Advantages and disadvantages: 1, quantity pyramid
The number of individuals in each trophic level in the ecosystem at a certain moment. The meaning of each step: it indicates the number of individual organisms in each trophic level. The phenomenon of hanging upside down often occurs. With the increase of trophic level, the energy is less and less, and the size of animals is generally larger and larger, so the number of biological individuals is less and less.
2. Biomass Pyramid
Weight relationship of organisms of different trophic levels in an ecosystem at a certain moment. Energy exists in the form of matter, so the biomass of each trophic level (the total mass of existing biological organic matter) represents the energy value to a certain extent. In this sense, the shape of the biomass pyramid is roughly similar to that of the energy pyramid. Special shape of biomass cone: For example, in marine ecosystem, producer phytoplankton is small in size and short in life, and will be eaten by zooplankton continuously, so the biomass of phytoplankton investigated at a certain moment may be lower than that of its predator zooplankton, but this does not mean that the energy flowing through producer is less than that flowing through zooplankton.
3. Energy Pyramid
The energy absorbed by each trophic level in the ecosystem over a period of time. The lower the nutritional level, the more energy it takes up; On the contrary, the higher the nutritional level, the less energy it takes up. Therefore, the bottom of the energy pyramid is the largest, and it gets smaller as it goes up. The energy pyramid will never be reversed.