02423nas a2200265   4500008004100000245014800041210006900189260010100258300001400359490000700373520140100380653001301781653001401794653001601808653001101824653001401835653003101849653002201880653002701902100001901929700003101948700002201979700001902001856013702020       2009                        eng d00aNematode diversity and its relation to the quantity and quality of sedimentary organic matter in the deep Nazare Canyon, Western Iberian Margin0 aNematode diversity and its relation to the quantity and quality   aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTD  a1521-15390 v563 aSamples collected in the deep Nazare Canyon and at the adjacent slope, during the HERMES RRS Discovery D297 cruise (2005), were analysed for metazoan meiofauna, nematode structure and diversity and its relation to quality and quantity of sedimentary organic material. The amount and quality of organic matter available for direct consumption was much higher in the canyon compared to the slope and positively correlated with high nematode abundances (795-1171 ind. 10 cm(-2)) and biomass (93.2-343.5 mu g dry weight 10 cm(-2)). thus leading to higher standing stocks. Canyon nematode assemblages also showed particular adaptations (e.g. higher trophic complexity, variability of nematode morphology, and presence of opportunistic genera) to canyon conditions, particularly in the deeper sediment layers. The Nazare Canyon's nematode diversity was slightly lower than that of the adjacent slope and its assemblages were characterised by a higher dominance of certain genera. Still, the canyon contributes considerably to total Western Iberian Margin diversity due to different assemblages present compared to the slope. Furthermore, the harsh conditions in terms of hydrodynamic disturbance and the high organic matter flux are likely to have a negative impact on the establishment of species rich meiobenthic communities, especially in the canyon axis. (C) 2009 Elsevier Ltd. All rights reserved.10adeep sea10adiversity10aMeiobenthos10aNazare10anematodes10aSedimentary organic matter10aSubmarine canyons10aWestern Iberian Margin1 aIngels, Jeroen1 aKiriakoulakis, Konstadinos1 aWolff, George, A.1 aVanreusel, Ann  uhttps://nematoda.myspecies.info/content/nematode-diversity-and-its-relation-quantity-and-quality-sedimentary-organic-matter-deep-naz02770nas a2200253   4500008004100000245013000041210006900171260008400240300001200324490000700336520180700343653001102150653001402161653001402175653001402189653002002203653002202223100002702245700003002272700003202302700001802334700002702352856013702379       2006                        eng d00aComparison of nematode communities in Baltic and North Sea sublittoral, permeable sands - Diversity and environmental control0 aComparison of nematode communities in Baltic and North Sea subli  a24-28 OVAL RD, LONDON NW1 7DX, ENGLANDbACADEMIC PRESS LTD ELSEVIER SCIENCE LTD  a224-2380 v703 aThe structure of free-living nematode communities was investigated seasonally at two sandy locations representing typical shallow sublittotal, permeable environments of the North Sea and the Baltic Sea. At the Baltic study site the chlorophyll and organic carbon concentrations in the sediment were, on average, four times lower than at the North Sea. Highest nematode densities (1674-4100 ind. 10 cm(-2)) and a higher number of free-living nematode genera (66) were recorded in the North Sea (Baltic: 206-1227 ind. 10 cm(-2), 30 genera). Despite lower salinity and lower food availability the less dense and less diverse Baltic nematode community was similar in generic composition to the North Sea community. At the North Sea site, all trophic groups according to Wieser's classification were present with omnivores/predators, dominated by Viscosia, prevailing and followed by epistrate-feeders. In the food-limited Baltic community, non-selective deposit feeders (mainly Ascolaimus, Axonolaimus and Daptonema) and omnivores/predators dominated by Enoplolaimus were the most abundant trophic groups while selective deposit feeders were absent or their contribution was negligible. An analysis of the vertical generic distribution revealed highest diversity of the Baltic community in deeper sediment layers, below the sediment surface affected by ripple migration and near the interface of oxic and anoxic conditions. The diversity pattern in the North Sea sediment was more variable but generally showed high diversity in the upper centimetre of the sediment. These observations suggest that food supply and sediment oxygenation are the most important factors influencing the vertical pattern of nematode generic diversity in sublittoral, permeable sands. (c) 2006 Elsevier Ltd. All rights reserved.10aBaltic10adiversity10anematodes10aNorth Sea10apermeable sands10asublittoral sands1 aUrban-Malinga, Barbara1 aHedtkamp, Stefanie, I. C.1 avan Beusekom, Justus, E. E.1 aWiktor, Jozef1 aWeslawski, Jan, Marcin  uhttps://nematoda.myspecies.info/content/comparison-nematode-communities-baltic-and-north-sea-sublittoral-permeable-sands-diversity-a