Identification

Title

Species point records from 1986 Bishop Scilly Isles Echinus population study

Abstract

Echinus esculentus, normally the subject of a small scale commercial fishery in the Isles of Scilly during the winter months, was not collected during the winter of 1985/86. This report presents the results of the third survey of selected Echinus esculentus populations in the Isles of Scilly, which took place during September 1986. These are compared with data from the same sites obtained during September 1984 and 1985. Seven areas were sampled, four of which are classified as unfished and three as fished sites. Within each of the seven areas, sampling sites were located as closely as possible to those studied in the 1985 survey. The mean density of urchins ranges from 0.05/m2 to 0.49/m2. Within the precision of the methodology, these figures compare exactly to the range measured in 1985 (0.05/m2 to 0.40/m2). There is no significant difference in the density of urchins between fished and unfished sites. The mean diameter of E. esculentus ranged from 95 mm to 122 mm with an overall site mean of 105+2 mm (n = 12). This compares with a slightly lower and smaller range of 92 mm to 112 mm during 1985, but a similar overall site mean of 104+2 mm (n = 10). The mean diameter of urchins at unfished sites was smaller than that of fished sites (98+1, n = 4 and 107.6+2, n = 8 respectively), which was also true in both 1984 and 1985. No major physical changes have affected the sites since 1984, and the dominant fauna and flora appear to be unchanged. There is still no evidence of juvenile or young adult individuals (size <5 cm diameter) at the monitoring sites, although it is believed that juveniles are present at deeper sites which cannot be dived or remotely sampled within the remit of the present contract.

Resource type

dataset

Resource locator

http://data.jncc.gov.uk/data/4ca1139c-1713-42af-9c40-f985d37136fd-1986-Bishop-Scilly-Isles-Echinus-population-study.csv

name: 1986-Bishop-Scilly-Isles-Echinus-population-study.csv

Unique resource identifier

code

4ca1139c-1713-42af-9c40-f985d37136fd

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Additional information source

Bishop (1986) Study of $Echinus esculentus$ L. populations in the Isles of Scilly, September 1986.

Classification of spatial data and services

Topic category

oceans

Keywords

Keyword set

keyword value

Marine

Marine Recorder

JNCCMNCR10000155

MNCR

Species

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

1986-09-01

End position

1986-09-30

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