Water- Chapter 6

Question 1

what is the driving force behind mixing of water?

Answer 1

• the change in water temperature and in turn density

- winds and tides

Question 2

is the mixing of two layers important

Answer 2

• it mixes the available nutrients

Question 3

what is stratification based on ( of primary producers in a water column?

Answer 3

• wave length of light as it penetrate water

- allows for less competition (photosynthesis) based on wave length use

Question 4

where would you expect heterotrophic bacteria to accumulate in aquatic environments?

Answer 4

• at the surface, thermocline, benthic zone ect, (where ever there is available NUTRIENTS)

Question 5

rate of primary production is higher in an oligotrophic lake, wherease the rate of secondary production is muhc higher in a eutrophic lake, why?

Answer 5

• heteroptrophic growth is coupled to primary production in oligptrophic lakes (rate is higher) —> increase light penetration
• heterotrophic growth is decoupled to primary production in a eutrophic lake (higher secondary rate–> greater number of dying primary producers and higher amount of DOM).
• if rate of primary production is too low entrophication does not occur