Walk from a scorching desert into a cool, mossy forest in your imagination, and it feels like stepping into a whole new world. The plants change, the animals change, even the smell of the air is different. That simple feeling of “this place is nothing like that other place” is at the heart of the question many people ask, what is a biome.
When we ask what is a biome, we are really asking how Earth sorts life into giant neighborhoods. Each of these huge regions has its own climate, typical plant life, and animal communities that fit together like pieces of a puzzle. From rainforests packed with life to frozen tundra where only the toughest species survive, biomes help explain why certain animals live where they do and how they manage it.
In this guide, we will walk through what a biome is, how scientists classify biomes, and what makes the main types of land and water biomes so special. We will also look at how humans have reshaped many natural areas and how climate change is already shifting these large communities of life. By the end, you will be able to look at any region on Earth, ask what is a biome in that place, and answer with confidence, curiosity, and a deeper sense of care for the living world.
Key Takeaways
Understanding a few key ideas makes the big question of what is a biome much easier to handle. This short list gives a quick map of the main points in this guide.
A biome is a huge region of the planet with a certain climate, typical plant life, and animal communities that fit those conditions. It is like a giant neighborhood where living things share the same long‑term weather patterns and physical setting.
Nonliving factors such as temperature, rainfall, soil, light, and water availability shape different biomes. These physical conditions decide which plants can grow and which animals can survive there.
Well‑known biomes include tropical rainforests, temperate forests, boreal forests, grasslands, deserts, tundra, freshwater areas, and marine environments such as oceans and coral reefs.
Scientists use several classification systems to answer what is a biome in a clear way. They may group biomes differently, but they agree on the main types and their basic traits.
Human activity has reshaped many natural areas into “anthropogenic biomes” such as cities, croplands, and rangelands, where people play a strong role in how plants and animals live.
Climate change is already shifting where biomes are found, with some regions warming, drying, or flooding in ways that change which communities of life can stay there.
Learning about biomes helps students, educators, nature fans, and families understand animal habitats, plan conservation actions, and make better choices for the living world.
What Is A Biome? Understanding Earth’s Ecological Communities
When I answer the question what is a biome, I start with a simple idea. A biome is a large region of Earth where the climate, typical plants, and animal communities match each other in a fairly consistent way. A tropical rainforest in South America and one in Southeast Asia are on different continents, but they share warm temperatures, heavy rainfall, tall evergreen trees, and rich animal life, so they belong to the same biome type.
Biomes form because living things respond to nonliving conditions. Temperature, rainfall, soil type, sunlight, and water supply shape what kinds of plants can grow in a region. Those plants then provide food and shelter for certain animals, so entire communities of life build up around the same basic physical setting. In other words, when we ask what is a biome, we are really talking about how climate and environment shape life over huge areas.
The idea of linking living communities to climate was sharpened in the early twentieth century, as shown in A guide to human microbiome research, which traces how scientists developed frameworks for understanding ecological communities. In 1935, botanist Arthur Tansley described the tight link between plants, animals, climate, and soil and introduced a name for that kind of ecological unit, while other scientists used “biome” for very large climate–vegetation zones across the globe. Later projects, such as the International Biological Program during the mid‑twentieth century, helped standardize the way scientists spoke about these broad regions.
Different countries sometimes use the word biome in slightly different ways:
In some writing from Germany, biome can mean a very local natural unit, close to what others call a “biotope”.
In some Brazilian research, biome can mean a large province with its own mix of species.
In this guide, when I answer what is a biome, I use the more common international meaning, where a temperate grassland in North America and one in Asia belong to the same biome because they share climate and structure, even though the exact species may differ.
At Know Animals, this idea matters because every species we study lives inside one or more biomes. When we learn what is a biome for a given animal, we can better understand its habitat, its behavior, and the challenges it faces as its home conditions shift.
“The history of life on Earth has been a history of interaction between living things and their surroundings.”
— Rachel Carson, Silent Spring (1962)
Why Classifying Biomes Is More Complicated Than It Seems
At first glance, the question what is a biome sounds like it should have a simple answer and a fixed list. In practice, sorting the whole planet into neat boxes is tricky. Nature does not draw sharp lines. Conditions such as rainfall, temperature, and soil change gradually from place to place, and so do the plant and animal communities. The shift from forest to grassland or from grassland to desert often happens over wide transition zones rather than at clear borders.
Because of this, any map that shows borders between biomes uses average, long‑term conditions and makes choices about where to draw lines. Two nearby valleys might have different soil moisture or wind patterns, even if they lie inside the same broad biome on a map. So when we talk about what is a biome in a scientific sense, we are already talking about a simplified picture of something that, on the ground, is more of a sliding scale.
Scientists also use different rules for grouping regions:
Some systems focus mostly on climate measurements such as temperature and rainfall.
Others lean more on dominant plant types, for example tall trees compared with grasses or shrubs.
Some put more weight on the exact mix of species in each area.
This is why one book may list six major biomes, while another lists eight, eleven, or more.
A famous study of North American grasslands in the late twentieth century showed how water and energy shape plant growth. The researchers found that rainfall and water use mainly controlled the amount of plant matter above ground, while sunlight and temperature had stronger effects on roots below ground. Studies like this help explain why different classification systems choose slightly different factors to answer what is a biome in a given place.
This variety in systems does not make biome maps useless. Instead, it shows that Earth’s living communities are rich and interconnected. Even if the exact number of biomes changes from one system to another, they share agreement on the main types and their important features.
How Scientists Classify Biomes: Major Classification Systems
Whittaker’s Biome Types: The Temperature And Precipitation Framework
One of the clearest ways scientists have answered what is a biome comes from ecologist Robert Whittaker. In the 1960s and 1970s, he studied how plant communities change along natural gradients such as wetter to drier and warmer to colder areas. This approach, called gradient analysis, looks at shifts in community structure as conditions change step by step.
Whittaker focused on four main gradients. He looked at:
how wet or dry coastal zones are between high and low tide,
how climates change from very moist to very dry,
and how temperature changes with both altitude and latitude.
When he placed average yearly temperature on one axis of a graph and average yearly rainfall on the other, clear clusters appeared. Each cluster lined up with a well‑known biome type, such as tropical rainforest, temperate forest, grassland, or desert.
From this work, Whittaker also noted some broad patterns. As conditions move from comfortable to harsh:
plant productivity tends to drop,
community structure becomes simpler with fewer layers of vegetation,
and the number of species falls.
He also used helpful terms. A formation is a major kind of plant community on one continent. A biome is that plant community together with its animals. A biome type is a group of similar biomes found on several continents but sharing the same general climate and structure.
The WWF Biogeographical Framework: A Conservation Focused Approach
Another powerful answer to what is a biome comes from the World Wildlife Fund (WWF), which built a system to guide conservation work. This framework divides the land part of the planet into several levels, starting broad and then zooming in.
At the widest scale, it recognizes eight large realms such as:
the Nearctic, which covers North America,
the Palearctic, which includes Europe and much of Asia,
and the Neotropic, which covers most of South and Central America,
along with other realms in Africa, Asia, and Oceania.
Inside each realm, the WWF system maps out many ecoregions. These are large areas that share a recognizable mix of natural communities and environmental conditions. Each ecoregion is then linked to a primary biome, which the WWF calls a major habitat type. Using this approach, the organization identifies fourteen main land‑based biomes, along with twelve freshwater types and five marine types.
This framework is especially helpful for conservation planning. It allows scientists and policy makers to compare, for example, a threatened grassland in South America with one in Asia and decide which areas need attention first. For us at Know Animals, this way of answering what is a biome connects directly to the species we cover, since many conservation projects focus on protecting whole biomes or ecoregions rather than single sites.
Other Important Classification Models
Several other systems add more ways to think about what is a biome and how to sort the planet’s living communities. The Holdridge life zone model, created in the 1940s, uses three main climate measurements—temperature, rainfall, and water loss to the air—to define about thirty climate‑based zones. Heinrich Walter’s zonobiome system, developed in the 1970s, groups regions into nine main types based on the timing of warm, cold, wet, and dry seasons. These and similar models do not clash with each other. Instead, they highlight different features of the same natural patterns.
The Major Terrestrial Biomes: From Rainforests To Tundra
Before looking at each land biome in detail, it helps to see them side by side. The table below gives a quick overview.
Terrestrial Biome | Typical Climate | Example Regions |
|---|---|---|
Tropical & Subtropical Moist Broadleaf Forests | Warm, very wet, little seasonal change | Amazon, Congo Basin, Southeast Asia |
Temperate Broadleaf & Mixed Forests | Moderate, four seasons | Eastern US, Europe, East Asia |
Boreal Forests (Taiga) | Long, cold winters; short, cool summers | Canada, Alaska, Scandinavia, Siberia |
Grasslands, Savannas, & Shrublands | From cool temperate to warm tropical; seasonal rainfall | Prairies, steppes, African savannas |
Deserts & Xeric Shrublands | Very dry; hot or cold | Sahara, Arabian Desert, Gobi, Sonoran |
Tundra | Very cold; low precipitation | Arctic coastal zones, high mountain tops |
Tropical And Subtropical Moist Broadleaf Forests: Tropical Rainforests
When many people first ask what is a biome, the tropical rainforest is the picture that comes to mind. These forests lie near the equator in regions such as the Amazon Basin, the Congo Basin, and parts of Southeast Asia. They stay warm all year, with high humidity and heavy rainfall in most months.
Key features include:
Tall evergreen trees forming several layers, from the dark forest floor up to a sunlit canopy and an even taller emergent layer.
Sunlight barely reaching the ground, so many plants grow as vines or epiphytes on tree trunks and branches.
Extremely high biodiversity, with more species of plants and animals than any other land biome.
Many animals, from monkeys and sloths to bright birds and frogs, live high in the trees and use intense colors or special calls to find mates and defend territories. At Know Animals, we use this biome to show how narrow feeding roles and unusual body shapes can help species survive in crowded environments.
Temperate Broadleaf And Mixed Forests
Temperate broadleaf and mixed forests give a more familiar answer to what is a biome for many people in North America, Europe, and parts of Asia. These regions sit in mid‑latitudes and have four clear seasons, including cold winters with freezing temperatures and warm summers.
Common traits include:
Deciduous trees such as oak, maple, and beech that lose their leaves in autumn, creating thick layers of leaf litter that rot and form fertile soil.
In some areas, evergreen conifers mix in, adding green color through winter.
Deer, foxes, bears, songbirds, and many small mammals using these forests through the year.
Animals here often migrate, hibernate, or grow thicker coats to handle the seasonal swings.
Boreal Forests: Taiga
Farther north, the answer to what is a biome shifts to the boreal forest, also called the taiga. This is the largest land biome on Earth, wrapping across Canada, Alaska, Scandinavia, and Russia in a wide belt. Winters here are long, dark, and very cold, while summers are short and cool.
This biome is marked by:
Evergreen conifers such as spruce, pine, and fir with narrow needles that shed snow and reduce water loss.
Soil that is often acidic and poor in nutrients because needle litter breaks down slowly in the cold.
Animals such as moose, wolves, lynx, snowshoe hares, and several owl species showing adaptations like thick fur, large feet for moving on snow, and seasonal color changes for camouflage.
Grasslands, Savannas, And Shrublands
Grasslands, savannas, and shrublands together answer what is a biome in many open, treeless or low‑tree regions.
Temperate grasslands, such as the North American prairies and Eurasian steppes, lie in continental interiors where summers can be hot and winters cold. Rainfall is moderate, enough for grasses and wildflowers but usually not for tall forests. Their deep, rich soils have made many of these areas prime farmland, so wild grazing herds such as bison have shrunk in range.
Tropical savannas, common in parts of Africa, South America, and Australia, mix grasses with scattered trees and shrubs. They have clear wet and dry seasons, and support famous large animals such as elephants, zebras, antelope, and lions.
Shrublands, including Mediterranean‑style scrub, grow in places with hot dry summers and mild wet winters. Plants often have small thick leaves or waxy coatings to reduce water loss, and many can resprout after fire.
Open ground favors fast‑moving grazers, burrowing rodents, and predators built for speed. On Know Animals, we often compare how deer and other herbivores handle grassland winters versus milder savanna or scrub climates.
Deserts And Xeric Shrublands
Deserts and other very dry shrublands give a stark answer to what is a biome where water is scarce. These regions usually receive less than about ten inches of rain in a year.
Hot deserts such as the Sahara have blazing days and surprisingly cool nights.
Cold deserts such as the Gobi have lower temperatures but still very little moisture.
Plants are sparse and often include succulents with thick water‑storing tissues, deep‑rooted shrubs, and annuals that sprout only after rare rains. Many animals rest in burrows during the day, hunt or feed at night, and show strong water‑saving tricks such as concentrated urine and dry feces. Species numbers are lower than in wetter biomes, but the ones that live here show remarkable fine tuning to survive heat and drought.
Tundra
At the coldest edges of the planet, tundra gives our final land‑based answer to what is a biome. This treeless region spreads across the Arctic and appears high on mountains as alpine tundra. Winters are very long, bitterly cold, and dark, while summers are short and cool.
Typical features are:
Low precipitation, yet ground that often stays wet in summer because water cannot drain through a layer of permafrost, permanently frozen soil, just below the surface.
Only low plants such as mosses, lichens, small grasses, and dwarf shrubs can grow.
Animals such as caribou, arctic foxes, snowy owls, and polar bears either migrating in and out or relying on dense fur and fat layers to survive the cold.
Tundra is already feeling strong effects from climate warming, which threatens to thaw permafrost and change this biome into something very different.
Aquatic Biomes: Freshwater And Marine Environments
When we ask what is a biome, we should not stop at dry land. Water‑based biomes cover most of Earth’s surface and hold most of its living volume. Scientists usually divide them into freshwater and marine types based on salt content. Freshwater bodies such as lakes and rivers hold very little salt, while marine environments such as oceans have high salt levels and follow different physical rules.
Freshwater Biomes: Rivers, Lakes, And Wetlands
Freshwater biomes answer what is a biome wherever water has very low salt concentration. These areas supply drinking water, crop irrigation, and many other human needs, but they also host rich natural communities.
Key freshwater types include:
Lakes and ponds: standing bodies of water that often show layers based on depth and temperature, with warmer surface water in summer and colder bottom water. These layers can mix seasonally, sharing oxygen and nutrients.
Rivers and streams: flowing water moving from higher ground toward seas or inland basins, with current speed, width, and depth changing along the way. Fast headwaters favor streamlined fish and clinging insects, while slower lower reaches support more plants and plankton.
Wetlands: swamps, marshes, and bogs where land stays saturated for much of the year. They are among the most productive habitats on the planet, serving as breeding grounds and nurseries for fish, amphibians, birds, and insects.
River deltas: areas where rivers slow and spread out near their mouths, dropping sediment and building maze‑like channels and islands.
Freshwater types also vary by region, from polar lakes and streams to high mountain waterways and rare pools in arid areas. Pollution, dams, and water diversion threaten many of these systems. On Know Animals, we highlight frogs, beavers, wading birds, and many fish whose lives are tightly tied to these watery homes.
Marine Biomes: Oceans, Coral Reefs, And Deep Sea
Marine biomes answer what is a biome across more than two thirds of Earth’s surface. Saltwater, waves, and great depth shape these environments.
Near coasts and over continental shelves, the water is relatively shallow and sunlight can reach the bottom. These zones are rich in nutrients and support heavy growth of algae and sea grasses, which feed fish, invertebrates, and larger animals. The intertidal zone, between high and low tide lines, forces organisms to handle both air and water, pounding waves, and rapid changes in temperature and salinity. Estuaries and salt marshes form where rivers meet the sea. Here, mixed fresh and salt water creates nurseries where many fish and shellfish spend their early life stages.
Farther offshore, the open ocean stretches as a broad pelagic zone. Sunlight reaches only the upper layer, where drifting plankton carry out photosynthesis and feed small fish, which in turn feed larger predators such as tuna, sharks, and whales. Below this sunlit zone, the water grows dim and then dark, cold, and high in pressure. On the seafloor, in the deep benthic and abyssal zones, strange animals live on falling organic matter or cluster around hydrothermal vents and cold seeps, where chemical‑rich fluids rise from below.
Coral reefs, built by tiny coral animals in warm, clear, shallow waters, are famous for their high species richness and dense networks of life. Marine biomes face many threats, including overfishing, plastic and chemical pollution, rising temperatures, and ocean acidification, all of which we discuss in our marine species guides on Know Animals.
Anthropogenic Biomes: How Humans Have Reshaped Earth’s Environments
As cities grow, farms spread, and roads cut across wild areas, the answer to what is a biome looks different from past natural maps. Many scientists now speak of anthropogenic biomes, or anthromes, which are large regions shaped strongly by long‑term human activity. In these areas, people are not just visitors. Human land‑use patterns, from farming to building, help decide which plants and animals can live there.
Traditional biome maps might label a region as temperate forest, but if most of that area is now suburban housing, farm fields, and managed woods, the old label no longer shows the current reality. The anthrome idea steps in to answer what is a biome under heavy human influence. It sorts land into types such as dense settlements, croplands, rangelands, and human‑influenced forests.
Dense settlements cover cities and suburbs, where paved surfaces, lawns, and ornamental plants replace most native vegetation.
Croplands focus on growing food or fiber, from irrigated fields to rain‑fed farms, often with single‑crop plantings.
Rangelands host grazing livestock such as cattle, sheep, or goats over large areas.
Forested anthromes include logged forests, tree plantations, and regrowing secondary woods where human decisions still guide structure and species.
Some scientists even point to indoor spaces as human‑created biomes, with their own climate control, lighting, and shared living communities of microbes, pets, and pests.
These human‑shaped biomes matter a lot for wildlife. As we explain on Know Animals, habitat loss and fragmentation push many species into smaller, broken pieces of their former range. Deer, for example, may wander through suburbs and along highways, raising the risk of vehicle collisions. Foxes, raccoons, and even coyotes learn to live in cities, feeding from trash or gardens. At the same time, well‑planned parks, green roofs, and wildlife corridors can help some species survive and even thrive in anthromes. When we ask what is a biome where people live and work, we need to think about how our daily choices support or damage the remaining animal communities around us.
The Hidden World Of Microbial Biomes
So far, when we have asked what is a biome, we have looked at big regions that we can walk through or see on a map. Microbial biomes remind us that tiny worlds also follow similar rules. A microbiome is a community of microscopic life, including bacteria, fungi, and viruses, that shares a particular environment, as documented by the BioMe BioBank Program, which has cataloged diverse microbial communities across different human populations. These communities live almost everywhere, from soil and water to the air and even inside the bodies of animals and humans.
One especially surprising answer to what is a biome at very small scales is the endolithic biome. Here, microbes live inside the pores and cracks of rocks, sometimes far below Earth’s surface. They survive on tiny amounts of water and chemical energy from minerals, in complete darkness and under high pressure. Conditions that would kill larger organisms still support these tiny life forms.
Traditional biome maps do not show these microscopic communities, yet they play key roles:
Soil microbiomes help cycle nutrients and support plant growth.
Gut microbiomes in animals, including people, help digest food, train immune systems, and protect against illness, with research from BioMe used to Identify new subpopulations showing how these microbial communities vary across different ethnic groups and influence disease risks.
Endolithic and other extreme microbiomes show just how wide the range of life can be, and raise questions about life on other planets, where harsh conditions may still allow microbial communities.
When we widen our view of what is a biome to include microbes, we see that Earth’s living patterns run from the largest forests to worlds hidden inside a single pebble.
Climate Change And The Future Of Biomes
When we ask what is a biome today, we also have to ask what it will look like for our children and grandchildren. Human‑driven climate change is shifting temperatures, rainfall patterns, and the timing of seasons across the globe. Since climate is one of the main forces that define biomes, these changes are starting to move biome boundaries and even create new combinations of conditions.
Scientists use computer models to explore how this might play out. Many studies suggest that by the end of this century, something like one fifth to over half of Earth’s land surface could feel climate conditions that match a different biome than the one found there now. A smaller but serious part of the planet may even face climate mixes that have no clear modern match. In simple terms, the answer to what is a biome in many places is likely to change.
A clear example is woody plant encroachment. In some grasslands and savannas, rising carbon dioxide levels, changes in fire frequency, and altered grazing patterns allow shrubs and trees to spread into areas once dominated by grasses. Over time, an open savanna can shift into a more closed woodland, changing shade levels, soil moisture, and fire behavior. This shift affects herbivores that rely on open sight lines and grasses, as well as predators that hunt in those spaces.
Some biomes face stronger pressure than others:
Arctic and high mountain regions are warming faster than the global average.
In tundra areas, thawing permafrost changes soil structure, releases greenhouse gases, and allows shrubs and trees to expand northward.
Forest biomes in many regions risk more frequent and intense fires as summers become hotter and drier, and trees may also face more pests and diseases.
In the sea, coral reefs are already suffering from bleaching when water gets too warm, killing corals and breaking down the complex reef structures so many species depend on.
For animals, these changes mean shifting ranges, altered food webs, and in some cases extinction if they cannot move or adapt fast enough. At Know Animals, we track how climate change affects species’ habitats, from polar bears on thinning ice to mountain pikas losing cool high‑altitude refuges. The good news is that human choices still matter. Supporting conservation groups, protecting and restoring habitats, building wildlife corridors, reducing greenhouse gas emissions, and speaking up for science‑based climate policy all help. The more we understand what is a biome and how climate shapes it, the better our chances of helping these large communities of life through rapid change.
Why Understanding Biomes Matters: Practical Applications
Knowing the answer to what is a biome is not just a school exercise. It affects how we see our local area, how we plan for the future, and how we care for other living things. Different groups of people can use biome knowledge in very direct ways.
Students and teachers: Biomes provide a backbone for lessons in biology, geography, and environmental science. Once students can answer what is a biome and name the main types, they can plug in lessons about food webs, nutrient cycles, and animal behavior within each one. Maps of biomes help connect far‑away places in textbooks to real conditions on the ground.
Wildlife watchers and nature fans: Knowing biome traits helps predict which species might appear on a hike or road trip. A traveler who understands the difference between desert, grassland, and temperate forest can better guess where to look for certain birds, mammals, or reptiles.
Gardeners and landowners: People who think in terms of local biome conditions can choose plants that match climate and support native animals such as pollinators and songbirds.
Conservation planners and climate researchers: Biome maps help set priorities by showing which habitat types are rare, heavily changed, or under strong climate stress. They also guide the design of protected areas and wildlife corridors and provide a framework for asking how warming or shifts in rainfall will play out in different regions.
At Know Animals, we use biome concepts to show how each species we cover fits into larger patterns and what threats it faces as those patterns shift. When readers understand what is a biome where they live, they often feel a stronger connection to their home area and a clearer sense of what actions—from backyard choices to voting—can help support the living communities around them.
“In nature nothing exists alone.”
— Rachel Carson, Silent Spring (1962)
Conclusion
Answering the question what is a biome opens a wide window on how life is arranged across our planet. Biomes are broad regions where climate, typical plants, and animal communities fit together in fairly stable patterns. Tropical rainforests, temperate woods, boreal forests, grasslands, deserts, tundra, freshwater bodies, and marine areas each show their own mix of conditions and living strategies.
From tall trees packed with climbing animals to bare rock holding only thin lichens, every biome plays an important role in keeping Earth’s systems running. Within each one, species have spent long spans of time adapting to local patterns of temperature, water, and soil. When we explore what is a biome in any region, we are really exploring how all those pieces work together.
Biomes are not fixed in place. Natural shifts in climate and disturbance already move their borders, and human activities such as land‑use change and climate warming are now pushing them faster and in new directions. That makes understanding biomes more important than ever. Knowing what is a biome where we live, and how it is changing, is a first step toward wiser choices.
At Know Animals, we invite readers to keep learning about the biomes that shape each species’ life, from familiar backyard birds to rare rainforest cats. The more clearly we see how these great living regions function, the better we can protect them. Earth’s biomes represent long histories of adjustment between life and environment, a natural heritage that deserves both our curiosity and our care.
FAQs
Question: How Many Biomes Are There In The World?
People often expect a single number when they ask what is a biome and how many types exist, but the count depends on the system used. Some simple school‑level models list about six main biomes, such as forest, grassland, desert, tundra, freshwater, and marine. More detailed systems may use eight to eleven, while the World Wildlife Fund’s framework counts fourteen major land‑based types. These different totals reflect varied scientific approaches, not deep disagreement over the main groups.
Question: What Are The 5 Main Biomes?
In many basic lessons, teachers answer what is a biome by focusing on five broad types. These are:
Forests, which include tropical, temperate, and boreal forms
Grasslands
Deserts
Tundra
A combined aquatic category that covers both freshwater and marine environments
This simple list gives a helpful starting point. More advanced systems then split each of these into finer types, such as savannas within grasslands or coral reefs within marine areas.
Question: What Is The Difference Between A Biome And An Ecological System?
It helps to compare scales when sorting out what is a biome versus what is an ecological system. An ecological system is a community of living things and their physical surroundings in a specific area, and it can be small, such as a pond, a log, or a backyard. A biome is much larger, covering wide regions that share similar climate, typical vegetation, and animal communities. Many smaller ecological systems fit inside a single biome. For example, the tropical rainforest biome includes river edges, canopy zones, and forest floor patches, each of which holds its own smaller community.
Question: Which Biome Has The Most Biodiversity?
When people ask what is a biome with the highest number of species, tropical rainforests almost always come out on top for land areas. Their warm, stable climate and year‑round rainfall support dense plant growth and many layers of habitat, which in turn support huge numbers of insects, birds, mammals, reptiles, and other groups. In the ocean, coral reefs play a similar role, often called rainforests of the sea because they hold so many different kinds of life in a relatively small area.
Question: How Does Climate Change Affect Biomes?
Climate change is reshaping the answer to what is a biome in many regions. Rising temperatures and altered rainfall patterns are changing the basic conditions that define each type of large community. Studies suggest that by the end of this century, a large part of Earth’s land surface may feel climate conditions that match different biome types than those found there today. Tundra areas face thawing permafrost, many forests risk more fires and pests, and coral reefs suffer bleaching as oceans warm. As biomes shift, animals may be forced to move, adapt, or face local extinction, which makes climate‑aware conservation efforts even more important.
