The Annals of Applied Statistics

Point process models for spatio-temporal distance sampling data from a large-scale survey of blue whales

Yuan Yuan, Fabian E. Bachl, Finn Lindgren, David L. Borchers, Janine B. Illian, Stephen T. Buckland, Håvard Rue, and Tim Gerrodette

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Abstract

Distance sampling is a widely used method for estimating wildlife population abundance. The fact that conventional distance sampling methods are partly design-based constrains the spatial resolution at which animal density can be estimated using these methods. Estimates are usually obtained at survey stratum level. For an endangered species such as the blue whale, it is desirable to estimate density and abundance at a finer spatial scale than stratum. Temporal variation in the spatial structure is also important. We formulate the process generating distance sampling data as a thinned spatial point process and propose model-based inference using a spatial log-Gaussian Cox process. The method adopts a flexible stochastic partial differential equation (SPDE) approach to model spatial structure in density that is not accounted for by explanatory variables, and integrated nested Laplace approximation (INLA) for Bayesian inference. It allows simultaneous fitting of detection and density models and permits prediction of density at an arbitrarily fine scale. We estimate blue whale density in the Eastern Tropical Pacific Ocean from thirteen shipboard surveys conducted over 22 years. We find that higher blue whale density is associated with colder sea surface temperatures in space, and although there is some positive association between density and mean annual temperature, our estimates are consistent with no trend in density across years. Our analysis also indicates that there is substantial spatially structured variation in density that is not explained by available covariates.

Article information

Source
Ann. Appl. Stat. Volume 11, Number 4 (2017), 2270-2297.

Dates
Received: September 2016
Revised: June 2017
First available in Project Euclid: 28 December 2017

Permanent link to this document
https://projecteuclid.org/euclid.aoas/1514430286

Digital Object Identifier
doi:10.1214/17-AOAS1078

Keywords
Distance sampling spatio-temporal modeling stochastic partial differential equations INLA spatial point process

Citation

Yuan, Yuan; Bachl, Fabian E.; Lindgren, Finn; Borchers, David L.; Illian, Janine B.; Buckland, Stephen T.; Rue, Håvard; Gerrodette, Tim. Point process models for spatio-temporal distance sampling data from a large-scale survey of blue whales. Ann. Appl. Stat. 11 (2017), no. 4, 2270--2297. doi:10.1214/17-AOAS1078. https://projecteuclid.org/euclid.aoas/1514430286


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Supplemental materials

  • Theory and analysis details. Supplement A gives theory for Sections 3.3 and 4.2. Supplement B gives details for the analysis in Section 5.