Major Causes of Spatial Variation in Natural Vegetation and Wildlife:
1. Climate and Weather:
- Temperature, precipitation, humidity, and sunlight determine the growth and distribution of plants and animals.
- Extreme temperatures, droughts, floods, and hurricanes can impact vegetation and wildlife populations.
2. Soil:
- Soil type, texture, pH, and fertility influence vegetation growth.
- Different soils support different plant communities and provide habitats for various wildlife.
3. Topography:
- Elevation, slope, and aspect affect sunlight exposure, temperature, and moisture availability.
- Mountains, valleys, and coastal areas create distinct vegetation zones and wildlife habitats.
4. Water Resources:
- Availability of water, such as rivers, lakes, or groundwater, determines the distribution of aquatic vegetation and wildlife.
- Wetlands, estuaries, and coral reefs support unique ecosystems.
5. Latitudinal Gradients:
- Sunlight intensity and temperature vary with latitude, creating climatic zones.
- Temperate, tropical, subtropical, and polar regions have distinct vegetation and wildlife assemblages.
6. Altitude:
- As altitude increases, temperature decreases and oxygen availability diminishes.
- Vegetation transitions from forests to grasslands, alpine meadows, and barren tundra.
- Wildlife species adapt to different altitude ranges.
7. Human Influence:
- Land use changes, such as deforestation, agriculture, and urbanization, alter vegetation and wildlife habitats.
- Hunting, fishing, and pollution can impact wildlife populations.
8. Biogeography:
- Evolutionary processes have resulted in distinct plant and animal species in different regions of the world.
- Biogeographic realms, such as Afrotropics, Nearctic, and Neotropics, have unique assemblages of species.
9. Ocean Currents:
- Ocean currents transport nutrients, plankton, and warm or cold water.
- They influence the distribution of marine vegetation and wildlife, creating productive fishing grounds and coastal ecosystems.
10. Continental Drift:
- Over geological time, continents have moved apart and collided, creating new landmasses and barriers to dispersal.
- This has led to the isolation of species and the development of unique ecosystems.