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What is an ecosystem?

by simon

How ecosystems function

An ecosystem is a community of lifeforms that interact in such an optimal way that how ecosystems function best, is when all components (including humans and other animals) can persist and live alongside each other for the longest time possible.

Ecosystems are fuelled by the energy created by plants (primary producers) that convert the Sun’s heat energy into chemical energy but this also creates waste. Without animals, plant-based systems would make so much waste, they would collapse under the weight of their own release of massive amounts of free surplus energy (which we call “pollution”).

After animals evolved, this free energy was able to be absorbed into food chains and the system stabilised. This is why pristine ecosystems have very little excess nutrient in soil or water and the carbon they process, is in harmony with the atmosphere. In other words, the animal-driven components process just as much energy as the plants waste from the Sun each day. This is important because otherwise, the production of waste energy increases a system’s chaos, which manifests as climate change.

Ecosystems exist only because they minimise the chaos plants can create. Animals evolved because they build the ecosystem structure that is the most stable. Therefore, animals are the reason for ecosystems.

Ecosystem structures are an acute interdependency with their components, meaning the system and its wildlife cannot exist without each other. It’s this interdependency and network of processes that we call “biodiversity”.

  • Therefore, plants can provide habitat for animals but are not ecosystems without animals*
  • Biodiversity is the sum total of all the processes that happen within ecosystems and deliver life support for animals.

*You could argue that plants are ecosystems but as humans can’t survive in them without the animal components, that would be rather self-defeating from a conservation perspective.

The consequence of minimising waste energy (pollution) and the creation of a steady stable-state of being, is clean water and air, abundant and energy-rich food (the energy is now concentrated and contained safely inside biological systems).

Wildlife benefits by consuming the products that grow within ecosystems and when these are operating optimally, the nutrients (another way of saying “energy”) are at their highest concentrations, able to fuel the bodies of larger animals.

Humans are just another animal that evolved as part of these stabilisation mechanisms and as much as any other animal, therefore, rely on maintaining ecosystem structure and function for the species’ survival. From a human (and other animal) perspective, ecosystems are not vegetation. The functional part that enables animal life is the part that animals create for each other–to stabilise their own living environment.

All this means that ecosystems cannot operate without a suite of animals working together. Wildlife is the essential underpinning of all life support for human beings and the stability and delivery of sufficient nutrient to survive, depends on other animals being present in proportionate numbers, to maintain ecosystem structure and function.

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