Energy Flow in Ecosystems

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A-level 3 pyramids

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Ecological Concepts : 

Ecological Concepts Energy flow and trophic levels

Recap from our previous learning experience : 

Recap from our previous learning experience Energy flows through a food chain Food chains start with a producer Food webs are made up of interlinking food chains

There are four important levels in most food chains:Producers: Organisms which convert some of the energy from the sun into stored chemical energy (usually plants).Primary consumers: Organisms that obtain energy by consuming producers. They are herbivores.Secondary consumers: Organisms which obtain energy by consuming primary consumers. They are carnivores.Decomposers: These organisms form the end point of every food chain. They are bacteria or fungi that obtain their energy by breaking down dead organisms from the other trophic levels. : 

There are four important levels in most food chains:Producers: Organisms which convert some of the energy from the sun into stored chemical energy (usually plants).Primary consumers: Organisms that obtain energy by consuming producers. They are herbivores.Secondary consumers: Organisms which obtain energy by consuming primary consumers. They are carnivores.Decomposers: These organisms form the end point of every food chain. They are bacteria or fungi that obtain their energy by breaking down dead organisms from the other trophic levels.

Today’s topicBiological pyramids in the ecosystem : 

Today’s topicBiological pyramids in the ecosystem

Number Pyramids : 

Number Pyramids This is pyramids that display the number of organisms in an ecosystem What is the relationship between the number of animals and size of the level?

Number Pyramids 2 : 

Number Pyramids 2 A pyramid of numbers shows the relative number of organisms at each stage of a food chain. Here is an example of a food chain: Grass Plant (producer)  → Vole (primary consumer)  → Barn owl (secondary consumer) The pyramid of numbers for this food chain would look like this:

Number pyramid : 

Number pyramid 3 Voles 1 1 Owl Owl Many plants

BiomassThe dry mass of an organism is called its biomass. The total biomass at a particular step in a food chain is always less than the total biomass at the step before it. Let's look again at the food chain:grass → vole → barn owlThe biomass of all the grass plants is the greatest in the chain, and the biomass of all the barn owls is the least. We can show information like this using a pyramid of biomass. : 

BiomassThe dry mass of an organism is called its biomass. The total biomass at a particular step in a food chain is always less than the total biomass at the step before it. Let's look again at the food chain:grass → vole → barn owlThe biomass of all the grass plants is the greatest in the chain, and the biomass of all the barn owls is the least. We can show information like this using a pyramid of biomass. Pyramids of Biomass

Bio mass pyramid : 

Bio mass pyramid

The amount of available energy decreases at every step in a food chain. : 

The amount of available energy decreases at every step in a food chain. Energy Pyramid

Some energy goes into growth in biomass and the production of offspring, but most is used up in other ways:sunlight is reflected off leaves instead of being used for photosynthesisenergy is lost through respiration as heatenergy is lost because of excretion and defecationenergy is used for movement and transport : 

Some energy goes into growth in biomass and the production of offspring, but most is used up in other ways:sunlight is reflected off leaves instead of being used for photosynthesisenergy is lost through respiration as heatenergy is lost because of excretion and defecationenergy is used for movement and transport Energy Pyramid