Alternate title

2015 Harbour Porpoise Roaringwater Bay Is SAC

Date (Publication)

2022-05-31

Citation identifier

https://data.gov.ie/dataset/ / Harbour porpoise surveys in Roaringwater Bay and Islands SAC, 2015

Purpose

A visual survey of harbour porpoises (Phocoena phocoena) was carried out in 2015 in the Roaringwater Bay and Islands SAC in order to derive local density and abundance estimates. Single platform line-transect surveys were carried out according to a standardised design across six days between June and September 2015. Static Acoustic Monitoring (SAM) through the deployment of C-PODs was carried out at two sites within the SAC using a randomised sampling design. Distance sampling was used to produce a detection function based on the observed distribution of harbour porpoise sightings. Abundance estimates were calculated using the day as the sample and the sighting as the observation for:

(i) for all survey days

(ii) stratified by sea state and

(iii) for all surveys combined

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Department of Housing, Local Government and Heritage	National Parks and Wildlife Service	datadelivery@housing.gov.ie	Point of contact

Maintenance and update frequency

As needed

GEMET - INSPIRE themes, version 1.0

• Species distribution

GEMET - Concepts, version 4.2.3

• biota, biodiversity, marine fauna, cetacean

National Parks and Wildlife Service

• National Parks and Wildlife Service, NPWS, marine, mammal, biodiversity

ISO 3166

• Ireland

Use limitation

http://creativecommons.org/licenses/by/4.0/

Use limitation

http://creativecommons.org/licenses/by/4.0/

Access constraints

Other restrictions

Other constraints

Copyright Government of Ireland. This dataset was created by National Parks and Wildlife Service, Department of Housing, Local Government and Heritage. This copyright material is licensed for re-use under the Creative Commons Attribution 4.0 International licence. http://creativecommons.org/licenses/by/4.0/

Spatial representation type

Vector

Denominator

50000

Language

English

Character set

UTF8

Topic category

• Environment

Begin date

2015-06-06

End date

2015-11-06

Reference system identifier

https://www.opengis.net/def/crs/EPSG/0/4326 / 4326

EPSG Geodetic Parameter Dataset EPSG 2009-11-25

Distribution format

Name	Version
Esri shapefile	v10+

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Department of Housing, Local Government and Heritage	National Parks and Wildlife Service	datadelivery@housing.gov.ie.ie	Point of contact

OnLine resource

Protocol	Linkage	Name
zip	https://www.npws.ie/sites/default/files/general/HPRB15.zip	Dataset

Hierarchy level

Dataset

Statement

During each transect the position of the survey vessel was tracked continuously through a GPS receiver connected to a laptop computer, while survey effort including environmental conditions (sea-state, wind strength and direction, glare, etc.) were recorded every 15 minutes using LOGGER software (IFAW). When a sighting was made the position of the vessel was recorded immediately and the angle of the sighting from the track of the vessel and the estimated radial distance of the sighted animal(s) from the vessel were recorded. These data were communicated to the recorder in the wheelhouse via VHF radio. The angle was recorded to the nearest degree using an angle board attached to the vessel immediately in front of each observer. Accurate distance estimation is essential for distance sampling. Measuring sticks (Heinemann, 1981) were made by each primary observer to assist in distance estimation.

Some data was modified to comply with GDPR legislation and open data publication guidelines.

Metadata

File identifier

c32149e5-e9cb-4c92-8f3d-7daea82c37e7 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2023-11-20T16:32:14

Metadata standard name

ISDI Metadata Profile

Metadata standard version

1.2

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Department of Housing, Local Government and Heritage	National Parks and Wildlife Service	datadelivery@housing.gov.ie	Author