1. Fig. 50.18 Global Climate Patterns Regions of the globe can also be characterized by their abiotic conditions (e.g., climate)

2. Global Climate Patterns Climate broadly determines the traits of organisms found in a given location Fig. 50.18

3. Global Climate Patterns This climograph identifies major kinds of ecosystems (known as biomes) in North America Fig. 50.18

4. Global Climate Patterns The tropics are warm; the poles are cold

5. Global Climate Patterns The tropics are generally the wettest, latitudes around 30° are generally the driest, latitudes around 60° are wet, and polar latitudes are dry

6. Terrestrial Biomes Fig. 50.19

7. Terrestrial Biomes Warm, wet conditions correspond to high productivity, whereas cold or dry conditions result in low productivity

8. Terrestrial Biomes Tropical forest Fig. 50.19

9. Terrestrial Biomes Tropical forest Tropical forests account for ~7% of the Earth’s terrestrial surface area Even so, >90% of Earth’s species may inhabit tropical forests

10. Terrestrial Biomes Savanna Fig. 50.19

11. Terrestrial Biomes Savanna Both tropical...

12. Terrestrial Biomes Savanna … and temperate Rainfall is insufficient to support closed- canopy forest, and fire is often a characteristic agent of natural disturbance

13. Terrestrial Biomes Desert Fig. 50.19

14. Terrestrial Biomes Desert Arid conditions generally prevent high productivity

15. Terrestrial Biomes Chaparral Fig. 50.19

16. Terrestrial Biomes Chaparral Midlatitudinal coastal areas with mild, rainy winters and long, hot, dry summers Vegetation is dominated by shrubs and small trees

17. Terrestrial Biomes Temperate grassland Fig. 50.19

18. Terrestrial Biomes Temperate grassland The key to the persistence of grasslands is seasonal drought, occasional fires, and grazing by large ungulates

19. Terrestrial Biomes Temperate broadleaf (deciduous) forest Fig. 50.19

20. Terrestrial Biomes Temperate broadleaf (deciduous) forest Temperate broadleaf forests are found at midlatitudes where there is sufficient rainfall to support dense stands of trees Temperate broadleaf trees lose their leaves in winter Most temperate broadleaf forests in North America are secondary (regrowth) forests that returned after logging in the 19 th and 20 th centuries

21. Terrestrial Biomes Coniferous forest Fig. 50.19

22. Terrestrial Biomes Coniferous forest Large expanses of evergreen, coniferous forests are found at high latitudes where winters are cold and long

23. Terrestrial Biomes Tundra (both arctic & alpine) Fig. 50.19

24. Terrestrial Biomes Tundra (both arctic & alpine) Permafrost (permanently frozen subsoil), cold temperatures, and high winds exclude most tall plants