Parent Layer: KDE_Analyses_Coral_Sponge_2016_Point_Data

Name: KDE_Analyses_Coral_Sponge_2016_Eastern_Arctic

Display Field: Mission

Type: Feature Layer

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Description: Kernel density estimation (KDE) utilizes spatially explicit data to model the distribution of a variable of interest. It is a simple non-parametric neighbour-based smoothing function that relies on few assumptions about the structure of the observed data. It has been used in ecology to identify hotspots, that is, areas of relatively high biomass/abundance, and in 2010 was used by Fisheries and Oceans Canada to delineate significant concentrations of corals and sponges. The same approach has been used successfully in the Northwest Atlantic Fisheries Organization (NAFO) Regulatory Area. Here, we update the previous analyses with the catch records from up to 5 additional years of trawl survey data from Eastern Canada, including the Gulf of St. Lawrence. We applied kernel density estimation to create a modelled biomass surface for each of sponges, small and large gorgonian corals, and sea pens, and applied an aerial expansion method to identify significant concentrations of these taxa. We compared our results to those obtained previously and provided maps of significant concentrations as well as point data co-ordinates for catches above the threshold values used to construct the significant area polygons. The borders of the polygons can be refined using knowledge of null catches and species distribution models of species presence/absence and/or biomass.

Service Item Id: 9e419e7d6916424292e37aa2311ff219

Copyright Text: Fisheries and Oceans Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, NS, Canada B2Y 4A2

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• Value: Large Gorgonian Coral,Absence,Alfredo
  Label: Large Gorgonian Coral, Absence, Alfredo
  Description: N/A
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• Value: Large Gorgonian Coral,Absence,Campelen
  Label: Large Gorgonian Coral, Absence, Campelen
  Description: N/A
  Symbol:
  
• Value: Large Gorgonian Coral,Not Significant-Threshold < 1 kg,Alfredo
  Label: Large Gorgonian Coral, Not Significant-Threshold < 1 kg, Alfredo
  Description: N/A
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  Label: Large Gorgonian Coral, Not Significant-Threshold < 30 kg, Campelen
  Description: N/A
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  Label: Large Gorgonian Coral, Significant-Threshold >= 1 kg, Alfredo
  Description: N/A
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• Value: Large Gorgonian Coral,Significant-Threshold >= 30 kg,Campelen
  Label: Large Gorgonian Coral, Significant-Threshold >= 30 kg, Campelen
  Description: N/A
  Symbol:
  
• Value: Sea Pen,Absence,Alfredo
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  Label: Sea Pen, Absence, Campelen
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  Label: Sea Pen, Not Significant-Threshold < 0.1 kg, Campelen
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• Value: Sea Pen,Not Significant-Threshold < 0.1 kg,Cosmos
  Label: Sea Pen, Not Significant-Threshold < 0.1 kg, Cosmos
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  Label: Sea Pen, Not Significant-Threshold < 0.2 kg, Alfredo
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  Label: Small Gorgonian Coral, Absence, Campelen
  Description: N/A
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• Value: Small Gorgonian Coral,Not Significant-Threshold < 0.02 kg,Campelen
  Label: Small Gorgonian Coral, Not Significant-Threshold < 0.02 kg, Campelen
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• Value: Small Gorgonian Coral,Significant-Threshold >= 0.02 kg,Alfredo
  Label: Small Gorgonian Coral, Significant-Threshold >= 0.02 kg, Alfredo
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• Value: Small Gorgonian Coral,Significant-Threshold >= 0.02 kg,Campelen
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  Label: Sponge, Not Significant-Threshold < 40 kg, Cosmos
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  Label: Sponge, Not Significant-Threshold < 80 kg, Alfredo
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  Label: Sponge, Significant-Threshold >= 20 kg, Campelen
  Description: N/A
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  Label: Sponge, Significant-Threshold >= 40 kg, Cosmos
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  Label: Sponge, Significant-Threshold >= 80 kg, Alfredo
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