Table 9.1
Classes for single-beam ASC surveys in coral reef environments
Source # classes Defined by biota Defined by geomorphology
Defined by relief Defined by substrate only Defined by sediment properties System (frequency)
1
5
Coral
Patch Reef/Hardbottom
Sand
RoxAnn (not given)
Seagrass on Sand
Fine Sand
2a
5
5 classes of grain size
RoxAnn (50 kHz)
2b
5
5 classes of grain size
QTC IV (38 kHz)
3
3
Coral Dominated
Sand
RoxAnn (200 kHz)
Mud
4
4
High Rugosity-Hard
QTC V (50 and 200 kHz)
Low Rugosity-Hard
High Rugosity-Soft
Low Rugosity-Soft
5
2
QTC V (50 kHz)
Sand
Hard Substrate
6a
4
Rocky Ridges
Rock and Hardground
Less-Sorted Sand
QTC V (50 kHz)
Well-Sorted Sand
6b
2
Hardground
ECHOplus (50 kHz)
Sand
7
2
Hardbottom
QTC V (50 kHz)
Sediment
8
5
[2m
Relief and 5–50% Hardbottom
QTC V (50 kHz)
[2m
Relief and 50–100% Hardbottom
\2m
Relief and 5–50% Hardbottom
\2m
Relief and 50–100% Hardbottom
95–100% Sediment
9a
5
Colonized Pavement/Linear Reef
Sand over Hardbottom
Sand/Sand-Deep
BioSonics DT-X
Aggregated Patch Reef/Ridge Spur and Groove
(38 kHz)
9b
5
Colonized Pavement/Linear Reef
Sand over Hardbottom
Sand/Sand-Deep
BioSonics DT-X
Aggregated Patch Reef
Ridge/Spur and Groove
(418 kHz)
(continued)
228
G. Foster et al.