A visual and Passive Acoustic Monitoring (PAM) survey of harbour porpoises (Phocoena phocoena) was carried out in 2013 at two Special Areas of Conservation (Rockabill to Dalkey Island SAC, Co Dublin and Roaringwater Bay and Islands SAC, Co Cork) in order to derive local density and abundance estimates. Single platform line-transect surveys were carried out according to a standardised design on six days at each site between July and October 2013, and a towed hydrophone array was deployed during all surveys to collect ancillary passive acoustic data. 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 with sufficient sightings and (ii) for each site overall using pooled survey effort and sightings information
L o a d i n g
Overviewbiodiversitybiotacetaceanenvironmentirelandmammalmarinemarine faunanational parks and wildlife servicenpwsspecies distribution
Additional Information
KeyValue
Conforms To["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.", "http://www.opengis.net/def/crs/EPSG/0/4326"]
Contact Emaildatadelivery@housing.gov.ie
Contact NameDepartment of Housing, Local Government and Heritage
FrequencyOther
Guidhttps://data.gov.ie/dataset/1de26581-c01c-4201-a120-27fd739a2924
Harvest Object Id6562bb2b-47c4-41d7-bd7d-8eecf5dcc10f
Harvest Source Id01350574-268d-4abb-b9b4-8108224932c4
Harvest Source Titledata.gov.ie - Environment
Identifier1de26581-c01c-4201-a120-27fd739a2924
Issued2022-07-06
Language["http://publications.europa.eu/resource/authority/language/ENG"]
Modified2026-06-03T02:23:00
ProvenanceDuring 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 on each vessel by each primary observer to assist in distance estimation.
Some data was modified to comply with GDPR legislation and open data publication guidelines. The shapefile HPRR13_RWB_Survey_1.shp was created from data collected on 10th July 2013.
Publisher NameDepartment of Housing, Local Government and Heritage
Publisher Urihttps://data.gov.ie/organization/department-of-housing-planning-community-and-local-government
Spatial{"type":"Polygon","coordinates":[[[-10.650444030762, 50.807923689449],[-10.650444030762, 55.993470564449], [-5.289115905762, 55.993470564449], [-5.289115905762, 50.807923689449], [-10.650444030762, 50.807923689449]]]}
Theme["http://publications.europa.eu/resource/authority/data-theme/ENVI", "Environment"]
Urihttps://data.gov.ie/dataset/1de26581-c01c-4201-a120-27fd739a2924