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Lecture 27

BIOL 1001 Lecture Notes - Lecture 27: Outcrossing, Ecological Relationship, Carbon Cycle


Department
Biology
Course Code
BIOL 1001
Professor
Alexander Mills
Lecture
27

Page:
of 3
Adaptive Radiations & Mass Extinctions
Adaptive Radiation
o
oRapid Diversication
New Ecological Opportunities
New Morphological Innovations 

Mass Extinctions
o 
o!
o!"##!!#
o!"$
!% 
60%1
million years
othe Big Five Mass Extinctions
o&&
Background Extinctions
"
'()
(!"$
*#
oNormal Environmental Change
oEmerging disease
ocompetition
o+#Natural Selection
Mass Extinctions
"$
,"
-#.#
+NOT directly related to Fitness or to
Adaptation
the End-Cretaceous
o65#
o1.4%/"
"##0
"$##-1(#
o2"3."$4
the Impact Hypothesis
(/"56#
."$#60-80%

"
oIridium##(*7-#"
8#
the End-Permian
o"#
o251#
o5.5%
o"#
95:(#
;<=&&>?:7
-@
A
oB&%Massive Volcanism
o<&.#.
o>&..
oC&7$%17( 
o6&%..
'"$
o/
&&(!
o/,D
&&,!Permian"$E
#
Adaptive Radiation
o(!Star Phylogenies
oStar Phylogeny
a Large Polytomy
Rapid Speciation
o1. Ecological Opportunity
(*Resources
&&'an Unexploited Habitat
&&
o
(
F(!.
oB6?
o#
o<,#C"-
oGH-@
#
,#(!/
<
o2. Morphological Innovation
"#I-

o
o$
o#
##% J
&&
'
o$##
o+#<6?E???)
'12
oB5?#
o+#B?E???