Lecture 28 Biomes Biogeography KRG upload [Read-Only]

Lecture 28 Biomes Biogeography KRG upload [Read-Only] -...

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QUIZ: Monday Only on populations and biogeography: lectures 25-28, chapters 54, 55 EXAM: Wednesday Everything since Spring Break up to and including Mondays lecture The Distribution of Life on Earth • Earth is an isolated sphere • White/ blue = water • Green – plants = life • Earth surface is dynamic – clouds, seasons • Life exists in a narrow layer - the biosphere - 9000m highest mountains, 10 km deepest oceanic point What do we observe?
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Is there any pattern to life on earth? Tundra : Arctic and at high elevations. Vegetation is low-growing perennials. Arctic tundra is underlain by permafrost . Soils can be wet because of poor drainage. Animals migrate or go dormant for much of the year.
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54A Tundra (Part 1) Boreal forest ( taiga ): Long, cold winters; short summers. Dominated by evergreens in the Northern Hemisphere can start photosynthesis quickly in the short growing season. Only a few tree species. Dominant mammals, (e.g., moose and hares) eat leaves.
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Temperate evergreen forests : Along coasts of continents at mid to high latitudes. Winters are mild but wet; summers are cool and dry. 54B Boreal and Temperate Evergreen Forest (Part 1)
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Temperate deciduous forest : Precipitation is distributed evenly, but temperatures fluctuate dramatically. Dominated by deciduous trees that lose leaves during the cold season. Some animals migrate to avoid cold season (e.g., songbirds), others hibernate or diapause. 54C Temperate Deciduous Forest (Part 1)
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Temperate grasslands : Dry much of the year; hot summers and cold winters. Rich in species; grasses, sedges, and forbs . Plants are adapted to grazing and fire. Much of this biome has been converted to agriculture. The topsoil is deep and rich. 54D Temperate Grasslands (Part 1)
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: In two belts at 30 ° N and 30 ° S. More species and more structurally diverse vegetation than cold deserts. Plants have many adaptations to dry conditions. Succulents are common. Many annuals grow only after a rainfall. Small animals stay in burrows during the day; many get water only from their food. 54E
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Lecture 28 Biomes Biogeography KRG upload [Read-Only] -...

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