Identification

Title

Habitat point records from 1984 Bishop Scilly Isles Echinus population study

Abstract

Echinus esculentus is the subject of a small scale commercial fishery in the Isles of Scilly. Collection is by diving during the winter months, and during 1983/84 it is estimated that a total of 71,000 to 83,000 individuals were taken from three shallow sublittoral areas. This report presents the results of a survey of selected E esculentus populations in the Isles of Scilly during September 1984. 7 areas were sampled, 3 of which are categorised as fished, and 4 as unfished. Within these 7 sampling areas, 28 dives were made and locations recorded with a sighting compass. The mean site density of urchins ranged from 0.09/m2 to 0.56/m2, with an overall mean of 0.36/m2. There was no difference in density between fished and unfished sites. Individual diameters of E. esculentus ranged from 61 mm to 143 mm with an overall site mean of 103.98 mm. No recruitment of juveniles was noted, and all populations examined are senescent. Density and size structure of the populations of E. esculentus examined in the Isles of Scilly compare closely to results from other locations in south-west Britain. This does not necessarily suggest that there are no noticeable effects of fishing on the Scilly urchin populations, since many of these other locations have experienced collecting in the recent past. However at present there is no evidence of differing population characteristics in Scilly when comparing fished and unfished areas.

Resource type

dataset

Resource locator

http://data.jncc.gov.uk/data/27d4cbf9-9a8c-441e-901e-ae03d40299ab-1984-Bishop-Scilly-Isles-Echinus-population-study.csv

name: 1984-Bishop-Scilly-Isles-Echinus-population-study.csv

Unique resource identifier

code

27d4cbf9-9a8c-441e-901e-ae03d40299ab

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Additional information source

Bishop (1985) Study of $Echinus esculentus$ populations in the Isles of Scilly, October 1984.

Classification of spatial data and services

Topic category

oceans

Keywords

Keyword set

keyword value

Marine

Marine Recorder

JNCCMNCR10000153

Habitat

MNCR

Geographic location

West bounding longitude

-6.454165042

East bounding longitude

-6.243212793

North bounding latitude

49.9934675

South bounding latitude

49.85956635

Temporal reference

Temporal extent

Begin position

1984-09-01

End position

1984-09-30

Dataset reference date

date type

publication

effective date

2000-01-06

Frequency of update

Quality and validity

Lineage

This survey was extracted from a Marine Recorder snapshot.

Conformity

Data format

name of format

Comma Separated Values

version of format

Unknown

Constraints related to access and use

Constraint set

Use constraints

Open Government Licence v3.0

Limitations on public access

no limitations

Responsible organisations

Responsible party

organisation name

Digital and Data Solutions, JNCC

email address

data@jncc.gov.uk

responsible party role

custodian

Metadata on metadata

Metadata point of contact

organisation name

Digital and Data Solutions, JNCC

email address

data@jncc.gov.uk

responsible party role

pointOfContact

Metadata date

2018-05-17

Metadata language

eng