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Journal Article

An open‐population hierarchical distance sampling model

Rahel Sollmann; Beth Gardner; Richard B. Chandler; J. Andrew Royle; T. Scott Sillett
Ecology · Vol. 96, Issue 2 · pp. 325-331 · 2015

Abstract

Modeling population dynamics while accounting for imperfect detection is essential to monitoring programs. Distance sampling allows estimating population size while accounting for imperfect detection, but existing methods do not allow for estimation of demographic parameters. We develop a model that uses temporal correlation in abundance arising from underlying population dynamics to estimate demographic parameters from repeated distance sampling surveys. Using a simulation study motivated by designing a monitoring program for Island Scrub‐Jays ( Aphelocoma insularis ), we investigated the power of this model to detect population trends. We generated temporally autocorrelated abundance and distance sampling data over six surveys, using population rates of change of 0.95 and 0.90. We fit the data generating Markovian model and a mis‐specified model with a log‐linear time effect on abundance, and derived post hoc trend estimates from a model estimating abundance for each survey separately. We performed these analyses for varying numbers of survey points. Power to detect population changes was consistently greater under the Markov model than under the alternatives, particularly for reduced numbers of survey points. The model can readily be extended to more complex demographic processes than considered in our simulations. This novel framework can be widely adopted for wildlife population monitoring.

Bibliographic Information

JournalEcology
PublisherWiley
Publication Date2015-02-01
Publication Year2015
Volume96
Issue2
Pages325-331
Document TypeJournal Article
Print ISSN0012-9658
eISSN1939-9170
DOI10.1890/14-1625.1
SubjectEcology & Organismal Biology

Access Information

NARA Access Coverage1997-01-01~Current
Journal Homepagehttps://esajournals.onlinelibrary.wiley.com/loi/19399170
Publisher PageOpen Publisher Page
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