Dataset Details - Purse Search Shark and Ray Eggcase Sightings Scheme Data, 2007-2018
Distribution of shark and ray eggcases around Ireland's coasts, including citizen scientist observations of discarded eggcases washed up on beaches, as well as some sightings of live eggs underwater. Includes 2 species of shark and 10 species of skate or egglaying ray.
14/03/2022
09/10/2024
To use public participation as a tool for investigating egglaying elasmobranch nursery areas in Ireland.
Observations by citizen scientists were gathered through an online sightings form, with provision of either a photograph or eggcase sample required for species verification. Identification of species was carried out by marine biologists in Marine Dimensions with expertise and experience in the identification of elasmobranch eggcases. Sighting location coordinates were determined according to the information provided by observers in sighting reports and through follow up with our team. In cases where precise coordinates were not provided by the observer, Google Earth was used to determine lat longs for location names. The degree of confidence in the location accuracy was also assessed through the Confidence in Location attribute.
Republic of Ireland
2007-2018
We have a high level of confidence in the dataset due to the strict verifiation process outlined above. The dataset has also been groomed in order to ensure high accurarcy and reliability.
Complete
N/A
Restricted (Data can be viewed on the mapping system but is not available for download)
Marine Dimensions, Purse Search Shark and Ray Eggcase Sightings Scheme Data, 2007-2018, National Biodiversity Data Centre, Ireland, accessed 11 May 2025, <https://maps.biodiversityireland.ie/Dataset/337>
Dataset species distribution
Terrestrial Map - 10km
Terrestrial Map - 10km
Distribution of the number of species recorded within each 10km grid square (ITM).Marine Map - 50Km
Marine Map - 50Km
Distribution of the number of species recorded within each 50km grid square (WGS84).Dataset record distribution
Terrestrial Map - 10km
Terrestrial Map - 10km
Distribution of the number of records within each 10km grid square (ITM).Marine Map - 50Km
Marine Map - 50Km
Distribution of the number of records within each 50km grid square (WGS84).Dataset Contacts
Bríd O'Connor
N/A
01 2828876
Records per year
Species per year
Date Statistics
| Resolution | No. records |
|---|---|
| Day | 1031 |
| Day Range | 1 |
| Month | 1 |
| Unknown | 1 |
1900
2018
Record Statistics
1034
381
12
0
| Resolution | No. records |
|---|---|
| 100m | 974 |
| 1km | 0 |
| 2km | 0 |
| 10km | 60 |
| 50km | 0 |
Dataset Attributes
| Attribute | Description |
|---|---|
| Confidence in Location | Rated as high, medium or low, depending on accuracy and scale of information provided by the observer. |
| County | Name of administrative county within which the record was made |
| Number of Purses | Abundance of purses recorded |
Recorded Species
| TaxonId | PrefnameTaxonId | Name | Authority | Group | Rank | Records |
|---|---|---|---|---|---|---|
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