Unit 2 Powerpoint

Download Report

Transcript Unit 2 Powerpoint

Unit 2 Species Interactions,
Succession and Biomes
Chp 4
A community has many interacting
species. These interactions are
called symbioses.
Predator-prey ( + , -)
Mimicry (copycat)
Plant-herbivore (form of predation)
Parasitism (Ecto and Endo parasites)
Mutualism ( + , +)
Commensalism ( +, 0 )
• Fires, Floods, Landslides, Hurricanes, and
Volcanic eruptions can cause ecological
• Over time the life changes in stages.
• Primary succession= area that has NOT
supported life(bare rock or sand dune).
• Secondary succession= replacement of
species over time following a disruption.
• Pioneer species are the first to develop.
Climax Community
• A stable end point of succession is called
a Climax Community.
• This remains constant for long periods of
Terrestrial Ecosystems
BIOMES= are very large terrestrial
ecosystems that contain a number of
smaller but related ecosystems within
There are seven major biomes
characterized by significant plant and
animal life, climate, rainfall,etc.
Cold and treeless
Largest and northernmost biome
Permafrost=permanently frozen layer of
Little rain, short growing season
Grasses,mosses,caribou,snowy owls,
arctic foxes, and snowshoe hares
Forest, cone-bearing trees, firs, hemlocks
Long and cold winters
Short summers
Low-nutrient soil
Moose, Bears, Wolves, most hibrenate 6-8
months of the year.
Temperate Deciduous Forest
Tress that lose their leaves in the fall
Even precipitation through the seasons
Birch, Elm, Oak, and Willow trees
Deer, Fox, Raccoon, Squirrell
Temperate Grassland
Little rainfall
Rich fertile soil
Large herds of grazing animals
Much of the area is used for growing crops
• Less than 9.9inches of rain per year
• Hot days and cold nights
• Animals and plants have adaptations to
conserve water
• Cacti, Lizards, Snakes
• Tropical or subtropical grasslands with
scattered trees and shrubs
• Support many herbivores=zebras, giraffes,
• Periods of drought alternate with periods
of rain
Tropical Rain Forest
• Very tall trees
• Abundant rainfall
• Canopy is high tree tops that shade the
forest floor
• Epiphytes live on these tall tress (but not
• Contain the most species, most diverse