Submarine canyons: hotspots of benthic biomass and productivity in the deep sea

Proceedings of the Royal Society B: Biological Sciences - Tập 277 Số 1695 - Trang 2783-2792 - 2010
Fabio C. De Leo1, Craig R. Smith1, Ashley A. Rowden2, David A. Bowden2, Malcolm R. Clark2
1Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, USA
2NIWA, National Institute of Water and Atmospheric Research, 301 Evans Bay Parade, Greta Point, Private Bag 14-901, Wellington, New Zealand

Tóm tắt

Submarine canyons are dramatic and widespread topographic features crossing continental and island margins in all oceans. Canyons can be sites of enhanced organic-matter flux and deposition through entrainment of coastal detrital export, dense shelf-water cascade, channelling of resuspended particulate material and focusing of sediment deposition. Despite their unusual ecological characteristics and global distribution along oceanic continental margins, only scattered information is available about the influence of submarine canyons on deep-sea ecosystem structure and productivity. Here, we show that deep-sea canyons such as the Kaikoura Canyon on the eastern New Zealand margin (42°01′ S, 173°03′ E) can sustain enormous biomasses of infaunal megabenthic invertebrates over large areas. Our reported biomass values are 100-fold higher than those previously reported for deep-sea (non-chemosynthetic) habitats below 500 m in the ocean. We also present evidence from deep-sea-towed camera images that areas in the canyon that have the extraordinary benthic biomass also harbour high abundances of macrourid (rattail) fishes likely to be feeding on the macro- and megabenthos. Bottom-trawl catch data also indicate that the Kaikoura Canyon has dramatically higher abundances of benthic-feeding fishes than adjacent slopes. Our results demonstrate that the Kaikoura Canyon is one of the most productive habitats described so far in the deep sea. A new global inventory suggests there are at least 660 submarine canyons worldwide, approximately 100 of which could be biomass hotspots similar to the Kaikoura Canyon. The importance of such deep-sea canyons as potential hotspots of production and commercial fisheries yields merits substantial further study.

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Tài liệu tham khảo

10.1016/j.dsr.2009.05.014

10.1098/rspb.2009.0098

10.4319/lo.2006.51.5.2077

10.1016/j.jmarsys.2003.06.006

10.1038/nature05827

10.1016/S0278-4343(00)00083-2

10.1016/S0399-1784(00)88949-5

10.1038/nature05271

Clark M. R. Anderson O. F.& Dunn M. R.. 2003 New Zealand Fishery Assessment Report No. 2003/60. Ministry of Fisheries Wellington New Zealand p. 51.

Company J. B., 2008, Climate influence on deep sea populations, PLoS ONE, 1431, 1

10.1007/s00227-001-0747-8

10.1002/9780470995129

10.1038/360576a0

Gage J., 1996, Deep-sea biology: a natural history of organisms at the deep-sea floor, 504

10.1016/j.pocean.2008.01.001

10.1016/j.jmarsys.2003.10.008

10.2113/gsjfr.22.2.129

10.1126/science.241.4863.359

10.3354/meps270055

10.1175/1520-0485(1997)027<0697:TROASS>2.0.CO;2

Issacs J. D., 1975, Active animals of the deep-sea floor, Sci. Am., 233, 85

10.1080/00288330809509937

10.1016/j.dsr.2007.04.001

King M., 1987, Distribution and ecology of deep-water caridean shrimps (Crustacea: Natantia) near tropical Pacific Islands, Bull. Mar. Sci., 41, 192

10.1029/95JC02901

10.1175/1520-0485(2002)032<1890:IWIMSC>2.0.CO;2

10.1146/annurev.ecolsys.32.081501.114002

10.1016/S0025-3227(99)00075-4

Ministry of Fisheries. 2009 Report for the Fisheries Assessment Plenary May 2009: stock assessments and yield estimates. Wellington New Zealand p. 1036.

10.1016/S0967-0637(03)00094-3

10.4319/lo.2007.52.1.0299

10.1016/j.margeo.2007.04.017

Rasband W. S.. 2009 I mage J . Bethesda MD: US National Institutes of Health. See http://rsb.info.nih.gov/ij/.

Rex M. A., 1983, The sea, 453

10.3354/meps317001

Rowe G. T., 1983, The sea, 96

10.1016/0198-0149(82)90113-3

10.1126/science.163.3874.1419

10.3354/meps340073

Shepard F. P., 1966, Submarine canyons and other sea valleys, 381

10.1126/science.183.4121.195

10.1038/323251a0

10.1017/CBO9780511751790.030

10.4319/lo.1992.37.7.1543

10.1016/S0278-4343(00)00082-0

Thompson R. M. C.. 2001 Gazetteer of seafloor features in the New Zealand region. Technical report NIWA New Zealand p. 64.

10.1163/156854003321824567

10.1002/9780470995129.ch8

10.1038/372047a0

10.3354/meps186137

10.1111/j.1439-0485.2009.00351.x

10.1357/002224090784984560

Yoklavich M. M., 2000, Habitat associations of deep-water rockfishes in a submarine canyon: an example of a natural refuge, Fish. Bull., 98, 625

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Proceedings of the Royal Society B: Biological Sciences

Tập 277 Số 1695

2783-2792

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