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- Title
Why are parts of the world green? Multiple factors control productivity and the distribution of biomass
- Authors
Polis, G. A.
- Abstract
This paper evaluates the multiple factors that determine the production of plant biomass and its distribution among producers and varioustrophic groups of consumers. In rough order of their importance, water and nutrient availability, factors that deter herbivores (plant defenses, environmental heterogeneity and disturbance, nutrient stoichiometry), and consumption by herbivores appear to the most universal determinants of the production and distribution of plant biomass. In some times and places, indirect effects from enemies of herbivores (predators, parasites, parasitoids and pathogens) propagate through the food web to influence plant biomass, in a manner somewhat consistent with green world and exploitation ecosystem mechanisms. I discuss whysuch food web dynamics appear to be much more important in water than on land. The only demonstrated cases of community-level trophic cascades occur in water. Although species-level cascades are moderately frequent on land, community-level cascades rarely or never occur.
- Subjects
BIOMASS; BIOMASS production
- Publication
Oikos, 1999, Vol 86, Issue 1, p3
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3546565