02419nas a2200253   4500008004100000245016200041210006900203260008400272300001200356490000700368520147600375653001301851653001401864653001401878653001901892653001301911100001501924700002001939700001701959700001701976700001901993700001602012856013702028       2008                        eng d00aAn assessment of the spatial heterogeneity of environmental disturbance within an enclosed harbour through the analysis of meiofauna and nematode assemblages0 aassessment of the spatial heterogeneity of environmental disturb  a24-28 OVAL RD, LONDON NW1 7DX, ENGLANDbACADEMIC PRESS LTD ELSEVIER SCIENCE LTD  a565-5760 v773 aSignificant spatial heterogeneity in the abundance and composition of meiofaunal and nematode assemblages was described inside the Genoa-Voltri harbour (Genoa, Italy) in relation to variation in the main environmental variables. In harbour sediments characterized by low Eh values and high organic matter concentrations, total meiofauna abundance was lower (948 +/- 919 ind 10 cm(-2)), nematode individual biomass was higher (0.17 +/- 0.07 mu g C), kinorhynchs and tanaids were completely absent, and the nematode assemblage was dominated by the genera Terschellingia, Sabatieria (pulchra group) and Paracomesoma. In contrast, in sediment characterized by lower levels of organic pollution, meiofaunal abundance was higher (1085 737 ind 10 cm(-2)), nematode individual biomass was lower (0.11 +/- 0.04 mu g C), kinorhynchs and tanaids were present and the nematodes were dominated by the genera Desmodora, Daptonema, Anticoma and Halalaimus. Environmental disturbance as assessed by the analysis of meiofaunal and nematode assemblages and sediment environmental variables changed significantly over a scale hundreds of meters, but did not follow a gradient from the inner to the outer harbour. Analysis of nematode assemblages is proposed as a useful tool for the identification of environmental risk areas which may assist in the development of good planning, monitoring programmes and better management of harbour ecosystems. (c) 2007 Elsevier Ltd. All rights reserved.10aharbours10ameiofauna10anematodes10aorganic matter10asediment1 aMoreno, M.1 aFerrero, T., J.1 aGallizia, I.1 aVezzulli, L.1 aAlbertelli, G.1 aFabiano, M.  uhttps://nematoda.myspecies.info/content/assessment-spatial-heterogeneity-environmental-disturbance-within-enclosed-harbour-through-a02699nas a2200253   4500008004100000245011300041210006900154260010100223300001200324490000700336520175000343653002302093653002202116653001402138653001402152653001902166653001402185100002202199700002002221700002202241700002302263700002202286856013702308       2009                        eng d00aOrganic matter composition, metazoan meiofauna and nematode biodiversity in Mediterranean deep-sea sediments0 aOrganic matter composition metazoan meiofauna and nematode biodi  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTD  a755-7620 v563 aTo identify the relationships between the abundance and biodiversity of deep-sea meiofauna and their food resources in the Tyrrhenian Sea (Mediterranean Sea), we have investigated the quantity and biochemical composition of sediment organic matter, the metazoan meiofauna abundance and biomass, and the nematode biodiversity at meso- (> 50 km) and/or local (< 1 km) scales. Sediment samples were collected at four deep-sea sites (from 3430 to 3581 m in depth), two of which were close to two seamounts. The analysis of variance revealed significant differences at both the meso- and local scales (i.e. between sites and between stations at each site), and showed that the variability at the mesoscale was much higher than that at the local scale. The values of all of the investigated variables were generally lowest in sediments surrounding the seamounts, suggesting a role for these submersed structures in the abundance of the metazoan meiofauna and their resources. The nematode assemblage composition changed significantly across the four sites. Among the 96 identified nematode species, 14 were exclusively seen in sediments around the two seamounts, and only three species were present at all sampling stations. Differences in the trophic structures of the nematode assemblages were also linked with differences in the biochemical composition of sediment organic matter. These results indicate that high beta-diversity in soft sediments around deep seamounts is associated with diversification of the benthic food webs, and suggest that while making the sediments poorer for food availability for benthic consumers, the presence of seamounts enhances the biodiversity in neighbouring sediments. (C) 2008 Elsevier Ltd. All rights reserved.10aDeep-sea sediments10aMediterranean Sea10ameiofauna10anematodes10aorganic matter10aSeamounts1 aPusceddu, Antonio1 aGambi, Cristina1 aZeppilli, Daniela1 aBianchelli, Silvia1 aDanovaro, Roberto  uhttps://nematoda.myspecies.info/content/organic-matter-composition-metazoan-meiofauna-and-nematode-biodiversity-mediterranean-deep-s