Commit 50cce655 authored by Lebot Clément's avatar Lebot Clément
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Final commit (add read me file)

parent 132aa436
# Adult abundance
## Abstract
Estimation of abundance with wide spatio-temporal coverage is essential to the assessment and management of wild populations. But, in many cases, data available to estimate abundance time series have diverse forms, variable quality over space and time and they stem from multiple data collection procedures. We developed a Hierarchical Bayesian Modelling (HBM) approach that take full advantage of the diverse assemblage of data at hand to estimate homogeneous time series of abundances. We apply our approach to the estimation of adult abundances of 18 Atlantic salmon populations of Brittany (France) from 1987 to 2017 using catch statistics, environmental covariates, fishing effort and abundance indices. Additional data of total or partial abundance collected in 4 more closely monitored populations are also integrated into the analysis. The HBM framework allows the transfer of information from the closely monitored populations to the others. Our results show a general pattern of abundance stability over the period studied. The apparent contradiction with the general claim of an overall decline of Atlantic salmon abundance at the scale of the species distribution range is discussed.
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