According to his study, "Most cockroaches feed on decaying organic matter, which traps a lot of nitrogen. Cockroach feeding has the effect of releasing that nitrogen (in their feces) which then gets into the soil and is used by plants.” This proved that extinction of cockroaches would actually have a larger impact on our gardens and forests and indirectly on the lives of other insects, as all form an important part of the food chain.
Cockroaches, feed on decaying organic matter, rats, mouse, and lizards as well as other species of mammals and birds feed on them. They are in turn eaten by bigger predators such as cats, reptiles and eagles. Thus if cockroaches are removed from the face of earth then although the other animals won't be extinct, as they have other food than cockroaches, but their number would certainly decline. The Parasitic wasps, however would come to an end as they rely on parasitising cockroach eggs and hence on cockroaches. The nitrogen cycle would also be disturbed, cautioned Professor Kambhampati. Thus, the next time, before going after an insect with your broom, think how it affects our ecosystem as every species counts.
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