Fig 1.
Tracks of the different scientific cruises surveys during austral summer and fall months.
Each single line of each cruise represents one day of survey effort. Black polygon indicates the region of study analyzed. White polygon indicates the primary range of distribution of Commerson’s dolphin in the southwest South Atlantic Ocean. Red polygon indicates the primary range of distribution of Peale’s dolphin in the southwest South Atlantic Ocean.
Fig 2.
Spatial distribution and size group of sightings of Commerson’s (A) and Peale’s (B) dolphin in relation to bathymetry from all scientific cruises surveys. Red line indicates the 200 m isobath. Green line indicates the 1000 m isobath.
Fig 3.
Relationships between the geographic position and the linear predictor in the model for Commerson’s dolphin.
The number in brackets in “s” gives the effective degrees of freedom (a measure of flexibility) of each term. The contours (and colours) are the effect of the spatial smooth on abundance on the scale of the link function.
Fig 4.
Spatially explicit model and uncertainty map of Commerson’s dolphin.
Density surface model of abundance of Commerson’s dolphin in the total study area (a). This map indicate more dolphins near the coast, mainly in waters around Puerto Deseado (~ 4600 km northing, 400km easting) and South of Santa Cruz Province, Magellan Strait and San Sebastian Bay (~ 4100km northing, 100km easting). The map of per cell coefficient of variation (CV) for the fitted model shows a gradient of values increasing with increasing distance to coast (b). Cell area is 100km2.
Fig 5.
Autocorrelation of deviance residuals between segments (lags) for the fitted density surface model of Commerson’s dolphin.
The dashed line represents the 95% confidence interval.
Fig 6.
Relationships between the smooth terms and the linear predictor in the model for Peale’s dolphin.
From left to right: (a) geographic position (easting, northing), (b) depth, and (c) sea surface temperature (SST). Dashed lines represent 95% confidence intervals. The number in brackets in each “s” gives the effective degrees of freedom (a measure of flexibility) of each term. The contours (and colours) are the effect of the spatial smooth on abundance on the scale of the link function.
Fig 7.
Spatially explicit model and uncertainty map of Peale’s dolphin.
Density surface model of average abundance of Peale’s dolphin in the study area analyzed (a); averages were taken over the time periods where surveys were conducted, predicting using the appropriate dynamic variances for that time period. The map of per cell coefficient of variation (CV) for the fitted model shows the largest uncertainty in the southeast portion of the study area (b); uncertainty was combined over multiple time periods by noting that the variance of a sum is the sum of the covariances. Cell area is 100km2.
Fig 8.
Autocorrelation of deviance residuals between segments (lags) for the fitted density surface model of Peale’s dolphin.
The dashed line represents the 95% confidence interval.