cycles & patterns in the biosphere
TRANSCRIPT
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You will die but the carbon will not; its career does You will die but the carbon will not; its career does
not end with you. It will return to the soil and there not end with you. It will return to the soil and there
a plant may take it up again in time, sending it a plant may take it up again in time, sending it
once more on a cycle of plant and animal life.once more on a cycle of plant and animal life.
——Jacob BronowskiJacob Bronowski
Cycles & PatternsCycles & Patterns
in the Biospherein the Biosphere
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v The Impact of Plants and Animals on the
Landscape
v The Geographical Approach to the Study
of Organisms
v Biochemical Cycles
v Food Chains
v Natural Distributions
v Environmental Relationships
Cycles and Patterns in the Biosphere
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The Impact of Plants and Animals on the
Landscape
• Biosphere
• Human Impacts Can Overwhelm the Biosphere
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• Biosphere is still an integral part of the
landscape
Atmosphere
(climate’s domain)
Lithosphere: Land surface
Hydrosphere: Ocean,
freshwater & ice
Biosphere: Plants & Animals
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– Organisms survive in the biosphere through
systemic flows of energy, water, and nutrients.
– These flows involve biochemical cycles
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The Geographical Approach to the Study
of Organisms
• Geographical Viewpoint
– Seeks to explain distributions of phenomena
and how their spatial patterns change over time
• Biogeography
– Study of plant and animal distributions and how
their spatial patterns change over time
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Biochemical Cycles
• The Flow of Energy
Animation
1. Net Primary Productivity
2. Biological Productivity in Midlatitude Oceans
• Photosynthesis and Respiration
Carbohydrates + O2 CO2 + H2O + energy (heat)
CO2 + H2O carbohydrates + O2
light
– Photosynthesis
– Respiration
– Net Photosynthesis (e.g., gain/loss kg carbon-yr
)
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– Net Primary Productivity
• Net photosynthesis yr-1
unit area-1
(e.g., kg m-2
yr-1
)
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Global Net Primary Productivity
Based on rate of plant absorption of carbon dioxide
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North Atlantic Ocean Net Primary Productivity
Based on density of chlorophyll
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Hydrologic Cycle
– H2O – most abundant substance of the biosphere
– Two locations
• In residence in plant and animal tissues
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– Two locations (continued)
• In transit from one sphere to another
Atmosphere
Lithosphere
Hydrosphere
Biosphere
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Carbon Cycle
– Photosynthesis “pulls” atmospheric carbon into
the biosphere.
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– Carbon moves constantly from the living system to
organic reservoirs and back.
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Oxygen Cycle
– O2 is mainly a byproduct of photosynthesis
– Other sources...
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• Nitrogen Cycle – N2 – Atmospheric nitrogen (78% of air)
– Nitrogen fixation
• Other Mineral Cycles – Trace minerals (e.g., phosphorous, sulfur and calcium)
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Food Chains • Pathways of energy, water and nutrients on which
organisms depend for their survival.
A simple food chain
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Fundamental Units of a Food Chain
Plants are Autotrophs
(Self-feeders that fix carbon – storing solar energy)
Primary Consumers
Herbivores
(plant-eaters)
Secondary Consumers
Carnivores
(meat-eaters)
Animals are Heterotrophs
(Consumers)
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Food Pyramid
Many primary
consumers
Few Secondary
Consumers
— D
ecre
ase in n
um
ber
of
consum
ers
—
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Large predators are at top of the pyramid
A lynx pouncing on a snowshoe hare
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Pollutants in the Food Chain
– Biological amplification
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Natural Distributions • Evolutionary Development
– Darwinian theory of natural selection
– Influence of Plate Tectonics
• Acacia species – widespread distribution before the Pangaea
break-up
Acacias are widespread in tropics today
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Eucalyptus – Did not exist on Pangaea.
Eucalyptus species developed in geographical isolation in Australia, after the Pangaea break-up.
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Migration/Dispersal – Plants disperse seeds via wind, water, and
animals. Example: Coconuts
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– Animals migrate via legs, wings, fins, etc.
Example: Cattle egrets
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Reproductive Success
– Reproductive success allows one competing
population to flourish while another languishes.
Example: American bison
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Extinction
– Plant succession. One type of
vegetation is replaced by
another naturally
Example: Infilling of a small lake
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Environmental Relationships • Plants and animals compete with one another for
natural resources in a dynamic environment.
Limiting factors of the environment
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The Influence of Climate
– Light
• Plant shape
• Photoperiodism
Effect of light on tree shape
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Moisture
• Effect of moisture supply on plant adaptations.
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Temperature – Plant tolerances to cold
– Animal tolerances to cold
Wind – Animal body heat loss
– Plant desiccation or wind shear
Desiccation and wind-shear effect on trees in a timberline zone
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Topographic Influences – Steepness of slopes
– Orientation of slopes in regards to sunlight
– Porosity of soil on slopes
Wildfire impacts
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Environmental Correlations: Example of Selva
– Climate – Af
– Flora – Tropical rainforest
– Fauna – Flyers, crawlers, creepers, and climbers
– Soil – Laterization
– Hydrography: Abundance of runoff, heavy sediment loads in rivers
Tropical rainforest scene in Ecuador
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• The biosphere consists of all plant and
animal life forms on Earth. It overlaps with
the other three environmental spheres.
• All life forms depend on three ingredients:
solar energy, water and nutrients. These
ingredients are unevenly distributed on
Earth’s surface.
• The three ingredients continuously cycle
through the biosphere, as organisms absorb
and return them to the other three spheres.
Summary
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• The most prominent geochemical cycles
involve water, carbon, oxygen and nitrogen.
• Floral-faunal relationships can be described
as a food chain or food pyramid.
• Plants are the “self-feeders”; they are the
first link in the food chain and at the bottom
of the food pyramid.
• Animals are either primary or secondary
consumers of energy stored by plants.
Summary
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• Factors in the environment that determine
the survival of plants and animals are
limiting factors. The main limiting factors are
light, water, shelter and nutrients.
• Climate is the main influence on how the
limiting factors vary from place to place on
Earth, but soils, topography and wildfires
also influence local plant and animal
distributions.
Summary