Status of Breeding Common Scoter Melanitta nigra nigra in Britain and Ireland in 1996: The Effect of the Sea Empress Oil Spill
Following concerns regarding potential effects of the Sea Empress oil spill in Carmarthen Bay, February 1996, on the British and Irish populations of breeding Common Scoters Melanitta nigra nigra, their status and distribution were determined from a survey in May - June 1996. The survey was undertaken in five areas (Shetland, the Flow country, West and South Scotland, Islay and Ireland), using methods devised during the first complete British and Irish census of this species in 1995. Survey effort was concentrated on sites that held Common Scoters in 1995, and on sites with historical records. The survey visited 223 sites and located 376 birds. This was 79 fewer birds than the previous year, a 17% decline in numbers (16% in Ireland and 19% in Britain), a 19% decrease in occupied 10-km squares and a 31% decrease in occupied sites, compared to visits made at a similar time in 1995. It is possible that a decline of this magnitude may be within the range of natural population fluctuations or it could be due to the late arrival of birds after the late spring in 1996. However, over the last eight years, the number of Common Scoters in the Flow country has declined by 42% from an estimated 48 pairs in 1988 to only 28 in 1996. Given the Common Scoter's threatened status in the UK, that the dynamics of the population are unknown, and the potential decline, annual monitoring of both numbers and productivity is a high priority. Data used to assess the potential effects of the Sea Empress oil spill in Carmarthen Bay, February 1996, on the British and Irish populations of breeding Common Scoters Melanitta nigra nigra.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS110113
- Teitl Amgen
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- Statws mor-hwyaid duon melanitta nigra nigra oedd yn nythu ym Mhrydain ac Iwerddon yn 1996: effaith gollyngiad olew'r Sea Empress
- Laith Metadata
- English
- Datganiad
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Sites on the Scottish mainland were surveyed from 12-18 May and Islay was surveyed on 7 June. In Ireland, Loughs Conn/Cullin, Corrib and Arrow were surveyed between 16-19 May, but surveys of Lough Ree were delayed until 22-25 May by poor weather. During each survey, all open water and the entire mainland and island shorelines were scanned for birds using binoculars or telescopes. Most observations were land based, but boat surveys were used on larger and complex sites. Clear, calm weather was selected for all field visits and observers recorded the number of birds present, classified into pairs (male and female in continuous close consort), single adult males, single immature males, unaged males, single females and unsexed birds. To minimise the risk of double counting birds, where possible, surveys were organised to cover adjacent sites simultaneously. In order to investigate whether there had been any decline in numbers between 1995 and 1996, the numbers of birds present per site were analysed using a generalised linear model with Poisson error distribution and log link function in the GLIM statistical package. Sites were selected for analysis if birds were present either during the 1996 survey, or during the comparable visit in 1995. Four explanatory variables were included in the model: sex, area, site, and year.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 1996-08-31
Rhychwant
Rhychwant
- Hyd
- Great Britain (GBN)
))
Maint Fertigol
- Maint allweddair MEDIN
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water column skin; bathypelagic water column
Dosbarthiad
- Fformat - Math a Disgrifiad
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Documents
()
- Math
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Report is held in Word and .pdf format
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Documents
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
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Sites on the Scottish mainland were surveyed from 12-18 May and Islay was surveyed on 7 June. In Ireland, Loughs Conn/Cullin, Corrib and Arrow were surveyed between 16-19 May, but surveys of Lough Ree were delayed until 22-25 May by poor weather. During each survey, all open water and the entire mainland and island shorelines were scanned for birds using binoculars or telescopes. Most observations were land based, but boat surveys were used on larger and complex sites. Clear, calm weather was selected for all field visits and observers recorded the number of birds present, classified into pairs (male and female in continuous close consort), single adult males, single immature males, unaged males, single females and unsexed birds. To minimise the risk of double counting birds, where possible, surveys were organised to cover adjacent sites simultaneously. In order to investigate whether there had been any decline in numbers between 1995 and 1996, the numbers of birds present per site were analysed using a generalised linear model with Poisson error distribution and log link function in the GLIM statistical package. Sites were selected for analysis if birds were present either during the 1996 survey, or during the comparable visit in 1995. Four explanatory variables were included in the model: sex, area, site, and year.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
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- breeding
- breeding birds
- common scoter (black scoter)
- melanitta nigra
- Carmarthen Bay
- distributions
- survey methods (survey techniques) (survey) (surveying)
- Shetland
- Flow country
- west Scotland
- South Scotland
- Islay
- endangered species (threatened species)(protected species)
- marine and freshwater inventory
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
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- Bird taxonomy-related abundance per unit area of surface
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
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The status of breeding common scoter melanitta nigra nigra in Britain and Ireland in 1996 : the effect of the Sea Empress oil spill
- Teitlau cysylltiedig CNC
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All Wales common scoter survey : report on 2001/02 work programme
- Teitlau cysylltiedig CNC
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All Wales common scoter survey : report on 2002/03 work programme
- Teitlau cysylltiedig CNC
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All Wales common scoter survey : report on 2003/2004 work programme
- Teitlau cysylltiedig CNC
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Common scoter Melanitta nigra monitoring in Carmarthen Bay following the Sea Empress oil spill
- Teitlau cysylltiedig CNC
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Common scoter monitoring in Carmarthen Bay following the Sea Empress oil spill. April 1997 to March 1998
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
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There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
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- 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
- 4f4c4942-4343-5764-6473-313130313133 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-05-31T09:41:08.808Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
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1.0