Data/hora: 27/07/2024 02:12:31

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Spatially explicit estimation of fish length histograms, with application to anchovy habitats in the Bay of Biscay	
Autores: 	Petitgas, Pierre; Doray, Mathieu; Masse, Jacques; Grellier, Patrick.	
Data: 	2011-11	
Ano: 	2011	
Palavras-chave: 	Co-kriging; European anchovy; Fish length; Functional kriging; Habitat; Mapping curves.	
Resumo: 	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 derived by linearly combining maps of polynomial coefficients. An estimation variance associated with the map is also derived. Maps of anchovy length distributions are produced by applying the method to midwater trawl length data from the PELGAS acoustic surveys in the Bay of Biscay. This novel approach extends the application of kriging techniques to curves or functions, opening new perspectives for mapping more complex information than just the values of fish density.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00049/16042/13581.pdf

DOI:10.1093/icesjms/fsr139	
Editor: 	Oxford Univ Press	
Relação: 	http://archimer.ifremer.fr/doc/00049/16042/	
Formato: 	application/pdf	
Fonte: 	Ices Journal Of Marine Science (1054-3139) (Oxford Univ Press), 2011-11 , Vol. 68 , N. 10 , P. 2086-2095	
Fonte: 	2011 International Council for the Exploration of the Sea. Published by Oxford University Press. All rights reserved.