Ecosystem, Biodiversity and Conservation

Ecosystem, Biodiversity and Conservation

Ecosystem

Concept of Ecosystem

• Ecosystem is a functional unit of nature in which living organisms interact with one another and with the non-living environment.
• The term ecosystem was introduced by A. G. Tansley in 1935.
• An ecosystem includes:
• Biotic components – living organisms.
• Abiotic components – non-living physical and chemical factors.
• Examples:
• Forest
• Pond
• Lake
• River
• Grassland
• Desert
• Ocean
• Agricultural ecosystem

Characteristics of an Ecosystem

1. Interaction between biotic and abiotic components
• Plants, animals and microorganisms interact with soil, water, air, sunlight and temperature.
2. Energy flow
• Energy mainly enters an ecosystem through sunlight.
• It flows from producers → consumers → decomposers.
3. Nutrient cycling
• Nutrients such as carbon, nitrogen, phosphorus and water circulate between living and non-living components.
4. Food relationships
• Organisms are connected through food chains and food webs.
5. Dynamic nature
• Ecosystems continuously change due to natural and human influences.
6. Self-regulation
• Ecosystems have mechanisms that help maintain relative stability.
7. Interdependence
• Organisms depend on each other for food, shelter, pollination, decomposition and other ecological functions.
8. Productivity
• Ecosystems produce biomass through photosynthesis and other biological processes.

Structure of an Ecosystem

. Abiotic Components

These are the non-living components.

Physical factors

• Sunlight
• Temperature
• Rainfall
• Humidity
• Wind
• Soil
• Water

Chemical factors

• Oxygen
• Carbon dioxide
• Nitrogen
• Minerals
• Salts
• pH
• Nutrients

B. Biotic Components

·       Living organisms are generally divided into three groups:

1. Producers

• Mainly green plants and algae.
• Produce food through photosynthesis.
• Form the first trophic level.
• Examples:
• Trees
• Grass
• Algae
• Phytoplankton

2. Consumers

Organisms that obtain food from other organisms.

Primary consumers

• Herbivores
• Feed directly on plants.
• Examples: deer, rabbit, cattle.

Secondary consumers

• Feed on herbivores.
• Examples: frogs, small fish, snakes.

Tertiary consumers

• Feed on secondary consumers.
• Examples: eagle, tiger, large predatory fish.

3. Decomposers

• Break down dead plants, animals and organic waste.
• Return nutrients to the environment.
• Main examples:
• Bacteria
• Fungi

Functions of an Ecosystem

1. Energy Flow

• Solar energy is captured by producers.
• Energy passes through different trophic levels.
• Energy flow is unidirectional.
• Some energy is lost as heat at each trophic level.

Basic flow:

Sun → Producers → Primary Consumers → Secondary Consumers → Tertiary Consumers

2. Nutrient Cycling

• Nutrients are continuously recycled between organisms and the environment.
• Important cycles include:
• Water cycle
• Carbon cycle
• Nitrogen cycle
• Phosphorus cycle

3. Productivity

• Primary productivity: production of organic matter by producers.
• Gross Primary Productivity (GPP): total food produced by producers.
• Net Primary Productivity (NPP): food remaining after producers use some energy for respiration.

4. Decomposition

• Dead organic matter is broken down by decomposers.
• Main processes:
• Fragmentation
• Leaching
• Decomposition
• Humification
• Mineralization

5. Ecological Regulation

• Predation, competition and other interactions help regulate populations.
• These processes contribute to ecosystem stability.

Types of Natural Ecosystems

A. Terrestrial Ecosystems

Found on land.

Major types:

1. Forest ecosystem
2. Grassland ecosystem
3. Desert ecosystem
4. Tundra ecosystem

B. Aquatic Ecosystems

Found in water.

Freshwater ecosystems

• Ponds
• Lakes
• Rivers
• Streams
• Wetlands

Marine ecosystems

• Oceans
• Seas
• Coral reefs
• Estuaries

Ecological Characteristics of Major Ecosystems

A. Forest Ecosystem

• Dominated by trees.
• High biomass and biodiversity.
• Different layers are present:
• Canopy
• Understory
• Shrub layer
• Forest floor
• Provides:
• Oxygen production
• Carbon storage
• Soil protection
• Wildlife habitat
• Climate regulation

B. Grassland Ecosystem

• Dominated mainly by grasses.
• Trees are relatively fewer.
• Supports herbivores and grazing animals.
• Regular grazing and natural fires can influence its structure.
• Important for:
• Livestock
• Soil conservation
• Carbon storage

C. Desert Ecosystem

• Very low rainfall.
• High evaporation.
• Large temperature variations may occur.
• Plants and animals have special adaptations to conserve water.
• Examples:
• Cactus
• Thorny shrubs
• Camels
• Reptiles

D. Aquatic Ecosystem

• Water is the major environmental factor.
• Organisms are adapted to aquatic conditions.
• Includes:
• Freshwater ecosystems
• Marine ecosystems
• Important for:
• Fisheries
• Water supply
• Biodiversity
• Climate regulation

Biodiversity

• Biodiversity means the variety and variability of living organisms and the ecological systems in which they occur.
• It includes diversity:
• Within species
• Between species
• Of ecosystems

Levels of Biodiversity

1. Genetic Diversity

• Variation in genes within the same species.
• Helps populations adapt to changing environmental conditions.
• Example:
• Different varieties of rice
• Different breeds of cattle

2. Species Diversity

• Variety of different species in an area.
• Includes both:
• Number of species
• Relative abundance of species

3. Ecosystem Diversity

• Variety of ecosystems in a geographical region.
• Examples:
• Forests
• Wetlands
• Deserts
• Grasslands
• Coral reefs

Importance of Biodiversity

Ecological importance

• Maintains ecosystem stability.
• Supports food chains and food webs.
• Helps nutrient cycling.
• Supports pollination and decomposition.
• Contributes to soil formation and fertility.

Economic importance

• Provides food.
• Provides medicines.
• Provides timber and fibres.
• Supports agriculture and fisheries.
• Supports tourism and ecotourism.

Social and cultural importance

• Many species have cultural and religious significance.
• Supports traditional knowledge and local livelihoods.

Scientific importance

• Provides material for research.
• Helps scientists study evolution and ecological processes.

Future value

• Species may contain genetic resources useful for future:
• Medicines
• Crops
• Biotechnology
• Climate adaptation

Biodiversity-Rich Regions

·       Areas containing exceptionally high biodiversity are often called biodiversity hotspots when they meet specific criteria of high endemism and significant habitat loss.

Major biodiversity-rich regions include:

• Tropical rainforests
• Coral reefs
• Tropical islands
• Mountain ecosystems
• Wetlands
• Certain tropical and subtropical regions

Biodiversity Hotspots in India

India contains parts of four global biodiversity hotspots:

1. Himalaya
2. Indo-Burma
3. Western Ghats–Sri Lanka
4. Sundaland — represented in India mainly by the Nicobar Islands

Threats to Biodiversity

1. Habitat Loss

• Destruction or conversion of natural habitats.
• Causes:
• Urbanization
• Agriculture
• Mining
• Roads
• Industries
• Dams

2. Habitat Fragmentation

• Large habitats are divided into smaller isolated patches.
• Reduces movement and breeding opportunities for wildlife.

3. Overexploitation

• Excessive use of biological resources.
• Examples:
• Overfishing
• Excessive hunting
• Illegal logging

4. Invasive Alien Species

• Non-native species may spread rapidly and compete with native species.
• They can alter ecosystem structure and functions.

5. Pollution

Includes:

• Air pollution
• Water pollution
• Soil pollution
• Plastic pollution
• Pesticide pollution

6. Climate Change

• Changes temperature and rainfall patterns.
• Can alter species distribution and breeding patterns.
• Increases pressure on vulnerable ecosystems.

7. Illegal Wildlife Trade

• Animals and plants may be captured or collected for commercial purposes.
• Can reduce wild populations.

Causes of Biodiversity Loss

• Population growth
• Urbanization
• Industrialization
• Deforestation
• Unsustainable agriculture
• Mining
• Infrastructure development
• Overfishing
• Hunting
• Pollution
• Climate change

Ecosystem Resilience

• Resilience is the ability of an ecosystem to withstand disturbance and recover while retaining its essential structure and functions.

Examples

• A forest recovering after a moderate wildfire.
• A grassland recovering after temporary grazing pressure.

Factors affecting resilience

• Biodiversity
• Genetic diversity
• Availability of resources
• Habitat connectivity
• Soil quality
• Natural regeneration
• Disturbance intensity and frequency

Importance

• Helps ecosystems cope with:
• Climate change
• Pollution
• Drought
• Fires
• Human disturbances

Homeostasis

• Homeostasis refers to the tendency of an ecosystem to maintain a relatively stable internal condition despite changes in the surrounding environment.

Examples

• Predator and prey populations regulating each other.
• Decomposition returning nutrients to soil.
• Vegetation influencing moisture and temperature.

Importance

• Maintains ecological balance.
• Prevents extreme population fluctuations.
• Supports long-term ecosystem functioning.

Carrying Capacity

• Carrying capacity is the maximum population size of a species that an environment can sustainably support under given conditions.

It depends on:

• Food availability
• Water availability
• Space
• Shelter
• Nutrients
• Predation
• Disease
• Competition
• Environmental conditions

Example

·       If a grassland has enough food and water to sustainably support 500 deer, its carrying capacity for deer under those conditions would be approximately 500.

Importance

• Helps prevent overuse of natural resources.
• Important for:
• Wildlife management
• Fisheries
• Agriculture
• Livestock management
• Sustainable development

Biodiversity Conservation

• Biodiversity conservation means protecting, maintaining and sustainably managing the variety of life and the ecosystems that support it.

Main objectives

• Protect species from extinction.
• Preserve genetic diversity.
• Protect natural habitats.
• Maintain ecosystem functions.
• Promote sustainable use of biological resources.
• Restore degraded ecosystems.

Principles of Biodiversity Conservation

1. Conservation of habitats

• Protect natural habitats instead of focusing only on individual species.

2. Sustainable use

• Resources should be used at a rate that allows natural regeneration.

3. Prevention of extinction

• Threatened and endangered species should receive special protection.

4. Ecosystem approach

• Conservation should consider the entire ecosystem and its interactions.

5. Genetic conservation

• Genetic variation should be maintained within species.

6. Community participation

• Local communities should be involved in conservation and sustainable resource management.

7. Scientific management

• Conservation decisions should be supported by research, monitoring and ecological data.

Methods of Biodiversity Conservation

In-situ Conservation

• In-situ conservation means conserving species in their natural habitats.

Examples

• National Parks
• Wildlife Sanctuaries
• Biosphere Reserves
• Community reserves
• Conservation reserves
• Protected forests

Advantages

• Protects entire ecosystems.
• Conserves many species simultaneously.
• Maintains natural interactions.
• Allows natural evolution and adaptation.
• Protects habitats along with species.

Examples in India

• Jim Corbett National Park
• Kaziranga National Park
• Gir National Park
• Kanha National Park
• Nilgiri Biosphere Reserve

Ex-situ Conservation

• Ex-situ conservation means conserving species outside their natural habitats under controlled or managed conditions.

Methods

1. Zoos
2. Botanical gardens
3. Seed banks
4. Gene banks
5. Pollen banks
6. Tissue culture
7. Cryopreservation
8. Captive breeding

Advantages

• Protects species at very high risk in the wild.
• Allows controlled breeding.
• Helps preserve genetic material.
• Supports research and education.
• Can support reintroduction into natural habitats.

Limitation

• Usually protects selected species or genetic material rather than the entire natural ecosystem.

Nature Reserves and Protected Areas

1. National Parks

• Strong protection is provided to wildlife and natural ecosystems.
• Human activities are highly regulated.

Example: Jim Corbett National Park.

2. Wildlife Sanctuaries

• Established mainly for protection of wildlife and habitats.
• Certain regulated human activities may be permitted depending on the legal framework.

3. Biosphere Reserves

• Large areas designed to combine:
• Biodiversity conservation
• Sustainable development
• Research and education

They generally have:

• Core zone
• Buffer zone
• Transition zone

4. Conservation Reserves

• Areas important for conservation, often including habitats connecting protected areas.

5. Community Reserves

• Conservation areas where local communities and private stakeholders can have an important role in management.

India as a Mega-Diverse Nation

·       India is considered one of the world's megadiverse countries because of its exceptionally high biological diversity and significant levels of endemism.

Reasons for India's high biodiversity

1. Wide geographical diversity
• Himalayas
• Deserts
• Plains
• Plateaus
• Coastal areas
• Islands
2. Different climatic conditions
• Tropical
• Subtropical
• Temperate
• Alpine
3. Variety of ecosystems
• Forests
• Grasslands
• Wetlands
• Deserts
• Mangroves
• Coral reefs
• Marine ecosystems
4. High species diversity
5. High endemism
• Some species are naturally found only in particular geographical regions.
6. Rich genetic diversity
• Numerous crop varieties, livestock breeds and wild relatives.

Important biodiversity regions of India

• Himalayas
• Western Ghats
• North-East India
• Andaman and Nicobar Islands
• Sundarbans
• Desert ecosystems
• Coastal and marine ecosystems

Importance of India's biodiversity

• Provides food and medicines.
• Supports agriculture.
• Maintains ecosystem services.
• Supports livelihoods.
• Provides genetic resources.
• Has cultural and traditional importance.
• Supports tourism and ecotourism.

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