Arctic SDI catalogue
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
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.
Cite this data as: Teed LL, Goodwin C, Lawton P, Lacoursière-Roussel A, Dinning KM (2024) Multiple perspectives on the emergence of the invasive colonial tunicate Didemnum vexillum Kott, 2002 in the western Bay of Fundy, Atlantic Canada. BioInvasions Records 13(3): 713–738, https://doi.org/10.3391/bir.2024.13.3.12
Simple
- Date ( RI_367 )
- 2024-04-03
- Date ( RI_366 )
- 2024-03-05
- Status
- completed; complété RI_593
- Maintenance and update frequency
- notPlanned; nonPlanifié RI_542
- Keywords
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- Regional and National Core funds
- Marine Conservation Target
- Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
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- Oceans
- Coastal waters
- Aquatic ecosystems
- Environment
- Invasive species
- Use limitation
- Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)
- Access constraints
- license; licence RI_606
- Use constraints
- license; licence RI_606
- Classification
- unclassified; nonClassifié RI_484
- Spatial representation type
- vector; vecteur RI_635
- Metadata language
- eng; CAN
- Topic category
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- Biota
- Environment
- Oceans
- Begin date
- 2022-09-21
- End date
- 2022-09-22
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- Reference system identifier
- https://epsg.io / EPSG:4326 /
- Distribution format
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CSV
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Supporting Document;CSV;eng,fra
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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
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Start and end video Transect D vexillum Bay of Fundy
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Dataset;CSV;eng
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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
(
HTTPS
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Dataset;FGDB/GDB;eng
- OnLine resource
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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
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ESRI REST: Map Service
)
Web Service;ESRI REST;eng
- OnLine resource
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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
(
ESRI REST: Map Service
)
Web Service;ESRI REST;fra
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- File identifier
- 8ea6c28a-3d6c-47ef-8cf7-56790ee0c7f5 XML
- Metadata language
- eng; CAN
- Character set
- utf8; utf8 RI_458
- Hierarchy level
- dataset; jeuDonnées RI_622
- Date stamp
- 2025-03-05T11:24:33.78Z
- Metadata standard name
- North American Profile of ISO 19115:2003 - Geographic information - Metadata
- Metadata standard version
- CAN/CGSB-171.100-2009
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