biotic indices Indicator species, when used as a guide to the level of a particular abiotic factor. For example, the presence of certain invertebrate groups in fresh water can be awarded a score that indicates the quality of the water. A scheme employing biotic indices has a scale ranging from 10 (clean water with diverse fauna) to 0 (grossly polluted water with no fauna or with only a few anaerobic organisms).
More From encyclopedia.com
Indicator , in·di·ca·tor / ˈindiˌkātər/ • n. 1. a thing, esp. a trend or fact, that indicates the state or level of something: car ownership is frequently used a… Ecological Indicator , Skip to main content ecological indicator Indicative , in·dic·a·tive / inˈdikətiv/ • adj. 1. serving as a sign or indication of something: having recurrent dreams is not necessarily indicative of any psyc… Indicator Species , Indicator species are plants and animals that, by their presence, abundance, or chemical composition, demonstrate some distinctive aspect of the char… indication , in·di·ca·tion / ˌindiˈkāshən/ • n. a sign or piece of information that indicates something: the visit was an indication of the improvement in relatio… BY-AND-BY , by / bī/ • prep. 1. identifying the agent performing an action: ∎ after a passive verb: the door was opened by my cousin Annie. ∎ after a noun denoti…
About this article
All Sources -
Updated Aug 08 2016 About encyclopedia.com content Print Topic
You Might Also Like