Grey Seal Halichoerus grypus Phenology at Skomer and Marloes Peninsula

The grey seal (Halichoerus grypus) is listed in Annex II of the EU Habitats Directive and is a qualifying feature of three Special Areas of Conservation in Wales. Pembrokeshire colonies represent the largest breeding population in southwest Britain. The aim of this study was to provide evidence on the status of grey seal pup numbers around the Island of Skomer and the Marloes Peninsula, Pembrokeshire, based on over 30 years of survey data collected from 1983-2015. This report quantifies recent population growth, analyses the timing of the pupping season and makes recommendations for the future of this survey. Logistical constraints at the end of the observing season required data modelling to estimate both the mid-point and length of the pupping season.

Dull adnabod

Dynodydd
NRW_DS119129
Teitl Amgen
  • Ffenoleg Morloi Llwyd Halichoerus grypus yn Sgomer a Phenrhyn Marloes
  • Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Marloes Peninsula, Wales
  • Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Skomer, Wales
Laith Metadata
English
Datganiad

Trained staff have conducted over 30 annual surveys from 1983-2015 of grey seal pupping sites. Individual records were kept of each pup’s progress from birth to moult following a standardized protocol. Details included a unique numerical pup identifier, the location (beach name) and date of first observation, and a qualitative assessment of the developmental stage (1-5) of the pup. Sites were visited once a week and pups marked with a unique pattern to help monitor each individual. Records were maintained in field note books and transferred to recording sheets and Excel spread-sheets. Annual reports have been produced, from which the data in this study have been collated. Using R, spatially aggregated counts of pup numbers were analysed and trends in population abundances were quantified by fitting a Generalised Additive Model to the time series of annual pup counts.
Gwybodaeth ychwanegol

Skomer seal report: Bull JC, Börger L, Franconi N, Banga R, Lock KM, Morris CW, Newman PB, Stringell TB. (2017), Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Skomer, Wales, NRW Evidence Report No: 217, 23pp, Natural Resources Wales, Bangor. Marloes seal report: Bull JC, Börger L, Banga R, Franconi N, Lock KM, Morris CW, Newman PB, Stringell TB. (2016), Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Marloes Peninsula, Wales, NRW Evidence Report No: 155, 23pp, Natural Resources Wales, Bangor.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
2017-07-31
Perchennog
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
  Swansea University, Dept. of Biosciences
Singleton Park, Swansea, Abertawe Swansea, SA2 8PP., Wales
http://www.swansea.ac.uk/biosci/#accept
 

Rhychwant

Rhychwant

Hyd
Pembrokeshire (45)
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Dosbarthiad

Fformat - Math a Disgrifiad
  • Delimited ()

    Math

    Project 478 Temporal trends and phenology in grey seals pup counts - Pembrokeshire (Skomer & Marloes), 2017 Media 1555 Data Outputs for two related reports: NRW Evidence Report 155: [A] Report in PDF Format - held in the DMS in NRW Evidence report area; [B] years and total counts in Microsoft Excel spread-sheet format .XLS - Marloes Peninsula census data.XLSX (EVID-307-372); [C] R script in proprietary format but may be opened as .TXT file - phenology basic analysis marloes.R (EDIV-307-371); NRW Evidence Report 217 [A] Report in PDF Format - held in the DMS in NRW Evidence report area; [B] years and total counts in Microsoft Excel spread-sheet format .XLS - Data_Skomer.XLS (EVID-307-375) and metadata Data_Skomer_Notes.XLS (EVID-307-377); [C] Daily births data in .CSV format - Skomer_daily_births.csv (EVID-307-376); [D] R script in proprietary format but may be opened as .TXT file - skomer analysis.R (EVID-307-373);

 

Ansawdd

Ansawdd Data

Cwmpas Ansawdd
Dataset
Cydymffurfiad
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
Eglurhad
Gradd
false
Datganiad

Trained staff have conducted over 30 annual surveys from 1983-2015 of grey seal pupping sites. Individual records were kept of each pup’s progress from birth to moult following a standardized protocol. Details included a unique numerical pup identifier, the location (beach name) and date of first observation, and a qualitative assessment of the developmental stage (1-5) of the pup. Sites were visited once a week and pups marked with a unique pattern to help monitor each individual. Records were maintained in field note books and transferred to recording sheets and Excel spread-sheets. Annual reports have been produced, from which the data in this study have been collated. Using R, spatially aggregated counts of pup numbers were analysed and trends in population abundances were quantified by fitting a Generalised Additive Model to the time series of annual pup counts.
 

Allweddeiriau

Allweddair

GEMET - INSPIRE themes, version 1.0
Math
Theme

Dyfyniad

Dyddiad (Cyhoeddiad)
2008-06-01
Cod
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair

NRW Thesaurus
  • grey seals
  • halichoerus grypus
  • phenology
  • Skomer (Skomer Island)
  • Marloes Peninsula
  • Pembrokeshire (county pre 1974)( county since 4/96)
Math
Theme

Dyfyniad

Dyddiad (Cyhoeddiad)
2023-12-31
Cod
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair

SeaDataNet Parameter Discovery Vocabulary
  • Seal abundance
Math
Theme

Dyfyniad

Dyddiad (Adolygu)
2021-01-06
Cod
geonetwork.thesaurus.external.theme.rdf+xml

Allweddair

NRW SMNR Vocabulary
  • Animals, Plants and Other Organisms (SMNR)
  • Natural Resources (incl. Features and Processes) (SMNR)
  • Ecosystem (SMNR)
  • Coastal Margins (SMNR)
  • Sustainable Management of Natural Resources (SMNR)
  • Sea and Coast (SMNR)
  • Marine (SMNR)
  • Management Areas (SMNR)
Math
Theme

Dyfyniad

Dyddiad (Adolygu)
2023-12-27
Cod
geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords
 

System Cyfeirio Gofodol

Cod
British National Grid (EPSG::27700)
 

Cynnwys

Gwybodaeth Cynnwys

Proffil CNC

Elfennau CNC

Teitlau cysylltiedig CNC

Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Skomer Wales
Teitlau cysylltiedig CNC

Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Marloes Peninsula Wales
 

Cyfyngiadau

Cyfyngiadau

Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus

Math o Gyfyngiad
Other restrictions
 

Cyfarwyddeb Cyfyngiadau Mynediad

Cyfyngiadau
no limitations
 

Testun cyfyngiadau mynediad

Cyfyngiadau eraill

There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
 

Defnyddiwch gyfyngiadau

Cyfyngiadau Defnyddio
Other restrictions
Cyfyngiadau eraill

© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
4f4c4942-4343-5764-6473-313139313239 XML
Laith Metadata
English
Math o adnodd
Dataset
Dyddiad Metadata
2024-05-31T09:39:07.399Z
Enw Safonol Metadata
NRW
Fersiwn Metadata

1.0

Pwynt Cyswllt
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Corff Cyhoeddi

Mynediad i'r Porth