Unobtrusive methodology to obtain estimates of colony size of the double-crested cormorant Phalacrocorax auritus breeding on Pokeshaw Rock, Chaleur Bay, New Brunswick, 2006 / Colin M. MacKinnon ; Andrew...: CW69-5/492E-PDF

"Pokeshaw Rock (470 47' N 65015' W) is an inaccessible "sea stack" located along the south shore of Chaleur Bay about 20 km west of the town of Caraquet, New Brunswick, Canada. The Double-crested Cormorant Phalacrocorax auritus colony appears to have developed sometime after 1928; being first recorded in 1966. Seven surveys and/or estimates conducted from 1966 to 2006 have reported from 100 to 619 nests (mean 358, S.D. 219). The cormorant colony situated at the top of Pokeshaw Rock was remotely surveyed using an unobtrusive methodology on 6 June 2006. The maximum number of nests of Double-crested Cormorant in the colony was 577 (95% CI, range from 246 to 874). The ratio of observed adult birds versus nests (on both the long and narrow axis of the island) were both significantly correlated (R2 = 0.853, n=ll, P<0.01 and R2= 0.696, n=ll, P<0.01 respectively). This unobtrusive census methodology provides both a safe and cost effective way to survey highly visible but inaccessible seabird colonies"--Abstract, p. i.

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