Biodiversity, Succession and Biodiversity, Succession and Resources Resources Evolutionary processes have resulted in a DIVERSITY of organisms and a diversity of roles in ecosystems. http://www.bing.com/videos/search? q=BIODIVERSITY+VIDEO&FORM=VIRE2&adlt=s trict#view=detail&mid=85A62B4A0ADCF606 78A185A62B4A0ADCF60678A1
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Biodiversity, Succession and Resources Evolutionary processes have resulted in a DIVERSITY of organisms and a diversity of roles in ecosystems. .
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Biodiversity, Succession and Biodiversity, Succession and ResourcesResources
Evolutionary processes have resulted in a DIVERSITY of
• Benefits Humans!:Benefits Humans!:• Ensures a variety of Ensures a variety of genetic materialgenetic material• VastVast rainforests rainforests may hold may hold curescures, ,
medicinesmedicines and other useful resources!and other useful resources!
Video on Threats to Biodiversity – 26 Video on Threats to Biodiversity – 26 minmin
HOW DO HUMANS REDUCE BIODIVERSITY?HOW DO HUMANS REDUCE BIODIVERSITY?1.1. DEFORESTATION:DEFORESTATION:
• Destruction of forests• IMPACT: Forces many orgs to find
new homes• If cannot adapt, will become
EXTINCTEXTINCT
2.2. OVER HUNTING:OVER HUNTING:• When bounties offered for a certain
species, it can become over hunted EX: LION
• IMPACT: With such a drastic drop, will affect populations of other animals
• EX: DEER POP’N ROSE B/C NO LIONS; DEER OVERGRAZED AND STARVED THEMSELVES
HOW DO HUMANS REDUCE BIODIVERSITY?HOW DO HUMANS REDUCE BIODIVERSITY?
3. CLEARING LAND FOR FARMING AND SPACE:
• Replacing a diverse ecosystem with one or two crops
• IMPACT: Taking away resources for ourselves and other species
4. DIRECT HARVESTING:• Taking species out of natural habitat for our
benefit (wanting unusual pets or plants)• IMPACT: We are reducing the # of those
species in their natural habitat
HOW DO HUMANS REDUCE BIODIVERSITY?HOW DO HUMANS REDUCE BIODIVERSITY?
5. IMPORTED SPECIES :• When a species is imported and released
into a new environment• IMPACT: New species may adapt well and
drive out existing species • EX: Rabbits in Australia
• IMPACT: New species often become pests because they have NO NATURAL PREDATORS• EX: Zebra mussels in NY waterways
Zebra musselZebra mussel
ecological & economic damage
~2 months
reduces diversity loss of food & nesting sites
for animals economic damage
reduces diversity loss of food & nesting sites
for animals economic damage
What is Ecological Succession?What is Ecological Succession?• A series of changes by which one A series of changes by which one habitat habitat
naturally naturally changes into anotherchanges into another
• PROCESS:PROCESS:• Starts with simple habitat w/ little diversityStarts with simple habitat w/ little diversity• CLIMAX COMMUNITYCLIMAX COMMUNITY::
• A stable diverse habitat (ex. Forest)A stable diverse habitat (ex. Forest)• Will be reached if Will be reached if climate remains climate remains stable over a stable over a
number of yearsnumber of years
When does Succession occur?When does Succession occur?1. When environment becomes suitable for another
community:• Grasses grow in shallow soil, but add nutrients as they live
and die• Soil then becomes suitable for shrubs• Shrubs shade out the grasses and take over• Over time, shrubs will be shaded out by trees
2. When natural disasters occur that alter stable ecosystems
• Fires, overgrazing, etc…….• Altered ecosystems will need many successions to
recover
Stage 1: Bare BedrockStage 1: Bare Bedrock
BareBedrock
Stage 2: Lichens growStage 2: Lichens grow
BareBedrock
Bedrock With
Lichens
Stage 3: Mosses growStage 3: Mosses grow
BareBedrock
Bedrock With
Lichens
BedrockWith
Mosses
Stage 4: Grasses growStage 4: Grasses grow
BareBedrock
Bedrock With
Lichens
BedrockWith
Mosses
Grasses
Stage 5: Shrubs and small treesStage 5: Shrubs and small trees
BareBedrock
Bedrock With
Lichens
BedrockWith
Mosses
Grasses
Trees And
Shrubs
Stage 6: Climax Forest (100 – 200 Stage 6: Climax Forest (100 – 200 years without disturbance)years without disturbance)
BareBedrock
Bedrock With
Lichens
BedrockWith
Mosses
Grasses
Trees And
Shrubs
ClimaxForest
Succession can also happen in a Succession can also happen in a lake!lake!
LakeHabitat
Erosion causes
buildup ofOrganic debris in
lake
Lake fills in becoming shallower
and eventually becomes a
swamp
Filling in continues
and eventually a climax forest
results
Friday, June 6, 11:34:32 AMFriday, June 6, 11:34:32 AM
View the process of ecological succession as it occurs in coastal lowlands by clicking on the image
below
What resources can we use over What resources can we use over and over again?and over again?
1. RENEWABLE 1. RENEWABLE RESOURCESRESOURCES•Can be replaced Can be replaced naturallynaturally•Still need to be used carefullyStill need to be used carefully
• EXEX: : Fish are renewable but over harvesting Fish are renewable but over harvesting and damaging environment can inhibit and damaging environment can inhibit renewalrenewal
•Can you name some renewable resources?Can you name some renewable resources?• WaterWater, , foodfood, solar energy, fruits/vegs, , solar energy, fruits/vegs,
Wood, BambooWood, Bamboo
What resources do we use that cannot be What resources do we use that cannot be replaced?replaced?2. NONRENEWABLE RESOURCES2. NONRENEWABLE RESOURCES•Decisions we make today affect what our future Decisions we make today affect what our future will havewill have•Most things we use are being depleted due to Most things we use are being depleted due to industrializationindustrialization and and technologytechnology•Can you list some nonrenewable resources?Can you list some nonrenewable resources?