Keogan, K. et al

Diet, timing of egg laying and breeding success data for Isle of May European shag population 1985-2015

Data on timing of breeding, breeding success and diet of the European shag, sampled from the Isle of May population. The data were collected between 1985 and 2015 by visually checking nests and collecting regurgitated diet samples. These data are part of the Isle of May long-term study to assess population trends of seabirds under environmental change (IMLOTS

Publication date: 2020-10-14

Get the data

This dataset is available under the terms of the Open Government Licence

Format of the data: Comma-separated values (CSV)

You must cite: Keogan, K.; Lewis, S.; Howells, R.J.; Newell, M.A.; Harris, M.P.; Burthe, S.; Phillips, R.A.; Wanless, S.; Phillimore, A.B.; Daunt, F. (2020). Diet, timing of egg laying and breeding success data for Isle of May European shag population 1985-2015. NERC Environmental Information Data Centre.



Study area
Temporal extent
1985-01-01    to    2015-12-31

Provenance & quality

Breeding phenology and success were recorded for a sample of nests every year between 1987 and 2016 (no data available for 1993 and 2003). Nests were monitored in 18 plots spread throughout the colony. Nests were checked every seven days from before laying started until after the last chick had fledged.

Sea surface temperature data were extracted for February and March in each year (from for an area surrounding the Isle of May that overlapped shag foraging distribution in the breeding season.

Regurgitates (from which the biomass proportions of each prey type can be estimated) were collected during the chick-rearing period (April -July) between 1985 and 2014. Collection dates showed a strong positive correlation with the timing of the shag breeding season.

Correspondence/contact details

Dr. Francis Daunt
UK Centre for Ecology & Hydrology
Lancaster Environment Centre, Library Avenue, Bailrigg


Keogan, K.
Marine Scotland Science, University of Edinburgh
Lewis, S.
University of Edinburgh
Howells, R.J.
Marine Scotland Science
Newell, M.A.
UK Centre for Ecology & Hydrology
Harris, M.P.
UK Centre for Ecology & Hydrology
Burthe, S.
UK Centre for Ecology & Hydrology
Phillips, R.A.
British Antarctic Survey
Wanless, S.
UK Centre for Ecology & Hydrology
Phillimore, A.B.
University of Edinburgh
Daunt, F.
UK Centre for Ecology & Hydrology

Other contacts

NERC EDS Environmental Information Data Centre
NERC Environmental Information Data Centre

Additional metadata

Topic categories
Isle of May Phalacrocorax aristotelis Phenology
Environmental Monitoring Facilities
Spatial representation type
Tabular (text)
Spatial reference system
WGS 84
Last updated
25 June 2021 18:42