Table 1. Density estimations (D) (fish/300m2) and coefficients of variations (CV) for studied species and the total of groupers for different combinations of transects types and census widths in Cabo de Palos and Cabo Tiñoso.
Note that CST values in Cabo Tiñoso were derived from simulations. CST = Conventional Strip Transect. TRT = Tracked Roaming Transect. FW3 and FW10 = Fixed Width of 3 and 10 m for each side of the transects, respectively. DS = Distance Sampling Method. The census area of each survey is detailed in m2 considering total transect lengths and 6 and 20 m width for FW´s estimators and 40 m width for the DS estimator.
| Site | Transect type/ Census method/ Area (m2) | Total groupers | E. marginatus | M. rubra | E.costae | S. umbra | D. dentex | M. aguila | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D | %cv | D | %cv | %cv | D | %cv | D | %cv | D | %cv | D | %cv | |||
| Cabo Palos | CST FW3 2400 m2 | 3.8 | 107.4 | 2.0 | 80.2 | 1.3 | 185.2 | 0.5 | 185.2 | 0.8 | 155.3 | 1.3 | 111.1 | 0.4 | 198.4 |
| TRT FW3 7400 m2 | 4.4 | 23.6 | 3.0 | 27.3 | 1.0 | 47.3 | 0.3 | 96.0 | 6.8 | 107.8 | 0.6 | 51.5 | 0.1 | 116.7 | |
| CST FW10 8000 m2 | 3.3 | 52.0 | 2.1 | 27.0 | 1.0 | 112.0 | 0.2 | 118.0 | 12.2 | 159.0 | 0.6 | 75.0 | 0.2 | 169.0 | |
| TRT FW10 24666 m2 | 1.9 | 38.7 | 1.5 | 42.8 | 0.3 | 50.3 | 0.1 | 64.2 | 3.6 | 70.5 | 1.4 | 84.7 | 0.1 | 51.6 | |
| CST DS 16000 m2 | 4.2 | 18.1 | 3.6 | 13.5 | - | - | - | - | - | - | 1.5 | 38.0 | - | - | |
| TRT DS 49000 m2 | 2.9 | 7.4 | 2.6 | 9.6 | - | - | - | - | - | - | 1.2 | 30.0 | - | - | |
| Cabo Tiñoso | CST FW3 5700 m2 | 0.1 | 285.0 | 0.1 | 408.0 | - | - | 0.1 | 414.0 | 0.2 | 238.0 | 0.3 | 227.0 | - | - |
| TRT FW3 21600 m2 | 0.1 | 96.9 | 0.1 | 108.3 | - | - | 0.0 | 137.3 | 0.2 | 177.3 | 0.2 | 88.7 | - | - | |
| CST FW10 19000 m2 | 0.1 | 279.6 | 0.1 | 381.0 | - | - | 0.1 | 413.6 | 0.4 | 225.6 | 0.5 | 255.6 | - | - | |
| TRT FW10 72000 m2 | 0.1 | 99.0 | 0.0 | 100.2 | - | - | 0.0 | 200.0 | 0.1 | 128.6 | 0.1 | 95.9 | - | - | |