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First megafaunal diel and seasonal deep-sea monitoring by crawler within methane Barkley canyon (NEPTUNE-Canada)

AutorDoya, C. ; Aguzzi, Jacopo ; Purser, Autun; Thomsen, L.; Company, Joan B.
Fecha de publicación13-nov-2013
EditorEuropean Multidisciplinary Seafloor Observatory
CitaciónEMSO Ocean Observatories Challenges and Progress : Scientific ideas, early results and infrastructure development : Abstracts volume: 28 (2013)
ResumenCabled observatory video-imaging recent advances now enable faunal monitoring at high frequency over extended periods of time (from seconds to years). Temporally-scheduled video imaging can be used to carry out a reliable faunal monitoring avoiding biases in population and biodiversity assessments due to behavioral rhythms (i.e. which can occur under the form of rhythmic massive population displacements). In this study, we carried out a linear video-transect with the Deep sea crawler Wally I. The crawler is empowered and controlled though NEPTUNE ocean observatory network at a cold-seep in a small plateau at ~890 m depth in the Barkley Canyon (Canadian NE Pacific) and can be operated in real-time remotely from any computer worldwide via the internet. We counted the number of megafauna and note ethological events appearing in back and forth video-transects taken at 4-h frequency for five consecutive days every month over eight months. Current speed (as marker of the local internal tidal regime), temperature, salinity, fluorescence, methane and oxygen concentration environmental variables were measured at high temporal resolution (all frequencies <3 minutes, depending on sensor) throughout the observational period. Time series, periodogram and waveform analysis (for period and rhythms phase determination respectively) were carried out. The most abundant species (corresponding to the 90% of the counts) were in descending order of abundance Sablefish (Anaplopoma fimbria), neptunids (Neptunidae spp.), hagfish (Eptatretus spp.), the jellyfish Poralia rufescens, the family of fish Scorpanidae spp. and the Grooved tanner crab (Chionoecetes tanneri). A peak in abundance in early and mid-summer occur both in Sablefish and Grooved tanner crab. Grooved tanner crab show a second peak in March coinciding with the detection of reproduction behavior. A lineal, a quadratic, a cubic and a quartic regression did not show any significant relation of the crawler activity on the megafauna over the monthly five consecutive days of survey. These preliminary results are discussed in relation to the feasibility of video monitoring with crawling mobile platforms of reduced mobility but with the elevated capacity of high frequency data acquisition over long term periods
DescripciónEuropean Multidisciplinary Seafloor Observatory Conference Ocean Observatories Challenges and Progress (EMSO Conference OOCP), Scientific ideas, early results and infrastructure development, 13-15 November 2013, Rome.-- 1 page
Versión del editorhttp://www.emso-eu.org/site/old-website/events/emso-conference-oocp-2013/information.html
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