Ecosystem Portfolio.

The lake:


Biotic Factors of the Lake:

Grass and trees/ biotic.





plants,  and,

wood of a lake house.

Abiotic Factors of the Lake:

water and weather/ abiotic.






and  rocks.

Carrying Capacity; Different changes at the lake.

Carrying capacity,   

  1. The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.
  2. food, water, space, and shelter.
  3. The population starts to die off when the weather gets cooler.

                 Through out the months, there are different weather changes inn the lake. Just like the graph below. Different animals such as a fish have to swim in different places to live, rather than the water, it freezes. In the months that this happens its cause of the earths rotation.

Line graph of the weather of the lake throughout the year.

Limiting factors.

The population of different fishes.

The population of any of these fishes might decrease from the cause of lack of something, such as food, weather , or anything they might need in order to survive. Such as, if a Walleye dies, then, the fish that eat that, will die of lack of food.  The population of any fish my increase if theres more of one kind of fish that eat the other fish. Such as  more of striped shiner.                                                                                                                                                        All living things need food, water, shelter and space to survive. Aas long as organisms have all of these things available to them their population will continue to grow. However, populations cannot grow forever. Some form of environmental resistance will stop the population’s growth. The form of environmental resistance is called a limiting factor since it limits the population. However, limiting factors may also increase a population. We will look at many different limiting factors and classify them into density independent factors and density dependent factors.

energy roles in the lake.

Producers in a l

The producers in a lake or pond ecosystem would be the plants: algae, seaweed, etc. The consumers would then be the fish, turtle, frogs, etc. Finally, the decomposers are animals, fungi, etc. which break down animal or plant material after it dies. The same animals who were consumers may also be decomposers.

Food Webs for the lake .

Food webs.

Food webs are usually very complex and, in any one lake ecosystem, hundreds of different species can be involved. Because the available energy decreases at each trophic level, a large food base of primary producers (mostly plants) is necessary to support relatively few large fish.                                                                                                                             If one of the populations where removed, there would be a different ecosystem because, that ecosystem wouldn't be the same without that specific population.

A Energy pyramid for the Lake.

energy pyramid
  1. An energy pyramid's shape shows how the amount of useful energy that enters each level  chemical energy in the form of food decreases as it is used by the organisms in that level.

Producers are at the bottom of the pyramid because they are able to transform the sun’s energy into a large amount of plant energy through the process of photosynthesis.

Predators are found at the top of the level because, they eat what is before them. In other words they have the most energy.


Diagram of photosynthesis.

CO2 + H2O + photons --> CH2O + O2

This can be read as carbon dioxide plus water plus photons (energy from sunlight) gives a carbohydrate (CH2O) and oxygen. You are probably looking for standard plant photosynthesis to make glucose.

6CO2 + 6H2O + photons --> C6H12O6 + 6                                                                                               During the process of photosynthesis plants break apart the reactants ofcarbon dioxide and water and recombine them to produce oxygen (O2) and a form of sugar called glucose (C6H12O6).

Photosynthesis starts in chlorplast.

Tropisms in a lake.

A tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant.

  • Positive = the plant, or a part of it, grows in the direction from which the stimulus originates.
  • Negative = growth away from the stimulus
  • Light = phototropism
    • Stems are positively phototropic. Roots are negatively phototropic                                                                              gravity- Stems are negatively gravitropic while roots are positively gravity
    • some examples of a tropisms would

Decomposers in the lake

Decomposers break down materials in an ecosystem and release organic compounds to be used by plants. Best Answer: Decomposers complete the cycle of matter by breaking down organic matter into inorganic nutrients that can be reused by producers. Without decomposers, the entire world would be knee-deep in plant litter, dead animal bodies, animal wastes, and garbage, and most life as we know it would no longer exist.

Some of the decomposers in a lake

  Bacteria, fungi, and other microorganisms, other specific types of decomposers are worms.

(The video down below shows of a rabbit decomposing in a time-lapse video over time.)

Comment Stream

2 years ago

great add better pics!!!!!!!!!!!!!!!!!!1!11! nowwww

2 years ago

😍 😍 😍 😍 😍 great job👍

2 years ago

show my mom

2 years ago


2 years ago

Lexi, steps 1 through 4 are coming along! Please make sure to fix the last picture you have added. The last picture does not belong in a lake ecosystem.

2 years ago


2 years ago