60
LilJia? cora! Cora! rtdole
Stytophora
Coru!
sOlld
Reef Environments
Aer-L----r------~~--_+------~~--_+----~
Jil
2{l
1{l
Il
-10
- 20
-J{)
- IjO
- SO
I
I
I
I
IIllmJ-Ae
: ~-Ac
I
Ac,~----~------~----~------~----~----~
At
Fig. 2.11. Flows of P04-P between some components of reef bottom biotopes and the
water column. For designations , cf. Fig. 2.10. (After Sorokin 1990c)
readily the inorganic nutrients in their high concentrations is an important
feature of them which actually increases the possibility of the use of
nutrients sources of reefs by their benthic autotrophic communities. The
increase of P04-P concentration in experiments up to 2-311 mol resulted in a
linear growth of its uptake rate (Ae) by periphyton (Fig. 2.10), while the
release flow (Ae) increased slightly. Further elevation of the concentration
of P04P caused the bending of the curve, which had the tendency to come
to level out at 9-10 11 mol. The rate of release stabilized at the level of
30-70% of that of the uptake. The balance values At at high P04-P content
were negative (net consumption continued). It comprised correspondingly
30-70% of actual P04-P consumption flow (Ae). The same as in living
corals, the P04-P uptake in the periphytonic communities does not depend
much on light conditions. This was observed also in microphytobenthos of
sands (Fig. 2.11). In dark the consumption flow slightly decreased, while the
release rates increased so that the net release increased and the At value
became more positive, especially in experiments with coral sands, when at
low P04-P concentrations the At at night became positive, changing from
slightly negative in daylight (Table 2.6).
Calculations of P04-P flows between the bottom biotopes of rubble
covered with periphyton and a water column m -2, day-l gave values of Ae
and A e within 3 to 10 mg P, while the balance values At were negligible -
LilJia? cora! Cora! rtdole
Stytophora
Coru!
sOlld
Reef Environments
Aer-L----r------~~--_+------~~--_+----~
Jil
2{l
1{l
Il
-10
- 20
-J{)
- IjO
- SO
I
I
I
I
IIllmJ-Ae
: ~-Ac
I
Ac,~----~------~----~------~----~----~
At
Fig. 2.11. Flows of P04-P between some components of reef bottom biotopes and the
water column. For designations , cf. Fig. 2.10. (After Sorokin 1990c)
readily the inorganic nutrients in their high concentrations is an important
feature of them which actually increases the possibility of the use of
nutrients sources of reefs by their benthic autotrophic communities. The
increase of P04-P concentration in experiments up to 2-311 mol resulted in a
linear growth of its uptake rate (Ae) by periphyton (Fig. 2.10), while the
release flow (Ae) increased slightly. Further elevation of the concentration
of P04P caused the bending of the curve, which had the tendency to come
to level out at 9-10 11 mol. The rate of release stabilized at the level of
30-70% of that of the uptake. The balance values At at high P04-P content
were negative (net consumption continued). It comprised correspondingly
30-70% of actual P04-P consumption flow (Ae). The same as in living
corals, the P04-P uptake in the periphytonic communities does not depend
much on light conditions. This was observed also in microphytobenthos of
sands (Fig. 2.11). In dark the consumption flow slightly decreased, while the
release rates increased so that the net release increased and the At value
became more positive, especially in experiments with coral sands, when at
low P04-P concentrations the At at night became positive, changing from
slightly negative in daylight (Table 2.6).
Calculations of P04-P flows between the bottom biotopes of rubble
covered with periphyton and a water column m -2, day-l gave values of Ae
and A e within 3 to 10 mg P, while the balance values At were negligible -