Integration
Demersal Fish Diversity
The upper-left figure depicts estimated demersal fish diversity throughout the study region. Unlike the mean diversity mapped in section 2, this surface was generated using estimates of total diversity for each 5 minute grid. The top 20% of predicted diversity is bounded by a thin black line. Though fish diversity was significantly correlated with survey effort in this model, high residual values overlapped areas of highest (top 20%) estimated diversity. This indicates that areas of highest diversity showed little effect of effort. As such, no residual mask is provided.
Figure 81b depicts fish density, and, like the diversity map, is based on an interpolation of total density (individuals per area swept (km2)) within each 5 minute grid cell. The top 20% of this estimate is bounded by a thin black line.
The grids in the upper figures were clipped using the respective standard error estimate for the interpolated surfaces (see data inventory). This was done to avoid unsupported extrapolation into poorly sampled areas.
The lower figure depicts the overlap between the top 20% of diversity and density.
INTEGRATION FISH DIVERSITY STANDARD ERROR
This figure depicts the standard error of interpolated fish
diversity throughout the study region. This standard error map represents
the interpolation (kriging) error and was used to clip the fish
diversity interpolations so that only those areas that fell in the
region of lowest 20% standard error (depicted in dark blue) are
used for subsequent display and analysis. This technique provides
a non-arbitrary method of restricting the analysis extent to those
areas that are relatively well sampled.
INTEGRATION FISH DIVERSITY RESIDUAL
This
figure depicts the interpolated residual fish diversity throughout
the study region. The residuals represent the variation in fish
diversity that is not explained by the linear relationship between
diversity and the natural log of survey effort. Residual maps are
used to correct for differences in the distribution of survey effort
and are necessary because of the correlation between diversity and
effort.
INTEGRATION FISH DENSITY STANDARD ERROR
This
figure depicts the standard error of interpolated fish density throughout
the study region. This standard error map represents the interpolation
(kriging) error and was used to clip the fish density interpolations
so that only those areas that fell in the region of lowest 20% standard
error (depicted in dark blue) are used for subsequent display and
analysis. This technique provides a non-arbitrary method of restricting
the analysis extent to those areas that are relatively well sampled.