Unit 2 Review (Biodiversity)

Question 1

Keystone Species

Answer 1

A species, often a predator, that exerts a profound influence on a community in excess of that expected by its relative abundance.

Question 2

what do species richness and evenness reveal about an ecosystem?

Answer 2

they indicate how stable an ecosystem is

Question 3

provisioning services

Answer 3

the goods produced or provided from an ecosystem,, ie) lumber and food

Question 4

regulating

Answer 4

the benefits obtained from regulating ecosystem processes ie) flood regulation, water purification, air detoxification

Question 5

cultural

Answer 5

non material benefits ie) camping or playing soccer in the park, or going on hikes for the fun of it

Question 6

supporting

Answer 6

services necessary for producing other ecosystem services ie) water cycling, soil formation and retention

Question 7

what is the difference between resistance and resilience?

Answer 7

resistance= the ability of an ecosystem to maintain its normal functions during a disturbance
resilliance= the ability for an ecosystem to recover from a disturbance

Question 8

what are some of the benefits of fire?

Answer 8

• gets rid of excess leaf litter and ground vegetation
• maintains native species that are able to withstand fire: those species adapt with thermal insulation in their leaves and bark so that they can withstand the fires
• thins the forest canopy which allows for more sunlight

Question 9

primary succession

Answer 9

begins with bare rock,, ex) newly formed islands

Question 10

secondary succession

Answer 10

happens after a disturbance,, ex) fire or flood