Field observations on the disturbance of grey seals in North Wales
Many studies quantify the impacts of non-lethal human disturbance on animal behaviour to which animals respond by deploying what are interpreted as anti-predator strategies. These strategies are recognised as diverting time and energy from behaviours that would have occurred in the absence of human influences. In this report, levels of disturbance to grey seals are measured and these take into account the variety of seal vigilance levels as the prelude to / trigger of gross disturbance. Gross disturbance here denotes the stampeding of a seal or seals into the sea, where they were assembled on land, or where seals 'crash dive' when already in the sea. The purposes of this data capture were to: - Record the haul-out patterns of grey seals at Henllwyn Bay on Ynys Enlli/Bardsey when subject to no disturbance caused by people, in order to show examples of normal behaviour. To record examples of disturbance caused by human activity on land, in the sea and in boats, at Henllwyn for comparison with 'normal' / undisturbed behaviour. - Describe variables in seal behaviour observed over several tide cycles. - Outline some aspects of survey design to best measure disturbance. - Outline some site-specific management measures designed to reduce the frequency of disturbance events while also respecting the desires of people to have good views of and insights into the behaviour of grey seals at haul-out sites. - Provide a short review of papers and reports on seal disturbance at haul-out sites on the shores of the northeast Atlantic. This will examine management measures that have been or are about to be deployed elsewhere and the ways that such measures are being, or will be, monitored.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS110019
- Teitl Amgen
-
- Arsylwadau maes ar aflonyddu ar forloi llwyd yng Ngogledd Cymru
- Laith Metadata
- English
- Datganiad
-
The natural pattern of grey seal emergence from and return to the sea at Henllwyn, Ynys Enlli/Bardsey was recorded at intervals of 15 minutes through the tide cycle, in order to understand 'natural' behaviour. Incidental notes were made describing seal behaviour and its apparent relationship to disturbance and relaxation. A count of seals in the sea adjacent to the haul-out sites was made at the same time. Simultaneously, instances of human activity at or near the site were recorded at the same interval. The time of arrival and the duration of time stayed at moorings in the bay by boats were recorded. Records were made of wind direction, wind speed and sea state, in order to discover to what extent they might influence site choice around the bay. At Henllwyn events from which gross disturbance resulted were recorded at the time they happened. Some of these events were filmed using a camcorder.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2005-05-31
Ystod amser
- Dyddiad cychwyn
- 2003-07-27
- Dyddiad gorffen
- 2003-08-04
- Categori pwnc
-
- Biota
Rhychwant
Rhychwant
- Hyd
- Caernarvonshire (49)
))
Maint Fertigol
- Maint allweddair MEDIN
-
water column skin; benthic boundary layer
Dosbarthiad
- Fformat - Math a Disgrifiad
-
-
Documents
()
- Math
-
Report with footage from Mini DV Video Cassette
-
Documents
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
The natural pattern of grey seal emergence from and return to the sea at Henllwyn, Ynys Enlli/Bardsey was recorded at intervals of 15 minutes through the tide cycle, in order to understand 'natural' behaviour. Incidental notes were made describing seal behaviour and its apparent relationship to disturbance and relaxation. A count of seals in the sea adjacent to the haul-out sites was made at the same time. Simultaneously, instances of human activity at or near the site were recorded at the same interval. The time of arrival and the duration of time stayed at moorings in the bay by boats were recorded. Records were made of wind direction, wind speed and sea state, in order to discover to what extent they might influence site choice around the bay. At Henllwyn events from which gross disturbance resulted were recorded at the time they happened. Some of these events were filmed using a camcorder.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
-
- marine and freshwater inventory
- grey seals
- halichoerus grypus
- disturbance
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
-
- Seal behaviour
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
-
Field observations on the disturbance of grey seals in North Wales 2003
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
- 4f4c4942-4343-5764-6473-313130303139 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-05-31T09:39:04.558Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0