7b55e86c-4f3d-4f27-a2b6-4f232dd6de11 eng dataset Digital and Data Solutions, JNCC data@jncc.gov.uk pointOfContact 2018-05-17 Species point records from 1973-75 University of Bristol Severn estuary littoral sediment survey 1999-07-26 1999-07-26 7b55e86c-4f3d-4f27-a2b6-4f232dd6de11 Variations in invertebrate densities within the Severn Estuary have been examined on four shores over a period of two years. Variability due to seasonal changes was combined with a patchy distribution of some species, while others showed consistent densities at the same tidal level and at different sampling times. Some species showed more consistent densities in winter than in summer. Biological interactions, varying periods of spawning and recruitment and beach instability are thought to be three of the major factors influencing distribution. No marked community changes such as seen in some sublittoral areas have been found. Digital and Data Solutions, JNCC data@jncc.gov.uk custodian Marine Marine Recorder JNCCMNCR10000488 MNCR Species Open Government Licence v3.0 otherRestrictions no limitations eng oceans -3.475731183 -2.464773722 51.20389245 51.73379479 1973-01-01 1975-11-30 Little, Boyden (1976) Variations in the fauna of particulate shores of the Severn estuary Comma Separated Values Unknown http://data.jncc.gov.uk/data/7b55e86c-4f3d-4f27-a2b6-4f232dd6de11-1973-75-University-of-Bristol-Severn-estuary-littoral-sediment-survey.csv 1973-75-University-of-Bristol-Severn-estuary-littoral-sediment-survey.csv This survey was extracted from a Marine Recorder snapshot.