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Sampling points used as inputs to the diversity hotspot analysis, carried out within the Northern Shelf Bioregion planning area. The hotspot analysis is relative to the spatial and temporal extent of these input data points; locations outside this footprint may have importance that is not reflected in the resulting hotspot anlaysis. |
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Sampling points used as inputs to the diversity hotspot analysis, carried out within the Northern Shelf Bioregion planning area. The hotspot analysis is relative to the spatial and temporal extent of these input data points; locations outside this footprint may have importance that is not reflected in the resulting hotspot anlaysis. |
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Data Collector/Processor/Holder: DFO |
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5000 |
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| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>Data source:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>PHMA longline </SPAN><SPAN>surveys</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Methods summary:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Fish diversity was calculated from CPUE (count/hook/hr) </SPAN><SPAN>from </SPAN><SPAN>Pacific Halibut Management Association (PHMA) surveys. PHMA surveys are standardized, depth-stratified random longline surveys that are carried out at depths of 20–260 m. All species caught are weighed or counted and identified to the lowest possible taxonomic level. Data was extracted from DFO's GFBio database on 18 April 2017, limiting the query to records quality-tagged as "fully usable". The PHMA dataset spans August 2006 - August 2016 and includes records taken in the months of August and September. Shannon Diversity (H') was calculated from CPUE </SPAN><SPAN>of fish species </SPAN><SPAN>using the diversity function in the R package ‘vegan’.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN /><SPAN>Shannon diversity values were used to detect hotspots of diversity within coastal areas using the Getis-Ord G* tool. The G* statistic represents the local neighbourhood sum compared proportionally to the sum of all features in the study area. When the local sum is significantly different from the expected sum, then that site is identified as a hotspot (Gi_Bin>0), a cold spot (Gi_Bin<0), or neutral (Gi_Bin=0). A 10 km distance value was used as the neighbourhood size. The false discovery rate correction was applied, which accounts for multiple testing and spatial dependence. </SPAN><SPAN>Absolute Gi_Bin values of 1, 2, and 3 correspond to 90, 95, and 99% confidence, respectively. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Using the Minimum Bounding Geometry Tool, convex hull polygons were drawn around groups of hotspot points (confidence ≥90%) containing 10 or more points. The resulting polygons were then buffered by 1 km and manually edited where needed to </SPAN><SPAN>exclude any large </SPAN><SPAN>areas </SPAN><SPAN>of </SPAN><SPAN>the polygons that did not include hotspot points.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>This layer was reviewed as part of a Canadian Science Advisory Secretariat (CSAS) regional peer review process on Nov 1-2, 2017 (Rubidge et al. 2018</SPAN><SPAN /><SPAN>).</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Date Represented: 200</SPAN><SPAN>6</SPAN><SPAN>-2016</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>Date Updated: Nov 2017</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>References:</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>Rubidge, E., Nephin, J., Gale, K.S.P., and Curtis, J. 2018. Reassessment of the Ecologically and Biologically Significant Areas (EBSAs) in the Pacific Northern Shelf Bioregion. DFO Can. Sci. Advis. Sec. Res. Doc. 2018/053. xii + 97 p.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This dataset has been provided by Fisheries and Oceans Canada to the Marine Protected Area Technical Team (MPATT) for use in MPA network planning and may not be used in any other project, distributed, sold, or transferred without written permission. Although the MPATT partners have taken all reasonable efforts to ensure the accuracy of the information, data is displayed as received from the source; MPATT members and the organizations they represent do not assume responsibility for any errors. Data layers may not by altered, transferred, loaned or leased. Advance, written permission from MPATT is required before sharing restricted spatial information with unauthorized users. Note that this dataset is not provided here as an official Government of Canada (GoC) geospatial dataset; this dataset is under review and may be revised and released in the future via the Canada’s Open Data Portal (http://open.canada.ca/en/open-maps). </SPAN></P></DIV></DIV></DIV> |
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Longline_Data_Footprint |
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| tags:
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["Fish","Longline","Hotspots","Diversity","Shannon Index"] |
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en-US |
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20000000 |
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