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Service Description: Abstract
The assessment of the status of eelgrass (Zostera marina) beds at the bay-scale in turbid, shallow estuaries is problematic. The bay-scale assessment (i.e., tens of km) of eelgrass beds usually involves remote sensing methods such as aerial photography or satellite imagery. These methods can fail if the water column is turbid, as is the case for many shallow estuaries on Canada’s eastern seaboard. A novel towfish package was developed for the bay-scale assessment of eelgrass beds irrespective of water column turbidity. The towfish consisted of an underwater video camera with scaling lasers, sidescan sonar and a transponder-based positioning system. The towfish was deployed along predetermined transects in three northern New Brunswick estuaries. Maps were created of eelgrass cover and health (epiphyte load) and ancillary bottom features such as benthic algal growth, bacterial mats (Beggiatoa) and oysters. All three estuaries had accumulations of material reminiscent of the oomycete Leptomitus, although it was not positively identified in our study. Tabusintac held the most extensive eelgrass beds of the best health. Cocagne had the lowest scores for eelgrass health, while Bouctouche was slightly better. The towfish method proved to be cost effective and useful for the bay-scale assessment of eelgrass beds to sub-meter precision in real time.
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Learn more or download this dataset from the Government of Canada's Open data portal.
Apprenez-en plus ou téléchargez cet ensemble de données à partir du portail de données ouvertes du gouvernement du Canada.
Map Name: Bay_Scale_Assessment_of_Eelgrass_Beds_Using_Sidescan_and_Video_Tabusintac_2008_En
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Service Item Id: 95be0a22f54348a08e55c4e7239dec2e
Copyright Text: Fisheries and Oceans Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, NS, Canada B2Y 4A2
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Units: esriDecimalDegrees
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: Bay Scale Assessment of Eelgrass Beds Using Sidescan and Video - Tabusintac 2008 / Évaluation des herbiers de zostère à l’échelle de la baie à l’aide d’équipement vidéo et de balayage latéral – Tabusintac 2008
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Comments: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Abstract</SPAN></P><P><SPAN>The assessment of the status of eelgrass (Zostera marina) beds at the bay-scale in turbid, shallow estuaries is problematic. The bay-scale assessment (i.e., tens of km) of eelgrass beds usually involves remote sensing methods such as aerial photography or satellite imagery. These methods can fail if the water column is turbid, as is the case for many shallow estuaries on Canada’s eastern seaboard. A novel towfish package was developed for the bay-scale assessment of eelgrass beds irrespective of water column turbidity. The towfish consisted of an underwater video camera with scaling lasers, sidescan sonar and a transponder-based positioning system. The towfish was deployed along predetermined transects in three northern New Brunswick estuaries. Maps were created of eelgrass cover and health (epiphyte load) and ancillary bottom features such as benthic algal growth, bacterial mats (Beggiatoa) and oysters. All three estuaries had accumulations of material reminiscent of the oomycete Leptomitus, although it was not positively identified in our study. Tabusintac held the most extensive eelgrass beds of the best health. Cocagne had the lowest scores for eelgrass health, while Bouctouche was slightly better. The towfish method proved to be cost effective and useful for the bay-scale assessment of eelgrass beds to sub-meter precision in real time.</SPAN></P><P><SPAN>Open Data</SPAN></P><P><A href="https://open.canada.ca:443/data/en/dataset/d1c58bc6-69d4-47b2-bb19-988f88233900" STYLE="text-decoration:underline;"><SPAN>Learn more or download this dataset from the Government of Canada's Open data portal.</SPAN></A></P><P><A href="https://ouvert.canada.ca:443/data/fr/dataset/d1c58bc6-69d4-47b2-bb19-988f88233900" STYLE="text-decoration:underline;"><SPAN>Apprenez-en plus ou téléchargez cet ensemble de données à partir du portail de données ouvertes du gouvernement du Canada.</SPAN></A></P></DIV></DIV></DIV>
Subject: Bay Scale Assessment of Eelgrass Beds Using Sidescan and Video - Tabusintac 2008
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Keywords: Estuary,Mapping,Sidescan,Seagrass,Oceans
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