Constant warmth and rainfall provides the home to most of the species on Earth. > 70% of all...
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Transcript of Constant warmth and rainfall provides the home to most of the species on Earth. > 70% of all...
Enormous Biodiversity
Constant warmth and rainfall provides the home to most of the species on Earth. > 70% of all terrestrial species
Question: How does the structure of a rainforest allow so
many species to coexist?
Rainforest
Top soil is thin and poor due to rapid nutrient recycling.
Adaptations to soil conditions Tree trunks widen their bases for support Shallow roots to absorb nutrients.
Rainforest
Vines and Epiphytes grow on the sides of tree trunks and limbs. Why would this be an advantage?
Temperate Deciduous Forest
Growing Season Spring through Summer Plants and trees produce and store large
amounts of food Autumn
Trees shed leaves to preserve water and energy over the winter
Photosynthesis stops Winter
Trees consume food storages.
Temperate Deciduous Forest
Decay of leaf litter is slowed by the winter months.
This provides a deep, rich layer of soil. More sunlight penetration results in a
thicker understory and more plant life on the forest floor.
Coniferous Forest
Leaves are needles Long, thin, and covered in a thick and waxy
resin. What advantage would this serve?
Coniferous Forest
Many conifers are shaped like a cone. What advantage would this provide?
Snow Insulates the roots of trees over the winter.
Tundra
Only thin layer of soil thaws in summer. How could plants adapt to a thin layer of
soil? Wide, shallow roots.
Mosses and Lichen can grow on bare rock.
Deserts
Absorbing water efficiently have very shallow roots that grow over a wide
area.
Preventing water loss. Succulent tissues Spines
Grasslands
Limited water Heavy cycles of rain followed by long
droughts.
Trees and shrubs grow near ponds, streams, and springs.
Grasslands
Fires Destroy most trees and shrubs
The majority of the biomass for grass is belowground in the form of roots. Why is this an advantage for grasses?
Convert organic matter into valuable nutrients, providing a deep, fertile soil for grasses.
Heat assists in germination of grass seeds.