Volunteer Diver Seagrass Zostera marina Surveys Porth Dinllaen (2009)
Seagrass is the only marine flowering plant found subtidally in the UK and seagrass beds are considered of National importance. In 2009 Zostera marina was the focus of former Countryside Council for Wales (CCW), now part of Natural Resources Wales (NRW), volunteer dive surveys at Porth Dinllaen in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) to estimate the extent of the bed. The survey is a continuation of a 2008 pilot, and is due to be re-surveyed before 2012 to start to build up a picture of variation in the extent of the seagrass bed at the site. The main objectives of this project were to: 1. Test methods to measure extent of large seagrass beds using volunteers 2. Estimate density and measure depth of live seagrass in different parts of the bed 3. Make note of any unusual features of the seagrass bed 4. Compare with results and success of 2008 surveys
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS111487
- Teitl Amgen
-
- 2009 CCW Porth Dinllaen Seagrass Survey MRMES00200000011
- Seagrass surveys in Porth Dinllaen
- Arolygon gan ddeifars gwirfoddol ar wellt y gamlas Zostera marina, Pen Llyn ac Aberdaugleddau 2009
- Laith Metadata
- English
- Datganiad
-
Data is captured by using volunteer divers who are CMAS 2 star qualified or equivalent with a minimum of 60 dives each. Volunteers estimated the extent of large seagrass beds using rapid unmarked transects analysis, using a GPS surface tracking buoy, noting the time and depth of features of the seagrass bed (eg: where the bed starts or stops, or the position of 'mooring scars'). This method was compared with the success when some divers swam towards a fixed underwater acoustic marker (transponder) with a homing device, noting the distance and bearing to the transponder to note the key features. Wherever possible, quadrats were taken at stations along transects and the presence of flowering, seeding and wasting were noted, together with any associated, potentially threatening or BAP species. Survey methods and success were compared to the 2008 survey methods and results, and the technique's feasibility for future volunteer surveys discussed.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2009-12-31
Ystod amser
- Dyddiad cychwyn
- 2009-06-14
- Dyddiad gorffen
- 2009-07-05
- Categori pwnc
-
- Biota
Rhychwant
Rhychwant
- Hyd
- GWYNEDD - GWYNEDD
))
Maint Fertigol
- Maint allweddair MEDIN
-
benthic boundary layer
Maint Fertigol
- Gwerth lleiaf
- 0
- Gwerth uchaf
- -6.5
- System Gyfeirio Cydlynu Fertigol
Dosbarthiad
- Fformat - Math a Disgrifiad
-
-
Database
Database
()
- Math
-
[A] Transects and density data are MapInfo TAB files. [B] Species data held in excel spreadsheets. [C] Seasearch data held in Marine Recorder. [D] Images as JPGs [E] Summary report as word file.
-
Database
Database
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
Data is captured by using volunteer divers who are CMAS 2 star qualified or equivalent with a minimum of 60 dives each. Volunteers estimated the extent of large seagrass beds using rapid unmarked transects analysis, using a GPS surface tracking buoy, noting the time and depth of features of the seagrass bed (eg: where the bed starts or stops, or the position of 'mooring scars'). This method was compared with the success when some divers swam towards a fixed underwater acoustic marker (transponder) with a homing device, noting the distance and bearing to the transponder to note the key features. Wherever possible, quadrats were taken at stations along transects and the presence of flowering, seeding and wasting were noted, together with any associated, potentially threatening or BAP species. Survey methods and success were compared to the 2008 survey methods and results, and the technique's feasibility for future volunteer surveys discussed.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
-
- zostera marina
- eelgrass
- seagrasses (see also potamogetonaceae and hydrocharitaceae)
- zostera
- posidoniaceae
- Porth Dinllaen
- Pen Llyn a'r Sarnau cSAC
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
-
- Macroalgae and seagrass taxonomy-related counts
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
Allweddair
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
-
The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. NRW may release, publish or disseminate this data freely; providing recipients are made aware of use restrictions (See general use restrictions).
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
-
© CNC/NRW and © Crown copyright 2009. All rights reserved. Natural Resources Wales, AC0000849444 Third parties seeking to re-use this data require a Licence issued by NRW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.
Metadata
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313131343837 XML
- Laith Metadata
- English
- Dynodydd Rhiant
-
Across Wales Diving Monitoring Project (2004)
NRW_DS109743
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-05-31T09:22:53.063Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0