Monitoring Of Rocky-Bottom Macrobenthic Communities On Locations At Svalbard And Jan Mayen Using Digital Image Analysis ...

• Main Authors: Beuchel, Frank, Gulliksen, Bjørn
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2003 - J - Theme session 2024
• Subjects: Ecosystem observation, processes and dynamics; Arctic; Jan Mayen; Kongsfjord*; Subarctic; Svalbard
• Online Access: https://dx.doi.org/10.17895/ices.pub.25348483; https://ices-library.figshare.com/articles/conference_contribution/Monitoring_Of_Rocky-Bottom_Macrobenthic_Communities_On_Locations_At_Svalbard_And_Jan_Mayen_Using_Digital_Image_Analysis/25348483

No abstracts are to be cited without prior reference to the author.Temporal and spatial variations of epibenthic hard-bottom communities on high-arctic Svalbard and subarctic Jan Mayen are investigated by digital image analyses. The underwater photographs are taken using a metal frame (50 x 50 cm) and a Hasselblad SWC in an underwater housing. The technique is based on stereo- photographs developed by Thomas Lundälv. Digital image analysis was carried out using Adobe Photoshop and the plug-in Fovea Pro for measurements. An efficient method using the RGB- model of Photoshop was developed to retrieve community data of macrobenthic solitary and colonial organisms. The method is “non destructive” and therefore suitable for repetitively sampling. A long-term study (1977- today) of temporal variations and succession in Kongsfjord/Svalbard showed a correlation between increase of brown-algae and the sea urchin Strongylocentrotus sp. and the decline of the actinia Urticina sp. ...