Dull adnabod

Dynodydd

NRW_DS112290

Teitl Amgen

• 2008 CCW / ASML Menai Strait and Conwy Bay SAC Foryd Bay survey (MRCCW16300000019)

Laith Metadata

English

Datganiad

The Grid Maker tool in the MapInfo GIS package was used to create a grid of 47 stations across the defined survey area, with a north-south distance of 200 m between points and an east-west distance of 330 m. This gave the most appropriate coverage of the flats to enable sampling of the range of biotopes on the Phase 1 map with the manpower available. On site, each survey pair was allocated a section of the grid to survey and GPS units were used to navigate to each station in turn. Where possible, a single 0.01 m2 core sample was taken at each survey station. If the station happened to lie on a rocky outcrop, in a drainage channel or in a pool greater than ~5 cm deep, then a core sample was not taken. The core sample was sieved using a 0.5 mm mesh sieve in a nearby pool. The contents of the sieve were then inspected closely, with the aid of a magnifying glass. All visible animals were identified and counted, to the extent achievable, by the most experienced surveyor in the pair. Phase 1 surveys of intertidal habitats in the SAC were carried out in the SAC between 1999 and 2003 (Brazier et al. 2007), providing detailed mapping of the intertidal biotopes with some information on characterizing species. Considerable historical data exists on the intertidal habitats and communities present at many sites in the SAC, including Y Foryd, Traeth Lafan and the tide-swept boulder shores of the Menai Strait. Methodological trials and surveys, designed for the purposes of SAC monitoring, have been carried out in recent years. Of particular relevance to this report are the surveys of tide-swept boulder biotopes at sites on the Menai Strait (Boyes and Allen 2004, Mazik et al. 2005) and a report of boulder monitoring stations established by ASML/CCW in 2007 (Moore 2008), and a survey of the Zostera noltii bed in Y Foryd (Boyes, Proctor and Mitchell 2004). All survey completed by professional and experienced marine field surveyors. Data quality and confidence considered high.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

2010-06-30

Rhychwant

Rhychwant

Hyd

SIR YNYS MON - ISLE OF ANGLESEY

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W

E

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Dosbarthiad

Ansawdd

Allweddeiriau

System Cyfeirio Gofodol

Cynnwys

Cyfyngiadau