Temporal changes (1989–1999) in deep-sea metazoan meiofaunal assemblages on the Porcupine Abyssal Plain,NE Atlantic |
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| Institution: | 1. Hellenic Centre of Marine Research, P.O. Box 2214, Heraclion Crete 710 03, Greece;2. DZMB-Senckenbergische Naturforschende Gesellschaft, Naturmuseum und Forschungsinstitut Senckenberg, Deutsches Zentrum fur Marine Biodiversitätsforschung, Wilhelmshaven, Germany;3. Ocean Biogeochemistry and Ecosystems Research Group, National Oceanography Centre, Southampton SO14 3ZH, UK;4. Universiteit Gent, Faculteit Wetenschappen, Vakgroep Biologie, Afdeling Mariene Biologie, Gent, Belgium;1. National Oceanography Centre, Southampton, SO14 3ZH, UK;2. National Oceanography Centre, Southampton, SO14 3ZH, UK;3. National Oceanography Centre, Southampton, SO14 3ZH, UK;1. Department of Natural Sciences, Savannah State University, 3219 College St., Box 20600, Savannah, GA 31404, USA;2. Florida State University Coastal & Marine Laboratory, Florida State University, 3618 Coastal Highway 98, St. Teresa, FL 32358, USA;1. Laboratory of Ichthyology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece;2. Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK;3. Stazione Zoologica ‘Anton Dohrn’, Villa Comunale, 80121 Naples, Italy;4. Maurice-Lamontagne Institute, Fisheries and Oceans Canada, Mont-Joli, QC, Canada G5H 3Z4;5. GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany;6. Leibniz Institute for Baltic Sea Research, Seestr. 15, 18119 Warnemünde, Germany;1. Institut de Ciències del Mar (ICM-CSIC), Passeig Marítim de la Barceloneta, 37-49, Barcelona 08003, Spain;2. Department of Conservation Biology, Estación Biológica de Doñana (EBD-CSIC), Avda. Américo Vespucio s/n, Sevilla 41092, Spain;3. Centre d’Ecologie Fonctionnelle et Evolutive, UMR 5175, CNRS – Université de Montpellier – Université Paul-Valéry Montpellier – EPHE, Montpellier, France;4. Institut de Recherche pour le Développement, UMR MARBEC, Avenue Jean Monnet BP 171, Sète Cedex 34203, France;1. Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia;2. Environ-Ecological Engineering Institute Co. Ltd., 110-54 Millak-Dong, Suyeong-gu, Busan 48280, Korea;3. Department of Oceanography, Pukyong National University, 599-1 Daeyeon-dong, Busan 48513, Korea;4. Oceanic Climate & Ecology Research Division, National Institute of Fisheries Science, 216 Gijanghaean-ro, Gijang-eup, Gijang-gun, Busan 46083, Korea;1. Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany;2. University of Victoria, Victoria, BC, Canada;3. Laurentian University, Sudbury, ON, Canada;4. Geomar, Kiel, Germany;1. Università Politecnica delle Marche, Dipartimento di Scienze della Vita e dell''Ambiente, 60131 Ancona, Italy;2. Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy |
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| Abstract: | Trends among major metazoan meiofaunal taxa were investigated based on 56 deployments of a multicorer at 10 time points over a period of 11 years (1989–1999) at the Porcupine Abyssal Plain Sustained Observatory site (PAP-SO: 48°50′N 16°30′W, 4850 m depth). This area is characterised by a strong seasonality in the deposition of organic matter to the seafloor and by the massive increase in the density of holothurian species since 1996, the so-called ‘Amperima event’. Total meiofaunal densities ranged from 346 to 1074 ind.×10 cm?2 and showed a significant increase with time when time was represented by cruises, years and the ‘Amperima period’ (1996–1999) vs. the pre-Amperima period (1989–1994). This pattern was driven mainly by the nematodes, which were the dominant taxon (～90% of total abundance). The third most abundant group, the polychaetes, also increased significantly in abundance over the time series, while the ostracods showed a significant decrease. Most other taxa, including the second-ranked group, the copepods (harpacticoids and nauplii), did not exhibit significant temporal changes in abundance. Ordination of taxon composition showed a shift from the pre-Amperima to the Amperima periods, a trend supported by the significant correlation between the x-ordinate and time. The majority (52–75%) of meiofaunal animals inhabited the top 2 cm of the 5 cm sediment cores analysed. There were significant increases in the proportion of total meiofauna, nematodes and copepods (but not polychaetes) inhabiting the 0–1 cm layer over time (represented by cruises) and between the pre-Amperima and Amperima periods in the case of copepods and polychaetes. During the intensively sampled period (1996–1997), there were indications of seasonal changes in the vertical distribution patterns of total meiofauna and nematodes within the sediment. We discuss the potential link between temporal variations in organic matter flux to the seafloor and meiofaunal populations, considering both qualitative and quantitative changes in fluxes and how they may be linked to climate variations. |
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