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Resonance

, Volume 23, Issue 11, pp 1205–1213 | Cite as

Trophic Cascades

  • T Ramakrishna RaoEmail author
General Article
  • 8 Downloads

Abstract

In many ecosystems, apex consumers (top predators) play a crucial role in food web dynamics. Their top-down impacts are known to spread downwards through the food webs in a cascading fashion. Trophic cascades manifest when top predators are excluded from an ecosystem or introduced into a system lacking them. Two such case studies are described here. Trophic cascades are generally more pronounced in the aquatic than in the terrestrial ecosystems, which in turn is related to the differences in the average body sizes of herbivores relative to the plant resources they feed upon and in the structure of their food webs. Scientists express concern that human activities have been leading to planet-wide trophic downgrading (loss of apex consumers) which could affect vital ecological processes of the biosphere.

Keywords

Trophic cascade trophic downgrading trophic tangles food web aquatic ecosystem resource consumer biomanipulation 

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.19 Shakti Apartments Phase-III, Ashok ViharDelhiIndia

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