The need for year-specific correction factors (k values) when converting counts of individual common guillemots Uria aalge to breeding pairs

Harris, Mike P.; Heubeck, Martin; Newell, Mark A.; Wanless, Sarah

NORA

The need for year-specific correction factors (k values) when converting counts of individual common guillemots Uria aalge to breeding pairs

Harris, Mike P. ORCID: https://orcid.org/0000-0002-9559-5830; Heubeck, Martin; Newell, Mark A. ORCID: https://orcid.org/0000-0001-8875-2642; Wanless, Sarah ORCID: https://orcid.org/0000-0002-2788-4606. 2015 The need for year-specific correction factors (k values) when converting counts of individual common guillemots Uria aalge to breeding pairs. Bird Study, 62 (2). 276-279. 10.1080/00063657.2015.1017444

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Abstract

Long-term studies at two Scottish colonies show that the k value used to convert counts of individual Common Guillemots Uria aalge to pairs has changed substantially in the last 15 years due to decreases in survival and colony attendance. Any future wide-scale census of this species needs to collect concurrent k values if counts of individual birds are to be used to determine changes in breeding populations since the previous survey.

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