6d617269-6e65-696e-666f-000000002823 UTF-8 Scottish Association for Marine Science info@sams.ac.uk 2026-01-26T00:00:00+01:00 EPSG:4326 Marine Awareness North Wales, Wildlife Trust harbor porpoise baseline surveys on the north coast of Anlesey, Wales, UK 2011-05-27 Publication 6d617269-6e65-696e-666f-000000002823 Data collected from 2002 to 2004 on harbor porpoise populations at the north coast of Anglesey, Wales, United Kingdom. A three year study was undertaken during 2002 to 2004 from May to September to estimate abundance and density of harbor porpoises on the north coast of Anglesey, Wales, United Kingdom. There were no ecological data regarding the harbor porpoises in Anglesey waters so the ability to influence conservation measures was highly constrained. Boat-based transects using distance sampling techniques were applied so a robust estimate of density and abundance could be attained. The study area consisted of a block approximately 489 km2 extending from the east of Point Lynas to the west of South Stack on north coast of Anglesey. The study area was divided into five blocks consisting of 31 perpendicular transect lines to the shore. Each of the transect lines were surveyed 1–5 times by the end of the three year study. Based on the assumption that g(0) = 1 the density of harbor porpoises for the 489 km2 study site was estimated to be 0.630 individuals/km2 (CV = 0.20) and the abundance is estimated to be 309 individuals (CV = 0.20). Heterogeneity in density and abundance was observed across the five blocks which showed Point Lynas and South Stack to have the highest densities. This distribution was closely associated to fine-scale oceanographic features which cause prey to be concentrated and may facilitate foraging for harbor porpoises. The study showed that Anglesey provides coastal habitats for the harbor porpoise and was the first study of this kind in North Wales, United Kingdom. The need for abundance and density estimates was highlighted as a key factor in the conservation and management of the harbor porpoise in Anglesey waters. Moreover, proposed extension of the wind farms from Liverpool Bay to Anglesey and the potential of the area for marine renewable energy devices presented a problem to managers and planners due to the lack of knowledge of harbor porpoise populations in north Wales. Scottish Association for Marine Science info@sams.ac.uk Scottish Association for Marine Science info@sams.ac.uk Bio-geographical regions Habitats and biotopes Sea regions GEMET - INSPIRE themes, version 1.0 2008-06-01 Publication Attribution-NonCommercial (CC BY-NC) There are no limitations on public access to spatial data sets and services. Tabular English biota environment geoscientificInformation oceans -4.8338 -4.1973 53.2555 53.5026 2002-01-01 2004-01-01 2002-07-07 2004-09-09 XYZ ASCII online information about the resource online instructions for transferring data from one storage device or system to another online information about the resource online instructions for transferring data from one storage device or system to another online instructions for transferring data from one storage device or system to another OGC Web Feature Service Download Service INSPIRE Download Service (WFS) OGC Web Map Service View Service INSPIRE WMS online instructions for transferring data from one storage device or system to another online instructions for transferring data from one storage device or system to another online instructions for transferring data from one storage device or system to another Technical Guidance for the implementation of INSPIRE dataset and service metadata based on ISO/TS 19139:2007 2017-03-02 Publication This metadata set is non conformant with the Technical Guidance for the implementation of INSPIRE dataset and service metadata based on ISO/TS 19139:2007 false 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 2010-12-08 Publication Conformance of this data set with the INSPIRE Implementing Rules for the interoperability of spatial data sets and services was not evaluated Prior to publication data undergo quality control checked which are described in https://github.com/EMODnet/EMODnetBiocheck?tab=readme-ov-file#understanding-the-output