5e41bf62-f51e-4e5e-b2af-e3816f172ea2 eng dataset Digital and Data Solutions, JNCC data@jncc.gov.uk pointOfContact 2018-05-17 Species point records from 1978 UCNW Glaslyn/Dwyryd estuary littoral sediment survey 2001-08-29 2001-08-29 5e41bf62-f51e-4e5e-b2af-e3816f172ea2 Benthic survey of Glaswyn/Dwyryd Estuary sandflats, adjacent to Morfa Harlech NNR. The estuary is extensive at 8.2 km. Sediments are of marine sand collected by Langshore drift in Coreligan Bay, and accretion in the estuarine area. Two obvious faunal trends ar apparent when the main part of the estuary. A salinity trend restricting Anguilla tenuis and Bathyporeia pelagica to low ground near the mouth and a sand/mobility/shelter/height based trend from the sparse fauna of the sandy low water channels to the organically richer muddy salt marsh fringe. The basin just above Portmadoc town bridge is an especially muddy artificial habitat sheltered by embankments and adjacent to the town sewage works. This mud seems to hold Nereis diversicolor, Prionospio cirifera and oligochaetes. Digital and Data Solutions, JNCC data@jncc.gov.uk custodian Marine Marine Recorder JNCCMNCR10000633 MNCR Species Open Government Licence v3.0 otherRestrictions no limitations eng oceans -4.174349091 -3.993369947 52.89568172 52.94650926 1978-07-01 1978-07-01 Cook, Rees (1978) Survey of macroinvertebrate populations in the Glaslyn/Dwyryd estuary. Comma Separated Values Unknown http://data.jncc.gov.uk/data/5e41bf62-f51e-4e5e-b2af-e3816f172ea2-1978-UCNW-Glaslyn-Dwyryd-estuary-littoral-sediment-survey.csv 1978-UCNW-Glaslyn-Dwyryd-estuary-littoral-sediment-survey.csv This survey was extracted from a Marine Recorder snapshot.