Aquatic ecosystems - Streams and rivers
10 important questions on Aquatic ecosystems - Streams and rivers
What is the River Continuum Concept?
What are the characteristics of the upper reach of streams and rivers?
- shade by trees
- high flow velocity
- low primary productivity
What are the characteristics of the middle reach of streams and river, compared to the upper reach?
- more open: aquatic plants
- lower flow velocity
- high primary productivity
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What are the functional groups of macro-invertebrates?
-collectors: filter/collect FPROM 0,5 mum-1 mm
-predators
-scrapers/grazers: eat periphyton
What is the function of a ditch?
Where do functional groups of macro-invertebrates live in the RCC?
shredders: predominantly upper reach and a little in middle reach
grazers: middle reach and a little in upper reach
collectors: predominantly lower reach
How are the conditions in a average ditch?
What are threats to streams and rivers?
-regulation of morphology (meanders weghalen etc)
- obstacles (weirs/stuwen)
-dams and reservoirs
Why are oceans more clear than inland waters?
How can streams and rivers be restored?
2. Water management: reduce peak discharges to prevent weirs
3. Natural morphology
4. Measures
- re-meandering (restore natural profile)
- remove obstacles -> install fish ladders
- retention areas, inundation zones
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