Question

give reasons for the role of smaller animals in the ecosystems should not be ignored.

Answer 1

Hey!!

Here your answer is...

The food chain is the main part of theecosystem and the small animals play a vital role in this food chain. ... The larger animals consume the small animals and therefore the food chain structure a pyramid eco-system. Each living particle contributes something to the ecosystem

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Answer 2

By Michael Samways, The Conversation

SMITHSONIAN.COM 
MARCH 31, 2017

Humans like to think that they rule the planet and are hard-wired to do so. But our stewardship has been anything but successful. The last major extinction event, 66 million years ago, was caused by a meteorite. But the next mass extinction event, which is under way right now, is our fault.

Geologists have even given this era in the history of the Earth a new name to reflect our role: the Anthropocene, the age of humans.

It’s the first time in the history of the Earth in which one species dominates all the others. These “others” numbers are probably around 10 million. The vast majority are the invertebrates, the animals without backbones. Not all are so small—some squids and jellyfish are several meters long or across.

Most, though, are small and unassuming. And they are hidden in plain view. They are busy maintaining the fabric of the world around us. They are the warp and weft of all natural systems. They make the soil, pollinate the flowers, spread seeds and recycle valuable nutrients back into the soil. They are also food for many birds that are so loved, and keep other small animals in check by eating or parasitising them.