Lesson 10

Question 1

proportion of each species
relative to total number of
individuals of all species
living in community

Answer 1

relative abundance

Question 2

plots rank abundance (x-axis)
against corresponding relative
abundance (y-axis)

Answer 2

rank abundance diagram

Question 3

components of species diversity

Answer 3

richness and evenness

Question 4

number of species in the
community
- longer the curve, greater the
richness in community

Answer 4

species richness

Question 5

how equally individuals are
distributed among the
species
- more gradual the slope,
greater the evenness in
communit

Answer 5

species evenness

Question 6

refers to three closely related
indices that consider both species
number and relative abundance

Answer 6

simpsons diversity index

Question 7

three indices of simpsons

Answer 7

Simpson’s index D

• Simpson’s index of diversity 1 − D
• Simpson’s reciprocal index 1 / D

Question 8

probability that two randomly
selected individuals from
community will belong to
same species, reflects
DOMINANCE

Answer 8

simpsons index

Question 9

probability that two randomly
selected individuals from
community will belong to
different species

Answer 9

simpsons index of dveersity

Question 10

maximum value is the
number of species in the
community, species richness
(S)

Answer 10

simpsons reciprocal index

Question 11

widely used index of diversity

Answer 11

shannon index

Question 12

representation of feeding
relationships within a community
● a descriptive diagram representing
flow of energy from prey (consumed)
to predator (consumer)

Answer 12

food chain

Question 13

direction of arrow in the food chain

Answer 13

prey to
predator grass → grasshopper →
sparrow → hawk

Question 14

feeding groups are called

Answer 14

trophic levels

Question 15

usually autotrophs

Answer 15

basal species

Question 16

herbivores (H) or carnivores

Answer 16

intermediate species

Question 17

Top predators

Answer 17

not preyed upon themelves

Question 18

Food web could be divided into five

compartments based on

Answer 18

• differences in body size
• range of prey sizes selected
• use of shore versus off-shore habitats
• associated predators

Question 19

• abundance of populations is
  controlled by productivity and
  abundance of populations in trophic
  level below them

Answer 19

bottom up control

Question 20

predator populations control the

abundance of prey species

Answer 20

top down control

Question 21

removal of top predator results in increase

in intermediate species on which it preys

Answer 21

food web trophic cascade

Question 22

describes total competitive effects of

several interspecific competitors

Answer 22

diffuse competition

Question 23

Spatial change in community

structure

Answer 23

zonation

Question 24

Temporal change in

community structure at a given location

Answer 24

succession

Question 25

Occurs at
location not previously occupied by a
community; a newly exposed
surface

Answer 25

primary succession

Question 26

• Occurs at
  location previously occupied by a
  community which underwent a
  disturbance

Answer 26

secondary succession