c297d901c896065253182035a3c77aa4 English dataset Becky Seeley Data Archive for Seabed Species and Habitats (DASSH) 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk pointOfContact 2019-08-09 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::4258 1998-2000 Stour and Orwell Estuaries Unicomarine Limited macrobenthos survey 2000-12-31 publication 1998-01-01 creation 2000-12-31 revision DASSH-554 http://www.dassh.ac.uk Marine benthic species abundance data from ecological survey of the Stour and Orwell estuaries. Trial placements of dredged fine sediment were undertaken, during the winter of 1998-1999 and 1999-2000, at several sites in the Stour estuary. Unicomarine Ltd carried out three macrobenthos surveys to assess the impact of sediment replenishment on fauna. The first survey was carried out in October 1998, stations were sampled round the placement site with additional reference stations further away from the placement site (39 stations in total). The survey was repeated in April 1999, after placement of sediment over the winter of 1998-1999, and again in May 2000 after a second placement of sediment. During the 2000 survey 43 stations were sampled including three additional reference stations towards the banks. In 1999 there was an increase in coarse material, compared with 1998, and some species associated with stones were more common. In 2000 the sediment data indicated that production of coarse sediment was similar to 1998 but the amount of silt/clay material had increased slightly, as would be expected from the fine sediments deposited in the area. The dominant community groups, biotopes and taxa found were similar for all surveys and there was little change in total numbers of taxa and individuals between years. Two major community groups were discernible in all years. Minor changes in community structure could be traced from year to year and related to fluctuating populations of dominant taxa. The reasons for the small changes could not be confidently identified. Some were clearly the result of changes in the sediment regime but it is not clear whether those changes may have been a result of sediment placement or of natural fluctuations. M. F. Dyer Data Archive for Seabed Species and Habitats (DASSH) Unicomarine 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk originator Becky Seeley Data Archive for Seabed Species and Habitats (DASSH) 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk custodian notPlanned Database Delimited Marine Environmental Data and Information Network Geology Habitats and biotopes Species distribution GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Zoobenthos generic abundance Fauna abundance per unit area of the bed Shellfish abundance and biomass in water bodies Habitat characterisation Sediment grain size parameters SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Released under DASSH terms and conditions otherRestrictions Released under DASSH terms and conditions https://www.dassh.ac.uk/terms-and-conditions English geoscientificInformation biota biota Charting Progress 2 Sea Areas 2009-06-18 creation Southern North Sea 0.9970 1.4282 51.8765 52.0913 1998-01-01 2000-12-31 Dyer, M.F, 2000. Stour estuary. Benthic survey of sediment placement sites. Results of pre and post placement benthic sampling in 1998 and 1999. Report to Harwich Haven Authority. Unicomarine report, Str_pl-Jan00; Dyer, M.F. and Worsfold, T.M. 2001. Stour estuary. Benthic survey of sediment placement sites. Results of pre and post placement benthic sampling in 1998, 1999 and 2000. Report to Harwich Haven Authority. Unicomarine report, StrPl98990 Dan Lear Data Archive for Seabed Species and Habitats (DASSH) 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk distributor dataset Trial placements of dredged fine sediment were undertaken, during the winter of 1998-1999 and 1999-2000, at several sites in the Stour estuary. Unicomarine Ltd carried out three macrobenthos surveys to assess the impact of sediment replenishment on fauna. Three 0.04m2 Shipek grab samples were taken at each station, two for benthic analysis and one for partical size analysis. Biological samples were sieved through a 0.5mm sieve. The first survey was carried out in October 1998. Stations were sampled round the placement site with additional reference stations further away from the placement site (39 stations in total). The survey was repeated in April 1999, after placement of sediment over the winter of 1998-1999, and again in May 2000 after a second placement of sediment. During the 2000 survey 43 stations were sampled including three additional reference stations towards the banks. In 1999 there was an increase in coarse material, compared with 1998, and some species associated with stones were more common. In 2000 the sediment data indicated that production of coarse sediment was similar to 1998 but the amount of silt/clay material had increased slightly, as would be expected from the fine sediments deposited in the area. The dominant community groups, biotopes and taxa found were simmilar for all surveys and there was little change in total numbers of taxa and individuals between years. Two major community groups were discernible in all years. Minor changes in community structure could be traced from year to year and related to fluctuating populations of dominant taxa. The reasons for the small changes could not be confidently identified. Some were clearly the result of changes in the sediment regime but it is not clear whether those changes may have been a result of sediment placement or of natural fluctuations.