The insect material; The biological properties of aphids and their host plant relationships; Evaluating aphid populations on plants; Methods for studying effectiveness of natural enemies; Aerial sampling; Measurement of the physical environment ...

The complexity of ecosystems forms perhaps the greatest challenge for natural science. Even the first step to comprehensive analysis, namely a survey of the participating species, often forms a major obstacle. This makes it understandable that ...

This book gives information about lakes and explains how they are affected by nutrients derived from human activities.