Chapter 54.2, Problem 3CC

Summary Introduction

To determine: How would biomass of grass change if the community organization models, bottom-up model and top-down model are applied.

Concept introduction:

Two community organization models are common: the bottom-up model and the top-down model.

The bottom-up model depicts a unidirectional influence from lower to higher trophic levels in which presence or absence of mineral nutrients controls the plant numbers which in turn controls the herbivore. Herbivore finally controls the predator numbers. Top-down model says that the community organization depends mainly upon the interactions which finally results in predation.