1649a3fb-9648-4485-827a-0245353a2ac7 eng dataset Digital and Data Solutions, JNCC data@jncc.gov.uk pointOfContact 2018-05-17 Species point records from 1990 NRA Essex/Suffolk estuaries littoral survey 2001-08-29 2001-08-29 1649a3fb-9648-4485-827a-0245353a2ac7 Intertidal, benthic samples were taken at 67 sites on the estuaries of Essex and Suffolk in the autumn 1990, as part of the NRA's 1990 National Estuaries Survey. Most sites had typically estuarine fauna, with the exception of the seaward end of the Deben estuary which had low species diversity and abundance, which is thought to be related to the low levels of organic carbon in the sediments of the area. The upper estuaries all had large populations of oligocheates. However, the total number of species found at the upper estuarine sites was about average for the area as a whole. Some species, notably Hediste and the bivalves, were represented by large specimens so that the relative biomass of oligochaetes was low. The conclusion reached was that although the organic load in the areas studied may be high, it is unlikely that there are any gross pollution effects. A 10cm corer was used to sample to a depth of 15cm at each site. Three replicates were taken at each site and sieved through a 500 æm sieve. A sediment core of 44mm diam and 15cm deep was used to take samples from each site, but only those from the Suffolk estuaries were analysed for particle size, and organic carbon content. Digital and Data Solutions, JNCC data@jncc.gov.uk custodian Marine Marine Recorder JNCCMNCR10000346 MNCR Species Open Government Licence v3.0 otherRestrictions no limitations eng oceans 0.591391011 1.712823796 51.49029573 52.34169171 1990-07-09 1990-11-23 Dyer, Grist, Smith (1991) Essex/Suffolk estuaries intertidal survey - 1990 Smith (1982) The $Spartina$ communities of the Cromarty Firth Comma Separated Values Unknown http://data.jncc.gov.uk/data/1649a3fb-9648-4485-827a-0245353a2ac7-1990-NRA-Essex-Suffolk-estuaries-littoral-survey.csv 1990-NRA-Essex-Suffolk-estuaries-littoral-survey.csv This survey was extracted from a Marine Recorder snapshot.