Marine Ecosystem 
o Oceans major ecosystem is marine ecosystem.
o Marine Ecosystem is one of the largest aquatic ecosystem.
o It includes oceans , salt marshes , estuaries ,and more.
o The oceans biome is aquatic.
o An aquatic ecosystem is made of a body of water.
Producers
 Only two types of living things in the ocean make food using sunlight.
These are called producers. One type is phytoplankton. Huge
numbers of phytoplankton, most of them only visible under a
microscope, drift with the currents and are food for
the zooplankton such as copepods and young urchins!!
*The second type are the seaweeds, which are large algae. The largest
seaweeds grow low in the intertidal zone and extend out into the subtidal zone. These are the kelps, large brown seaweeds that are glued
to the rocks with their holdfast. Their long blades float at or near the
surface of the water where they get sunlight to make food, which allows
them to grow very fast. Their holdfast glue is very strong, and it can
keep the huge kelp in one place even when strong currents and waves
occur during storms!!!
Biotic Factors
 Fish
 Whales
 Sharks
 Dolphins
 Plants
 Jellyfish
 Etc.
Energy pyramid
Food Web
Food chain
Primary Consumers!!
 Primary consumers
Primary consumer are basically the herbivores of the ocean.
In places like the ocean, the primary consumers are lobster,
mussules, and shrimp. Shrimp are still considered primary
consumers even though they eat phytoplankton, which are a
producer rather than a plant. This is because phytoplankton
gets energy from the sun, not plants. You can read more in
producers but this is primary consumers. There are many
more primary consumers in the ocean but that's what I can
think of. You can learn more on other pages.
Secondary Consumers!!
 Harp Seals
 Bottlenose Dolphins
 Octopus and Squid
 Green Sea Turtles
 Baleen Whale
 Blue Whale
 Small Fish
 Car-beater Seal
Decomposers
 A few decomposers of the ocean are:
bacteria, fungus, marine worms, sea slugs, sea worms, brittle
stars, etc.
There's also Nassarius snails and Sand sifting Starfish. They eat
Defrius out of the sand.
Abiotic Factors
 Temperature
 Salinity
 Nutrients
 Oxygen
 Solar Energy
 Water Clarity