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
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS119129
- Teitl Amgen
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- 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
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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
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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
Ystod amser
- Dyddiad cychwyn
- 1983-01-01
- Dyddiad gorffen
- 2015-12-31
- Categori pwnc
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- Biota
Rhychwant
Rhychwant
- Hyd
- Pembrokeshire (45)
))
Dosbarthiad
- Fformat - Math a Disgrifiad
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Delimited
()
- Math
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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);
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Delimited
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
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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
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
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- 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
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
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- Seal abundance
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
Allweddair
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NRW SMNR Vocabulary
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- 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
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
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Temporal trends and phenology in grey seal (Halichoerus grypus) pup counts at Skomer Wales
- Teitlau cysylltiedig CNC
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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
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There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
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© 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
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1.0