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Type: Journal article
Title: Using integrated land- and boat-based surveys to inform conservation of the Critically Endangered Balearic shearwater
Author: Jones, A.
Wynn, R.
Yésou, P.
Thébault, L.
Collins, P.
Suberg, L.
Lewis, K.
Brereton, T.
Citation: Endangered Species Research, 2014; 25(1):1-18
Publisher: Inter Research
Issue Date: 2014
ISSN: 1863-5407
Statement of
Alice R. Jones, Russell B. Wynn, Pierre Yésou, Laurent Thébault, Philip Collins, Lavinia Suberg, Kate M. Lewis, Tom M. Brereton
Abstract: We investigated spatio-temporal distribution patterns of the Critically Endangered Balearic shearwater Puffinus mauretanicus in the northern part of its migratory range, using a combination of effort-corrected land- and boat-based survey data (2007-2010). The species was recorded regularly along the western English Channel (Western Channel) coasts of northwest France and the southwest UK, with peak counts occurring during the summer and autumn months. Foraging aggregations comprising hundreds to thousands of birds (~1 to 20% of the global population) were recorded in the large shallow embayments of northern Brittany in all survey years. Elsewhere, most birds were recorded on passage, with maximum birds-per-hour (BPH) of 169 off northwest France and 36 off the southwest UK. Few birds were recorded offshore, beyond sight of land. A distance-from-shore analysis revealed that the species passed closer to shore than other pelagic seabirds such as sooty shearwater Puffinus griseus. A constant-effort seasonal survey from the southwest tip of the UK mainland recorded the species on 93% of survey days, with BPH rates peaking in the morning between 08:00 and 11:00 h. These results have important monitoring and conservation implications for this Critically Endangered species. In particular, the records of large aggregations in spatially restricted areas of the Western Channel during the inter-breeding period suggests the species could be vulnerable to impacts such as oil spills, or disturbance from offshore construction projects. We also provide evidence that some birds remain in the survey area during the breeding season, suggesting it may be an important site for non-breeding birds.
Keywords: Balearic shearwater; Puffinus mauretanicus; Spatio-temporal distribution; Visual monitoring; Critically Endangered; Western Channel; Conservation
Rights: © The authors 2014. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are un - restricted. Authors and original publication must be credited.
DOI: 10.3354/esr00611
Appears in Collections:Aurora harvest 2
Earth and Environmental Sciences publications

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