02433nas a2200241   4500008004100000245012500041210006900166260005200235300001200287490000700299520157400306653001101880653001701891653001501908653001601923653001401939653001001953100002701963700002201990700001902012700002302031856013702054       2009                        eng d00aMeiofaunal (re)colonization of the Arctic intertidal (Hornsund, Spitsbergen) after ice melting: role of wrack deposition0 aMeiofaunal recolonization of the Arctic intertidal Hornsund Spit  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGER  a243-2520 v323 aIntertidal meiobenthos of Hornsund-the southernmost fjord of Spitsbergen-was investigated between July and September 2005. Mean total meiofaunal densities ranged between 4.3 and 328 ind. 10 cm(-2). Nematode assemblages were impoverished in terms of the number of genera when compared with those from the western Spitsbergen coast (11 vs. 25-28 genera in total, respectively). It is suggested that severe environmental conditions in the southern part of Spitsbergen overcome the adaptation skills of many nematode species and hamper the establishment of a diverse community. Comparatively high nematode numbers on a beach subject to heavy macroalgal wrack input contrast sharply with numerically poor communities in sparse-wrack beaches (up to 315 vs. 31 ind. 10 cm(-2), respectively). It is suggested that the wrack input to the Arctic beach may substantially influence the richness and composition of the intertidal meiobenthic community. Nematode assemblages were dominated by extreme colonizers: Geomonhystera disjuncta and rhabditids. Their relatively high densities in beach sediments recorded at the beginning of July indicate their ability to recover rapidly after the winter period and to effective (re)colonization of the intertidal habitat just after the ice melt. Average concentration of rhabditids and monhysterids associated with macroalgal wrack deposited on the upper shore was as high as 52 x 10(3) individuals per gram of the substrate. It is hypothesized that nematodes can play a substantial role in the wrack decomposition in the Arctic intertidal.10aArctic10aColonization10aIntertidal10aMeiobenthos10anematodes10aWrack1 aUrban-Malinga, Barbara1 aDrgas, Aleksander1 aAmeryk, Anetta1 aTatarek, Agnieszka  uhttps://nematoda.myspecies.info/content/meiofaunal-recolonization-arctic-intertidal-hornsund-spitsbergen-after-ice-melting-role-wrac02423nas 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-naz03129nas a2200277   4500008004100000245010300041210006900144260008500213300001200298490000700310520214500317653001802462653001902480653001602499653001402515653002202529653002502551100001902576700002102595700002502616700002502641700002102666700001302687700001802700856013302718       2009                        eng d00aBiodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea0 aBiodiversity patterns of freeliving marine nematodes in a tropic  a24-28 OVAL RD, LONDON NW1 7DX, ENGLANDbACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  a179-1890 v853 aSpatial and temporal biodiversity patterns of free-living marine nematodes were studied in Cienfuegos Bay, a tropical semi-enclosed basin in the Caribbean Sea. Taxonomic (to species level) and functional (biological trait) approaches were applied for describing the assemblage structure and relating it to abiotic environment based on a sampling scheme in six subtidal stations and three months. Biological trait approach added relevant information to species pattern regarding relationships between diversity patterns and the abiotic environment. The most common morphotypes were deposit feeding nematodes, with colonising abilities of 2-3 (in a scale from 1 to 5), tail conical cylindrical or filiforme and body slender; and their abundance were correlated with depth, organic matter and silt/clay fraction. In spite of a high turnover of species, functional diversity of assemblages did not change notably in space and time. A result probably due to sampling of the habitat pool of species and to low heterogeneity of the studied muddy bottoms. Chemical pollution (organic enrichment and heavy metals) and hydrodynamic regime possibly drove the biodiversity patterns. Spatial distribution of assemblages support the existence of two well differentiated basins inside the bay, the northern basin more polluted than the southern one. The low hydrodynamic regime would determine a poor dispersion of nematodes resulting in high spatial variance in the assemblage structure; and also the associated hypoxic conditions and pollutants in sediments can explain the dominance of tolerant nematode species such as Daptonema oxycerca, Sabatieria pulchra, Terschellingia gourbaultae, and Terschellingia longicaudata. A comparison of spatial-temporal patterns of biodiversity between Cienfuegos Bay and other semi-enclosed bays in temperate regions suggests several similarities: nematode assemblages are strongly influenced by anthropogenic disturbance, temporal trends are weak or overridden by spatial ones, and few cosmopolitan genera/species tolerant to pollution and hypoxic conditions are dominant. (C) 2009 Elsevier Ltd. All rights reserved.10aCaribbean Sea10amarine ecology10aMeiobenthos10anematodes10aspecies diversity10atropical environment1 aArmenteros, M.1 aRuiz-Abierno, A.1 aFernandez-Garces, R.1 aPerez-Garcia, J., A.1 aDiaz-Asencio, L.1 aVincx, M1 aDecraemer, W.  uhttps://nematoda.myspecies.info/content/biodiversity-patterns-free-living-marine-nematodes-tropical-bay-cienfuegos-caribbean-sea