CO 
jC 
0) 
0) 
£ 
Ld 
D 
_Q 
CD 
to 
• 
o 
c 
■ MM 
CO 
> 
a 
a> 
> 
-Q 
.2 -a 
m C 
2 TO 
m CJ 
ro o 
c “ 
a> ^ 
C 4-» 
.E <o 
"D 0) 
a> c 
co C 
CD 
4- 
* 
O 
O 
CO 
4-* 
0) 
CD 
4-* 
CD 
CD 
• 
4- 
CD 
o 
D 
cr 
>« 
CD 
1- 
CD 
T3 
E 
0) 
E 
Id , c 
D 
£ P 
CO 
s o. 
CD ® 
CD O 
cc > 
IE ^ 
+ “’ "D 
c c 
— CD 
T5 
CD 00 
> T- 
o fvT 
to cN 
-Q T- 
O 
C 
o 
■ ■■■ 
4—' 
CD 
CD 
CD 
C 
a> 
E 
co :> 
6 o 
CNJ CD 
0) “O 
s>— 0) 
D ^ 
05 
(ujo) 1 N 3 IAJI 03 S 
010 O& 3 V 30 Hld 3 Q N\ 73 IAJ 
NOTE: The quantity of aerated sediment visible against the thin aquarium 
wall is expressed as mean depth of aerated sediment, although its distribution 
is related to burrow location as indicated in Figure 20-3. 
NOTE: Dotted line represents mean depth of aerobic sediment in sediment- 
filled, thin-walled aquaria in absence of benthic organisms. Mean aerobic sed¬ 
iment depth is measured through planimetry of vertical burrowing pattern (e.g. 
Figure 20-3). 
314 
