SHW - Pg. 2

7. ID factors that are significant to organism distribution and abundance in a lake.
- Depth of water, distance from shore, and open water versus bottom desiccation, climate, freshwater /marine environments; substrate composition can affect water chemistry; physical structure, pH, and mineral composition of soils and rocks

8. What is the difference b/t a lake that is oligotrophic and one that is eutrophic?
- Oligotrophic lakes are deep, nutrient poor, oxygen rich, and contain little life.
- Eutrophic lakes are shallow, nutrient rich, and oxygen poor.

9. Fill in the following chart.

Biome
Abiotic Characteristics
Biotic Characteristics

Tropical Rain Forest
- constant high amounts of rainfall (200 to 400 cm annually).
- precipitation is highly seasonal.
- air temperatures range between 25°C and 29°C year round.

- Animal diversity is higher in tropical forests than in any other terrestrial biome.
- Many trees with epiphytes

Savanna Desert
- low and highly variable rainfall, generally less than 30 cm per year.
- Temperature varies greatly seasonally and daily

- Desert vegetation is usually sparse and includes succulents
( cacti & deeply rooted shrubs.)
-Many desert animals are nocturnal

Temperate Grassland
- Rainfall is seasonal, averaging 30–50 cm per year
- Temperature averaging 24–29°C with some seasonal variation

- vegetation is grassland with scattered trees
- Large herbivorous mammals are common inhabitants.

Temperate Deciduous Forest
- Sufficient moisture for trees to grow.

- Dense stand of trees.
- closed canopy, one or two strata of under-story trees, a shrub layer, and an herbaceous layer

Coniferous Forest (Taiga)
- long, cold winters and short, wet summers
- periodic drought

- home to many birds & mammals
- logged at a very high rate (endangered)

Artic Tundra
- winter is long and cold, while the summer is short and mild

-musk oxen and some migratory birds