Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregions

Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregions Conservation of marine biodiversity requires understanding the joint influence of ongoing environmental change and fishing pressure. Addressing this challenge requires robust biodiversity monitoring and analyses that jointly account for potential drivers of change. Here, we ask how demersal fish biodiversity in Canadian Pacific waters has changed since 2003 and assess the degree to which these changes can be explained by environmental change and commercial fishing. Using a spatiotemporal multispecies model based on fisheries independent data, we find that species density (number of species per area) and community biomass have increased during this period. Environmental changes during this period were associated with temporal fluctuations in the biomass of species and the community as a whole. However, environmental changes were less associated with changes in species’ occurrence. Thus, the estimated increases in species density are not likely to be due to environmental change. Instead, our results are consistent with an ongoing recovery of the demersal fish community from a reduction in commercial fishing intensity from historical levels. These findings provide key insight into the drivers of biodiversity change that can inform ecosystem based management. The layers provided represent three community metrics: 1) species density (i.e., species richness), 2) Hill-Shannon diversity, and 3) community biomass. All layers are provided at a 3 km resolution across the study domain for the period of 2003 to 2019. For each metric, we provide layers for three summary statistics: 1) the mean value in each grid cell over the temporal range, 2) the probability that the grid cell is a hotspot for that metric, and 3) the temporal coefficient of variation across all years. 2023-07-11 Fisheries and Oceans Canada Patrick.Thompson@dfo-mpo.gc.ca Nature and EnvironmentScience and Technologyspecies richnesscommunity biomassmarine spatial planningbiodiversity changeenvironmental changegroundfishecosystem-based managementspecies distribution modelsFisheriesMarine biologyFisheries resourcesEcosystemsTemperature Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregions - TIFFTIFF https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/gf_biodiversity_tiff.zip Data DictionaryCSV https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/Data_dictionary_EN_GF_biodiversity.csv ReferencesPDF https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/References_EN_FR_GF_biodiversity.pdf Data DictionaryCSV https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/Data_dictionary_FR_GF_biodiversity.csv Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregions - GIS Hub metadataPDF https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/GF_Biodiversity_metadata_FR.pdf Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregions - GIS Hub metadataPDF https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/GF_Biodiversity_metadata_EN.pdf Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregionsESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/MapServer Demersal (groundfish) community diversity and biomass metrics in the Northern and Southern shelf bioregionsESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Demersal_Community_Diversity_Biomass_Metrics_Northern_Southern_Shelf_Bioregions/MapServer

Conservation of marine biodiversity requires understanding the joint influence of ongoing environmental change and fishing pressure. Addressing this challenge requires robust biodiversity monitoring and analyses that jointly account for potential drivers of change. Here, we ask how demersal fish biodiversity in Canadian Pacific waters has changed since 2003 and assess the degree to which these changes can be explained by environmental change and commercial fishing. Using a spatiotemporal multispecies model based on fisheries independent data, we find that species density (number of species per area) and community biomass have increased during this period. Environmental changes during this period were associated with temporal fluctuations in the biomass of species and the community as a whole. However, environmental changes were less associated with changes in species’ occurrence. Thus, the estimated increases in species density are not likely to be due to environmental change. Instead, our results are consistent with an ongoing recovery of the demersal fish community from a reduction in commercial fishing intensity from historical levels. These findings provide key insight into the drivers of biodiversity change that can inform ecosystem based management.

The layers provided represent three community metrics: 1) species density (i.e., species richness), 2) Hill-Shannon diversity, and 3) community biomass. All layers are provided at a 3 km resolution across the study domain for the period of 2003 to 2019. For each metric, we provide layers for three summary statistics: 1) the mean value in each grid cell over the temporal range, 2) the probability that the grid cell is a hotspot for that metric, and 3) the temporal coefficient of variation across all years.

Data and Resources
View on Map

Contact Information

Delivery Point: Institute of Ocean Sciences 9860 West Saanich Road P.O. Box 6000

City: Sidney

Administrative Area: British Columbia

Postal Code: V8L 4B2

Country: Canada

Electronic Mail Address: Patrick.Thompson@dfo-mpo.gc.ca

Similar records