Lecture 33

Question 1

Aposematic Colouration

Answer 1

warning colouration that they are poisonous

Question 2

Mimicry

Answer 2

Batesian: trying to look like something else that may appear harmful
Mullerian: both species that mimic each other are poisonous

Question 3

Keystone Species

Answer 3

species that holds the structure and the integrity of the community

Question 4

Keystone Predators: Wolves

Answer 4

lowered the number of deer which increased vegetation which led to an increase in a lot more species

Question 5

Individualistic Hypothesis

Answer 5

the community is a chance assemblage of species with similar habitat requirements

Question 6

Interactive Hypothesis

Answer 6

the community is an assemblage of stable and integrated species, locked into association by mandatory interactions

Question 7

Ecological Succession

Answer 7

non-seasonal and directional pattern of colonisation and extinction on a site by different species

Question 8

Primary Succession

Answer 8

begins with a virtually “lifeless” environment

Question 9

Pioneer Stage

Answer 9

not competitive, generally change conditions facilitating subsequent stages

Question 10

Facilitation

Answer 10

when one species alters the environment in a way that benefits other species allowing them to enter the community

Question 11

Inhibition

Answer 11

one species is prohibited from becoming established by the presence of another species

Question 12

Tolerance

Answer 12

existing species do not affect the probability that subsequent species will become established

Question 13

Climax Stage

Answer 13

stable end community of succession (self-perpetuating under prevailing conditions)

Question 14

Secondary Succession

Answer 14

gradual invasion of species from surrounding communities following a disturbance (including human habitat disturbances)

Question 15

Island Biogeography

Answer 15

suggested a balance of immigration and extinction leading to equilibrium levels of species richness on islands