Identification

Dynodydd

Identifier

NRW_DS115332

Teitl Amgen

Alternative Title

• Monitro Rhynglanwol ar riffiau Sabellaria alveolata yn ACA Pen Llyn a'r Sarnau yn 2012

Laith Metadata

Metadata Language

English

Lineage

The Llandanwg and West Afon Dwyfor Sabellaria reef transects were re-surveyed in 2012, having been surveyed by ASML in 2009 and 2010. Existing 2010 maps of Sabellaria reef in these areas were used to orientate the work area in 2012. At both Llandanwg and West Afon Dwyfor the survey task was to re-survey the areas surveyed by quadrat in 2009 and 2010. The Sabellaria reef in the vicinity of the quadrat sites was also mapped from the upper limit of Sabellaria on the shore, to the lower limit of access on the shore, as dictated by the height of the low tide. The mapped areas were not as large as the 2010 areas, as the tides were not as workable in 2012. On the shore, the GPS units were used by the survey teams to navigate to the correct, central position for each quadratting area within the 'quadrat zone' described in 2009, within the Sabellaria reef. At each quadrat station, surveyors established an origin at the centre of an imaginary 20 m x 20 m grid (numbers vs letters) i.e. at location 10 'm' (= x,y) and then the surveyors proceeded to survey the initial 5 random quadrats in detail. Estimates were made of the percentage cover of standing water, total Sabellaria, live Sabellaria and a small selection of key species/taxa. Other typical fauna and flora (listed on the proforma) were then searched for and recorded. No estimation of abundance was required for these species (to speed up the recording), but rapid estimates of algal cover and other major cover organisms such as Mytilus edulis were made.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

Dataset Reference Date (Publication)

2012-07-31

Extent

Extent

Hyd

Geographic Extent

Wales (WLS)

N

W

E

S

 

Distribution

Quality

Keywords

Spatial Reference System

Content

Constraints