lecture 8 - cascades, disease and mutualism

Question 1

what is a trophic cascade

Answer 1

the addition or removal of top predators and involve reciprocal changes in the relative populations of predators and prey through a food chain

Question 2

micro parasites

Answer 2

reproduction leads to an increase in numbers within the host

Question 3

macro parasites

Answer 3

reproduction does not lead to an increase the number within that host (more than one host)

Question 4

what is a parasitoid

Answer 4

an insect whose larvae live in a host and eventually kill it

Question 5

major types of transmission pathways

Answer 5

vertical transmission

horizontal transmission

Question 6

vertical transmission

Answer 6

transmission between generations from parent to offspring

Question 7

horizontal transmission

Answer 7

transmission within one generation between unrelated individuals
direct contact transmission e.g. sexual, soil borne, waterborne, aerial (common cold)

Question 8

Micorrhizza

Answer 8

symbiotic association between plant roots and fungus

refers to the role of the fungi in the plants root system