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-wrac02770nas 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