Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008

Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008 Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008 data is part of the publication Bay Scale Assessment of Nearshore Habitat Bras d'Or Lakes. A history of nearshore benthic surveys of Bras d’Or Lake from 2005 – 2011 is presented. Early work utilized drop camera and fixed mount sidescan. The next phase was one of towfish development, where camera and sidescan were placed on one platform with transponder-based positioning. From 2009 to 2011 the new towfish was used to ground truth an echosounder. The surveys were performed primarily in the northern half of the lake; from 10 m depth right into the shallows at less than 1 m. Different shorelines could be distinguished from others based upon the relative proportions of substrate types and macrophyte canopy. The vast majority of macrophytes occurred within the first 3 m of depth. This zone was dominated by a thin but consistent cover of eelgrass (Zostera marina L.) on almost all shores with a current or wave regime conducive to the growth of this plant. However, the eelgrass beds were frequently in poor shape and the negative impacts of commonly occurring water column turbidity, siltation, or possible localized eutrophication, are suspected. All survey data were placed into a Geographic Information System, and this document is a guide to that package. The Geographic Information System could be used to answer management questions such as the placement and character of habitat compensation projects, the selection of nearshore protected areas or as a baseline to determine long term changes. Vandermeulen, H. 2016. Video-sidescan and echosounder surveys of nearshore Bras d’Or Lake. Can. Tech. Rep. Fish. Aquat. Sci. 3183: viii + 39 p. Cite this data as: Vandermeulen H. Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008. Published May 2022. Coastal Ecosystems Science Division, Fisheries and Oceans Canada, Dartmouth, N.S. 2022-06-01 Fisheries and Oceans Canada DFO.CESDDataRequest-DSECDemandededonnes.MPO@dfo-mpo.gc.ca Nature and EnvironmentOceans Video-Sidescan and Echosounder Surveys of Nearshore Bras d’Or LakePDF https://waves-vagues.dfo-mpo.gc.ca/Library/366030.pdf Data DictionaryCSV https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Bay_Scale_Assessment_of_Nearshore_Habitat_Bras_dOr_Lake_Chapel_Is_2008/DataDictionary/Chapel_Island_DataDictionary.csv Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008ESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Bay_Scale_Assessment_of_Nearshore_Habitat_Bras_dOr_Lake_Chapel_Is_2008_En/MapServer Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008ESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Bay_Scale_Assessment_of_Nearshore_Habitat_Bras_dOr_Lake_Chapel_Is_2008_Fr/MapServer Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008TIFF https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Bay_Scale_Assessment_of_Nearshore_Habitat_Bras_dOr_Lake_Chapel_Is_2008/Downloads/TIFF.zip Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008FGDB/GDB https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Bay_Scale_Assessment_of_Nearshore_Habitat_Bras_dOr_Lake_Chapel_Is_2008/Downloads/Chapel_Island.gdb.zip

Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008 data is part of the publication Bay Scale Assessment of Nearshore Habitat Bras d'Or Lakes.

A history of nearshore benthic surveys of Bras d’Or Lake from 2005 – 2011 is presented.

Early work utilized drop camera and fixed mount sidescan. The next phase was one of towfish development, where camera and sidescan were placed on one platform with transponder-based positioning. From 2009 to 2011 the new towfish was used to ground truth an echosounder. The surveys were performed primarily in the northern half of the lake; from 10 m depth right into the shallows at less than 1 m. Different shorelines could be distinguished from others based upon the relative proportions of substrate types and macrophyte canopy. The vast majority of macrophytes occurred within the first 3 m of depth. This zone was dominated by a thin but consistent cover of eelgrass (Zostera marina L.) on almost all shores with a current or wave regime conducive to the growth of this plant. However, the eelgrass beds were frequently in poor shape and the negative impacts of commonly occurring water column turbidity, siltation, or possible localized eutrophication, are suspected. All survey data were placed into a Geographic Information System, and this document is a guide to that package. The Geographic Information System could be used to answer management questions such as the placement and character of habitat compensation projects, the selection of nearshore protected areas or as a baseline to determine long term changes.

Vandermeulen, H. 2016. Video-sidescan and echosounder surveys of nearshore Bras d’Or Lake. Can. Tech. Rep. Fish. Aquat. Sci. 3183: viii + 39 p.

Cite this data as: Vandermeulen H. Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008. Published May 2022. Coastal Ecosystems Science Division, Fisheries and Oceans Canada, Dartmouth, N.S.

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Delivery Point: Bedford Institute of Oceanography, 1 Challenger Drive, PO Box 1006

City: Dartmouth

Administrative Area: Nova Scotia

Postal Code: B2Y 4A2

Country: Canada

Electronic Mail Address: DFO.CESDDataRequest-DSECDemandededonnes.MPO@dfo-mpo.gc.ca

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