ENVIRONMENTAL SCIENCE

Srinivas Sakhamuri-Ph.D

Interactions in Ecosystem

Outcomes

Demonstrate an understanding of the interactions of biotic and abiotic elements in an ecosystem

Lesson Objectives

•Define biotic factors, abiotic factors and interactions.

•Identify the examples for biotic factors, abiotic factors and interactions.

Abiotic Component

A+BIOTIC

Without Life

Definition: component of an ecosystem without life is called as the abiotic component of the ecosystem.

Abiotic Components

Water Soil Sun Light Temperature Day Length Humidity Precipitation pH

Amount and type of nutrients

Oxygen Wind Seasonality Topography UV radiation Weather Climate

Biotic Component

Self nourishing

Synthesize food by photosynthesis/ Chemosynthesis

Eg: All green plants and some bacteria

Consumers Different types Primary(Herbivo

res) Secondary

Carnivores Tertiary

carnivores

Autotrophs Heterotrophs

DetrivoresDecompositionMineral cycling

Decomposers

Identify

Draw a square or circle on any componentSquare = Abiotic Circle = Biotic

Interactions

Study check

1. Dynamic equilibrium in an ecosystem is resultant ofa. Biotic factors b. Abiotic factors c. Both of them

2. Carbon dioxide is released into air bya. Plants b. Animals c. microbes d. All the above

3. Intra-actions in biotic factors leads toa. Equilibrium b. Energy flow c. Stability

4. Humidity in air is formed by the interaction ofa. Abiotic components b. Biotic componenttsc. Both of them d. None of them

Check your understanding

1. C 2. D 3. B 4. A

Summary