Deep, diverse and definitely different: unique attributes of the world's largest ecosystem

Biogeosciences - Tập 7 Số 9 - Trang 2851-2899
Eva Ramirez‐Llodra1, Angelika Brandt2, Roberto Danovaro3, Ben De Mol4, Elva Escobar‐Briones5, C. R. German6, Lisa A. Levin7, Pedro Martínez Arbizu8, Lénaïck Menot9, Pål Buhl‐Mortensen10, Bhavani E. Narayanaswamy11, Craig R. Smith12, Derek P. Tittensor13, Paul A. Tyler14, Ann Vanreusel15, Michael Vecchione16
1Institut de Ciències del Mar, CSIC. Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
2Biocentrum Grindel and Zoological Museum, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany
3Department of Marine Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
4GRC Geociències Marines, Parc Científic de Barcelona, Universitat de Barcelona, Adolf Florensa 8, 08028 Barcelona, Spain
5Universidad Nacional Autónoma de México, Instituto de Ciencias del Mar y Limnología, A.P. 70-305 Ciudad Universitaria, 04510 Mèxico, México
6Woods Hole Oceanographic Institution, MS #24, Woods Hole, MA 02543, USA
7Integrative Oceanography Division, Scripps Institution of Oceanography, La Jolla, CA, 92093-0218 USA
8Deutsches Zentrum für Marine Biodiversitätsforschung, Südstrand 44, 26382 Wilhelmshaven, Germany
9Ifremer Brest, DEEP/LEP, BP 70, 29280 Plouzane, France
10Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway
11Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, UK
12Department of Oceanography, University of Hawaii, 1000 Pope Road, Honolulu, HI 97822, USA
13Department of Biology, Dalhousie University, Halifax, NS, Canada
14National Oceanography Centre, University of Southampton, European Way, Southampton, SO14 3ZH, UK
15University Ghent, Marine Biology, Krijgslaan 281, 9000 Ghent, Belgium
16National Museum of Natural History, NMFS National Systematics Laboratory, Washington, DC, 20013-7012, USA

Tóm tắt

Abstract. The deep sea, the largest biome on Earth, has a series of characteristics that make this environment both distinct from other marine and land ecosystems and unique for the entire planet. This review describes these patterns and processes, from geological settings to biological processes, biodiversity and biogeographical patterns. It concludes with a brief discussion of current threats from anthropogenic activities to deep-sea habitats and their fauna. Investigations of deep-sea habitats and their fauna began in the late 19th century. In the intervening years, technological developments and stimulating discoveries have promoted deep-sea research and changed our way of understanding life on the planet. Nevertheless, the deep sea is still mostly unknown and current discovery rates of both habitats and species remain high. The geological, physical and geochemical settings of the deep-sea floor and the water column form a series of different habitats with unique characteristics that support specific faunal communities. Since 1840, 28 new habitats/ecosystems have been discovered from the shelf break to the deep trenches and discoveries of new habitats are still happening in the early 21st century. However, for most of these habitats the global area covered is unknown or has been only very roughly estimated; an even smaller – indeed, minimal – proportion has actually been sampled and investigated. We currently perceive most of the deep-sea ecosystems as heterotrophic, depending ultimately on the flux on organic matter produced in the overlying surface ocean through photosynthesis. The resulting strong food limitation thus shapes deep-sea biota and communities, with exceptions only in reducing ecosystems such as inter alia hydrothermal vents or cold seeps. Here, chemoautolithotrophic bacteria play the role of primary producers fuelled by chemical energy sources rather than sunlight. Other ecosystems, such as seamounts, canyons or cold-water corals have an increased productivity through specific physical processes, such as topographic modification of currents and enhanced transport of particles and detrital matter. Because of its unique abiotic attributes, the deep sea hosts a specialized fauna. Although there are no phyla unique to deep waters, at lower taxonomic levels the composition of the fauna is distinct from that found in the upper ocean. Amongst other characteristic patterns, deep-sea species may exhibit either gigantism or dwarfism, related to the decrease in food availability with depth. Food limitation on the seafloor and water column is also reflected in the trophic structure of heterotrophic deep-sea communities, which are adapted to low energy availability. In most of these heterotrophic habitats, the dominant megafauna is composed of detritivores, while filter feeders are abundant in habitats with hard substrata (e.g. mid-ocean ridges, seamounts, canyon walls and coral reefs). Chemoautotrophy through symbiotic relationships is dominant in reducing habitats. Deep-sea biodiversity is among of the highest on the planet, mainly composed of macro and meiofauna, with high evenness. This is true for most of the continental margins and abyssal plains with hot spots of diversity such as seamounts or cold-water corals. However, in some ecosystems with particularly "extreme" physicochemical processes (e.g. hydrothermal vents), biodiversity is low but abundance and biomass are high and the communities are dominated by a few species. Two large-scale diversity patterns have been discussed for deep-sea benthic communities. First, a unimodal relationship between diversity and depth is observed, with a peak at intermediate depths (2000–3000 m), although this is not universal and particular abiotic processes can modify the trend. Secondly, a poleward trend of decreasing diversity has been discussed, but this remains controversial and studies with larger and more robust data sets are needed. Because of the paucity in our knowledge of habitat coverage and species composition, biogeographic studies are mostly based on regional data or on specific taxonomic groups. Recently, global biogeographic provinces for the pelagic and benthic deep ocean have been described, using environmental and, where data were available, taxonomic information. This classification described 30 pelagic provinces and 38 benthic provinces divided into 4 depth ranges, as well as 10 hydrothermal vent provinces. One of the major issues faced by deep-sea biodiversity and biogeographical studies is related to the high number of species new to science that are collected regularly, together with the slow description rates for these new species. Taxonomic coordination at the global scale is particularly difficult, but is essential if we are to analyse large diversity and biogeographic trends.

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