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Funded under DFO's Marine Conservation Targets Program, this optical imagery benthic survey documents the occurrence and estimated percent cover of the invasive colonial tunicate, Didemnum vexillum in seven drift-camera transects in the 'Head Harbour/West Isles Archipelago/The Passages' Ecologically and Biologically Significant Area (ESBA, ~113km2) in the western Bay of Fundy, New Brunswick, Canada. Occurrence data was derived from the use of high-resolution still images (n=386) taken periodically throughout each transect, and simultaneous continuous high-definition video. Video was divided into 20-second segments (here, we report the start and end location of each segment within a transect) and when D. vexillum was present in a video segment, frequency of occurrence was classified as common (continuous coverage/patches throughout the video segment), occasional (individual colonies of various sizes encountered >5 times throughout the video segment), or rare (small, isolated colonies encountered ≤5 times throughout the video segment). A video segment was deemed unusable and removed from the dataset if there was too much turbidity, or if the camera position was too high off-bottom to reliably image the seafloor. For still images, when D. vexillum was observed in an image, colony percent cover was categorized as >50%, 26-50%, 6-25%, or ≤5% of the images field of view (FOV). Distance travelled and distance between still images (m) was calculated using ArcGIS tools. FOV was estimated by measuring the length and width of a subset of still images and video frame grabs in ImageJ2, using 10-cm lasers for scale. FOV was standardized for each reported altitude, and area sampled (m2) along a continuous video segment was estimated by multiplying the average FOV by the distance travelled in that segment. D. vexillum was found in 44% of the area sampled at depths from 34 to 118m, deeper than previous reports globally of ~80m.<\/SPAN><\/P> Learn more or download this dataset from the Government of Canada's Open data portal.<\/SPAN><\/A><\/SPAN><\/P> /<\/SPAN><\/SPAN><\/P> Financé dans le cadre du Programme des objectifs de conservation marine, ce relevé benthique par imagerie optique documente l\u2019occurrence et le pourcentage estimé de la couverture du tunicier colonial envahissant Didemnum vexillum dans sept transects par caméra flottante dans la zone d\u2019importance écologique et biologique (ZIEB) de Head Harbour, West Isles et Les Passages (~113 km2), dans l\u2019ouest de la baie de Fundy, au Nouveau-Brunswick, au Canada. On a obtenu les données sur l\u2019occurrence au moyen d\u2019images fixes à haute résolution (n=386) prises périodiquement tout au long de chaque transect, et de vidéos à haute définition continues et simultanées. On a divisé les vidéos en segments de 20 secondes (nous indiquons l\u2019emplacement du début et de la fin de chaque segment dans un transect) et lorsque D. vexillum était présent dans un segment vidéo, on a classé la fréquence d\u2019occurrence comme commune (couverture continue/bancs tout au long du segment vidéo), occasionnelle (colonies individuelles de différentes tailles observées >5 fois tout au long du segment vidéo) ou rare (petites colonies isolées observées ≤5 fois tout au long du segment vidéo). Un segment vidéo était considéré comme inutilisable et retiré de l\u2019ensemble de données s\u2019il y avait trop de turbidité ou si la caméra était trop éloignée du fond pour permettre une imagerie fiable du fond marin. Pour les images fixes, si l\u2019on observait le D. vexillum dans une image, le pourcentage de couverture était catégorisé comme >50 %, 26-50 %, 6-25 %, ou ≤5 % du champ de vision de l\u2019image. On a calculé la distance parcourue et la distance entre les images fixes (m) à l\u2019aide d\u2019outils ArcGIS. On a estimé le champ de vision en mesurant la longueur et la largeur d\u2019un sous-ensemble d\u2019images fixes et d\u2019image vidéo dans ImageJ2, en utilisant des lasers de 10 m pour montrer l\u2019échelle. On a normalisé le champ de vision pour chaque altitude rapportée, et on a estimé la surface échantillonnée (m2) le long d\u2019un transect vidéo continu en multipliant le champ de vision moyen par la distance parcourue dans ce segment. On a observé le D. vexillum dans 44 % de la zone échantillonnée à des profondeurs de 34 m à 118 m, soit à des profondeurs plus grandes que celles rapportées (~80 m) dans les rapports précédents.<\/SPAN><\/P> Apprenez-en plus ou téléchargez cet ensemble de données à partir du portail de données ouvertes du gouvernement du Canada.<\/SPAN><\/A><\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
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"copyrightText": "Government of Canada; Fisheries and Oceans Canada; Coastal Ecosystem Science Division (CESD)/Gouvernement du Canada; Pêches et Océans Canada; Division des sciences des écosystèmes côtiers (DSEC)",
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"Title": "Occurrence and percent cover of the colonial invasive tunicate Didemnum vexillum from near-seafloor drift transect video imagery and high-resolution digital still images in the western Bay of Fundy/Occurrence et pourcentage de la couverture du tunicier colonial envahissant Didemnum vexillum d\u2019après des images vidéo de transects par caméra flottante près du fond marin et d\u2019images numériques fixes à haute résolution dans l\u2019ouest de la baie de Fundy",
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"Comments": " Funded under DFO's Marine Conservation Targets Program, this optical imagery benthic survey documents the occurrence and estimated percent cover of the invasive colonial tunicate, Didemnum vexillum in seven drift-camera transects in the 'Head Harbour/West Isles Archipelago/The Passages' Ecologically and Biologically Significant Area (ESBA, ~113km2) in the western Bay of Fundy, New Brunswick, Canada. Occurrence data was derived from the use of high-resolution still images (n=386) taken periodically throughout each transect, and simultaneous continuous high-definition video. Video was divided into 20-second segments (here, we report the start and end location of each segment within a transect) and when D. vexillum was present in a video segment, frequency of occurrence was classified as common (continuous coverage/patches throughout the video segment), occasional (individual colonies of various sizes encountered >5 times throughout the video segment), or rare (small, isolated colonies encountered ≤5 times throughout the video segment). A video segment was deemed unusable and removed from the dataset if there was too much turbidity, or if the camera position was too high off-bottom to reliably image the seafloor. For still images, when D. vexillum was observed in an image, colony percent cover was categorized as >50%, 26-50%, 6-25%, or ≤5% of the images field of view (FOV). Distance travelled and distance between still images (m) was calculated using ArcGIS tools. FOV was estimated by measuring the length and width of a subset of still images and video frame grabs in ImageJ2, using 10-cm lasers for scale. FOV was standardized for each reported altitude, and area sampled (m2) along a continuous video segment was estimated by multiplying the average FOV by the distance travelled in that segment. D. vexillum was found in 44% of the area sampled at depths from 34 to 118m, deeper than previous reports globally of ~80m.<\/SPAN><\/P>