BIOL 2Q04 Lecture Notes - Lecture 16: London Academy Of Music And Dramatic Art, Overexploitation, Species Richness
14 Dec 2016
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BIOL 2Q04 | November 14, 2016
Biodiversit Cot’d
How Do We Measure Diversity?
− “tartig ith a eaple that ou’re failiar ith... I took a snippet of lab 7 data
− Which community do you think is the most diverse?
February → 16, 059
May → 2, 058
dz/dt = 14001
d/dy= -(betaxy)/N
= -[(0.4)(199983941)(16059)]/200000000
= 6423
dy/dt = [(betaxy)/N] – yY
= 6423 – 13971
= -7548
dz/dt = 14001/13971
Ro = beta/y
Ro = 0.4/0.87
Ro = 0.4
find more resources at oneclass.com
find more resources at oneclass.com
Sipso’s Ide
− Simpsons (1949): What is the probability of 2 individuals picked at random in a community of infinite
size will be of the same species?
− D = ∑(n/N)2
o Where n = species 1 and N = total species
o Values range between 0 -1 with numbers
o closer to 0 = more diverse – NOT INTUITIVE
− 2 ways of getting over this non-intuitive problem:
o 1-D (values range 0 to 1, closer 1 more diverse)
o 1/D (values are greater than 1 are more diverse) – used in lab 7
− Reciprocal 1/D:
− Regular 1-D:
Where n = number of species 1
N = Total number of species in ecosystem
− Example from lab – reciprocal 1/D
− Does’t atter hih oe ou use, just e osistet! Geerall, the reiprocal makes more sense as
you will almost always have at least 1 species
− Summary:
o Lake Moodie: 1/D = 3.24; 1-D = 0.31
o Glenridge: 1/D = 4.10; 1-D = 0.24
o Values will vary between 0 and 1 and values will increase with diversity for 1-D, so accordingly,
Lake Moodie is more diverse
o If we look at reciprocal, increasing numbers over 1 = more diverse. So accordingly, Glenridge is
more diversity
o Be consistent, always use one not both equations
o Reciprocal tends to make more sense
Shannon-Wieer Ide H’
− It was conceived through information theory
o How difficult would it be to predict correctly the species of the next individual collected?
− Where pi = proportion of the one particular species (n1/N)
− In pi = puts emphasis on rare species
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Tarti(cid:374)g (cid:449)ith a(cid:374) e(cid:454)a(cid:373)ple that (cid:455)ou"re fa(cid:373)iliar (cid:449)ith I took a snippet of lab 7 data. May 2, 058 dz/dt = 14001 d/dy= -(betaxy)/n. D = (n/n)2: where n = species 1 and n = total species, values range between 0 -1 with numbers, closer to 0 = more diverse not intuitive. 2 ways of getting over this non-intuitive problem: 1-d (values range 0 to 1, closer 1 more diverse, 1/d (values are greater than 1 are more diverse) used in lab 7. N = total number of species in ecosystem. Does(cid:374)"t (cid:373)atter (cid:449)hi(cid:272)h o(cid:374)e (cid:455)ou use, just (cid:271)e (cid:272)o(cid:374)siste(cid:374)t! Ge(cid:374)erall(cid:455), the re(cid:272)iprocal makes more sense as you will almost always have at least 1 species. Summary: lake moodie: 1/d = 3. 24; 1-d = 0. 31, glenridge: 1/d = 4. 10; 1-d = 0. 24, values will vary between 0 and 1 and values will increase with diversity for 1-d, so accordingly,
