Littorina littorea shell lengths from Strangford Lough, Northern Ireland

Date 2018
Temporal extent 2004 -2006
Author(s) Johnson MarkORCID1, McDermott Tommy2
Affiliation(s) 1 : Ryan Institute and School of Natural Sciences, National University of Ireland Galway, University Road, Galway, Ireland
2 : Trex Ecology, Leader View, 36 East High Street, Lauder, Scotland
DOI 10.17882/57184
Publisher SEANOE
Keyword(s) winkle, periwinkle, hand gathering, survey

Littorina littorea (L.) were collected from a number of shores around Strangford Lough in Northern Ireland between 2004 and 2006. The length of each shell (cm) was measured with callipers. The basic unit of survey was a vertical transect, approximately 30 m wide, covering the vertical range of L. littorea on the shore. A surveyed site may contain up to two separate transects. Snails were collected using 0.25 m2 quadrats thrown haphazardly on the shore. These were stratified in three horizontal bands, with 8 quadrats in each band. On some shores the lower shore was muddy and no littorinids were found. In these cases, data were only collected from the areas where L. littorea were found and fewer quadrats were thrown.

Length data are given for each transect in the file 'Shell lengths by transect'. Information on the associated shore, subsite code, year and number of quadrats thrown are in the 'Transect details' file.

Licence CC-BY
Acknowledgements TMcD was in receipt of ESF funding. The fieldwork was carried out while both authors were at Queen’s University Belfast. Sharon Doake and Danielle Cookson assisted with field and lab work.
File Size Format Processing Access
Littorina littorea shell lengths 109 KB CSV Raw data Open access
Information on transect location and year of sampling 1 KB CSV Raw data Open access
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How to cite 

Johnson Mark, McDermott Tommy (2018). Littorina littorea shell lengths from Strangford Lough, Northern Ireland. SEANOE.

In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :

Johnson Mark, McDermott Tommy (2018). Picking a way forward: valuing and managing traditional shellfish gathering for Littorina littorea. Submitted to Aquatic Living Resources