Biomes

A biome is a large geographic region characterised by a distinct climate, soil, and vegetation, which in turn determines the types of animal species that inhabit the area. Biomes represent major life zones on Earth and help us understand how plants and animals adapt to different environmental conditions. A biome includes multiple ecosystems that are present in a particular geographical area. The biome is based on the climatic conditions and the availability of the type of vegetation. They are broadly classified into terrestrial biomes (land-based) and aquatic biomes (water-based).

Biomes can vary widely, from deserts to rainforests, and each supports a unique ecosystem with its own biodiversity. They play a crucial role in maintaining the balance of life on Earth and are essential for the survival of many species.

Terrestrial Biomes

The biomes that are present on land and consist of terrestrial ecosystems fall under the category of terrestrial biomes. These are tropical rainforest, temperate forest, desert, tundra, taiga, grasslands, and savanna.

1. Forest

A forest biome is a major terrestrial biome characterised by the predominance of trees and woody vegetation. Forests are found in regions with moderate to high rainfall and support the greatest diversity of plants and animals on Earth. They play a vital role in maintaining ecological balance and regulating the global climate.

Tropical rainforest

• Receives continuous rainfall of about 2000–2250 mm annually.
• Temperature ranges from 17°C to 25°C.
• Located near the equator in tropical regions.
• Contains the majority of terrestrial species.
• Climate remains warm and wet throughout the year.
• Soils are often nutrient poor despite dense vegetation.
• Trees can grow up to 50 meters or more.
• Supports a wide variety of animal species.
• Has the highest terrestrial biodiversity and biomass.

Temperate forest

• Abundance of deciduous trees.
• Located in the mid latitude regions, between the Arctic poles and the tropics.
• They receive an average rainfall ranging from 762 to 1524 millimetres and experience temperatures between -30°C and 30°C.
• Temperate deciduous forests undergo distinct seasonal changes, including spring, summer, autumn, and winter.
• Vegetation in these forests includes a variety of trees such as birch and oak, as well as herbs like ferns and grasses.
• The fauna of temperate deciduous forests is diverse, encompassing animals like bees, mosquitoes, frogs, snakes, hawks, owls, squirrels, and tigers.

Coniferous Forest

• Dense forest region located in the cold sub-arctic area.
• Annual precipitation in the Taiga ranges from approximately 380 to 1000 millimetres, with temperatures typically between -5°C and 5°C.
• Vegetation in the Taiga is specialised for cold climates and includes cone-bearing trees, needle-shaped leaves, and scaly-leaved trees.
• The Taiga biome supports a variety of animals adapted to cold environments, such as rodents, owls, moose, bears, and others.

Boreal Forest

• The boreal forest, also known as the taiga, is a major terrestrial biome found in the cold regions of the Northern Hemisphere.
• It lies between the tundra in the north and temperate forests in the south.
• This forest experiences long, cold winters and short, cool summers, with snowfall being common.
• Animals found in boreal forests include moose, wolves, bears, lynx, and migratory birds.

2. Grassland

The grassland biome is a terrestrial biome dominated by grasses and small shrubs, with very few trees. Grasslands develop in regions where rainfall is moderate too little to support forests but more than deserts. They play an important role in supporting grazing animals and maintaining ecological balance.

Temperate Grassland

• Found in tropical and temperate regions, and are dominated by grasses.
• They typically receive an annual rainfall ranging from 150 to 750 millimetres, which is insufficient to support the growth of trees.
• Vegetation in grasslands mainly includes grass, herbs, and shrubs.
• These areas are rich in herbivores and their predators, including top carnivores and reptiles.

Savanna Biome

• A type of grassland biome with a sparse distribution of tall trees.
• Characterised by a semi arid climate.
• Experiences distinct wet and dry seasons.
• Supports plant and animal biodiversity similar to grasslands.

3. Desert Biome

• Dry and hot or cold, with very little precipitation, often receiving around 254 millimetres or no rainfall at all.
• Hot deserts typically experience temperatures ranging from 45°C to 50°C, while cold deserts have temperatures that can drop to less than -30°C.
• Found in both sub-tropical and polar regions around the globe.
• Vegetation in deserts is sparse, consisting mainly of plants with thick or modified leaves that can store water and minimise water loss.
• Animal biodiversity in deserts is limited, with species adapted to survive in extreme desert conditions.

4. Tundra

• Snow covered region devoid of trees, primarily found in Polar Regions.
• Temperatures range from 3°C to less than -34°C, with minimal rainfall.
• Vegetation mainly comprises low shrubs, herbs, and mosses due to the harsh climate.
• Animal biodiversity is low in tundra biomes, with only species adapted to cold environments able to survive.

Aquatic Biome

The biomes that are present in the water and consist of aquatic ecosystems are called aquatic biomes. There are only two types of aquatic biomes: freshwater biomes and marine biomes.

1. Freshwater Biome

• A type of aquatic ecosystem.
• Includes freshwater bodies such as lakes, ponds, and rivers.
• Characterised by low or negligible salt content.
• Accounts for only about 2% of Earth’s total water.
• Supports a wide variety of aquatic plants, animals, and microorganisms.
• Serves as a vital water source for terrestrial organisms.

2. Marine Biome

• High salt concentrations.
• Accounts for 98% of the aquatic biome.
• Rich in biodiversity, with coastal regions harbouring the majority of species.

Factors that Make a Biome

• Physical and chemical condition of the soil, i.e. pH, texture, nutrients, etc.
• Climatic conditions like temperature, precipitation, etc.
• Vegetation, i.e. availability of herbs, shrubs, trees, etc.
• Wildlife, i.e. availability of insects, birds, fish, mammals, etc.

Biome vs Ecosystem

Significance of Biomes

• Biomes help us to understand how ecosystems differ from each other.
• Monitor changes occurring in various ecosystems.
• It helps to estimate the productivity of the ecosystems and the effect of climate change on them.
• To understand the type and significance of interactions with various plants and animals.
• The resources, habits, and habitats are dictated by the biome one lives in.
• Various ecological services like carbon sinks, natural resource reserves, etc., are unique to each biome.

Related Articles:

• Difference Between Ecosystem and Biome
• What are the Environment and Ecosystem?
• Energy Flow of Ecosystem