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Spatially explicit estimation of fish length histograms, with application to anchovy habitats in the Bay of Biscay ArchiMer
Petitgas, Pierre; Doray, Mathieu; Masse, Jacques; Grellier, Patrick.
Fish length frequency histograms from research surveys are of prime importance for identifying habitats of different life stages, as well as for stock assessment. However, no method has thus far been available for mapping these histograms as spatially varying curves. Here, a procedure is applied to map spatially connected curves, and detail is given on how it can be applied to map the length frequency histograms. At each sample location, a fish length frequency histogram is given as a vector of non-independent values. The histogram is first modelled as a polynomial expansion on the basis of orthogonal polynomials. Then, the polynomial coefficients are mapped by co-kriging, after fitting a model of co-regionalization. The length frequency map is finally...
Tipo: Text Palavras-chave: Co-kriging; European anchovy; Fish length; Functional kriging; Habitat; Mapping curves.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00049/16042/13581.pdf
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