THE BIOLOQY OF CORAL REEFS
247
tion with zooxanthellae in hermatypic corals would not be expected to
modify pre-existing growth forms-except possibly in respect of light
as discussed below. Thus in Acroporu confertu (Fig. 14) the terminal
polyps, which are large and pale, have a much higher calcification rate
1
5 cm
.
A
B
, Scm
1
C
, Scrn
D
FIQ. 15. Axial growth gradients measured in p g calcium p r mg of tiHLiue nitrogen per
hour in A, Acropora cewicornia (1, 71.5; 2, 49.0; 3, 30.0; 4. 15.0): B, A . pilmcrlcr
(1, 60.0; 2, 30.0; 3, 15.0; 4, 8 . 0 ) : C, Por~lea~urcalu ( I , 204; 2, 4.0; 3, 2 . 0 ) : D,
Colpophytlio notons (1, Y.0; 2, 8.0; 3, 10.0; 4 , 9.0; 6 , 104). (Aftor Gimtiu, IObJr.)
than the other polyps which although smaller have u, much higher
content of zoosanthcllae.
Thus in
Imuwliiiig voni in ~ i w i i
I ~ H Acroporn m-vicorni,v, A. palmata and Porites
furcxzln (Fig. 16, A, U, C) rates at tho apioal arcas are up to ten timm
\vliat0 tIlwy nro in Int,cmil or basal arras, whcrctrs in massivo colonios (D)
( ! ~ ~ l ( ~ i f i ( ~ i ~ ~ , i o i ~
nLt,c\x colitrol tho ovcntid forin of the colony.
247
tion with zooxanthellae in hermatypic corals would not be expected to
modify pre-existing growth forms-except possibly in respect of light
as discussed below. Thus in Acroporu confertu (Fig. 14) the terminal
polyps, which are large and pale, have a much higher calcification rate
1
5 cm
.
A
B
, Scm
1
C
, Scrn
D
FIQ. 15. Axial growth gradients measured in p g calcium p r mg of tiHLiue nitrogen per
hour in A, Acropora cewicornia (1, 71.5; 2, 49.0; 3, 30.0; 4. 15.0): B, A . pilmcrlcr
(1, 60.0; 2, 30.0; 3, 15.0; 4, 8 . 0 ) : C, Por~lea~urcalu ( I , 204; 2, 4.0; 3, 2 . 0 ) : D,
Colpophytlio notons (1, Y.0; 2, 8.0; 3, 10.0; 4 , 9.0; 6 , 104). (Aftor Gimtiu, IObJr.)
than the other polyps which although smaller have u, much higher
content of zoosanthcllae.
Thus in
Imuwliiiig voni in ~ i w i i
I ~ H Acroporn m-vicorni,v, A. palmata and Porites
furcxzln (Fig. 16, A, U, C) rates at tho apioal arcas are up to ten timm
\vliat0 tIlwy nro in Int,cmil or basal arras, whcrctrs in massivo colonios (D)
( ! ~ ~ l ( ~ i f i ( ~ i ~ ~ , i o i ~
nLt,c\x colitrol tho ovcntid forin of the colony.