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Download NATURAL CHANGES IN ECOSYSTEMS
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2.! Secondary'Succession''
•! When!a!mature!
forest!is!
_______________!
_______________!
(ex:!forest!fire),!
grasses,!flowers!
and!other!plants!start!growing!again!very!quickly!!!called!secondary!succession!
•! Occurs!much!more!_______________!than!Primary!Succession!
!
!
!
!
Organisms'Adaptation''
•! With!changes!in!the!plant!life,!
there!are!also!corresponding!
changes!in!the!animal!diversity!
•! Animals!with!characteristics!
that!make!them!more!
successful!often!
_______________!more!
successfully!than!other!
individuals!of!the!same!species!
that!lack!that!characteristic!!!
over!time!that!characteristic!
becomes!the!_______________!one!
•! If!the!changes!are!different!for!different!areas,!then!it!could!be!that!different!species!
_______________!in!those!areas!
•! Adaptive!Radiation!–!
describes!the!change!from!a!
common!_______________!
into!a!number!of!
_______________!species!
•! Galapagos!finches!–!
thought!to!all!evolve!from!
one!type!of!finch!!!
different!individuals!
evolved!differently!
depending!on!the!type!of!
food!they!ate!(large!or!
small!seeds,!fruit,!cactus)!!
!
Natural'Changes'to'Ecosystems'
Flooding'
•! Can!be!normal!or!due!to!heavy!_______________,!increased!_______________,!etc!
•! Results!in!soil!_______________!and!soil!_______________!from!water!contaminants!
•! Can!cause!spread!of!_______________!
if!untreated!sewage!enters!drinking!
water!sources!
•! _______________!change!may!be!
causing!increased!flooding!in!some!
parts!of!the!world!
!
Tsunamis'
•! A!huge,!rapidly!moving!wave!caused!by!_______________!or!underwater!
_______________!eruptions!
•! Can!wash!away!plants!and!animals!when!it!rolls!over!land!
•! Deposited!_______________!changes!the!soil!composition!!!most!plants!affected!and!
some!die!off!
!
Drought'
•! Usually!occurs!when!there!is!a!_______________!average!amount!of!precipitation!
•! Ecosystems!can!usually!recover!unless!the!drought!is!_______________!
•! Parts!of!Australia,!Western!Europe!and!Africa!have!experienced!drought!conditions!
recently!!!may!be!worse!due!to!climate!changes!!
•! !
Insect'Infestation'
•! Insects!play!a!big!role!in!
natural!succession!of!
forests!!!some!kill!off!
_______________!
_______________!trees!to!
make!room!for!new!ones!
•! Dead!trees!provide!_______________!and!_______________!until!they!are!
decomposed!back!into!soil!!
•! Insects!are!also!a!_______________!source!for!other!insects!and!birds!
•! Climate!changes!have!resulted!in!some!insect!species!growth!not!being!limited!
!
Example:!Mountain!Pine!Beetle!O!https://www.youtube.com/watch?v=9kkWxUgMHfA!!
•! Sustained!winter!temperatures!of!colder!than!O30°C!required!to!kill!beetle!larvae!
•! Suppression!of!forest!fires!results!in!infested!trees!not!being!destroyed!
•! Population!so!big!that!they!now!attack!younger!trees!
•! Loss!of!pine!forests!results!in!a!decrease!of!animal!and!bird!populations!!
!
!
Homework'
'
'
Change'in'Ecosystem'Worksheet'(BC'Science'10'SWB'pg.'40)'
Primary'and'Secondary'Succession'(BC'Science'10'SWB'pg.'41)'
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'
Check'Your'Understanding'(pg.'121)'#2,'4,'7T9'
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