Species point records from 1973 University of Bristol Severn estuary littoral survey

Published by:
Joint Nature Conservation Committee
Last updated:
04 February 2016
Topic:
Environment
Licence:
Open Government Licence

Summary

The pattern of the infauna on particulate shores of the southern coasts of the Severn Estuary has been examined. Although mud predominates as the major beach substratum within the Estuary, sand beaches occur in both the lower and the upper reaches. Liquid mud is found at l.w. in the middle reaches. Suitability of substratum is shown to be the most important factor influencing animal distribution. The number of infaunal species found in this survey did not increase markedly towards the mouth, in contrast to the pattern displayed by rocky shore animals. Several species were rare or absent on mud beaches close to the entrance of the River Avon and the possibility that sewage contamination is responsible for this is discussed. The methods of sampling differed slightly at different transect sites. Normally one quadrat of area 0.25m2 was taken at each station and sieved through a mesh of 0.5mm. When the substratum was very firm mud or clay with a surface coating of softer mud which was less than 10cm deep, this surface layer only was taken, since it was impossible to force the clay through the sieve. Such samples were supplemented with 10cm deep cores of area 0.01m2. No distinction was made in the reprint of which stations had which method of sampling on them so both methods have been recorded at each station.

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1973-University-of-Bristol-Severn-estuary-littoral-survey.csv CSV 04 February 2016 Preview

Additional information

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Added to data.gov.uk
2018-05-17
Access contraints
no limitations
Harvest GUID
1a99da49-2345-453a-8dd7-caa093798cf4
Extent
Latitude: 51.7980328° to 51.16823983°
Longitude: -3.450276104° to -2.349424591°
Spatial reference system
Dataset reference date
2001-08-21 (publication)
Frequency of update
Responsible party
Digital and Data Solutions, JNCC (custodian)
ISO 19139 resource type
dataset
Metadata language
eng
Source Metadata
XML
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