Download or read book Ancient Murrelet (Synthliboramphus Antiquus). written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: COSEWIC Status Appraisal Summary on the Ancient Murrelet Synthliboramphus antiquus in Canada SPECIAL CONCERN 2014 COSEWIC status appraisal summaries are working documents used in assigning the status of wildlife species suspected of being at risk in Canada. [...] In 2011, sample burrows on the southern and central sections of Helegesen Island indicated an occupancy rate of 0.11 compared with 0.63 in 1986, a decline in the population estimate of ~90% (Gaston et al. [...] If the overall population estimate in 1986 reflected the population on Lihou at that time, then a decline in the breeding population on Lihou Island of ~50% occurred between 1986 and 2011. [...] A major blow-down of forest on several of the Laskeek Bay colony islands in the winter of 2010-11 reduced the amount of nesting habitat available to Ancient Murrelets (Gaston et al. [...] In the decade following the eradication of Norway Rats (Rattus norvegicus) on Langara Island in the mid-1990s, there was a rapid expansion in colony area, initially associated with a decrease in burrow density, and then a gradual increase in burrow occupancy (Bertram 1995, Taylor et al.