cold at night nocturnal or diurnal
soil is very poor.
plants include cacti and wild-flowers.
most animals are nocturnal and include snakes,
lizards, small rodents, bats, and foxes.
Biomes – 10
found between forests and deserts
generally flat - plains
two types - temperate and savannah
temperate grassland biome:
Bread basket of the world:
The majority of the world’s food/grain is grown here!
western Ohio – 38 inches of rain each year
The temperate grassland biome:
20-35 inches of rainfall each year average. temperatures 86°F in the summer and
middle latitudes – 30° to 50°
32°F in the winter.
soil is rich and good for many plants animals
farmland - corn belt:
North America has the best soil for growing crops in the world! Why? Climate and seasons – cycles of life and death that build the soil, plus lots of water and sunlight
include prairie dogs, mice, and large grazing animals such as bison.
Biomes – 11
savanna grassland biome:
tropics to subtropics
0° to 30°
The savanna grassland biome:
60 inches of rainfall each year.
average temperatures are 93°F in the summer
and 61°F in the winter.
tropical grassland with scattered clumps of
small trees – shallow dirt
savannas of Africa are inhabited by some of the most diverse groups of large herbivores in the world such as zebras, giraffes, and elephants.
Lots of rain (leaching/erosion) washes away the nutrients in the dirt and causes it to be bad for growing.
Biomes – 12
The largest biome in the world is the marine biome. It based on salt water and contains all oceans and seas. Marine biomes can be divided into three zones depending on the biotic factors.
top - surface
planktic - floaters or drifters
nektic - swimmers
benthic - bottom dwellers
Water absorbs light, so sunlight can penetrate only about 200 m below the ocean’s surface. Because photosynthesis requires light, most marine producers are found near the surface.
Phytoplankton are the base of the marine food web. They are one of the most important life forms on planet earth!!!
Biomes – 13
Marine organisms that float or drift with the currents are called plankton. They are the most abundant form of life in the marine biome. Plankton range from microscopic algae to animals and organisms as large as jellyfish. Microscopic producers called phytoplankton produce the majority of oxygen in the atmosphere. Microscopic consumers are called zooplankton.
Most zooplankton are immature or larval forms of much larger animals.
Animals that actively swim, rather than drift with the currents are called nekton. Nekton include all swimming forms of fish, whales, and squid. All nektons are predators.
Biomes – 14
Plants and animals living in or on the sea floor are called benthic. These include kelp (tall algae plants) crabs, snails, sea urchins, star fish, and flounders. Benthic organisms may either be:
motile - move around on the bottom like snails, worms, and crabs
sessile - stationary their whole life like corals and clams
infauna - live in the sediments like clams and worms
epifauna - lives on the sediments at the bottom like crabs and corals
deposit feeders - moves to decaying organic stuff on the bottom
suspension feeders - food comes to it, eats food that falls to the bottom, often generates currents so the food moves to it