Exam 58: Dynamics of Ecosystems

The following figure shows studies in a stream where enclosures were setup either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae?

Energy enters the ecosystem mainly by the process of

The scarcity of which two elements limits plant growth?

A(n)________ is a permeable underground layer of rock,sand,and gravel saturated with groundwater.

Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem.This process is called

The rate of production of new biomass by heterotrophs is called

Which one of the following observations was not an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability?

Choose the letter of the best match from the following: -Organisms that feed on one another;include producers,consumers,detritivores;the length and complexity of the chain of these organisms vary.

Over tropical rainforest areas,approximately 90% of the water that reaches the atmosphere comes from