In every ecosystem, there are decomposers. Decomposers break down all the dead things in the ecosystem and return the nutrients to the earth. Without decomposers there would be waste and dead animals everywhere.

  • sea slugs
  • bacteria
  • lobsters
  • sea worms
  • fungi


We need adaptations in our ecosystems because they help animals evolve and stay alive. without adaptations they wouldn't be able to eat certain things, or hunt certain things. there are physical and behavior adaptations. Ex.

  • fins
  • gills
  • migrations
  • Blubber
  • Camouflage
  • seaweed is tough so it isn't ripped up

If organisms from my environment were to be placed into another ecosystem, they would most likely die from too much oxygen, but there are some organisms that might be able to adapt and live on land or in another ecosystem. for instance if a dolphin was to be placed into a tundra, it wouldn't be able to move their fins, and since they are used to brething underwater, they wouldn't be able to survive.

Natural Selection: The process by which inheritable traits are passed on through successful future generations.

Natural selection is important because it allows favorable traits to be passed on to future generations. This way the animals with the favorable traits can reproduce and survive.

One form of adaptations is camouflage. The fish who aren't camouflaged are easily spotted and eaten.  this way only the fish with the favorable traits can survive. then the fish with camouflage can reproduce, so the trait will be passed onto future generations. this will help the species will survive.

Comment Stream

View Older Posts
3 years ago

@saharmirza Thanks Sahar!

3 years ago

@wadecoons Thank you Wade!

3 years ago

@emilyperez1 Thank you Emily

3 years ago

@katherinerose Thanks Katie!

3 years ago

See if you can find a collage of biotic factors or cut out some on the pictures...you don't need that many. Also, try and be more specific with abiotic factors.

3 years ago

love the pictures

3 years ago

@lindseymeyers Thank you! You're fabulous!

3 years ago

Good tack nice pics

3 years ago

love the work it's amazing

3 years ago