coastal_planktonic_system

Question 1

what are the main components (reasons) of plankton losses

Answer 1

grazing/predation
sedimentation
DMA

Question 2

what does DMA stand for?

Answer 2

dilution (water amss coming in )
mixing (with deep waters)
advection (water mass coming in)

Question 3

what are ressources for growth of

1. phytoplankton
2. animals

Answer 3

1. • inorgainc nutrients (P,N)
   • light
2. • food (energy)
   • essential nutrients

Question 4

how does phytoplankton reacts to high nutreint suppyl?

which phytoplankton group reacts the most to the high nutreint supply ?

Answer 4

primary production increases

1. nanoautotrophs
2. microautotrophs
3. picoautotrophs

Question 5

how does fertlization (input of N, P) affects taxonomic groups of phytoplankton?

Answer 5

all groups are affected;

most strongly diatoms

Question 6

are phytoplankton biomass affected by zooplankton grazing in a natural system, where all factors are interacting?

Answer 6

yes:

high phytoplankton abundance –> high grazing –> decrease of phytoplankton

Question 7

how does the the loss of carnivore fish affects phytoplankton abundance?

Answer 7

loss of carnivore fish –> high abundance of small fishes –> low abundance of zooplankton –> high abundance of phytoplankton and eutrophication / algae blooms

Question 8

how does zooplankton (heterotrpphic biomass) react to increases food supply

Answer 8

• feeding activity enhances but the biomass only increases moderately
• -> low biomass response
• increased bacteria activity

Question 9

who is eating who? 
bacteria 
ciliates 
HNF
copepods

Answer 9

bacteria food for HNF and ciliates
HNF food for ciliates and copepodes 
ciliates are food for copepodes 
copepodes food for....
etc

Question 10

predation pressure:

how does high abundance HNF influences their food?

Answer 10

no relationship

Question 11

predation pressure:

how does ciliates effect the abundance of HNF?

Answer 11

moderate predation effect

• ciliates affect some top down control of HNF biomass

Question 12

predation pressure:

how does copepodess affect the abundance of ciliates?

Answer 12

stronge predation effect

-copepodes affect some top down control of ciliat biomass

Question 13

give examples for “top down” controlls

Answer 13

grazing, predation

Question 14

give examples for “bottom up” controlls

Answer 14

nutrients, co2 light, food, essential nutrienst = resources for growth