The Development and Use of a Method to Fill Time Gaps in Migration Counts

The condor

María Mateos-Rodríguez¹ 

关键词: bird-migration volume;    Calonectris diomedea;    migration counts;    migratory passage;    Morus bassanus;    parametric bootstrap;    Puffinus mauretanicus;    time gaps;   

DOI  :  10.1525/cond.2012.100053

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Abstract. In some conservation situations, there is a need for estimates of numbers of seabirds migrating past a specific site, such as sites of proposed offshore wind farms. Migration counts from points strategically located on the coast can be a reliable and effective method of reaching this goal. We propose a consistent and statistically robust method for estimating such numbers by generalized additive modeling of the numbers passing during periods when counts are interrupted. This procedure has the advantage of accounting for the effects of covariates, such as wind, on the counts in a flexible manner, potentially increasing accuracy and precision. We develop a reliable method of estimating precision, based on a parametric bootstrap, and applied a sensitivity analysis to our models to test their accuracy. We demonstrate the method with three species of seabirds migrating through the Strait of Gibraltar. Estimated numbers of the Northern Gannet (Morus bassanus) are similar to the estimated Atlantic popu...

【 授权许可】

CC BY