Ecosystem Components in Biology 2

Overview of Ecosystems

Definition of Ecosystem

• An ecosystem is a community of living (biotic) and non-living (abiotic) things that interact in a specific area.

• Examples of ecosystems include beaches, forests, lakes, and deserts, each with unique characteristics and interactions.

• Ecosystems can vary in size from small ponds to large forests, and they can be terrestrial or aquatic.

Components of Ecosystems

• Ecosystems consist of two main components: biotic (living) and abiotic (non-living).

• Biotic components include all living organisms such as plants, animals, fungi, and microorganisms.

• Abiotic components include non-living elements such as sunlight, water, air, minerals, and temperature.

Abiotic Factors in Ecosystems

Definition and Importance of Abiotic Factors

• Abiotic factors are the non-living parts of an ecosystem that influence the environment and the organisms within it.

• They play a crucial role in determining the types of organisms that can thrive in a particular ecosystem.

Types of Abiotic Factors

• Energy: The primary source of energy in ecosystems is sunlight, which is harnessed by plants through photosynthesis.

• Elements: Essential elements include macronutrients (proteins, carbohydrates, lipids) and micronutrients (salts, oxygen, water).

• Substrates: The physical environment where organisms live, such as soil, rocks, and water bodies.

Energy Flow in Ecosystems

Sources of Energy

• Radiant Energy: The energy from the sun that drives photosynthesis in plants, forming the base of the food chain.

• Chemical Energy: Stored in the bonds of molecules, which is released during metabolic processes in living organisms.

Energy Transfer in Ecosystems

• Energy flows through an ecosystem in a one-way stream, from primary producers (plants) to various levels of consumers (herbivores, carnivores).

• The efficiency of energy transfer between trophic levels is typically around 10%, leading to fewer organisms at higher