Biomes, Ecosystems, and Geographic Coordinates: Key Concepts for Biology and Geography

Latitude

The measurement of distance north or south of the Equator, expressed in degrees.

Longitude

The measurement of distance east or west of the Prime Meridian, expressed in degrees.

Tundra

A cold, treeless biome characterized by permafrost, low temperatures, and short growing seasons.

Permafrost

A permanently frozen layer of soil found in polar regions and high mountain areas.

Taiga

A biome characterized by coniferous forests, cold temperatures, and moderate precipitation.

Desert

A biome that receives less than 250 mm of rain per year, characterized by extreme temperatures and sparse vegetation.

Grasslands

Biomes dominated by grasses, with few trees, and characterized by moderate rainfall.

Chaparral

A biome characterized by hot, dry summers and mild, wet winters, often with shrubs and small trees.

Temperate Forest

A biome characterized by four distinct seasons, deciduous trees, and moderate rainfall.

Humus

A dark organic material in soil formed from the decayed remains of plants and animals.

Tropical Rain Forest

A warm, moist biome characterized by high biodiversity and dense vegetation, receiving over 2000 mm of rain annually.

Canopy

The upper layer of a forest formed by the tops of trees, providing habitat for many species.

Emergent Layer

The top layer of a rainforest where trees rise above the canopy, receiving the most sunlight.

Understory

The layer of vegetation beneath the canopy in a forest, consisting of smaller trees and shrubs.

Ground

The lowest layer of a forest, consisting of soil, decomposing matter, and small plants.

Alpine Communities

Ecosystems found in high mountain areas, characterized by cold temperatures and specialized vegetation.

Polar Ice

Areas covered by ice in polar regions, characterized by extreme cold and limited biodiversity.

Marine Ecosystems

Aquatic ecosystems that include oceans, coral reefs, and estuaries, characterized by saltwater.

Freshwater Ecosystems

Aquatic ecosystems that include lakes, rivers, and wetlands, characterized by low salt concentration.

Photic Zone

The upper layer of a body of water where sunlight penetrates, allowing photosynthesis.

Phytoplankton

Microscopic plant-like organisms that live in aquatic environments and perform photosynthesis.

Zooplankton

Microscopic animal-like organisms that drift in aquatic environments and feed on phytoplankton.

Aphotic Zone

The deeper layer of a body of water where sunlight does not penetrate, preventing photosynthesis.

Coral Reefs

Underwater structures made from calcium carbonate secreted by corals, known for high biodiversity.

Symbiotic Relationships

Interactions between two different organisms living in close physical proximity, often benefiting one or both.

Kelp Forests

Underwater ecosystems formed by large brown algae called kelp, providing habitat for diverse marine life.

Estuaries

Coastal areas where freshwater from rivers meets and mixes with saltwater from the ocean.

Salinity

The concentration of salt in water, which affects the types of organisms that can live in an ecosystem.

Lakes

Large bodies of freshwater surrounded by land, often supporting diverse ecosystems.

Shallow Water

Areas of water that are not deep, often rich in nutrients and biodiversity.

Wetlands

Ecosystems where water covers the soil for part of the year, including marshes, swamps, and bogs.

Bogs

Wetlands that accumulate peat, characterized by acidic waters and low nutrient levels.

Marshes

Wetlands dominated by herbaceous plants, often found at the edges of lakes and rivers.

Swamps

Wetlands dominated by woody plants, such as trees and shrubs, often found in floodplains.