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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

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
RI_415
  Government of Canada; Fisheries and Oceans Canada; Coastal Ecosystem Science Division (CESD) - Peter Lawton ( )
125, Marine Science Drive , St. Andrews , New Brunswick , E5B 0E4 , Canada
RI_408
  Government of Canada; Fisheries and Oceans Canada; Coastal Ecosystem Science Division (CESD) - Laura Teed ( )
125, Marine Science Drive , St. Andrews , New Brunswick , E5B 0E4 , Canada
Status
completed; complété RI_593
Maintenance and update frequency
notPlanned; nonPlanifié RI_542
Keywords
  • 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 )
  • 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
  • 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
  • CSV ( 1 )

  • ESRI REST ( 2.7.0 )

  • FGDB/GDB ( 2.7.0 )

  • ZIP ( 1 )

RI_412
  Government of Canada; Fisheries and Oceans Canada - Data Acquisition Assembly and Distribution / Acquisition, assemblage et distribution de donnée ( )
Bedford Institute of Oceanography, 1 Challenger Drive, PO Box 1006 , Dartmouth , Nova Scotia , B2Y 4A2 , Canada
OnLine resource
Data dictionary ( HTTPS )

Supporting Document;CSV;eng,fra

OnLine resource
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 )

Dataset;CSV;eng

OnLine resource
Start and end video Transect D vexillum Bay of Fundy ( HTTPS )

Dataset;CSV;eng

OnLine resource
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 )

Dataset;FGDB/GDB;eng

OnLine resource
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;eng

OnLine resource
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

OnLine resource
Photos CON002 ( HTTPS )

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Photos CON008 ( HTTPS )

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Video CON002 and 003 ( HTTPS )

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Video CON004 and 005 ( HTTPS )

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Video CON006 ( HTTPS )

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OnLine resource
Video CON007 and 008 ( HTTPS )

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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
RI_414
  Government of Canada; Fisheries and Oceans Canada; Coastal Ecosystem Science Division (CESD) - CESD Data Manager / DSEC Gestionnaire de données ( Data Manager )
125, Marine Science Drive , St. Andrews , New Brunswick , E5B 0E4 , Canada
 
 

Overviews

overview
Drift transects video in the western Bay of Fundy

Spatial extent

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Keywords


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