Threats to Rivers

Question 1

Habitat alteration by dams

Answer 1

1. flow regime
2. sediment
3. thermal
4. chemical
5. residence time
6. biotic fragmentation
7. impoundments

Question 2

hydropower

Answer 2

energy from water travelling through a dam

Question 3

otilith

Answer 3

inner ear bone, ages a fish daily. closer rings in winter, further rings in summer

Question 4

mercury pollution

Answer 4

only need a small amount to contaminate environment

Question 5

channelization

Answer 5

cities get so big they essentially cover the channel, so have to change the channel. drain wetlands to change channel to make room for houses/buildings. Kissimmee river, FL