Single Species Analysis
Use this module to explore the distribution for an individual
species, by selecting species and dataset (e.g., region and
season) from the dropdowns below. The interpolated
(predicted) spatial distribution as well as the raw survey
locations will be displayed on the map and can be toggled on
and off using the radio buttons below. Time-series graphs of
the key indicators of a species distribution (e.g. change in
latitude, depth) can be found in the side panel tab
“Distribution metrics”. You can explore the area overlap
between the selected species and an area of interest in the
“Area Overlap Analysis” tab.
The interpolation
and distribution metrics presented on this website are
calculated for each species in each survey after the survey
is standardized to a consistent spatial footprint. See the Technical
Document and metadata for more
information on how the survey data are processed for the
analysis presented on this website, and see the regional
databases listed therein for more detailed information on
each survey and for access to the raw unprocessed data.
Regional Summary
Use this module to explore the aggregate change in location of marine species caught in a survey at a regional level. As species distributions respond to many environmental and biological factors, looking at changes at the community level, aggregating across all species or across species groups, allows for a more complete picture of the general trends in marine species distributions in a region.
Species diversity maps highlight areas of low and high biodiversity as expected in the survey. These maps are calculated using the Shannon index which considers both abundance and evenness of a species in an area. The Shannon index (H’) is calculated for each raster grid cell by stacking up the individual species interpolated biomass layers with the following equation:
where pi is the proportion of total individuals belonging to the ith species and R is richness, equal to the total number of species in the dataset.
The graphs below show the annual change in the latitude and depth averaged across species that are caught every year in the selected survey dataset
Change in Average LatitudeThe annual change in latitude averaged across a core set of species caught every year in the survey. This indicator is calculated by first calculating the difference between each year's average latitude and that of the starting year for each species, and then averaging the differences across species in a region.
On average species in region have moved Xkm north/south from XXXX-XXXX to YYYY-YYYY.
Negative values indicate that the species are moving south, and positive values indicate that the species are moving north
Change in Average Depth
The annual change in depth averaged across a core set of species caught every year in the survey. This indicator is calculated by first calculating the difference between each year's average depth and that of the starting year for each species, and then averaging the differences across species in a region.
On average species in region have moved Xkm deeper/shallower from XXXX-XXXX to YYYY-YYYY.
Negative values indicate that the species are moving deeper, and positive values indicate that the species are moving shallower
The table below summarizes the change in latitude, and depth for all species included in the regional average calculations above.
