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39. STABILITY AND CHANGE - Coggle Diagram
39. STABILITY AND CHANGE
ECOSYSTEM STABILITY
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ECOSYSTEMS CAN BE SUSTAINABLE AS FOR EXAMPLE, THE DAINTREE FOREST HAS EXISTED FOR LONG PERIODS OF TIME
PLASTIC POLLUTION
MICROPLASTIC DEBRIS WILL LEACH CHEMICALS INTO THE WATER AND ABSORB TOXIC CONTAMINANTS CALLED PERSISTENT ORGANIC POLLUTANTS (POP)
BECAUSE MICROPLASTICS ARE SMALLER, THEY WILL ABSORB MORE POP, LEADING TO AN ACCUMULATION OF POP IN MARINE ANIMALS
BIOMAGNIFICATION
BIOMAGNIFICATION IS THE PROCESS IN WHICH CHEMICAL SUBSTANCES BECOME MORE CONCENTRATED AT EACH TROPHIC LEVEL
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DDT
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AT EACH TROPHIC LEVEL, THE CONCENTRATION OF DDT INCREASES DUE TO FOOD INTAKE
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KEYSTONE SPECIES
A KEYSTONE SPECIES IS A SPECIES THAT HAS A DISPROPORTIONATELY LARGE IMPACT ON THE ENVIRONMENT RELATIVE TO ITS ABUNDANCE
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FOR EXAMPLE, HONEY BEES THAT POLLINATE A WIDE VARIETY OF PLANT SPECIES
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EUTROPHICATION
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- LEACHING OF NITROGEN AND PHOSPHATE FERILISERS IN WATER
- RAPID GROWTH OF ALGAE AS MORE NUTRIENTS ARE AVAILABLE
- ALGAE DIE, INCREASING THE NUMBER OF SAPROTROPHIC MICROBES (DECOMPOSERS)
- HIGH RATES OF DECOMPOSITION WILL INCREASE BIOCHEMICAL OXYGEN DEMAND (BOD)
- THIS LEADS TO DEOXYGENATION OF WATER SUPPLY
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ECOLOGICAL SUCCESSION
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ABIOTIC CHANGES INCLUDE CLIMATIC FACTORS (WIND, FIRE, DISASTERS)
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PRIMARY SUCCESSION
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- SPECIES DIVERSITY INCREASES AS MORE SPECIES JOIN THE COMMUNITY
- PRIMARY PRODUCTION INCREASES AS LARGER PLANTS COLONIZE, INCREASING PHOTOSYNTHESIS
- FOOD WEBS BECOME MORE COMPLEX, INCREASING SPECIES DIVERSITY
- NUTRIENT CYCLES INCREASES AS PLANTS AND ANIMALS GENERATE MORE DEAD MATTER
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CYCLICAL SUCCESSION
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- VIA WIND, SEEDS OF CREOSOTE BUSH COLONIZE A SPACE
- THIS DRAWS BIRDS AND RODENTS, WHICH TRANSFER SEEDS OF THE CHRISTMAS CACTUS
- CACTUS GROWS UNDER THE BUSH AND COMPETES FOR AVAILABLE RESOURCES
- CACTUS IS MORE EFFECTIVE AT ABSORBING WATER, SO THE BUSH DIES
- WITHOUT A DEEPER ROOT SYSTEM, THE SOIL BEGINS TO ERODE AND CACTUS ROOT BECOME EXPOSED, CAUSING DEATH
- RE-ESTABLISHES AN OPEN SPACE FOR THE CYCLE TO REPEAT
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