6. Why have the heterogeneity characteristics of natural riverine landscapes been masked in many regions?
Fishing
Pollution
There
Higher concern for the biodiversity
7. Name the next scale of river in this sequence... region, catchment, stream...
Riffle
Pool
Grain
Stream reach
Patch
8. Which of these dimensions includes the catchment?
Vertical
Lateral
Longitudinal
9. The lateral dimension of rivers is from...
Channel-->river itself
Headwaters--> estuary
Riffle-->pool
Aquifer-->channel
10. Which of these is NOT an example of a longitudinal dimension of a river?
Headwaters-->estuary
Parapotamon-->channel
Freshwater-->marine
Channel-->tributary
Riffle-->pool
11. What is the 4th dimension of rivers?
Temporal
Lonteral
Taderal
Aberal
Loteral
12. Hydrological exchange pathways are most diverse in...
Beads
String
13. The river is confined (eg. by a canyon or because water is moving downstream) in...
String
Beads
14. What are terraces?
Former floodplain surfaces
The streambed at the estuary
Grazing areas for animals
The current streambed
15. Floodplain reaches (the "beads") are expansive, with multiple channels and deep alliuvial deposits
True
False
16. Numerous on-channel lakes, falls and rapids (as opposed to lateral migration and a graded channel) describes a river in its..
Advanced stage
Youthful stage
Middling stage
17. The Immediate Disturbance Hypothesis...
Says that river dyanmics, by constraining competitive exclusion, is responsible in part for high biodiversity of upper Amazon basin
is added to by the Dynamic Equilibrium Model which brings in a resource dimension (productivity)
All of the above
Predicts low community diversity in environments exposed to high disturbance levels
Says that species diversity is highest in situations experiencing immediate levels of disturbance (Constraining competitive exclusion, allowing coexistence of taxa)
18. Biota are adapted to exploit the spatio-temportal heterogeneity engendered by natural disturbance regimes-- expanding resource gradient and temporal heterogeneity-- increasing potential for niche overlap