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16 Cards in this Set

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LC50 (lethal concentration 50)

One method is to determine what is the concentration pollutants that kills 50% of the indicator organism.


composed of all populations within a defined area


consists of both the community and abiotic components.


consists of all ecosystems of the whole world where organisms exist


A group of interbreading individuals of the same species in a defined area.

Eutrophication or hypertrophication

, is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

Percent of energy loss through each transfer

90% lost (heat and waste)

Producers 1000kg

Herbivores 100kg

Primary carnivores 10kg

Top carnivores 1kg

Source of carbon dioxide in the atmosphere.

Combustion of fossil fuels, respiration in plant or animals and respiration in decomposers

Source of organic compounds in plants

The carbon dioxide in the atmosphere.

Source of organic compounds in animals

Feeding on plants

Source of carbon in fossil fuels

Fossilized organic material from plants( and animal)

Source of carbon in dead organic matter.

Death of plant or animal matter

Primary secession

An ecological secession that occurs following an opening of uninhabited, barren habitat or that occurs on an environment that is devoid of vegitation and usually lacking top soil

Climax community

is a biological association of flora and fauna which has attained an equilibrium condition. Such a circumstance comes about because this is composed of species best adapted to conditions in that specific locale.

This followed the pioneer species and the intermediate species.

Secondary secession

The ecological secession that occurs on a preexisting soil after the primary secession has been disrupted or destroyed due to a disturbance that reduced the Population of the initial inhabitants.

Species decline

Habitat loss

Invasive species


Population growth (Human)

Over exploitation of plants/animals