Ecosystem

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ecosystem and its basic concepts

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Ecosystems: Basic Concepts:

Presented by M.S.Ulfath Fahima Ecosystems : Basic Concepts

contents:

contents The concept of ecosystem Kinds of ecosystem Structure of an ecosystem Pond as an example of ecosystem Functions of ecosystem Flow of energy

The concept of ecosystem:

Ecosystem: Basic functional unit in ecology Includes living (biotic) and non living (abiotic) organisms Each ecosystem has distinct community with a distinct environment The concept of ecosystem

Kinds of ecosystem:

Kinds of ecosystem

Structure of an ecosystem:

Structure of an ecosystem

Biotic components:

Biotic components Autotrophs - Producers Heterotrophs - Consumers Primary consumers Secondary consumers Tertiary consumers Micro consumers

Biotic Components Flow chart:

Biotic Components Flow chart

Autotrophs producers:

Autotrophs producers

Examples:

Examples Green plants Euglena cosmorium Chemosynthetic Bacteria Photosynthetic bacteria

Heterotrophs:

Heterotrophs

Heterotrophs:

Heterotrophs Primary consumers Herbivorous animals dependent on green plants

Heterotrophs:

Heterotrophs Secondary consumers Animals that are dependent on Herbivorous for food

Heterotrophs:

Heterotrophs Tertiary consumers Carnivores which feed on secondary consumers

Heterotrophs:

Heterotrophs

Parasites:

Parasites They obtain food directly from other organism of all trophic levels Micro consumers

Example:

Example Micro consumers Parasites

Detrivores and scavengers:

Detrivores and scavengers Detrivores feed on organic fragments Scavengers feed on dead bodies They are essential for quick break down of dead bodies of organisms Micro consumers

Example:

Example Micro consumers Detrivores and scavengers Vulture

Decomposers:

Decomposers Breakdown the complex compounds of dead or living protoplasm Absorb some of the decomposition products Release inorganic nutrients which are cycled back to the soil and the atmosphere Play important role in maintaining the dynamic nature of ecosystem Micro consumers

Example:

Example Micro consumers Bacteria and fungi

Abiotic components:

Abiotic components

Abiotic components:

Abiotic components

Abiotic components:

Abiotic components

Abiotic components:

Abiotic components These are substances that are dispersed from the dead bodies of organisms are derived from their excretions The various organic substances are collectively known as humus (contains carbohydrates, proteins, lipids, amino acids and nucleic acids) It link the biotic components with the abiotic components Organic substances

Abiotic components:

Abiotic components Physical factors It includes climatic, edaphic and topographic factors

Pond as an example of ecosystem:

Pond as an example of ecosystem

Flow of Energy:

Flow of Energy The greatest amount of energy is found at the base of the pyramid. The least amount of energy is found at top of the pyramid.

Reference:

Reference www.csun.edu/science/scale/4th_grade/ppt/energy_ecosystem.ppt http://eeb.bio.utk.edu/weltzin/GenEcol03/Lecture/lc_11-18-03_ecosystems.ppt Environmental studies Editors : Dr. Jayamani. K and Dr. Lethi

Thank you:

Thank you

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