Table 1 Comparison of the survey time required in the field for each method used, and number of marine iguanas estimated/counted at four colonies in the Galápagos Archipelago, Ecuador
From: A pilot study to estimate the population size of endangered Galápagos marine iguanas using drones
Locality | Survey time in the field (h.) | Marine Iguanas counted | CMR | ||||
|---|---|---|---|---|---|---|---|
CMR | Simple counts (ground) | Aerial counts (drones) | Simple counts (ground) | Aerial counts (drones) | N (CI) | SE | |
La Lobería (San Cristóbal Island) | 9:30 | 3:30 | 3:34 | 102 | 138 | 161 (145–177) | 8.37 |
Playa Blanca (San Cristóbal Island) | 5:36 | 2:21 | 3:37 | 60 | 70 | 78 (69–87) | 4.45 |
El Miedo (Santa Fe Island) | 6:20 | 3:10 | 1:00 | 252 | 285 | 468 (426–510) | 21.50 |
Gardner Islet (near Española Island) | 8:57 | 5:13 | 2:56 | 215 | 260 | 373 (339–407) | 17.07 |