Oceanography The Official Magazine of
The Oceanography Society
Article Abstract

The Nazaré submarine canyon extends ~ 210 km westward from the coast of Portugal, down to a water depth of > 4300 m. The considerable habitat heterogeneity found throughout the canyon is affected by strong currents and high turbidity, especially in the upper parts of the canyon. The canyon morphology comprises steep slopes, scarps, terraces, and overhangs, and a deeply incised thalweg is found in the lower part of the canyon. The seabed within the canyon is composed of varying proportions of rock and sediments that range from sand to fine mud. This great variation in physical environment is reflected by the varied fauna inhabiting the canyon. Diversity tends to decrease with depth, but there is also continual replacement of species with increasing water depth. Certain groups, such as the gorgonians and sea lilies, tend to be found on rocky surfaces, while large protozoans dominate the sediments at 3400-m depth. In addition to describing the fauna of Nazaré Canyon, we discuss experiments undertaken as part of the HERMES project to elucidate the ecosystem function processes operating in the deeper parts of the canyon.

Citation

Tyler, P., T. Amaro, R. Arzola, M.R. Cunha, H. de Stigter, A. Gooday, V. Huvenne, J. Ingels, K. Kiriakoulakis, G. Lastras, D. Masson, A. Oliveira, A. Pattenden, A. Vanreusel, T. Van Weering, J. Vitorino, U. Witte, and G. Wolff. 2009. Europe’s grand canyon: Nazaré submarine canyon. Oceanography 22(1):46–57, https://doi.org/10.5670/oceanog.2009.05.

References

Arzola, R.G., R.B. Wynn, G. Lastras, D.G. Masson, and P.P.E. Weaver. 2008. Sedimentary features and processes in the Nazaré and Setúbal submarine canyons, west Iberian margin. Marine Geology 250:64–88.

Curdia, J., S. Carvalho, A. Ravara, J.D. Gage, A.M. Rodrigues, and V. Quintino. 2004. Deep macrobenthic communities from Nazaré Submarine Canyon (NW Portugal). Scientia Marina 68:171–180.

de Stigter, H., W. Boer, P.A. de Jesús Mendes, C.C. Jesús, L. Thomsen, G.D. van den Berg, and T.C.E. van Weering. 2007. Recent sediment transport and deposition in Nazaré Canyon, Portuguese continental margin. Marine Geology 246:144–164.

Epping, E., C. van der Zee, K. Soetaert, and W. Helder. 2002. On the oxidation and burial of organic carbon in sediments of the Iberian margin and Nazaré Canyon (NE Atlantic). Progress in Oceanography 52:399–431.

Garcia, R., K.A. Koho, H.C. De Stigter, E. Epping, E. Koning, and L. Thomsen. 2007. Distribution of meiobenthos in the Nazaré canyon and adjacent slope (western Iberian Margin) in relation to sedimentary composition. Marine Ecology Progress Series 340:207–220.

Koho, K.A., T.J. Kouwenhoven, H.C. de Stigter, and G.J. van der Zwaan. 2007. Benthic foraminifera in the Nazaré canyon, Portuguese continental margin: Sedimentary environments and disturbance. Marine Micropaleontology 66:27–51.

Lastras, G., R. Arzola, D.G. Masson, R.B. Wynn, V.A.I. Huvenne, V.A.I., Hühnerbach, and M. Canals. In Press. Geomorphology and sedimentary features in the central Portuguese canyons, Western Iberian Margin. Geomorphology.

Oliveira, A., A.I. Santos, A. Rodrigues, and J. Vitorino. 2007. Sedimentary particle distribution and dynamics on the Nazaré canyon system and adjacent shelf (Portugal). Marine Geology 246:105–122.

Roberts, D., H.M. Moore, J. Berges, J.W. Patching, M.W. Carton, and D.F. Eardly. 2001. Sediment distribution, hydrolytic enzyme profiles and bacterial activities in the guts of Oneirophanta mutabilis, Psychropotes longicauda and Pseudostichopus villosus: What do they tell us about digestive strategies of abyssal holothurians? Progress in Oceanography 50(1–4): 443–458.

Vanney, J.R., and D. Mougenot. 1990. A Gouf-type canyon, the Canhão-da-Nazaré (Portugal). Oceanologica Acta 13(1):1–14.

Weaver, P.E. 2005. The geobiology of the Nazaré and Setubal Canyons, Portuguese Continental Margin. Cruise report No. 1 RRS Discovery cruise D297 27 Jul–16 Aug 2005. National Oceanography Centre, Southampton, 41 pp.

Weaver, P.P.E., D.S.M. Billett, A. Boetius, R. Danovaro, A. Freiwald, and M. Sibuet. 2004. Hotspot ecosystem research on Europe’s deep-ocean margins. Oceanography 17(4):132–143.

Weaver, P.P.E., R.B. Wynn, N.H. Kenyon, and J. Evans. 2000. Continental margin sedimentation, with special reference to the north-east Atlantic margin. Sedimentology 47(s1):239–256, doi:10.1046/j.1365-3091.2000.0470s1239.x

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