Irish Spatial Data Exchange
Harbour porpoise surveys in Rocakbill to Dalkey Island SAC, 2016
A visual survey of harbour porpoises (Phocoena phocoena) was carried out in the summer of 2016 within the Rockabill to Dalkey Island SAC, Co Dublin in order to derive local density and abundance estimates. Single platform line-transect surveys were carried out according to a standardised design on four days between June and September 2016. Surveys were conducted between the 7th June and 15th September 2016. 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:
(i) for all survey days,
(ii) stratified by sea state and
(iii) for all surveys combined
Surveys were carried out in favourable weather conditions (i.e., sea-state ≤2, with visibility of at least 6km) on all four survey days. A combined total of 506km of track-line was surveyed, which resulted in 152 distinct sightings totalling at least 246 individual harbour porpoises. The observed proportion of young porpoises (juveniles and calves combined) to adults was 9.8% and the proportion of calves to adults was 5.7%. No other cetacean species was recorded on any of the surveys, but a number of grey and harbour seals were sighted during on-effort periods.
Simple
- Alternate title
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2016 Harbour Porpoise survey Rockabill Dalkey Is
- Date (Publication)
- 2022-07-07
- Citation identifier
- https://data.gov.ie/dataset/ / Harbour porpoise surveys in Rocakbill to Dalkey Island SAC, 2016
- Purpose
-
A visual survey of harbour porpoises (Phocoena phocoena) was carried out in the summer of 2016 within the Rockabill to Dalkey Island SAC, Co Dublin in order to derive local density and abundance estimates. Single platform line-transect surveys were carried out according to a standardised design on four days between June and September 2016. 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:
(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
Point of contact
- Maintenance and update frequency
- As needed
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GEMET - INSPIRE themes, version 1.0
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Species distribution
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GEMET - Concepts, version 4.2.3
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biota, biodiversity, marine fauna, cetacean
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-
National Parks and Wildlife Service
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National Parks and Wildlife Service, NPWS, marine, mammal, biodiversity
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ISO 3166
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Ireland
-
- Use limitation
- Use limitation
- Access constraints
- Other restrictions
- Other constraints
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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
- 2016-06-07
- End date
- 2016-09-15
Vertical extent
- Minimum value
- 0
- Maximum value
- 1014
Vertical CS
Vertical datum
- 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
Point of contact
- OnLine resource
-
Protocol Linkage Name zip
https://www.npws.ie/sites/default/files/general/RDPS16.zip Dataset
- Hierarchy level
- Dataset
Conformance result
- Title
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INSPIRE Data Specification on Provide Spatial Data Theme keyword
- Alternate title
-
INSPIRE Data Specifications v3.0
- Date (Publication)
- 2011-06-15
- Explanation
-
The INSPIRE Directive or INSPIRE lays down a general framework for a Spatial Data Infrastructure (SDI) for the purposes of European Community environmental policies and policies or activities which may have an impact on the environment.
- Pass
- No
Conformance result
- Title
-
COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Alternate title
-
INSPIRE Interoperability Regulation
- Date (Publication)
- 2010-12-08
- Explanation
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Level of conformance with the COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Pass
- No
- 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).
Metadata
- File identifier
- 08afc5ee-5fe6-448e-bb94-e58f7b4dc73f XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2023-11-20T18:03:56
- 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
Author
)))
