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The algae will reduce both air and light causing the organisms in the pond to die.
the plants at the bottom of the pond cannot photosynthesize and die as the floating plants are blocking the sunlight from reaching the plants at the bottom.the whole community of organisms there will be affected.
Algae covered the top of the pond. The pond was full of algae.
Goldfish will feed on the algae and minute organisms found around the weeds.
What is arguably at the base of the food chain in a pond are the organisms that use sunlight to synthesize the stuff they need. Those would be the algae.
Yes, it is because without any algae some living animals in the pond would die. Algae can be food for some creatures in the pond. If your pond is just for admiring and not for living creatures, no, it isn't because the algae will take over the pond and no living creature is in it to eat the algae.
use a magnifying glass
An ecosystem is a biological community of interacting organisms and their physical environment. So for example, fish who live in a pond have their own ecosystem. The pond will have the food and other animals needed such as algae, and other life that survive in a pond.
Snails and tadpoles
The pond would become acidic and have less ability to support organisms
algae
you kill the algae