PMID: 18213960Jan 25, 2008Paper

Understanding abundance patterns of a declining seabird: implications for monitoring

Ecological Applications : a Publication of the Ecological Society of America
Michelle L KisslingStephen B Lewis

Abstract

The Kittlitz's Murrelet (Brachyramphus brevirostris) is a rare, non-colonial seabird often associated with tidewater glaciers and a recent candidate for listing under the Endangered Species Act. We estimated abundance of Kittlitz's Murrelets across space and time from at-sea surveys along the coast of Alaska (USA) and then used these data to develop spatial models to describe abundance patterns and identify environmental factors affecting abundance. Over a five-week period in the summer of 2005, we recorded 794 Kittlitz's Murrelets, 16 Marbled Murrelets (B. marmoratus), and 70 unidentified murrelets. The overall population estimate (N, mean +/- SE) during the peak period (3-9 July) was 1317 +/- 294 birds, decreasing to 68 +/- 37 by the last survey period (31 July-6 August). Density of Kittlitz's Murrelets was highest in pelagic waters of Taan Fjord (18.6 +/- 7.8 birds/km2, mean +/- SE) during 10-16 July. Spatial models identified consistent "hotspots" of Kittlitz's Murrelets, including several small areas where high densities of murrelets were found throughout the survey period. Of the explanatory variables that we evaluated, tidal current strength influenced murrelet abundance most consistently, with higher abundance associate...Continue Reading

References

Jul 20, 2002·Science·Anthony A ArendtVirginia B Valentine

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Citations

Jan 10, 2014·Conservation Biology : the Journal of the Society for Conservation Biology·Joel BergerSteve Zack
Oct 19, 2016·Ecological Applications : a Publication of the Ecological Society of America·Holly F GoyertKathryn A Williams
Nov 20, 2019·Nature Ecology & Evolution·Sophie Cauvy-Fraunié, Olivier Dangles

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