Disentangling the complexity of tropical small-scale fisheries dynamics using supervised Self-Organizing Maps

PloS One
Manuel Mendoza-CarranzaLeopold A J Nagelkerke

Abstract

Tropical small-scale fisheries are typical for providing complex multivariate data, due to their diversity in fishing techniques and highly diverse species composition. In this paper we used for the first time a supervised Self-Organizing Map (xyf-SOM), to recognize and understand the internal heterogeneity of a tropical marine small-scale fishery, using as model the fishery fleet of San Pedro port, Tabasco, Mexico. We used multivariate data from commercial logbooks, including the following four factors: fish species (47), gear types (bottom longline, vertical line+shark longline and vertical line), season (cold, warm), and inter-annual variation (2007-2012). The size of the xyf-SOM, a fundamental characteristic to improve its predictive quality, was optimized for the minimum distance between objects and the maximum prediction rate. The xyf-SOM successfully classified individual fishing trips in relation to the four factors included in the model. Prediction percentages were high (80-100%) for bottom longline and vertical line + shark longline, but lower prediction values were obtained for vertical line (51-74%) fishery. A confusion matrix indicated that classification errors occurred within the same fishing gear. Prediction rat...Continue Reading

References

Feb 17, 2005·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·J F Caddy, J C Seijo
May 11, 2007·Ecological Applications : a Publication of the Ecological Society of America·Sophie BertrandFrançois Gerlotto
Jun 20, 2008·Environmental Monitoring and Assessment·Silke CramLeopoldo Galicia
Nov 19, 2010·Nature·Trevor A BranchSean R Tracey
Oct 17, 2012·Neural Networks : the Official Journal of the International Neural Network Society·Teuvo Kohonen
Aug 30, 2014·The Science of the Total Environment·Vladica M SimićDjuradj Milošević

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Methods Mentioned

BETA
GAM

Software Mentioned

Kohonen R
R
xfy
SOM
package “
beanplot ”
Kohonen package for R
xyf

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