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Version: 1.6 Status: Approved A new version will be created automatically if this content is modified.
Teresa Amaro, Stazione Zoological Anton Dohrn, Italy
Veerle Huvenne, National Oceanography Centre, Southampton, UK
Louise Allcock, National University of Ireland, Galway, Ireland
Tahmeena Aslam, University of East Anglia, UK
Jaime Davies, Plymouth University, UK
Roberto Danovaro, Polytechnic University of Marche, Italy & Stazione Zoological Anton Dohrn, Italy
Henko de Stigter, Royal Netherlands Institute for Sea Research, The Netherlands
Gerard Duineveld, Royal Netherlands Institute for Sea Research, The Netherlands
Cristina Gambi, Polytechnic University of Marche, Italy
Andy Gooday, National Oceanography Centre, Southampton, UK
Laetitia Gunton, National Oceanography Centre, Southampton, UK
Rob Hall, University of East Anglia, UK
Kerry Howell, Plymouth University, UK
Jeroen Ingels, Plymouth Marine Laboratory, UK
Kostas Kiriakoulakis, Liverpool John Moores University, UK
Catherine Kershaw, Liverpool John Moores University, UK
Mark Lavaleye, Royal Netherlands Institute for Sea Research, The Netherlands
K Robert, National Oceanography Centre, Southampton, UK
Heather Stewart, British Geological Survey, Edinburgh, UK
David Van Rooij, University of Ghent, Belgium
Martin White, National University of Ireland, Galway, Ireland
Annete Wilson, National University of Ireland, Galway, Ireland
The Whittard Canyon – a case study of submarine canyon processes

Submarine canyons are large geomorphological features that incise continental shelves and slopes around the world. They are often suggested to be biodiversity and biomass hotspots, although there is no consensus about this in the literature. Nevertheless, many canyons do host diverse faunal communities but, owing to our lack of understanding of the processes shaping and driving this diversity, appropriate management strategies have yet to be developed. Here, we integrate all the current knowledge of one single system, the Whittard Canyon (Celtic Margin, NE Atlantic), including the latest research on geology, sedimentology, geomorphology, oceanography, ecology, and biodiversity in order to address this issue. The Whittard Canyon is an active system in terms of sediment transport. The net suspended sediment transport is mainly up-canyon causing sedimentary overflow in some upper canyon areas. Occasionally sediment gravity flow events do occur, some possibly the result of anthropogenic activity. However, the role of these intermittent gravity flows in transferring labile organic matter to the deeper regions of the canyon appears to be limited. More likely, any labile organic matter flushed downslope in this way becomes strongly diluted with bulk material and therefore of little food value for benthic fauna. Instead, the fresh organic matter found in the Whittard Channel mainly arrives through vertical deposition and lateral transport of phytoplankton blooms that occur in the area during spring and summer. The response of the Whittard Canyon fauna to these processes is different in different groups. Foraminiferal abundances are higher in the upper parts of the canyon and on the slope than in the lower canyon. Meiofaunal abundances in the upper and middle part of the canyon are higher than on adjacent slopes, but lower in the deepest part. Mega- and macrofauna abundances are higher in the canyon compared with the adjacent slope and are higher in the eastern than the western branch. These faunal patterns reflect the fact that the Whittard Canyon encompasses considerable environmental heterogeneity, related to a combination of organic matter trapping, current regimes (due to focused internal tides) and different substrates. We conclude that coordinated observations of processes driving faunal patterns are needed at a fine scale in order to understand the functioning of communities in this and other submarine canyons. 

Theme 1: Canyon processes in the space-time continuum (formation, evolution, circulation)
Oral Presentation
Whittard Canyon, Processes, Faunal patterns