ETP_Dolphin {Distance}

Eastern Tropical Pacific spotted dolphin survey

Description

Observers aboard tuna vessels detecting dolphin schools along with a number of possibly useful covariates for modelling the detection function.

Format

A data.frame with 1090 rows and 13 variables:

• Region.Label stratum labels (only one)

• Area size (nmi) of each stratum

• Sample.Label transect labels

• Effort transect length (nmi)

• object object ID

• distance perpendicular distance (nmi)

• LnCluster natural log of cluster size

• Month month of detection

• Beauf.class Beaufort sea state

• Cue.type initial cue triggering detection

• Search.method observer method making the detection

• size cluster size

• Study.Area study area name

Details

Several different search methods included in these data

• 0 binoculars from crows nest

• 2 binoculars from elsewhere on ship

• 3 helicopter searching ahead of ship

• 5 radar detects of seabirds above dolphin schools

Several cue types were also recorded by observers.

• 1 seabirds above the school

• 2 water splashes

• 3 unspecified

• 4 floating objects such as logs

Source

Inter-American Tropical Tuna Commission