Description

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. Published May 2022. Coastal Ecosystems Science Division, Fisheries and Oceans Canada, Dartmouth, N.S.

Resources

Name	Format	Description	Link
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - St. Andrews 2011	HTML		https://open.canada.ca/data/en/dataset/023a311a-ece8-4986-80fb-c9cb16ca2d40
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Chapel Island 2008	HTML		https://open.canada.ca/data/en/dataset/2bafcc93-ebb8-4cf8-ab30-be45c405adb1
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Wagmatcook 2007	HTML		https://open.canada.ca/data/en/dataset/53cc3681-6026-4fbb-af75-a225ac905caf
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - River Denys 2005 - 2009	HTML		https://open.canada.ca/data/en/dataset/aa5c0710-3b94-49e7-99df-67522d054fc5
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Eskasoni 2007	HTML		https://open.canada.ca/data/en/dataset/d6c5d06d-d9c8-4f0f-93d6-b81a15a05678
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Malagawash 2007 - 2008	HTML		https://open.canada.ca/data/en/dataset/db58d599-20e2-4bae-a591-01507e3f75dd
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake - Whycocomagh 2007	HTML		https://open.canada.ca/data/en/dataset/e94742d9-465f-4564-be91-5aa3c7f84964
Bay Scale Assessment of Nearshore Habitat Bras d'Or Lake	PDF		https://waves-vagues.dfo-mpo.gc.ca/Library/366030.pdf

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