Lecture 23

Question 1

Symbiosis is

Answer 1

when two species interact closely together in a way which is beneficial to one or both.
Obligate: essential to existence of one or both
Faculatative: not essential to existence of one or both

Question 2

3 types symbiosis:

Answer 2

• Mutualism: both benefit eg. obligate (orals and algae) facultative (oxpeckers feed off ticks etc from buffalo)
• Commensalism: one species benefits, the other appears unharmed eg. barnacles and whales
• Parasitism: one benefits the other harmed (ectoparasites, endoparasites, blood parasites)

Question 3

Co-evolution

Answer 3

• orchids that mimic female wasps

- fig and fig wasp

Question 4

Niche separation

Answer 4

When two species use the environment differently in order to coexist

Question 5

Character displacement

Answer 5

species are different and change when they overlap and cooccur with other similar species but this goes when they overlap less