Transcript Ecosystem Recycling - Mrs. Reid's Webpage

POP QUIZ From Last class:
Answer questions on a separate sheet of paper! Hand IN
1.
Your house is an example of a(n) ___.
a. biotic factor
b. habitat
c. niche
2. Trees, mosses and shrubs are all examples of what type of factor?
a. abiotic
b. biotic
c. commensalism
3. The study of interactions between organisms and their
environments is called ?
a. botany
b. cytology
c. ecology
4. If you work at McDonald’s, that is an example of your?
a. habitat
b. niche
c. community
5. A group of deer that live in a forest is an example of a?
a. biosphere
b. community
c. population
Ecosystem Recycling
HEADINGS
VOCABULARY
IMPORTANT INFO
 ENERGY FLOWS THROUGH ECOSYSTEM
 WATER—NITROGEN—CARBON—PHOSPHORUS ARE
RECYCLED!!!
 THEY MOVE THRU A BIOGEOCHEMICAL CYCLE:
 ABIOTIC (non-living) PORTION OF ENVIRONMENT
(ATMOSPHERE)  LIVING THINGSTHEN BACK AGAIN
Water Cycle
 CELLS CONTAIN 70-90% H20
 VERY LITTLE OF EARTHS




AVAILABLE H20 IS IN LIVING
THINGS
RIVERS / LAKES /
STREAMS / OCEANS CONTAIN
A BIG %
ATMOSPHERE CONTAIN
WATER = WATER VAPOR
GROUND WATER = IN SOIL
OR UNDERGROUND IN
POROUS ROCK
WATER CYCLE = MOVEMENT
OF H20 B/T RESERVOIRS
 EVAPORATION
 TRANSPIRATION
 PRECIPITATION
Evaporation
 ADDS H20 VAPOR TO
ATMOSPHERE
 HEAT CAUSES
WATER TO
EVAPORATE
 90% OF EVAPORATED
WATER FROM
TERRESTRIAL
ECOSYSTEM PASSES
THROUGH PLANTS IN
A PROCESS CALLED…
Transpiration
 PLANTS TAKE IN H20 THRU
ROOTS
 RELEASE WATER & TAKE IN
CO2 (CARBON DIOXIDE)
 ANIMALS DRINK/
EAT TO TAKE
IN H20
 ANIMALS
RELEASE IT WHEN:



BREATHING
SWEATING
EXCRETION
Precipitation
 WATER LEAVES
ATMOSPHERE
 TEMP & AIR PRESSURE
(ABIOTIC FACTORS)
DETERMINE HOW
MUCH WATER CAN BE
HELD
 ONCE ATM. IS
SATURATED W/VAPOR
=

SNOW, RAIN, SLEET,
HAIL OR FOG
Carbon Cycle
 PHOTOSYNTHESIS + CELLULAR RESPIRATION
 PHOTOSYNTHESIS = PLANTS & OTHER
AUTOTROPHS USE:
 CO2 + H20 & SUNLIGHT = CARBOHYDRATES
CELLULAR RESPIRATION
 PROCESS IN WHICH
AUTOTROPHS &
HETEROTROPHS USE
OXYGEN (O2) TO
BREAKDOWN CARBS.
 CELLS MAKE ATP
(ENERGY) BY BREAKING
DOWN
ORGANIC
COMPOUNDS

A COMPOUND THAT
RESULTS FROM LIVING
THINGS & CONTAINS
CARBON
HUMAN INFLUENCE ON THE CARBON CYCLE
 IN THE PAST 150 YEARS CO2 IN
THE ATMOSPHERE HAS RISEN
30% ALMOST ½ IN THE LAST
40 YEARS
 DUE TO HUMANS ACTIVITY
 BURNING FOSSIL FUEL:

REMAINS OF
ORGANISMS THAT
HAVE BEEN
TRANSFORMED BY
DECAY, HEAT, &
PRESSURE 
 ENERGY
RICH
ORGANIC MOLECULES
 BURNING
RELEASES ENERGY
& CO2
 BURNING
VEGETATION
RELEASES CO2
 TROPICAL
RAINFOREST
DESTRUCTION
 WITH NO PLANTS
CO2 IS NOT
ABSORBED
Nitrogen Cycle
 NITROGEN IS NEEDED TO MAKE
PROTEINS & NUCLEIC ACIDS:
 ORGANIC MOLECULE, DNA OR
RNA, THAT STORES & CARRIES
IMPORTANT INFO FOR CELL
FUNCTION
 N2 (NITROGEN GAS) MAKES UP
78% OF THE ATMOSPHERE
 N2 IS HOWEVER
LIMITED TO
AMMONIA FOR
MOST LIVING
THINGS
NITROGEN FIXATION
 CONVERSION OF N2 TO AMMONIA
 CERTAIN BACTERIA CAN CONVERT  NH3 =
NITROGENFIXING
BACTERIA
 LIVE IN SOIL &
IN SOME ROOTS
Recycling Nitrogen
 BODIES OF DEAD ORGANISMS CONTAIN “N”

URINE & DUNG ALSO
 DECOMPOSERS BREAK DOWN CORPSES &
WASTE OF ORGANISMS GIVE OFF NITROGEN AS
AMMONIA =
AMMONIFICATION
 NITRIFICATION =
BACTERIA IN SOIL
TAKE IN AMMONIA
& OXIDIZE IT INTO
NITRITES, NO2 &
NITRATES, NO3
Back into the environment
DENITRIFICATION
 RETURNING NITROGEN TO ATMOSPHERE
 PLANTS CAN ABSORB NITRATES & AMMONIA
FROM SOIL

ANIMALS CANNOT!
 ANIMALS OBTAIN IT
BY EATING OTHER
ORGANISMS
 THEY DIGEST THE
PROTEINS &
NUCLEIC ACIDS
SUMMARY
1. WHAT IS THE BIOGEOCHEMICAL CYCLE
2. WHERE DO NITROGEN-FIXING
BACTERIA LIVE? WHAT CRUCIAL
FUNCTION DO THEY PERFORM?
3. DESCRIBE THE ROLE OF DECOMPOSERS
IN NITROGEN CYCLE?
4. HOW HAS BURNING FOSSIL FUELS
AFFECTED CARBON CYCLE?
5. THROUGH WHAT PROCESS DOES MOST
H20 VAPOR ENTER ATM.