The pyramid of biomass depicts the relationship between the trophic levels and the biomass by quantifying the amount of biomass at every ecological communityâ€™s trophic level at a certain time. It graphically represents the biomass, also known as the total amount of organic or living matter in a particular ecosystem existing in the different trophic levels in the unit area. The typical units are calories per meter square or grams per meter square. A pyramid of biomass can be inverted. Like in the pond ecosystem, the significant producers known as the phytoplankton’s standing crop will be in the lower trophic level than the heterotrophs like the insects and fish. This is explained by the fact that the phytoplankton has shorter individual lives, but they reproduce very quickly. The pyramid of numbers graphically depicts the abundance or population based on the number of organisms that are involved in every level in the food chain. This pyramid usually represents the number of individuals at every trophic level while not considering their biomass and size. The pyramid does not necessarily be upright. An example of an inverted pyramid of numbers is observed if the parasites feed on big host animals, or the beetles feed on the first tree’s output.
Importance and limitations
An ecological pyramid is very important as it depicts organisms feeding patterns in different ecosystems. It also indicates the energy transfer and how the change in number in one trophic level affects the trophic levels below and above it. Over the years, the data is collected, and it is used to compare the impact the environmental changes have on an organism. Over the years, the condition of the ecosystem is observed to worsen because of overhunting by humans or pollution, action should be taken against it so that future damage can be prevented, and the present damage should be reversed to some extent. The limitations of the ecological pyramids are-
The multiple trophic levels can be occupied by more than one type of species, as observed in the food web.
The saprophytes are a significant part of the ecosystem, but they are not considered to be a part of any pyramids.
The pyramids are mostly applicable to only simple food chains, that do not occur naturally.
The pyramids do not have any concept related to the variations in climate and season.
The pyramids also do not assume the possibility that the same species can exist at different levels.
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