Here are entered works on the interrelationships of organisms and their environment, including other organisms. Works on the composite of physical, biological, and social sciences concerned with the conditions of the environment and their effects are entered under Environmental sciences. Works on the relationship of humans to the natural environment are entered under Human ecology. Works on the relationship of humans to their sociocultural environment are entered under Social ecology. --subdivision Environmental aspects under subjects, e.g. Agricultural chemicals--Environmental aspects; Nuclear power plants--Environmental aspects; and headings beginning with the word Ecological
Here are entered works on estimating and evaluating the actual or potential hazards that toxic substances pose to an ecosystem. Works on estimating and evaluating the effects that human activities have on living organisms and their habitats are entered under Ecological assessment (Biology).
Here are entered works on evaluation of the condition of a body of water based on surveys and other measurements of the resident biota. Works on testing to determine the degree of pollution of water by comparing its effect on a living organism with the effect of a standard preparation are entered under Water quality bioassay.